CN103516431B - Photoelectricity optical repeater, the long processing method away from box and its to upper and lower traveling optical signal - Google Patents

Abstract

The invention discloses a photoelectric optical repeater, a long-distance box and a method for processing the uplink and downlink optical signals. Optical repeater, photoelectric optical repeater reshape and re-amplify the upstream optical signal output by the 1:N coupler, and output it to the optical line terminal OLT; the optical amplifier amplifies the downstream optical signal and outputs it to the 1:N coupler 1: The N coupler divides the downlink optical signal output by the photoelectric optical repeater into N paths and outputs them to N optical splitters connected to itself. The photoelectric optical repeater and the optical amplifier respectively reshape and re-amplify the uplink and downlink signals and output them, prolonging the transmission distance of the optical signal; the insertion loss of the 1:N coupler is small, which makes the passive optical network PON larger Therefore, the long-distance box can increase the optical splitting ratio of the PON while ensuring the long-distance transmission of optical signals.

Description

Photoelectric optical repeater, long-distance box and processing method for uplink and downlink optical signals

technical field

The invention relates to the field of optical access technology, in particular to a photoelectric optical repeater, a long-distance box and a processing method for uplink and downlink optical signals.

Background technique

In the context of global informatization, broadband access is developing rapidly. The fiber-to-the-x (FTTx) construction model has greatly reduced the construction cost of broadband access networks, and realized the bandwidth increase of the access network at a lower cost. The development of FTTx has added a strong momentum.

With the advancement of FTTx network construction, operators are eager to reduce the cost of FTTx network construction and operation and maintenance. Large capacity and fewer offices are the development direction of future access networks.

Passive Optical Network (PON) technology is a point-to-multipoint optical fiber access technology. Commonly used time division multiplexing passive optical network (Time Division Multiplexing PON, TDM-PON) and time division wavelength division hybrid multiplexing passive optical network (Hybird PON, H-PON).

In TDM-PON, the system adopts a single wavelength for both uplink and downlink. For uplink optical signals, each user uses different time slots for transmission, and for downlink optical signals, broadcasting is used for transmission. Figure 1 is a schematic diagram of the existing TDM-PON structure, including: Optical Line Terminal (Optical Line Terminal, OLT), Optical Network Unit (Optical Network Unit, ONU), repeater (Mid-Span Extender) and splitter (splitter) .

Usually, an OLT is connected to multiple ONUs through a repeater and an optical splitter to form a point-to-multipoint structure. Figure 1 shows that four OLTs are connected to four optical splitters through four repeaters to form a 4 A schematic diagram of the optical distribution network (Optical Distribution Network, ODN).

In the schematic diagram of the TDM-PON structure shown in Figure 1, on the one hand, for the upstream optical signal, the power of the upstream optical signal transmitted by the ONU is specified within a certain range; on the other hand, the insertion loss of the optical splitter and its own The splitting ratio is directly proportional to the splitting ratio. The larger the splitting ratio, the greater the insertion loss. Therefore, this limits the transmission distance of the optical signal. If a large splitting ratio is to be achieved, the transmission distance of the optical signal will be shortened. To ensure the realization of For long-distance transmission of optical signals, the splitting ratio must be reduced. In the case of a small splitting ratio, a large number of PON ports need to be set for users with a large load. However, the number of PON ports in the OLT is limited. If you want to add a PON port, you need to add an OLT, and use the PON ports of the newly added OLT to establish a large number of ODNs. Adding new OLTs and establishing a large number of ODNs will increase network construction costs and operation and maintenance costs.

In addition, in the TDM-PON structure shown in FIG. 1 , the structure of the repeater is complex and difficult to implement.

In H-PON, the system uses light waves with different wavelengths to transmit optical signals, and each wavelength uses time-division multiplexing to transmit optical signals. Figure 2 is a schematic diagram of the composition and structure of the existing H-PON, including: hybrid optical line terminal (Hybrid OLT, H-OLT), repeater (Mid-Span Extender), hybrid optical network unit (Hybrid ONU, H-ONU) and beam splitters. Among them, the H-OLT connects a plurality of local PON ports for receiving and sending optical signals of different wavelengths through a local multiplexer/demultiplexer (at this time, it is called a plurality of said PON ports and one of the PON ports connected to them). The multiplexer/demultiplexer together constitute an H-PON port of the H-OLT) to communicate with the repeater. Problems similar to those of the TDM-PON structure also exist in the above-mentioned H-PON.

To sum up, in the current passive optical network technology, there is a problem that light splitting is relatively small if long-distance transmission of optical signals is to be ensured.

Contents of the invention

An embodiment of the present invention provides a photoelectric optical repeater, which is used to solve the problems of complex structure and difficult implementation of the repeater in the prior art.

A kind of photoelectric optical repeater, described photoelectric optical repeater comprises: optical network unit ONU transceiver and OLT receiver;

The OLT receiver is used to perform photoelectric conversion, re-amplification and reshaping of the received upstream optical signal to the ONU transceiver;

The ONU transceiver is used for converting the uplink electrical signal from the OLT receiver to output after electro-optical conversion.

The photoelectric optical repeater in the embodiment of the present invention is composed of an ONU transceiver and an OLT receiver. Since the functions of each transceiver are clearly divided, the structure is simple and easy to implement.

Embodiments of the present invention also provide a long-distance box and a processing method for uplink and downlink optical signals, which are used to solve the problem of relatively small light splitting in the case of ensuring long-distance transmission of optical signals in a PON.

A long-distance box, the long-distance box includes: a photoelectric optical repeater, a 1:N coupler, and an optical amplifier OA;

OA, used to amplify the downlink optical signal from the OLT and output it to the 1:N coupler;

The 1: N coupler is used to divide the downlink optical signal output by the OA into N paths, and output them to the N optical splitters connected to itself, and couple the uplink optical signals output by the connected optical splitters into one path Then output to the photoelectric optical repeater;

The photoelectric optical repeater is used to reshape and reamplify the uplink optical signal from the 1:N coupler, and output it to the OLT.

A method for processing an uplink optical signal using the long-distance box above, the method comprising:

1: When the N coupler receives the uplink optical signals from the optical splitters connected to it, it couples the uplink optical signals of each optical splitter into one and outputs it to the photoelectric optical repeater;

The photoelectric optical repeater re-shapes and re-amplifies the upstream optical signal output by the 1:N coupler, and outputs it to the OLT.

A method for processing downlink optical signals using the long-distance box above, the method comprising:

When the OA receives the downlink optical signal from the OLT, it amplifies the downlink optical signal and outputs it to the 1:N coupler;

1: The N coupler divides the downlink optical signal output by the optoelectronic optical repeater into N paths, and outputs them to N optical splitters connected to itself respectively.

A long-distance box, the long-distance box includes: n photoelectric optical repeaters, 1:N couplers, a first multiplexer/demultiplexer, a second multiplexer/demultiplexer, and an optical amplifier OA, The N is a positive integer greater than 1, and the n is a positive integer greater than 1;

The OA is used to amplify the downlink optical signal from the OLT and output it to the 1:N coupler;

The 1: N coupler is used to divide the downlink optical signal output by the OA into N paths, and output them to N optical splitters connected to itself, and couple the uplink optical signal output by each optical splitter into one path and then output to the second multiplexer/demultiplexer;

The second multiplexer/demultiplexer is used to decompose the uplink optical signal from the 1:N coupler into k channels of uplink optical signals, and output them to k optoelectronic optical repeaters, wherein the k channels In the upstream optical signals, the wavelengths of the light waves carrying each upstream optical signal are different from each other, and the k is a positive integer greater than 1 and less than or equal to n;

The photoelectric optical repeater is used to reshape and re-amplify the uplink optical signal from the second multiplexer/demultiplexer and output it to the first multiplexer/demultiplexer;

The first multiplexer/demultiplexer is used to combine k channels of upstream optical signals from the optoelectronic optical repeater into one upstream optical signal, and output it to the H-OLT.

A method for processing an uplink optical signal using the long-distance box above, the method comprising:

1: When the N coupler receives the uplink optical signals from the optical splitters connected to it, it couples the uplink optical signals of each optical splitter into one and outputs it to the second multiplexer/demultiplexer;

The second multiplexer/demultiplexer decomposes the upstream optical signal output by the 1:N coupler into k channels of upstream optical signals, and outputs them to k photoelectric optical repeaters respectively, wherein the k channels of upstream optical signals wherein, the wavelengths of the light waves carrying the uplink optical signals of each channel are different from each other, and the k is a positive integer greater than 1 and less than or equal to n;

The k photoelectric optical repeaters respectively reshape and re-amplify the uplink optical signals output by the second multiplexer/demultiplexer and then output them to the first multiplexer/demultiplexer;

The first multiplexer/demultiplexer combines the upstream optical signals output by the k optoelectronic optical repeaters into one upstream optical signal, and outputs it to the H-OLT.

A method for processing downlink optical signals using the long-distance box above, the method comprising:

When the OA receives the downlink optical signal from the H-OLT, it amplifies the downlink optical signal and outputs it to the 1:N coupler;

1: The N coupler divides the downlink optical signal output by the OA into N paths, and outputs them to the N optical splitters connected to itself respectively.

In the solution of the embodiment of the present invention, on the one hand, the photoelectric optical repeater in the long-distance box connected to a PON port of the OLT or the long-distance box connected to an H-PON port of the H-OLT performs the upstream optical signal Reshape and re-amplify, and output the reshaped and amplified uplink optical signal, the optical amplifier in the long-distance box amplifies the downlink optical signal, prolonging the transmission distance of the optical signal; on the other hand, the long-distance box The insertion loss of the 1:N coupler is small, which makes it possible to increase the splitting ratio in the PON. Therefore, the long-distance box in the present invention increases the optical signal in the PON while ensuring the long-distance transmission of optical signals. Split ratio.

Description of drawings

FIG. 1 is a schematic diagram of the composition and structure of PON in the background technology;

2 is a schematic diagram of the composition and structure of H-PON in the background technology;

3 is a schematic structural view of the photoelectric optical repeater in Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of timing signals output by a logic unit in Embodiment 1 of the present invention;

Fig. 5 is a schematic structural diagram of a long-distance box in Embodiment 2 of the present invention;

FIG. 6 is a schematic structural diagram of the connection between the 1:4 coupler 22 and the multimode fiber and the single-mode fiber in Embodiment 2 of the present invention;

FIG. 7 is a schematic structural diagram of a long-distance box applied to a GPON system in Embodiment 1 of the present invention;

Fig. 8 is a schematic structural diagram of a long-distance box in Embodiment 3 of the present invention;

Fig. 9 is a schematic structural diagram of a long-distance box in Embodiment 3 of the present invention;

Fig. 10 is a schematic structural diagram of a long-distance box in Embodiment 3 of the present invention;

Fig. 11 is a schematic structural diagram of a long-distance box in Embodiment 3 of the present invention;

12 is a schematic structural diagram of the first wavelength division multiplexing filter in Embodiment 3 of the present invention;

13 is a schematic structural diagram of a second wavelength division multiplexing filter in Embodiment 3 of the present invention;

Fig. 14 is a schematic structural diagram of a long-distance box in Embodiment 3 of the present invention;

Fig. 15 is a schematic structural diagram of a long-distance box in Embodiment 3 of the present invention;

Fig. 16 is a schematic structural diagram of a long-distance box in Embodiment 4 of the present invention;

Fig. 17 is a schematic structural diagram of a long-distance box in Embodiment 4 of the present invention;

Fig. 18 is a schematic structural diagram of a long-distance box in Embodiment 4 of the present invention;

Fig. 19 is a schematic structural diagram of a long-distance box in Embodiment 4 of the present invention;

FIG. 20 is a schematic diagram of a method for processing an uplink optical signal in Embodiment 5 of the present invention;

FIG. 21 is a schematic diagram of a method for processing a downlink optical signal in Embodiment 6 of the present invention;

FIG. 22 is a schematic diagram of a method for processing an uplink optical signal in Embodiment 7 of the present invention;

FIG. 23 is a schematic diagram of a method for processing a downlink optical signal in Embodiment 8 of the present invention.

Detailed ways

N in the 1:N coupler of the embodiment of the present invention is a positive integer greater than 1, and the value of N can be determined according to actual needs. In the solution of the embodiment of the present invention, 4 is taken as an example for illustration.

The solution of the present invention will be described in detail below through specific examples.

Embodiment one

As shown in FIG. 3 , it is a schematic structural diagram of an optoelectronic optical repeater 23 in Embodiment 1 of the present invention. The optoelectronic optical repeater 23 includes: an ONU transceiver 31 and an OLT receiver 32 .

The OLT receiver 32 is used to perform photoelectric conversion, re-amplification and reshaping of the received upstream optical signal to the ONU transceiver;

The uplink optical signal received by the OLT receiver 32 may be from a 1:N coupler, and the converted downlink optical signal may be output to the 1:N coupler.

The ONU transceiver 31 is used for converting the uplink electrical signal from the OLT receiver to electro-optic conversion and then outputting it.

Preferably, considering that the ONU transceiver 31 in the photoelectric optical repeater 23 needs to turn off its transmitting switch when not transmitting an upstream optical signal, and stop the operation for the upstream optical signal, so as to avoid crosstalk of other optical signals, Ensure the normal operation of the photoelectric optical repeater; and when the OLT receiver 32 finishes receiving the upstream optical signal this time, keep the reset state in time, so as to process the upstream optical signal input into it next time. The repeater also includes: a logic unit 33;

The OLT receiver 32 is also configured to output a detection signal to the logic unit 33, and the detection signal is output by the OLT receiver according to the strength and duration of the input upstream optical signal. The detection signal may be: a signal detection (Signal Detect, SD) signal or a signal loss (Lost of Signal, LOS) signal. When the detection signal is an SD signal, the detection signal is valid when the OLT receiver receives the upstream optical signal, as High level; when the detection signal is a LOS signal, the detection signal is valid when the OLT receiver does not receive the upstream optical signal, and is low level;

The logic unit 33 is used to instruct the ONU transceiver 31 and the OLT receiver 32 to stop performing operations on the upstream optical signal when the received detection signal is an SD signal and the detection signal is invalid, and when the received detection signal is an SD signal and When the detection signal is valid, instruct the ONU transceiver 31 and the OLT receiver 32 to perform operations on the upstream optical signal; when the received detection signal is a LOS signal and the detection signal is valid, the ONU transceiver 31 and the OLT receiver 32 are instructed to stop performing operations on the upstream optical signal. The operation of the upstream optical signal, when the received detection signal is a LOS signal and the detection signal is invalid, instructs the ONU transceiver and the OLT receiver to perform operations on the upstream optical signal.

Preferably, in order to further process the uplink optical signal so that the signal quality of the uplink optical signal output from the optoelectronic optical repeater is better, the optoelectronic optical repeater 23 also includes a clock recovery unit 34 and a retiming unit 35;

The ONU transceiver 31 is also used to output the downlink electrical signal obtained after the received downlink optical signal is photoelectrically converted to the clock recovery unit 34;

The clock recovery unit 34 is used to receive the downlink electrical signal output by the ONU transceiver, and extract a reference clock from the downlink electrical signal, and output the reference clock to the retiming unit 35;

The retiming unit 35 is configured to receive the uplink electrical signal output by the OLT 32 receiver and the reference clock output by the clock recovery unit, use the reference clock to retime the uplink electrical signal, and retime the uplink electrical signal after retiming The electrical signal is output to the ONU transceiver 31 .

Preferably, the logic unit 33 is also used to instruct the retiming unit to reset the local register when the received detection signal is valid, or to instruct the retiming unit to reset the local register when the received detection signal is invalid , so that the retiming unit 35 clears its own register, and performs retiming for the next received uplink electrical signal.

Specifically, after receiving the detection signal output by the OLT receiver, the logic unit 33 outputs the following timing signals to instruct corresponding devices or units in the optoelectronic optical repeater to operate on the upstream optical signal. Here, the detection signal is taken as an SD signal as an example for description.

reset2 is a reset signal output by the logic unit to the OLT receiver. When SD is invalid, it instructs the OLT receiver to stop the operation on the upstream optical signal, and when SD is valid, it instructs the OLT receiver to perform operations on the upstream optical signal;

reset1 is a reset signal output by the logic unit to the retiming unit, and when SD is valid, it instructs the retiming unit to reset the local register;

Tx_burst is a switch control signal output by the logic unit to the ONU transceiver. When SD is valid, the OLT receiver performs an operation on the upstream optical signal.

Assuming that the upstream optical signal OLT Optical received by the OLT receiver is as shown in Figure 4 (Guard Time in Figure 4 indicates that no upstream signal is input to the OLT receiver during this time period), the OLT receiver receives the optical signal according to the input The intensity and duration of the optical signal are output to the SD to the logic unit, and the process of reset2, reset1 and Tx_burst output by the logic unit based on the SD is as follows:

[1] At time t1, there is an upstream optical signal input to the OLT receiver, and after a time delay of t _delay1 , the OLT outputs a high level to the logic unit (the SD signal in Figure 4 is at a high level to indicate that there is an upstream optical signal input);

[2], the logic unit detects that the SD signal is at a high level, and after a delay of t _delay6 , it outputs a high level to the ONU transceiver at t2 (Tx_burst in Figure 4 is at a high level at this time), indicating the ONU transceiver Turn on the transmit switch to perform operations on uplink optical signals.

[3], the logic unit detects that the SD signal is at a high level, and after a delay of t _delay4 , it outputs a low level to the OLT receiver at t3 (reset2 in Figure 4 is at a low level at this time), indicating the OLT receiver Cancel the reset and perform the operation for the upstream optical signal.

[4] After time t3, the logic unit outputs a reset signal to the retiming unit at t4 after time delay t _delay5 (reset1 in Fig. 4 is high level at this time), instructing the retiming unit to reset, and the retiming unit The local register is cleared to start retiming operation for the incoming up electrical signal.

[5] At time t5, no upstream optical signal is input to the OLT receiver, and the OLT receiver outputs a low level to the logic unit at time t6 after a delay of t _delay2 (the SD signal in Figure 4 is at a low level at this time).

[6], the logic unit detects that the SD signal is low and maintains a certain width Tth (the Tth can be configured through the register of the logic unit), after a delay of t _delay6 , it outputs a low level to the ONU transceiver at t7 (Tx_burst in Figure 4 is at low level at this time), instructing the ONU transceiver to turn off the transmission switch and stop the operation on the upstream optical signal.

[7], the logic unit detects that the SD signal is low level, after a time delay of t _delay3 , it outputs a high level to the OLT receiver at t8 (reset2 in Figure 4 is high level at this time), indicating the OLT receiver Reset, stop the operation on the upstream optical signal, and keep the reset state.

The above t _delay1 and t _delay2 can be configured through the registers of the OLT receiver, and t _delay3 , t _delay4 , t _delay5 and t _delay6 can be configured through the registers of the logic unit. The above-mentioned reset1 and reset2 displays are active at high level, of course, they can also be configured as active at low level.

The photoelectric optical repeater in the first embodiment of the present invention is composed of an ONU transceiver and an OLT receiver. Since the functions of the two are clearly divided, the structure is simple and easy to implement.

Through the solution of Embodiment 1 of the present invention, the photoelectric optical repeater realizes the reshaping, re-amplification and retiming of the upstream optical signal, so that the quality of the upstream optical signal output to the OLT or H-OLT is better, and the optical fiber communication is improved. reliability, because the optoelectronic optical repeater in the first embodiment of the present invention can reshape, re-amplify and retime the uplink light, therefore, the optoelectronic optical repeater in the embodiment of the present invention can extend the distance of the optical signal Transmission distance.

Embodiment two

As shown in FIG. 5 , it is a schematic structural diagram of the long-distance box in Embodiment 2 of the present invention. The long-distance box includes: an optical amplifier (Optical Amplifier, OA) 21, a 1:4 coupler 22, and an optoelectronic optical repeater 23, of which:

The OA 21 is used to amplify the downlink optical signal from the OLT and output it to the 1:N coupler 22;

The 1:4 coupler 22 is used to divide the downlink optical signal output by the OA into N paths, and output them to the N optical splitters connected to itself, and couple the uplink optical signals output by the optical splitters connected to it Output to the photoelectric optical repeater 23 after being one way;

The optoelectronic optical repeater 23 is used to reshape and reamplify the uplink optical signal from the 1:4 coupler 22, and output it to the OLT.

Preferably, in order to reduce the insertion loss of the uplink optical signal passing through the 1:4 coupler 22, the photoelectric optical repeater 23 and the 1:4 coupler 22 are connected through a multi-mode fiber (Multi-Mode Fiber, MMF).

Since the 1:4 coupler 22 has the asymmetry of the optical signal loss, that is, the loss of the optical signal is related to the traveling direction of the optical signal through itself, when the optical signal is coupled from a single-mode fiber (Single Mode Fiber, SMF) through 1:4 Transmitter 22 to multimode fiber, the loss of optical signal is 1dB; And when optical signal is transmitted to single mode fiber through 1:4 coupler 22 from multimode fiber, the loss of optical signal is 10lg(1/4)dB, so , in the embodiment of the present invention, the photoelectric optical repeater 23 and the 1:4 coupler 22 are connected through a multi-mode fiber (Multi-Mode Fiber, MMF), and the loss of the downlink optical signal can be paired with the downlink optical signal through the OA 21 The signal amplification factor is increased to compensate.

Specifically, a schematic diagram of the structure of the 1:4 coupler 22 connected to a multimode fiber and a single-mode fiber is shown in Figure 6, wherein the multimode fiber is connected to the multimode port of the 1:4 coupler 22, and the single-mode fiber is connected to the multimode port of the 1:4 coupler 22. The single-mode port of the 1:4 coupler 22 is connected.

When the 4 upstream optical signals are transmitted to the 1:4 coupler through multiple single-mode optical fibers, the 1:4 coupler uses the aggregation mechanism (such as: lens, fusion pulling method) to combine the 4 upstream optical signals into one output for multimode fiber.

Preferably, the long-distance box further includes: a splitter 24 and a local management unit 25;

The splitter 24 is used to divide the downlink optical signal from the OLT into two paths, one path is output to the local management unit 25, the other path is output to the OA 21, and the upstream optical signal output by the photoelectric optical repeater 23 The optical signal is forwarded to the OLT.

The local management unit 25 is configured to perform parameter configuration on the optoelectronic optical repeater 23 and the OA21 according to the received downlink optical signal, and report local parameter information to the OLT.

Specifically, the photoelectric optical repeater 23 includes: an ONU transceiver 31 and an OLT receiver 32;

The ONU transceiver 31 is configured to perform electro-optical conversion on the upstream electrical signal from the OLT receiver 32 and output it to the shunt 24;

The OLT receiver 32 is used to perform photoelectric conversion, re-amplification and reshaping on the upstream optical signal from the 1:4 coupler, and then output it to the ONU transceiver.

Specifically, the local management unit 25 receives the downlink optical signal from the OLT that includes the parameter configuration information of the photoelectric optical repeater 23 and the OA 21, and uses the parameter configuration information to pass through the ONU Management and Control Interface (ONU Management and Control Interface, OMCI) channel configures, manages and maintains the photoelectric optical repeater 23 for the power of the transmitted optical signal, the power of the received optical signal and its operating voltage and bias current, and the OMCI channel is a local The channel between the management unit and the opto-optical repeater.

It should be noted that the local management unit in the second embodiment receives the downlink optical signal from the splitter 24 to configure the parameters of the photoelectric optical repeater 23. At this time, the configuration information is from the The output of the PON port, but the local management unit in the solution of the second embodiment is not limited to receiving the downlink optical signal from the PON port connected to the long-distance box to which it belongs, and can also receive the downlink optical signal from other PON ports of the OLT The parameter configuration information in the signal is used to realize the parameter configuration, management and maintenance of the photoelectric optical repeater.

The long-distance box in Embodiment 2 of the present invention is applied to a Time Division Multiplexer (Time Division Multiplexer) PON system, for example: Ethernet PON (Ethernet Passive Optical Networks, EPON) system, Gigabit-capable Passive Optical Networks (Gigabit-capable Passive Optical Networks, GPON) system, 10G PON (10G-PON) system, XG-PON system, in different systems, the photoelectric optical repeater in the long-distance box of the present invention can be configured according to the requirements of each system, to suit the corresponding system.

In the solution of Embodiment 2 of the present invention, on the one hand, the photoelectric optical repeater in the long-distance box reshaped and re-amplified the uplink optical signal, and the optical amplifier in the long-distance box re-amplified the downlink optical signal , the transmission distance of the optical signal is extended. On the other hand, since the insertion loss of the 1:N coupler to the upstream optical signal is small, the light splitting ratio in the TDM-PON can be increased by using the long-distance box in the embodiment of the present invention. Therefore, it can be realized that the long-distance transmission of the optical signal is ensured, and the optical splitting ratio is increased, so that a small number of PON ports can be used to load more users.

Fig. 7 shows a schematic diagram of the structure of the long-distance box in the second embodiment of the present invention applied to the GPON system. In Fig. 7, the long-distance box contains a 1:4 coupler as an example. Through the long-distance box of the present invention, the background The four ODNs in the technology are all established under one PON port of the OLT of GPON, which realizes a large splitting ratio, can connect more ONUs, that is, serves more users, and improves the efficiency of ODN establishment by the PON port of the OLT.

Embodiment three

Considering that the ONU transceiver 31 in the photoelectric optical repeater needs to turn off its transmission switch when not transmitting the upstream optical signal, stop the operation for the upstream optical signal, so as to avoid the crosstalk of other optical signals and ensure the optical relay The normal operation of the device; and when the OLT receiver 32 finishes receiving the upstream optical signal this time, it will keep the reset state in time, so as to process the upstream optical signal input into it next time. The third embodiment of the present invention is based on the second embodiment On this basis, the structure of the long-distance box is further optimized, and its schematic diagram is shown in Figure 8.

The photoelectric optical repeater 23 also includes: a logic unit 33;

The OLT receiver 32 is also used to output a detection signal to the logic unit. When the detection signal is an SD signal, the detection signal is valid when the OLT receiver 32 receives the upstream optical signal output by the 1:N coupler, and is high Level, when the detection signal is a LOS signal, the detection signal is valid when the OLT receiver 32 does not receive the upstream optical signal output by the 1:N coupler, and is low level;

The logic unit 33 is used to instruct the ONU transceiver 31 and the OLT receiver 32 to stop performing operations on the upstream optical signal when the received detection signal is an SD signal and the detection signal is invalid, and when the received detection signal is an SD signal and When the detection signal is valid, instruct the ONU transceiver 31 and the OLT receiver 32 to perform operations on the upstream optical signal; when the received detection signal is a LOS signal and the detection signal is valid, the ONU transceiver 31 and the OLT receiver 32 are instructed to stop performing operations on the upstream optical signal. For the operation of the upstream optical signal, when the received detection signal is a LOS signal and the detection signal is invalid, instruct the ONU transceiver 31 and the OLT receiver 32 to perform operations on the upstream optical signal.

Preferably, in order to realize that the long-distance box has a retiming function for the uplink optical signal, so that the quality of the uplink optical signal output by the long-distance box is better, Embodiment 3 of the present invention provides three kinds of long-distance boxes, and their structural diagrams are respectively As shown in FIG. 9 , FIG. 10 and FIG. 11 , the basic idea is to extract the reference clock from the downlink optical signal, and use the extracted reference clock to retime the uplink signal. The three structures of the long-distance box will be described below with reference to FIG. 9 , FIG. 10 and FIG. 11 .

The first structure:

As shown in Figure 9, the long-distance box also includes: an optical splitter 26 and a first optical dual signal device 27; the ONU transceiver 31 includes an uplink optical signal transmitting port and a downlink optical signal receiving port; Repeater 23 also includes: clock recovery unit 34 and retiming unit 35, wherein:

The optical splitter 26 is used to divide the downstream optical signal output by the splitter 25 into two paths, and output one path to the first optical dual signal device 27, and output the other path to the OA 21, and receive signals from the first optical dual signal path. the upstream optical signal of the signal device 27, and output it to the splitter 25;

The first optical dual signal device 27 is used to identify the received optical signal. When receiving the upstream optical signal output from the upstream optical signal transmitting port of the ONU transceiver 31, it is output to the optical splitter 26. When the downlink optical signal from the optical splitter 26 is output to the downlink optical signal receiving port of the ONU transceiver 31;

The ONU transceiver 31 is also used to receive the downlink optical signal output by the first optical dual signal device 27, and convert the downlink optical signal into a downlink electrical signal and output it to the clock recovery unit 34;

The clock recovery unit 34 is configured to extract a reference clock from the received downlink electrical signal, and output the reference clock to the retiming unit 35;

The retiming unit 35 is configured to receive the uplink electrical signal output by the OLT receiver 32, use the received reference clock to retime the uplink electrical signal, and output the retimed uplink electrical signal to the ONU transceiver 31.

The second structure:

As shown in Figure 10, the long-distance box also includes: an optical splitter 26 and a first optical dual-channel device 27, and the ONU transceiver 31 includes an uplink optical signal transmitting port and a downlink optical signal receiving port. Repeater 23 also includes: clock recovery unit 34 and retiming unit 35;

The first optical dual signal device 27 is used to identify the received optical signal. When receiving the upstream optical signal output from the upstream optical signal transmitting port of the ONU transceiver, it is output to the splitter 24. output the downstream optical signal of the splitter 24 to the optical splitter 26;

The optical splitter 26 is used to divide the downstream optical signal output by the first optical dual signal device 27 into two paths, and output one path to the downstream optical signal receiving port of the ONU transceiver 31, and output the other path to the OA 21;

The ONU transceiver 31 is also used to receive the downstream optical signal output by the optical splitter 26, and convert the downstream optical signal into a downstream electrical signal and output it to the clock recovery unit 34;

The clock recovery unit 34 is configured to extract a reference clock from the received downlink electrical signal, and output the reference clock to the retiming unit 35;

The retiming unit 35 is configured to receive the uplink electrical signal output by the OLT receiver 32, use the received reference clock to retime the uplink electrical signal, and output the retimed uplink electrical signal to the ONU transceiver 31.

In Figure 9 and Figure 10, the devices inside the long-distance box are the same, but the connection relationship has changed.

The third structure:

As shown in Figure 11, the long-distance box also includes: an embedded optical network terminal (Embedded Optical NetworkTerminal, EONT) 29 and a first optical dual signal device 27; the photoelectric optical repeater 23 also includes: a retiming unit 35;

The first optical dual signal device 27 is used to separate the received optical signal. When receiving the upstream optical signal output from the ONU transceiver 31, the upstream optical signal is output to the splitter 24. output the downstream optical signal to the optical amplifier 21;

The EONT 29 is used to convert the downstream optical signal output from the splitter 24 into a downstream electrical signal, extract a reference clock from the downstream electrical signal, output the reference clock to the retiming unit, and output the downstream electrical signal to the local Management unit 25;

The retiming unit 35 is used to receive the uplink electrical signal output by the OLT receiver 32, use the reference clock output by the EONT 29 to retime the uplink electrical signal, and output the retimed uplink electrical signal to the ONU for transceiver Device 31.

Preferably, in the above three structures, in order to enable the long-distance box to accurately retime the different uplink optical signals, the logic unit 33 is also used to instruct the retiming when the received detection signal is valid. The timing unit 35 resets the local registers, or, when the received detection signal is invalid, instructs the retiming unit 35 to reset the local registers, that is, the local registers are cleared to zero, which is the retiming of the upstream electrical signal output by the OLT receiver 32 prepare.

Preferably, in the above-mentioned three structures, the long-distance box further includes: a second optical doubler 28, which is used to separate the received optical signal and receive the uplink optical signal from the 1:N coupler 22 output the uplink optical signal to the OLT receiver 32 , and output the downlink optical signal to the 1:4 coupler 22 when receiving the downlink optical signal output from the OA21 .

Preferably, the first optical dualizer 27 is a wavelength division multiplexing filter or an optical circulator, and the second optical dualizer 28 is a wavelength division multiplexing filter or an optical circulator.

When the first optical dual signal device 27 is a wavelength division multiplexing filter, its structure is as shown in Figure 12;

When the second optical dual signal device 28 is a wavelength division multiplexing filter, its structure is as shown in Figure 13;

R shown in Figure 12 and Figure 13 is the reflection port of the WDM filter, P is the transmission port of the WDM filter, and C is the common port of the WDM filter. The filter uses the sideband filter to separate the optical signal input from the common port C, and when the wavelength of the input optical signal is smaller than the sideband wavelength of the sideband filter, it is output from the P port; when the wavelength of the input optical signal is When it is larger than the sideband wavelength of the sideband filter, it is output from the R port.

The sideband wavelength of the sideband filter can be determined according to the wavelength range of the uplink optical signal, for example: suppose the wavelength range of the uplink optical signal is 1260 nanometers (nm)~1360nm, and the wavelength range of the downlink optical signal is 1480~1550nm , the sideband wavelength is greater than 1360nm and less than 1480nm, for example, 1450nm may be used.

When the first optical dual signal device 27 and the second optical dual signal device 28 are all wavelength division multiplexing filters, record the first optical dual signal device as the first wavelength division multiplexing filter, and the second optical dual signal device The filter is the second wavelength division multiplexing filter, and the structure diagram of the long distance box is shown in Figure 14.

In Fig. 14, the reflection port R of the first wavelength division multiplexing filter is connected with the upstream optical signal transmission port of the ONU transceiver 31 through a single-mode fiber, the common port C is connected with the splitter 24 through a single-mode fiber, and the transmission port P Connect to the optical splitter 26 through a single-mode optical fiber;

The reflection port R of the second wavelength division multiplexing filter is connected with the optical amplifier 21 through a single-mode fiber, the common port C is connected with the 1:4 coupler 22 through a multimode fiber, and the transmission port P is connected with the OLT receiver 32 through a multimode fiber connected;

When the first optical dual signal device 27 and the second optical dual signal device 28 are both optical circulators, record the first optical dual signal device as the first optical circulator, and the second optical dual signal device as the optical circulator, The schematic diagram of the structure of the long-distance box is shown in Figure 15.

The optical circulator has three ports, namely port 1, port 2 and port 3, (indicated by 1, 2 and 3 in Figure 15), port 1 is the input port of the optical signal, and port 2 is the input/output port of the optical signal , port 3 is the output port of the optical signal, the transmission path of the optical signal can only be from port 1 to port 2, or from port 2 to port 3, other transmission paths are prohibited.

In Fig. 15, the port 1 of the first optical circulator is connected with the uplink optical signal transmitting port of the ONU transceiver 31 through a single-mode fiber, the port 2 is connected with the splitter 24 through a single-mode fiber, and the port 3 is connected with the splitter 24 through a single-mode fiber Device 26 is connected;

Port 1 of the second optical circulator is connected with optical amplifier 21 by single-mode fiber, port 2 is connected with 1:4 coupler 22 by multimode fiber, and port 3 is connected with OLT receiver 32 by multimode fiber;

Since the insertion loss of the optical signal from the single-mode fiber to the multi-mode fiber is small, and the insertion loss from the multi-mode fiber to the single-mode fiber is relatively large, the above-mentioned uplink and downlink optical signals in the wavelength division multiplexing filter or optical circulator During the transmission process, the downlink optical signal enters the reflection port R to the common port C (or from port 1 to port 2) through the single-mode fiber, and the insertion loss is small; the uplink optical signal passes from the common port C to the transmission port connected to the multimode fiber Port P (or from port 2 to port 3) also has less insertion loss.

The above-mentioned long-distance box structure in Figure 14 is obtained by replacing the first dual-channel filter with the first wavelength-division multiplexing filter and replacing the second dual-channel filter with the second wavelength-division multiplexing filter on the basis of Figure 10 , the long-distance box structure in Figure 15 is obtained by replacing the first dual-channel device with the first optical circulator and the second dual-channel device with the second optical circulator on the basis of Figure 10, Figure 9 and Figure 11 The above replacement can also be performed, and will not be repeated here.

The photoelectric optical repeater in the above three structures of the long-distance box can be the photoelectric optical repeater in Embodiment 1, that is to say, the logic unit outputs a timing signal after receiving the detection signal output by the OLT receiver It is the same as the timing signal output by the logic unit in Embodiment 1, and will not be repeated here.

Through the solution of Embodiment 3 of the present invention, the photoelectric optical repeater in the long-distance box realizes the reshaping, re-amplification and retiming of the uplink optical signal, so that the quality of the uplink optical signal output to the OLT is better, and the long-distance box The optical amplifier in the optical amplifier realizes the amplification of the downlink optical signal and improves the reliability of the optical fiber communication. Since the long-distance box in Embodiment 3 of the present invention can reshape, reamplify and retime the uplink light, as well as adjust the downlink optical signal Therefore, the long-distance box in the embodiment of the present invention can shorten the transmission distance of the optical signal, which allows the long-distance box in the embodiment of the present invention to be placed far away from the OLT.

Embodiment Four

Considering that in the existing passive optical network system, in order to increase the bandwidth of the user, the wavelength division multiplexing technology and the time division multiplexing technology are combined and applied in the passive optical network system at the same time. At this time, this kind of system is called wavelength division multiplexing. Time-division multiplexing passive optical network system. At this time, the optical line terminal in the system is a hybrid optical line terminal (Hybird OLT, H-OLT), and the corresponding ONU is also a hybrid ONU (Hybird ONU, H-ONU). To improve the light splitting ratio under long-distance transmission in such a system, Embodiment 4 of the present invention provides a long-distance box, whose structure is shown in Figure 16. The long-distance box includes: a first multiplexing/demultiplexing device 20, a second multiplexer/demultiplexer 29, an optical amplifier OA 21, a 1:4 coupler 22, and n photoelectric optical repeaters 23, where n is a positive integer greater than 1;

The OA 21 is used to amplify the downlink optical signal from the optical line terminal OLT and output it to the 1:N coupler 22;

The 1:4 coupler 22 is used to divide the downlink optical signal output by the OA into 4 paths, and output them to the 4 optical splitters connected to itself, and couple the uplink optical signals output by each optical splitter into one path. Output to the second multiplexer/demultiplexer 29;

The second multiplexer/demultiplexer 29 is used to decompose the uplink optical signal from the 1:4 coupler 22 into k channels of uplink optical signals, and output them to k photoelectric optical repeaters 23, wherein the Among the k channels of upstream optical signals, the wavelengths of the light waves carrying the upstream optical signals of each channel are different from each other, and the k is a positive integer greater than 1 and less than or equal to n;

The photoelectric optical repeater 23 is used to reshape and re-amplify the uplink optical signal from the second multiplexer/demultiplexer 29 and output it to the first multiplexer/demultiplexer 20;

The first multiplexer/demultiplexer 20 is configured to combine the k-channel upstream optical signals from the optoelectronic optical repeater 23 into one upstream optical signal, and output it to the H-OLT.

Preferably, for the insertion loss of the uplink optical signal through the 1:4 coupler 22, the OA 21 is connected to the 1:N coupler 22 through a multimode optical fiber;

Preferably, the wavelength of the optical wave preset in the photoelectric optical repeater 23 for carrying the uplink optical signal and the uplink optical signal sent by the second multiplexer/demultiplexer 29 are used for carrying the uplink optical signal. The light waves of the signal have the same wavelength;

The second multiplexer/demultiplexer 29 is specifically configured to decompose the uplink optical signal from the 1:4 coupler 22 into k channels of uplink optical signals, and respectively according to the wavelengths of the light waves carrying the uplink optical signals of each channel, Output the k-channel uplink optical signals to the wavelength-matched optoelectronic optical repeater 23 respectively.

Preferably, in order to facilitate the configuration, management and maintenance of the long-distance box by the H-OLT, the long-distance box further includes: a splitter 24 and a local management unit 25;

The splitter 24 is used to divide the downlink optical signal from the H-OLT into two paths, one path is output to the local management unit 25, and the other path is output to the OA 21, and the first multiplex/demultiplex The uplink optical signal output by the device 20 is forwarded to the H-OLT;

The local management unit 25 is configured to perform parameter configuration on the optoelectronic optical repeater and OA according to the received downlink optical signal, and report local parameter information to the OLT.

Preferably, the photoelectric optical repeater 23 includes: an ONU transceiver 31 and an OLT receiver 32;

The OLT receiver 32 is used to perform photoelectric conversion, re-amplification and reshaping of the upstream optical signal from the second multiplexer/demultiplexer, and output it to the ONU transceiver in the photoelectric optical repeater where it is located;

The ONU transceiver 31 is configured to perform electrical-optical conversion on the uplink electrical signal from the OLT receiver and output it to the first multiplexer/demultiplexer.

Preferably, the photoelectric optical repeater further includes: a logic unit 33;

The OLT receiver 32 is also used to output a detection signal to the logic unit. When the detection signal is an SD signal, the detection signal is valid when the OLT receiver receives the upstream optical signal output by the second multiplexer/demultiplexer, is high level, when the detection signal is a LOS signal, the detection signal is valid when the OLT receiver does not receive the upstream optical signal output by the second multiplexer/demultiplexer, and is low level;

The logic unit 33 is used to instruct the ONU transceiver and the OLT receiver to stop performing operations on the upstream optical signal when the received detection signal is an SD signal and the detection signal is invalid, and when the received detection signal is an SD signal and the detection signal When valid, instruct the ONU transceiver and OLT receiver to perform operations on upstream optical signals; when the received detection signal is a LOS signal and the detection signal is valid, instruct the ONU transceiver and OLT receiver to stop performing operations on upstream optical signals, When the received detection signal is a LOS signal and the detection signal is invalid, instruct the ONU transceiver and the OLT receiver to perform operations on the upstream optical signal.

Preferably, in order to realize the retiming of the upstream optical signal, the structure of the above-mentioned long-distance box is further optimized. Here, three structures of the long-distance box are introduced, all of which can realize the retiming of the upstream optical signal. At this time, These three different long-distance box structures are shown in Figure 17, Figure 18 and Figure 19 respectively, and the structure of the long-distance box will be described below with reference to Figure 17, Figure 18 and Figure 19 respectively.

For the long-distance box in Fig. 17, in addition to including the first multiplexer/demultiplexer 20, the second multiplexer/demultiplexer 29, the 1:4 coupler 22, the optical amplifier OA 21, n photoelectric optical In addition to the repeater 23, the shunt 24 and the local management unit 25, it also includes an optical splitter 26 and n first optical dual-channel devices 27, wherein the n first optical dual-channel devices 27 and the n photoelectric optical One-to-one correspondence between relays 23; the ONU transceiver 31 includes an uplink optical signal transmitting port and a downlink optical signal receiving port;

The optical splitter 26 is used to divide the downstream optical signal output by the splitter 24 into two paths, and output one path to the first multiplexer/demultiplexer 20, and output the other path to the OA 21, and receive signals from the second an upstream optical signal of the multiplexer/demultiplexer 20, and output it to the splitter 24;

The first optical dual signal device 27 is used to separate the received optical signal. When receiving the upstream optical signal output from the upstream optical signal transmission port of the ONU transceiver 31 in the photoelectric optical repeater corresponding to itself, Output it to the first multiplexer/demultiplexer, when receiving the downstream optical signal from the first multiplexer/demultiplexer, output it to the downstream optical signal receiving port of the ONU transceiver 31;

The photoelectric optical repeater also includes: a clock recovery unit 34 and a retiming unit 35;

The ONU transceiver 31 is also used to receive the downlink optical signal output by the first optical dual signal device corresponding to the photoelectric optical repeater where it is located, and convert the downlink optical signal into a downlink electrical signal and output it to the ONU where it is located. Clock recovery unit 34 in the photoelectric optical repeater;

The clock recovery unit 34 is configured to extract a reference clock from the received downlink electrical signal, and output the reference clock to the retiming unit in the optoelectronic optical repeater where it is located;

The retiming unit 35 is used to receive the uplink electrical signal output by the OLT receiver 32 in the optoelectronic optical repeater where it is located, use the received reference clock to retime the uplink electrical signal, and retiming The final uplink electrical signal is output to the ONU transceiver 31 in the photoelectric optical repeater where it is located.

For the long-distance box in Fig. 18, in addition to including the first multiplexer/demultiplexer 20, the second multiplexer/demultiplexer 29, the 1:4 coupler 22, the optical amplifier OA 21, n photoelectric optical In addition to the repeater 23, the splitter 24 and the local management unit 25, it also includes: an optical splitter 26, a first optical dual signal device 27 and a third multiplexing/demultiplexing device 30; the ONU transceiver includes an upstream optical signal Transmitting port and downlink optical signal receiving port;

The first optical dualizer 27 is used to separate the received optical signal, and when receiving the uplink optical signal output from the uplink optical signal transmitting port of the first multiplexer/demultiplexer 20, the uplink The optical signal is output to the splitter 24, and when receiving the downstream optical signal from the splitter, the downstream optical signal is output to the optical splitter 26;

The optical splitter 26 is used to divide the downlink optical signal output by the first optical dual signal device into two paths, and output one path to the third multiplexer/demultiplexer 30, and output the other path to the OA 21;

The third multiplexer/demultiplexer 30 is used to decompose the downlink optical signal from the optical splitter into m downlink optical signals, which are respectively output to the downlink of the ONU transceiver 31 in the m photoelectric optical repeaters 23 An optical signal receiving port, wherein, among the m downlink optical signals, the wavelengths of the light waves carrying each downlink optical signal are different from each other, and the m is a positive integer greater than 1 and less than or equal to n;

The photoelectric optical repeater also includes: a clock recovery unit 34 and a retiming unit 35;

The ONU transceiver 31 is also used to receive the downlink optical signal output by the third multiplexer/demultiplexer 30, and convert the downlink optical signal into a downlink electrical signal and output it to the photoelectric optical repeater 23 where it is located The clock recovery unit 34;

The clock recovery unit 34 is configured to extract a reference clock from the received downlink electrical signal, and output the reference clock to the retiming unit 34 in the optoelectronic optical repeater 23 where it is located;

The retiming unit 34 is used to receive the uplink electrical signal output by the OLT receiver 32 in the photoelectric optical repeater 23 where it is located, and retime the uplink electrical signal by using the received reference clock, and retime the uplink electrical signal. The timed uplink electrical signal is output to the ONU transceiver 31 in the optoelectronic optical repeater where it is located.

Preferably, the wavelength of the light wave preset in the photoelectric optical repeater for carrying the downlink optical signal is the same as the wavelength of the downlink optical signal sent by the third multiplexer/demultiplexer 30, used for carrying the downlink optical signal The light waves have the same wavelength;

The third multiplexer/demultiplexer 30 is specifically configured to decompose the downlink optical signal from the optical splitter into m downlink optical signals, and divide the The m channels of downlink optical signals are respectively output to the wavelength-matched optoelectronic optical repeaters.

For the long-distance box in Fig. 19, in addition to including the first multiplexer/demultiplexer 20, the second multiplexer/demultiplexer 29, the 1:4 coupler 22, the optical amplifier OA 21, n photoelectric optical In addition to the repeater 23, the splitter 24 and the local management unit 25, it also includes: a first optical dual signal device 27, a third multiplexer/demultiplexer 30 and n embedded optical network terminals EONT 36, the n The EONT 36 is in one-to-one correspondence with the n optoelectronic repeaters 23, and the optoelectronic repeater also includes: a retiming unit 35, wherein:

The first optical dualizer 27 is used to separate the received optical signal, and when receiving the upstream optical signal output from the first multiplexer/demultiplexer 20, output the upstream optical signal to H- The OLT, when receiving the downlink optical signal from the H-OLT, outputs the downlink optical signal to the splitter 24;

The splitter 24 is used to divide the downlink optical signal output by the first optical dual signalizer 27 into two paths, one path is output to the third multiplexer/demultiplexer 30 , and the other path is output to the optical amplifier 21 .

The third multiplexer/demultiplexer 30 is configured to decompose the downstream optical signal output by the splitter 24 into m channels of downstream optical signals and output them to m EONTs 36 respectively, wherein the m channels of downstream optical signals , the wavelengths of the light waves carrying each downlink optical signal are different from each other, and the m is a positive integer greater than 1 and less than or equal to n;

The EONT 36 is used to convert the received downlink optical signal into a downlink electrical signal, extract a reference clock from the downlink electrical signal, output the reference clock to the retiming unit in the corresponding photoelectric optical repeater, and The downlink electrical signal is output to the local management unit;

The retiming unit 35 is configured to receive the uplink electrical signal output by the OLT receiver in the optoelectronic optical repeater where it is located, use the reference clock output by the EONT 36 to retime the uplink electrical signal, and The retimed uplink electrical signal is output to the ONU transceiver 31 in the optoelectronic optical repeater where it is located.

Preferably, the wavelength of the light wave preset in the opto-optical repeater 23 for carrying the downlink optical signal is the same as the wavelength of the light wave preset in the corresponding EONT 36 for carrying the downlink optical signal, The wavelength of the optical wave used to carry the downlink optical signal preset in the EONT is the same as the wavelength of the light wave used to carry the downlink optical signal in the downlink optical signal sent by the third multiplexer/demultiplexer 30;

The third multiplexer/demultiplexer 30 is specifically configured to decompose the downlink optical signal output by the splitter 24 into m downlink optical signals, and divide the The m channels of downlink optical signals are respectively output to the wavelength-matched EONT 36 .

Preferably, the logic unit 33 in the photoelectric optical repeater is also used to instruct the retiming unit to reset its own register when the received detection signal is valid, or, when the received detection signal is invalid, Instructs the retiming unit to reset its own registers.

Preferably, the long-distance box also includes:

The second optical dualizer 28 is used to separate the received optical signal, and when receiving the uplink optical signal from the 1:N coupler, output the uplink optical signal to the second multiplexer/demultiplexer 29 . When receiving the downlink optical signal from the OA 21 , output the downlink optical signal to the 1:N coupler 22 .

Preferably, the second optical duplexer and the second multiplexer/demultiplexer are connected through a multimode optical fiber, and the second multiplexer/demultiplexer is connected to the n photoelectric optical repeaters through connected by multimode fiber.

Preferably, the first optical dualizer 27 is a wavelength division multiplexing filter or an optical circulator; the second optical dualizer 28 is a wavelength division multiplexing filter or an optical circulator.

Preferably, the long-distance box is applied in a passive optical network system with wavelength division and time division multiplexing.

Embodiment five

Based on the long-distance box of the above-mentioned Embodiment 2 and Embodiment 3, Embodiment 5 of the present invention proposes a method for processing uplink optical signals, as shown in Figure 20, the method includes:

Step 101: 1: When the N coupler receives the uplink optical signal of each optical splitter, it couples the uplink optical signal of each optical splitter into one and outputs it to the optoelectronic optical repeater.

Step 102: the opto-optical repeater performs reshaping and re-amplification on the uplink optical signal output by the 1:N coupler, and outputs it to the OLT.

Preferably, after the photoelectric optical repeater performs reshaping and re-amplification on the uplink optical signal output by the 1:N coupler, the method further includes:

The splitter receives the reshaped and amplified upstream optical signal, and outputs it to the OLT;

Preferably, the photoelectric optical repeater performs reshaping and re-amplification on the uplink optical signal output by the 1:N coupler as follows:

The OLT receiver performs photoelectric conversion, re-amplification and reshaping on the upstream optical signal from the 1:N coupler, and then outputs it to the ONU transceiver;

The ONU transceiver performs electrical-optical conversion on the upstream electrical signal from the OLT receiver and then outputs it to the OLT.

Preferably, the optoelectronic optical repeater performs reshaping, reamplification and retiming on the uplink optical signal output by the 1:N coupler, and outputs it to the OLT.

For the specific implementation manner of retiming the uplink optical signal by the optoelectronic optical repeater, please refer to Embodiment 1 and Embodiment 2, which will not be repeated here.

Embodiment six

Based on the long-distance box in Embodiment 2 and Embodiment 3 above, Embodiment 6 of the present invention proposes a method for processing downlink optical signals, as shown in Figure 21. The method includes:

Step 201: When the OA receives the downlink optical signal from the optical line terminal OLT, amplifies the downlink optical signal and outputs it to the 1:N coupler;

Step 202: 1: The N coupler divides the downlink optical signal output by the optoelectronic repeater into N paths, and outputs them to N optical splitters connected to itself respectively.

Preferably, before the photoelectric optical repeater reshapes and reamplifies the received downlink optical signal, the method further includes:

The splitter divides the downlink optical signal from the OLT into two paths, one path is output to the local management unit, and the other path is output to the OA;

The local management unit configures the parameters of the photoelectric optical repeater according to the received downlink optical signal.

Embodiment seven

Based on the long-distance box in Embodiment 4 above, Embodiment 7 of the present invention proposes a method for processing downlink optical signals, as shown in FIG. 22 , including the following steps:

Step 301: 1: When the N coupler receives the uplink optical signals from the optical splitters connected to it, it couples the uplink optical signals of each optical splitter into one and outputs it to the second multiplexer/demultiplexer;

Step 302: The second multiplexer/demultiplexer decomposes the uplink optical signal output by the 1:N coupler into k channels of uplink optical signals, and outputs them to k optoelectronic optical repeaters respectively, wherein the k channels In the upstream optical signals, the wavelengths of the light waves carrying each upstream optical signal are different from each other, and the k is a positive integer greater than 1 and less than or equal to n;

Step 303: k photoelectric optical repeaters respectively reshape and re-amplify the uplink optical signal output by the second multiplexer/demultiplexer and then output it to the first multiplexer/demultiplexer;

Step 304: The first multiplexer/demultiplexer combines the upstream optical signals output by the k optoelectronic optical repeaters into one upstream optical signal, and outputs it to the H-OLT.

Embodiment Eight

Based on the long-distance box in Embodiment 4 above, Embodiment 6 of the present invention proposes a method for processing downlink optical signals, as shown in FIG. 23 , including the following steps:

Step 401: When the OA receives the downlink optical signal from the H-OLT, it amplifies the downlink optical signal and outputs it to the 1:N coupler;

Step 402: 1: The N coupler divides the downlink optical signal output by the OA into N paths, and outputs them respectively to N optical splitters connected to itself.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (18)

1. a kind of photoelectricity optical repeater, which is characterized in that the photoelectricity optical repeater includes：Optical network unit ONU transceiver and Optical line terminal OLT receiver；

The OLT receivers, for output after the uplink optical signal of reception is carried out opto-electronic conversion and amplifies reshaping again to ONU Transceiver；

The ONU transceiver, for being exported after carrying out electro-optic conversion from the uplink electrical signals of OLT receivers；

Wherein, the photoelectricity optical repeater further includes：Clock recovery unit and again timing unit；The ONU transceiver, is additionally operable to Receive third multiplexing demultiplexing device output downlink optical signal, and by the downlink optical signal be converted to downstream electrical signals export to The clock recovery unit in photoelectricity optical repeater where itself, the clock recovery unit, for from the downlink electrical received Reference clock is extracted in signal, and the reference clock is exported to the timing list again into the photoelectricity optical repeater where itself Member；The timing unit again, the uplink telecommunications for receiving the OLT receivers output in the photoelectricity optical repeater where itself Number, timing again is carried out to the uplink electrical signals using the reference clock received, and the uplink electrical signals after timing again are defeated Go out to the ONU transceiver in the photoelectricity optical repeater where itself；It is preset in the photoelectricity optical repeater to be used for bearing downlink In the downlink optical signal that the wavelength of the light wave of optical signal is sent with the third multiplexing demultiplexing device, for carrying the downlink light The wavelength of the light wave of signal is identical.

2. photoelectricity optical repeater as described in claim 1, which is characterized in that the photoelectricity optical repeater further includes：Logic list Member；

The OLT receivers are additionally operable to export detection signal to logic unit, when which is signal detection SD signals, It is effective when OLT receivers receive uplink optical signal to detect signal, is high level；The detection signal is dropout LOS signals When, detection signal is effective when OLT receivers do not receive uplink optical signal, is low level；

The logic unit, for the detection signal of reception be SD signals and detection invalidating signal when, instruction ONU transceiver and OLT receivers stop executing the operation for uplink optical signal, and in the detection signal of reception be SD signals and detection signal is effective When, indicate that ONU transceiver and OLT receivers execute the operation for uplink optical signal；It is LOS signals in the detection signal of reception And detection signal it is effective when, indicate that ONU transceiver and OLT receivers stop executing the operation for uplink optical signal, receiving Detection signal when being LOS signals and detection invalidating signal, indicate that ONU transceiver and OLT receivers are executed and believe for uplink linght Number operation.

3. photoelectricity optical repeater as claimed in claim 2, which is characterized in that

The logic unit is additionally operable to when the detection signal of reception is effective, indicates register of the timing unit to its own again It is resetted, alternatively, in the detection invalidating signal of reception, timing unit resets the register of its own again for instruction.

4. a kind of length is away from box, which is characterized in that the length includes away from box：Photoelectricity optical repeater, 1：N couplers and image intensifer OA；

The OA, for output after being amplified to the downlink optical signal from optical line terminal OLT to 1：N couplers；

Described 1：N couplers, the downlink optical signal for exporting OA are divided into the roads N, and respectively output give itself be connected it is N number of Optical splitter, and the uplink optical signal that each optical splitter exports is coupled as exporting afterwards all the way and gives photoelectricity optical repeater；

The photoelectricity optical repeater, for coming from 1：The uplink optical signal of N couplers carries out reshaping and amplifies again, and exports To OLT；

Wherein, the photoelectricity optical repeater further includes：Clock recovery unit and again timing unit；ONU transceiver is additionally operable to receive The downlink optical signal of third multiplexing demultiplexing device output, and the downlink optical signal is converted into downstream electrical signals and is exported to itself Clock recovery unit in the photoelectricity optical repeater at place, the clock recovery unit, for from the downstream electrical signals received In extract reference clock, and the reference clock is exported to the timing unit again in the photoelectricity optical repeater where itself； The timing unit again, the uplink electrical signals for receiving the OLT receivers output in the photoelectricity optical repeater where itself, profit Timing again is carried out to the uplink electrical signals with the reference clock received, and the uplink electrical signals after timing again are exported to certainly The ONU transceiver in photoelectricity optical repeater where body；It is preset in the photoelectricity optical repeater to be used for bearing downlink optical signal Light wave the downlink optical signal that sends of wavelength and the third multiplexing demultiplexing device in, for carrying the downlink optical signal The wavelength of light wave is identical.

5. as claimed in claim 4 long away from box, which is characterized in that the length further includes away from box：Current divider and local management list Member；

The current divider is exported all the way to local management unit for the downlink optical signal from OLT to be divided into two-way, another Road is exported to the OA, and the uplink optical signal that the photoelectricity optical repeater exports is forwarded to OLT；

The local management unit is matched for carrying out parameter to photoelectricity optical repeater and OA according to the downlink optical signal received It sets, and local parameter information is reported to OLT.

6. as claimed in claim 5 long away from box, which is characterized in that the photoelectricity optical repeater includes：ONU transceiver and OLT Receiver；

The OLT receivers, for coming from 1：After the uplink optical signal of N couplers carries out opto-electronic conversion and amplifies reshaping again It exports to ONU transceiver；

The ONU transceiver, for being exported to current divider after carrying out electro-optic conversion from the uplink electrical signals of OLT receivers.

7. as claimed in claim 6 long away from box, which is characterized in that the photoelectricity optical repeater further includes：Logic unit；

The OLT receivers are additionally operable to export detection signal to logic unit, when which is signal detection SD signals, Detection signal receives 1 in OLT receivers：It is effective when the uplink optical signal of the output of N couplers, it is high level, detection letter When number being dropout LOS signals, detection signal does not receive 1 in OLT receivers：When the uplink optical signal of N couplers output Effectively, it is low level；

The logic unit, for the detection signal of reception be SD signals and detection invalidating signal when, instruction ONU transceiver and OLT receivers stop executing the operation for uplink optical signal, and in the detection signal of reception be SD signals and detection signal is effective When, indicate that ONU transceiver and OLT receivers execute the operation for uplink optical signal；It is LOS signals in the detection signal of reception And detection signal it is effective when, indicate that ONU transceiver and OLT receivers stop executing the operation for uplink optical signal, receiving Detection signal when being LOS signals and detection invalidating signal, indicate that ONU transceiver and OLT receivers are executed and believe for uplink linght Number operation.

8. a kind of length is away from box, which is characterized in that the length includes away from box：N photoelectricity optical repeater, 1：N couplers, first are answered It is the positive integer more than 1 with/demultiplexer, the second multiplexing demultiplexing device and image intensifer OA, the N, the n is more than 1 Positive integer；

The OA, for output after being amplified to the downlink optical signal from mixing optical line terminal H-OLT to 1：N is coupled Device；

Described 1：N couplers, the downlink optical signal for exporting OA are divided into the roads N, and respectively output give itself be connected it is N number of Optical splitter, and the uplink optical signal that each optical splitter exports is coupled as being exported afterwards all the way to the second multiplexing demultiplexing device；

Second multiplexing demultiplexing device, for 1 will to be come from：The uplink optical signal of N couplers is decomposed into the roads k traveling optical signal, And export to k photoelectricity optical repeater, wherein in the traveling optical signal of the roads k, carry the wave of the light wave per road traveling optical signal Length is different, and the k is the positive integer more than 1 and less than or equal to n；

The photoelectricity optical repeater, for will carry out reshaping from the uplink optical signal of the second multiplexing demultiplexing device and put again Output is to the first multiplexing demultiplexing device after big；

First multiplexing demultiplexing device, for the roads the k traveling optical signal from photoelectricity optical repeater to be combined into uplink linght all the way Signal, and export to H-OLT；

Wherein, the photoelectricity optical repeater further includes：Clock recovery unit and again timing unit；ONU transceiver is additionally operable to receive The downlink optical signal of third multiplexing demultiplexing device output, and the downlink optical signal is converted into downstream electrical signals and is exported to itself Clock recovery unit in the photoelectricity optical repeater at place, the clock recovery unit, for from the downstream electrical signals received In extract reference clock, and the reference clock is exported to the timing unit again in the photoelectricity optical repeater where itself； The timing unit again, the uplink electrical signals for receiving the OLT receivers output in the photoelectricity optical repeater where itself, profit Timing again is carried out to the uplink electrical signals with the reference clock received, and the uplink electrical signals after timing again are exported to certainly The ONU transceiver in photoelectricity optical repeater where body；It is preset in the photoelectricity optical repeater to be used for bearing downlink optical signal Light wave the downlink optical signal that sends of wavelength and the third multiplexing demultiplexing device in, for carrying the downlink optical signal The wavelength of light wave is identical.

9. as claimed in claim 8 long away from box, which is characterized in that preset for carrying uplink in the photoelectricity optical repeater In the uplink optical signal that the wavelength of the light wave of optical signal and the second multiplexing demultiplexing device are sent, for carrying the uplink optical signal Light wave wavelength it is identical；

Second multiplexing demultiplexing device is specifically used for that 1 will be come from：The uplink optical signal of N couplers is decomposed into the roads k uplink linght Signal, and respectively exported the roads k traveling optical signal to wave respectively according to the wavelength for the light wave for carrying each road traveling optical signal Long matched photoelectricity optical repeater.

10. as claimed in claim 8 long away from box, which is characterized in that the length further includes away from box：Current divider and local management list Member；

The current divider is exported to local management unit, separately all the way for the downlink optical signal from H-OLT to be divided into two-way It is exported all the way to the OA, and the uplink optical signal that first multiplexing demultiplexing device exports is forwarded to H-OLT；

The local management unit is matched for carrying out parameter to photoelectricity optical repeater and OA according to the downlink optical signal received It sets, and local parameter information is reported to H-OLT.

11. as claimed in claim 10 long away from box, which is characterized in that the photoelectricity optical repeater includes：ONU transceiver and OLT receivers；

The OLT receivers, for carrying out opto-electronic conversion to the uplink optical signal from the second multiplexing demultiplexing device and amplifying again Output is to the ONU transceiver in the photoelectricity optical repeater where itself after reshaping；

The ONU transceiver, for multiple to first to output after carrying out electro-optic conversion from the uplink electrical signals of OLT receivers With/demultiplexer.

12. as claimed in claim 11 long away from box, which is characterized in that the photoelectricity optical repeater further includes：Logic unit；

The OLT receivers are additionally operable to export detection signal to logic unit, when which is signal detection SD signals, Detection signal is effective when OLT receivers receive the uplink optical signal of the second multiplexing demultiplexing device output, is high level, should When detection signal is dropout LOS signals, detection signal does not receive the output of the second multiplexing demultiplexing device in OLT receivers Uplink optical signal when it is effective, be low level；

The logic unit, for the detection signal of reception be SD signals and detection invalidating signal when, instruction ONU transceiver and OLT receivers stop executing the operation for uplink optical signal, and in the detection signal of reception be SD signals and detection signal is effective When, indicate that ONU transceiver and OLT receivers execute the operation for uplink optical signal；It is LOS signals in the detection signal of reception And detection signal it is effective when, indicate that ONU transceiver and OLT receivers stop executing the operation for uplink optical signal, receiving Detection signal when being LOS signals and detection invalidating signal, indicate that ONU transceiver and OLT receivers are executed and believe for uplink linght Number operation.

13. as claimed in claim 12 long away from box, which is characterized in that the length further includes away from box：The double news of optical splitter, the first light Device and third multiplexing demultiplexing device；The ONU transceiver includes uplink optical signal emission port and downlink optical signal receiving terminal Mouthful；

The first smooth diplexer, detaches for the optical signal to reception, and the first multiplexing demultiplexing device is come from receiving Uplink optical signal emission port output uplink optical signal when, which is exported to current divider, receiving come From the downlink optical signal of current divider when, which is exported to optical splitter；

The optical splitter, for the downlink optical signal of the first smooth diplexer output to be divided into two-way, and will wherein export all the way to Third multiplexing demultiplexing device, another way are exported to OA；

The third multiplexing demultiplexing device, for the downlink optical signal from optical splitter to be decomposed into the roads m downlink optical signal, point It does not export to the downlink optical signal receiving port of the ONU transceiver in m photoelectricity optical repeater, wherein the roads m downlink light is believed In number, the wavelength carried per the light wave of road downlink optical signal is different, and the m is the positive integer more than 1 and less than or equal to n.

14. as claimed in claim 13 long away from box, which is characterized in that

The third multiplexing demultiplexing device, the downlink light specifically for the downlink optical signal from optical splitter to be decomposed into the roads m are believed Number, and respectively exported the roads m downlink optical signal to wavelength respectively according to the wavelength for the light wave for carrying each road downlink optical signal Matched photoelectricity optical repeater.

15. a kind of length using described in claim 4 is away from box to the processing method of uplink optical signal, which is characterized in that the side Method includes：

1：The uplink optical signal of each optical splitter is coupled as all the way by N couplers when receiving the uplink optical signal of each optical splitter After export and give photoelectricity optical repeater；

Photoelectricity optical repeater pair 1：The uplink optical signal of N couplers output carries out reshaping and amplifies again, and exports to OLT.

16. a kind of length using described in claim 4 is away from box to the processing method of downlink optical signal, which is characterized in that the side Method includes：

The downlink optical signal is amplified and is exported to 1 when receiving the downlink optical signal from optical line terminal OLT by OA：N Coupler；

1：The OA downlink optical signals exported are divided into the roads N by N couplers, and output gives itself connected N number of light splitting respectively Device.

17. it is a kind of using length according to any one of claims 8 away from box to the processing method of uplink optical signal, which is characterized in that the side Method includes：

1：N couplers are when receiving the uplink optical signal from coupled each optical splitter, by the uplink linght of each optical splitter Signal is coupled as being exported afterwards all the way to the second multiplexing demultiplexing device；

Second multiplexing demultiplexing device is by 1：The roads k traveling optical signal is decomposed into the uplink optical signal of N couplers output, and respectively It exports to k photoelectricity optical repeater, wherein in the traveling optical signal of the roads k, carry the wavelength of the light wave per road traveling optical signal Different, the k is the positive integer more than 1 and less than or equal to n；

K photoelectricity optical repeater carries out reshaping to the uplink optical signal of the second multiplexing demultiplexing device output respectively and amplifies again After export to the first multiplexing demultiplexing device；

The uplink optical signal that k photoelectricity optical repeater exports is combined into uplink optical signal all the way by the first multiplexing demultiplexing device, and defeated Go out to H-OLT.

18. it is a kind of using length according to any one of claims 8 away from box to the processing method of downlink optical signal, which is characterized in that the side Method includes：

OA amplifies the downlink optical signal and exports to 1 when receiving the downlink optical signal from H-OLT：N couplers；

1：The OA downlink optical signals exported are divided into the roads N by N couplers, and output gives itself connected N number of optical splitter respectively.