WO2019006758A1 - Optical add-drop multiplexer and optical communication apparatus - Google Patents

Abstract

Provided are an optical add-drop multiplexer and an optical communication apparatus. The optical add-drop multiplexer comprises a first optical processing unit, a second optical processing unit and a third optical processing unit. The first optical processing unit is used for: receiving a first optical signal by means of a first port thereof; dividing the first optical signal into a second optical signal and a third optical signal; outputting the second optical signal by means of a second port thereof; and outputting the third optical signal by means of a third port thereof. The second optical processing unit is used for: receiving the second optical signal by means of a first port thereof; carrying out down-wave processing on the second optical signal, wherein an obtained signal comprises a first down-wave optical signal; and outputting the first down-wave optical signal by means of a fourth port thereof. The second optical processing unit is further used for: receiving the third optical signal by means of a second port thereof; carrying out down-wave processing on the third optical signal, wherein an obtained signal comprises a second down-wave optical signal; and outputting the second down-wave optical signal by means of a third port thereof. The third optical processing unit is used for: receiving the first down-wave optical signal by means of a third port thereof; receiving the second down-wave optical signal by means of a second port thereof; combining the first down-wave optical signal and the second down-wave optical signal into a third down-wave optical signal; and outputting the third down-wave optical signal by means of a first port thereof. The optical add-drop multiplexer and the optical communication apparatus provided in the present application can provide reliable communication.

Description

Optical add/drop multiplexer and optical communication device Technical field

The present application relates to the field of optical communications and, more particularly, to optical add/drop multiplexers and optical communication devices.

Background technique

With the growth of data services in geometric progression, especially the rapid spread of the Internet, existing network technologies are far from being able to adapt to the requirements of network speed and bandwidth. The wavelength division multiplexing (WDM) technology that has been used since the mid-1990s can make good use of the bandwidth capability of optical fibers, and is a relatively economical and practical method for expanding transmission capacity, and thus has been rapidly developed in recent years. The WDM all-optical network based on WDM transmission will become a new-generation optical fiber communication network with its high transparency, compatibility, reconfigurability and scalability.

An optical add-drop multiplexer (OADM) is one of the key components of a wavelength division multiplexed optical network. Its function is to selectively receive and transmit certain wavelength signals from the transmission optical path. Affects the transmission of other wavelength signals.

A typical OADM node can be represented by a four-port model, which can be called a line input, a line output, a down output, and an add input. The specific working process of the OADM is as follows: the WDM signal from the line contains N wavelength signals, and the N wavelength signals enter the line input end of the OADM; the OADM selectively outputs the downlink signals from the N wavelength signals according to service requirements. The terminal outputs the desired wavelength signal and correspondingly inputs the desired wavelength signal at the upstream input; while other locally independent wavelength signals pass directly through the OADM, are multiplexed with the upstream wavelength signal, and are output from the line output.

However, OADMs currently obtained by silicon light technology usually only work in one polarization state. That is to say, the OADM obtained by the silicon light technology can only process the light wave signal working in a certain polarization state. This greatly limits the diversity of wavelength signals that OADM can handle.

To solve this problem, a polarization splitter and rotator (PSR) can be connected to the line input of the OADM. In this way, regardless of the polarization state of the light wave in the line signal, it can be converted into a polarized wave that can be processed by the OADM through the PSR.

Normally, the PSR can separate one beam of light into two beams of light, and the power of any resulting beam of light will be less than the power transmitted before polarization. That is to say, if the OADM only processes part of the light wave obtained by PSR polarization conversion, the power of the light wave outputted from the lower output end of the OADM will be affected.

In order to ensure the power of the downlink signal passing through the OADM, the two output ports of the PSR are usually connected to one OADM, and then the other PSR is connected to the lower output of the two OADMs. The PSR can combine the downlink signals of the two OADM outputs into a final downlink signal, thereby ensuring the optical power of the downlink signal.

Although the optical add/drop multiplexer ensures the optical power of the downlink signal to a certain extent, when the PSR performs the downlink signal recombination, the accuracy of the composited signal cannot satisfy the requirement, thereby affecting the reliability of the communication.

Summary of the invention

The application provides an optical add/drop multiplexer and an optical communication device, which can improve the accuracy of the downlink signal, thereby providing communication reliability.

In a first aspect, the present application provides an optical add/drop multiplexer. The optical add/drop multiplexer includes a first optical processing unit, a second light processing unit and a third light processing unit.

The first optical processing unit is configured to: receive, by the first port of the first optical processing unit, the first optical signal; divide the first optical signal into the second optical signal and the third optical signal; and pass through the second port of the first optical processing unit And outputting a second optical signal; outputting a third optical signal through a third port of the first optical processing unit.

The second optical processing unit is configured to: receive, by the first port of the second optical processing unit, a second optical signal; perform a down-wave processing on the second optical signal, where the obtained signal includes a first lower-wave optical signal; and the second optical processing unit The fourth port outputs the first lower wave optical signal.

The second optical processing unit is further configured to: receive, by the second port of the second optical processing unit, a third optical signal; perform downlink processing on the third optical signal, where the obtained signal includes a second lower optical signal; and the second optical processing The third port of the unit outputs a second lower wave optical signal.

The third optical processing unit is configured to: receive, by the third port of the third optical processing unit, the first lower-wave optical signal; receive, by the second port of the third optical processing unit, the second lower-wave optical signal; The second lower wave optical signal synthesizes the third lower wave optical signal; the third lower optical signal is output through the first port of the third optical processing unit.

In the optical add/drop multiplexer, light output from two ports of the first optical processing unit is input to the same second optical processing unit. That is to say, the two lower-wave signals input to the third optical processing unit are obtained by down-wave processing the two optical signals by the same lower-wave unit. This can help the third optical processing unit to combine the two lower waves to obtain the original lower wave signal, thereby helping to improve the accuracy of the lower wave signal and ultimately improving the reliability of the communication. In addition, the optical add/drop multiplexer can also reduce the number of down-wave units, helping to save costs.

With reference to the first aspect, in a first possible implementation manner, the second optical processing unit performs a downstream processing on the second optical signal, the obtained signal further includes a first through optical signal; and the second optical processing unit is in a third The optical signal is subjected to down-wave processing, and the obtained signal further includes a second through optical signal.

The second light processing unit is further configured to: output a first through light signal through a second port of the second light processing unit; and output a second through light signal through the first port of the second light processing unit.

The first optical processing unit is further configured to: receive a first through optical signal through a third port of the first optical processing unit; receive a second through optical signal through a second port of the first optical processing unit; The pass light signal and the second through light signal synthesize a third through light signal; the third through light signal is output through a first port of the first light processing unit.

In this implementation, the multiplexed first optical processing unit combines the first through signal and the second through signal into one through signal, which helps to reduce the number of processing units in the optical add/drop multiplexer, thereby further saving cost.

In conjunction with the first aspect or the first possible implementation, in a second possible implementation, the first optical processing unit is a polarization beam splitting rotator.

With reference to the first aspect or any one of the foregoing possible implementation manners, in a third possible implementation manner, the second optical processing unit is a filter.

In conjunction with the first aspect or any one of the possible implementations described above, in a fourth possible implementation, the third optical processing unit is a polarization splitting rotator.

In a second aspect, the present application provides an optical add/drop multiplexer. The optical add/drop multiplexer includes a first optical processing unit, M second optical processing units, and M third optical processing units, and M is an integer greater than one.

The first optical processing unit is configured to: receive, by the first port of the first optical processing unit, the first optical signal; divide the first optical signal into the second optical signal and the third optical signal; and pass through the second port of the first optical processing unit And outputting a second optical signal; outputting a third optical signal through a third port of the first optical processing unit.

Among the M second light processing units, the first second light processing unit is configured to: receive the second optical signal through the first port of the first second optical processing unit; and perform down-wave processing on the second optical signal to obtain The signal includes a lower wave optical signal C _1,1 and a through optical signal L _1,1 ; the lower optical signal C _{1,1 is} output through the fourth port of the first second optical processing unit; and passes through the first second optical processing unit The second port outputs a through optical signal L _1,1 .

The ith second optical processing unit is configured to: receive, by the first port of the i-th second optical processing unit, the second port output of the i-1th second optical processing unit Straight-through optical signal L _1,i-1 ; down-converting the through-light optical signal L _1,i-1 , the obtained signal includes the lower-wave optical signal C _1,i and the through-light optical signal L _1,i ; The fourth port of the two-light processing unit is configured to output the lower-wave optical signal C _1,i ; the through-port optical signal L _{1,i is} output through the second port of the i-th second optical processing unit; wherein i is an integer, taken from 2 To M.

The Mth second optical processing unit is configured to: receive the third optical signal through the second port of the Mth second optical processing unit; and perform downlink processing on the third optical signal to obtain The signal includes a lower wave optical signal C _2,M and a through optical signal L _2,M ; and a lower wave optical signal C _{2,M is} output through the third port of the Mth second optical processing unit, through the Mth second light The first port of the processing unit outputs the through optical signal L _2,M .

The Mth second optical processing unit is configured to: receive, by the second port of the jth second optical processing unit, the first port output of the j+1th second optical processing unit Straight-through optical signal L _2,j+1 ; down-converting the through-light optical signal L _2,j+1 , the obtained signal includes a lower-wave optical signal C _2,j and a through-light optical signal L _2,j ; The fourth port of the two-light processing unit outputs a lower-wave optical signal C _2,j ; and outputs a through-pass signal L _2,j through the first port of the j-th second optical processing unit; wherein j is an integer, and is taken from 1 to M- 1.

Among the M third optical processing units, the kth third optical processing unit is configured to: receive the lower-wave optical signal C _1,k through the third port of the kth third optical processing unit; and pass the k-th third optical processing The second port of the unit receives the lower wave optical signal C _2,k ; the lower wave optical signal C _1,k and the lower wave optical signal C _{2,k are} combined into the lower wave optical signal C _k ; pass through the first port of the kth third optical processing unit The lower wave optical signal C _{k is} output; where k is an integer and is taken from 1 to M.

In the optical add/drop multiplexer, light output from two ports of the first optical processing unit is input to the same second optical processing unit. That is to say, the two lower-wave signals input to the third optical processing unit are obtained by down-wave processing the two optical signals by the same lower-wave unit. This can help the third optical processing unit to combine the two lower waves to obtain the original lower wave signal, thereby helping to improve the accuracy of the lower wave signal and ultimately improving the reliability of the communication.

In addition, the optical add-drop multiplexer can also reduce the number of down-wave units, which helps to save costs; and the optical add-drop multiplexer can also perform downlink processing of signals of multiple wavelengths.

With reference to the second aspect, in a first possible implementation manner, the first optical processing unit is configured to: receive the through optical signal L _1,M through the third port of the first optical processing unit; and pass the first optical processing unit The two ports receive the through optical signal L _2,1 ; the through optical signal L _1,M and the through optical signal L _{2,1 are} combined into a third through optical signal; and the third through optical signal is output through the first port of the first optical processing unit .

In conjunction with the second aspect or the first possible implementation, in a second possible implementation, the first optical processing unit is a polarization beam splitting rotator.

With reference to the second aspect or any one of the foregoing possible implementation manners, in a third possible implementation manner, the second optical processing unit is a filter.

In conjunction with the second aspect or any one of the possible implementations described above, in a fourth possible implementation, the third optical processing unit is a polarization beam splitting rotator.

In a third aspect, the present application provides an optical communication device. The optical communication device includes a first optical add/drop multiplexer and a fourth optical processing unit, the first optical add/drop multiplexer being the first possible implementation in the first aspect or the second aspect An optical add/drop multiplexer in a first possible implementation.

The fourth optical processing unit is configured to: receive, by the first port of the fourth optical processing unit, the first optical signal; transmit the first optical signal to the second port of the fourth optical processing unit; and pass the fourth optical processing The second port of the unit outputs a first optical signal.

The first optical signal received by the first port of the first optical processing unit of the first optical add/drop multiplexer includes the first optical signal output by the second port of the fourth optical processing unit.

The fourth optical processing unit is further configured to: receive, by the second port of the fourth optical processing unit, a third through signal outputted by the first port of the first optical processing unit; and transmit the third through signal to the fourth optical processing unit in one direction a third port; outputting a third through signal through the third port of the fourth optical processing unit.

The optical communication device can implement signal forwarding.

With reference to the third aspect, in a first possible implementation, the optical communication device further includes a second optical add/drop multiplexer, where the second optical add/drop multiplexer is the first possible implementation of the first aspect or An optical add/drop multiplexer in a first possible implementation of the second aspect.

The fourth optical processing unit is further configured to: receive, by the third port of the fourth optical processing unit, the fourth optical signal, and transmit the fourth optical signal to the fourth port of the fourth optical processing unit; The fourth port of the processing unit outputs a fourth optical signal.

The first optical signal received by the first port of the first optical processing unit of the second optical add/drop multiplexer is a fourth optical signal.

The fourth optical processing unit is further configured to: receive, by the fourth port of the fourth optical processing unit, a third through optical signal output by the first port of the second optical add/drop multiplexer.

The second optical add/drop multiplexer is further configured to unidirectionally transmit the third through optical signal output by the first port of the second optical add/drop multiplexer to the first port of the fourth optical processing unit.

The fourth optical processing unit is further configured to: output, by the first port of the fourth optical processing unit, a third through optical signal output by the first port of the second optical add/drop multiplexer.

The optical communication device can implement two-way communication.

In conjunction with the third aspect, in a possible implementation, the fourth light processing unit is a circulator.

DRAWINGS

1 is a schematic architectural diagram of a communication system to which an optical add/drop multiplexer of an embodiment of the present application can be applied.

2 is a schematic structural diagram of an optical add/drop multiplexer in the prior art.

FIG. 3 is a schematic structural diagram of an optical add/drop multiplexer according to an embodiment of the present application.

4 is a schematic structural diagram of an optical add/drop multiplexer according to an embodiment of the present application.

FIG. 5 is a schematic configuration diagram of an optical communication apparatus according to an embodiment of the present application.

FIG. 6 is a schematic diagram of signal flow of an optical communication device according to an embodiment of the present application.

Detailed ways

For ease of understanding, an exemplary diagram of a communication system architecture capable of implementing the optical add/drop multiplexer of the embodiment of the present application will be described first. It should be understood that the embodiments of the present application are not limited to the system architecture shown in FIG. 1.

In the communication system shown in FIG. 1, between the communication node 110 and the communication node 120, the communication node 120 and the communication node 130 can communicate via optical signals.

Each communication node can optically communicate with other communication nodes by optical signals of corresponding wavelengths, that is, other communication nodes The information transmitted to a certain communication node is usually carried in an optical signal of a certain wavelength, and the information transmitted by a certain communication node to other communication nodes is usually carried in an optical signal of a certain wavelength.

In the communication system shown in FIG. 1, the line signal transmitted by the communication node 120 to the communication node 110 may include one or more wavelengths of optical signals. The optical signal having the wavelength λ ₁ carries information transmitted by the communication node 120 or other communication node, such as the communication node 130, to the communication node 110. In addition, the information transmitted by the communication node 110 to the communication node 120 or other communication node, such as the communication node 130, may also be carried in the optical signal of the wavelength λ ₁ among the optical signals transmitted by the communication node 110 to the communication node 120.

The communication node 110 or the communication node 130 may be an end node of the communication system or an intermediate node. For example, if the communication node 110 is an end node, it is illustrated that the communication node 110 acquires an optical signal having a wavelength of λ ₁ in a line signal including one or more signals, and/or adds a wavelength to a line signal including one or more signals. The optical signal of λ ₁ is sufficient, and it is no longer necessary to forward optical signals of other wavelengths to other communication nodes.

Any of the communication node 110, the communication node 120, and the communication node 130 may include an optical add/drop multiplexer. Briefly, an optical add/drop multiplexer can be used to separate an optical signal of a certain wavelength in a line signal including one or more signals from the line signal. In addition, the optical add/drop multiplexer can also be used to combine optical signals of a certain wavelength into the line signal. In addition, the optical add/drop multiplexer can also be used to transparently transmit optical signals that are not required by the communication node to which it belongs, or to pass through to other communication nodes.

2 is a schematic structural diagram of an optical add/drop multiplexer in the prior art. The port 212 of the PSR 210 is connected to the port 221 of the OADM unit 220, the port 213 of the PSR 210 is connected to the port 231 of the OADM unit 230, the port 222 of the OADM unit 220 is connected to the port 241 of the PSR 240, and the port 232 and PSR of the OADM unit 230 are connected. Ports 142 of 240 are connected. The OADM unit 220 and the OADM unit 230 may be filters.

In the optical add/drop multiplexer shown in FIG. 2, the line signal is input and received from the port 211 of the PSR 210, and the PSR 210 divides the line signal into two beams of polarized light that the OADM unit 220 can process. One of the polarized lights is output from the port 212 of the PSR 210 to the port 221 of the OADM unit 220, and the other beam of polarized light is output from the port 213 of the PSR 210 to the port 231 of the OADM unit 230.

The OADM unit 220 performs down-wave processing on the polarized light received by the port 221 to obtain a first down-wave signal of a first wavelength, and the first down-wave signal is output from the port 224 of the OADM unit 220.

The OADM unit 230 performs down-wave processing on the polarized light received by the port 231 to obtain a second lower-wavelength signal of the first wavelength, and the second lower-wavelength signal is output from the port 232 of the OADM unit 230.

The first down wave signal and the second down wave signal received by the port 241 and the port 242 of the PSR 240 are subjected to up-wave processing to obtain a third down-wave signal that is consistent with the polarization state of the line signal received by the port 110 of the PSR 210. The third down-wave signal is output from port 243 of PSR 240.

The first downlink signal is an optical signal carrying information transmitted to the communication node to which the optical add/drop multiplexer belongs.

The optical add/drop multiplexer shown in FIG. 2, although the entire optical add/drop multiplexer can process the line signal in a random polarization state and helps to ensure the power of the third down wave signal output by the PSR 240, In the optical add/drop multiplexer, if there is a performance difference between the OADM unit 220 and the OADM unit 230, if the filtering wavelengths caused by the processing instability are inconsistent, the power difference between the two lower wave signals input to the PSR 240 is large. This may cause the PSR 240 to fail to recombine the first down-wave signal and the second down-wave signal into a third lower-wave signal that is consistent with the polarization state of the line signal received by the port 210 of the PSR 210, thereby causing the entire polarization grading mechanism to fail, thereby affecting The reliability of communication.

Therefore, the present application proposes a new optical add/drop multiplexer. Optical add/drop multiplexer of an embodiment of the present application The schematic structure is shown in Figure 3. It should be understood that the optical add/drop multiplexer 300 shown in FIG. 3 is only an example, and the optical add/drop multiplexer of the embodiment of the present application may further include other modules or units, or include functions similar to those of the modules in FIG. Module.

The optical add/drop multiplexer 300 includes a PSR 310, a filter 320, and a PSR 330.

PSR 310 includes port 311, port 312, and port 313; filter 320 includes port 321, port 322, port 323, and port 324; PSR 330 includes port 331, port 332, and port 333.

Port 312 of PSR 310 is coupled to port 321 of filter 320; port 313 of PSR 310 is coupled to port 322 of filter 320; port 323 of filter 320 is coupled to port 331 of PSR 330; port 324 and PSR of filter 320 Port 332 of 330 is connected.

It should be understood that the above connections may be directly connected or indirectly connected.

Port 311 of PSR 310 can be used as the line signal input of optical add/drop multiplexer 300, and port 333 of PSR 330 can be used as the downstream signal output of optical add/drop multiplexer 300. Wherein, the line signal refers to an optical signal received from another communication node or other optical add/drop multiplexer; the output of the lower wave signal is an optical add/drop multiplexer 300 for outputting all optical signals of a certain wavelength obtained by filtering by OADM320. The optical signal carries information of a communication node to which the optical add/drop multiplexer belongs.

The optical add/drop multiplexer 300 is used for the lower wave, that is, when the optical signal of a certain wavelength in the line signal is separated from the line signal, the optical signal in the optical add/drop multiplexer 300 flows as follows.

The first optical signal (ie, the line signal) is input from the port 311 of the PSR 310; the PSR 310 splits the first optical signal into two optical signals of the same polarization state (referred to as a second optical signal and a third optical signal, respectively), such as two A transverse-electric (TE) polarized light signal, which is a polarized light signal that filter 320 can process; a second optical signal is output from port 312 of PSR 310 to port 321 of filter 320, The third optical signal is output from port 313 of PSR 310 to port 322 of filter 320.

After the second optical signal received from the port 321 of the filter 320 is subjected to the down-wave processing of the filter 320, the optical signal of the corresponding wavelength (the first lower-wave signal) of the second optical signal is output from the port 324 of the filter 320. The through signal (first through signal) obtained after the first lower wave signal of the second optical signal is filtered out is output from the port 322 of the filter 320.

Meanwhile, after the third optical signal received from the port 322 of the filter 320 is subjected to the down-wave processing of the filter 320, the optical signal of the corresponding wavelength (the second lower-wave signal) of the third optical signal is output from the port 323 of the filter 320. . The through signal (second through signal) obtained after the second lower wave signal of the third optical signal is filtered out is output from the port 321 of the filter 320.

The first down-wave signal is input to port 332 of PSR 330, and the second down-wave signal is input to port 331 of PSR 330. The PSR 330 synthesizes the first down-wave signal and the second down-wave signal into a third down-wave signal. The third down-wave signal is output from port 333 of PSR 330.

In the optical add/drop multiplexer 300 shown in FIG. 3, the light output from the two ports of the PSR 310 is input to the same filter 320. That is to say, in the optical add/drop multiplexer 300, the two down-wave signals input to the PSR 330 are obtained by down-wave processing the two polarized optical signals by the same filter 320. This can help the PSR 330 combine the two lower waves to obtain the lower-wave signal of the original polarization state, thereby helping to improve the accuracy of the downlink signal and ultimately improving the reliability of the communication.

In addition, the number of down-wave units is reduced in the optical add/drop multiplexer 300, which contributes to cost savings.

It should be noted that PSR 310, filter 320, and PSR 330 are just one example.

310 in the optical add/drop multiplexer 300 may be any processing unit capable of performing a separation function, that is, capable of converting randomly polarized light into two beams of the same polarization state. This processing unit is referred to as a first optical processing unit in the embodiment of the present application.

The 320 in the optical add/drop multiplexer 300 may be any processing unit capable of implementing a down wave function to obtain a down wave signal. This processing unit is referred to as a second optical processing unit in the embodiment of the present application.

330 in the optical add/drop multiplexer 300 can be any processing unit capable of combining two beams of the same polarized light into one beam of polarized light. This processing unit is referred to as a third optical processing unit in the embodiment of the present application.

In the optical add/drop multiplexer 300, optionally, the first through signal output from the port 322 of the filter 320 may be input to the port 313 of the PSR 310, and the second through signal output from the port 321 of the filter 320 may be input to the PSR 310. Port 312. After the first through signal and the second through signal are input to the PSR 310, the third pass signal is obtained by recombination of the PSR 310. The third through signal is output from port 311 of PSR 310.

It can be seen that the number of polarization units is reduced in the optical add/drop multiplexer 300, which contributes to cost saving.

In the optical add/drop multiplexer 300, optionally, the port 333 of the PSR 330 can receive the first up-wave signal. The PSR 330 divides the first upper wave signal into a second upper wave signal and a third upper wave signal. The second upper wave signal is output from the port 331 of the PSR 330, and the third upper wave signal is output from the port 332 of the PSR 330.

The second upper wave signal is input to the port 323 of the filter 320, and the third upper wave signal is input to the port 324 of the filter 320. After the second upper wave signal and the third upper wave signal are input to the filter 320, the filter 320 may perform upper wave processing on the second upper wave signal and the third upper wave signal. Specifically, the filter 320 combines the second upper wave signal into the first through signal, and outputs it from the port 322 of the filter 320; and combines the third upper wave signal into the second through signal, from the filter 320. Port 321 output. Thus, the third through signal obtained by combining the first through signal and the second through signal includes the first upper wave signal.

A schematic structural diagram of an optical add/drop multiplexer of another embodiment of the present application is shown in FIG. It should be understood that the optical add/drop multiplexer 400 shown in FIG. 4 is only an example, and the optical add/drop multiplexer of the embodiment of the present application may further include other modules or units, or include functions similar to those of the modules in FIG. Module.

The optical add/drop multiplexer 400 includes a PSR 310, M filters 320 (filters 320-1 to 320-M), and M PSRs 330 (PSR 330-1 to PSR 330-M).

The same reference numerals in FIG. 4 as those in FIG. 3 denote the same meanings, and are not described herein again.

Of all the filters 320 included in the optical add/drop multiplexer 400, the port 321 of the latter filter 320 is connected to the port 322 of the previous filter 320. The port 323 of the i-th filter 320 of the M filters 320 is connected to the port 331 of the i-th PSR 330 of the M PSRs 330, and the port 324 of the i-th filter 320 is connected to the port 332 of the i-th PSR 330. It should be understood that the above connections may be directly connected or indirectly connected.

The optical add/drop multiplexer 400 is different from the optical add/drop multiplexer 300 in that, among the two adjacent filters 320, the through signal output from the port 322 of the first filter 320 can be input to the second filter. The port 321 of the buffer 320, the through signal output from the port 321 of the second filter 320, can be input to the port 322 of the first filter 320.

Each of the M filters 320 can down-process the pass-through signals received by its own port 321 and port 322 to obtain two down-wave signals, respectively, from the filter 320. Port 324 and port 323 output.

The downstream signals output from port 323 and port 324 of each filter 320 are input to port 331 and port 332 of the connected PSR 330, respectively. Each PSR 330 combines the two downstream signals received by its own port 331 and port 332 into a downstream signal and outputs it from its own port 333.

That is to say, the optical add/drop multiplexer 400 can perform M lower waves and finally output M composite lower wave signals. Optionally, in the optical add/drop multiplexer 400, the port 333 of any one of the M PSRs 330 can receive the uplink signal, and the uplink signal is separated by the arbitrary one of the PSRs 330 to obtain two uplinks. signal. Wherein, an upper wave signal is output from the port 331 of the arbitrary one of the PSRs 330, and another upper wave signal is output from the port 332 of the any one of the PSRs 330.

The two upper wave signals output by any one of the PSRs 330 are respectively input to the port 323 and the port 324 of the OADM 220 connected to the arbitrary one of the PSRs 330. The contiguous filter 320 combines the two up-wave signals into the pass-through signals output by port 322 and port 321 of the connected filter 320, respectively.

That is to say, the optical add/drop multiplexer 400 can perform M times of uplink.

A schematic structural diagram of an optical communication apparatus according to another embodiment of the present application is shown in FIG. It should be understood that the optical communication device 500 illustrated in FIG. 5 is merely an example, and the optical communication device of the embodiment of the present application may further include other modules or units, or include modules similar in function to the respective modules in FIG. 5.

The optical communication device 500 includes a circulator 510 and an optical add/drop multiplexer 520. The optical add/drop multiplexer 520 may be the optical add/drop multiplexer 300 shown in FIG. 3 or the optical add/drop multiplexer 400 shown in FIG. Specifically, the port 521 of the optical add/drop multiplexer 520 may be the port 311 of the optical add/drop multiplexer 300 or the port 311 of the optical add/drop multiplexer 400.

The circulator 510 includes a port 511, a port 512, and a port 513. Port 511 of circulator 510 receives a line signal that is unidirectionally transmitted to port 512 in circulator 510 and output from port 512.

Port 521 of optical add/drop multiplexer 520 receives the line signal output by port 512 of circulator 510. Next, the optical signal processing flow in the optical add/drop multiplexer 520 can refer to the corresponding flow in the optical add/drop multiplexer 300 or the optical add/drop multiplexer 400.

The port 521 of the optical add/drop multiplexer 520 can output a through signal. The port 512 of the circulator 310 receives the through signal output from the port 521 of the optical add/drop multiplexer 520, and the through signal is unidirectionally transmitted to the port 513 in the circulator and output from the port 513.

The optical communication device 500 can cause the line signal to pass through the downstream processing of the optical add/drop multiplexer 520, and even after the upstream processing, can continue to be transmitted to other optical add/drop multiplexers through the circulator 510 to facilitate other optical divisions. The insertion multiplexer performs upper wave processing and even lower wave processing.

It should be understood that the circulator 510 is just one example. The unit 510 in the optical communication device 500 may be any processing unit having a function of unidirectionally transmitting optical signals, which may be referred to as a fourth optical processing unit.

Optionally, in the optical communication device 500, between the port 511 of the circulator 510 and the port 513, one or more ports may be further included, where any one port may be inserted into the optical add/drop multiplexer 300 or the optical add-drop. The port 311 of the processor 400 is connected so that more down-wave processing and even up-wave processing can be performed.

Alternatively, as shown in FIG. 6, the circulator 510 in the optical communication device 500 may further include a port 514. Correspondingly, the optical communication device 500 may further include an optical add/drop multiplexer 530, which may be an optical add/drop multiplexer 300 or an optical add/drop multiplexer 400. Specifically, the port 513 of the optical add/drop multiplexer 530 is the port 311 of the optical add/drop multiplexer 300, or the port 311 of the optical add/drop multiplexer 400.

In the optical communication device 500 shown in FIG. 6, the port 513 can output a line signal, and the circulator 510 transmits the line signal to the port 514 in one direction and from the port 514.

The port 531 of the optical add/drop multiplexer 530 receives the line signal output from the port 514 of the circulator 510, and performs down-wave processing, even up-wave processing, and then outputs a through signal from the port 513. Optical add/drop multiplexer 530 for line letter The processing flow of the number may refer to the processing flow of the optical add/drop multiplexer 300 or the optical add/drop multiplexer 400, and details are not described herein again.

The port 514 of the circulator 510 receives the through signal output from the port 530 of the optical add/drop multiplexer 530 and transmits the through signal to the port 511 in one direction. The port 511 of the circulator outputs the through signal.

That is, the optical communication device 500 shown in FIG. 6 can realize bidirectional transmission of optical signals. For example, the upstream signal is received from port 511 of circulator 510, processed via optical add/drop multiplexer 520, and output from port 513 of circulator 510; the downstream signal is received from port 513 of circulator 510, via optical add-drop The processing by the processor 530 is again output from the port 511 of the circulator 510.

Optionally, in the optical communication device 500 shown in FIG. 6, the port 513 of the circulator 510 and the port 511 may further include one or more ports in the direction of signal transmission, in the one or more ports. Any port can be connected to the optical add/drop multiplexer 300 or the optical add/drop multiplexer 400. To achieve multiple down waves, even up waves.

The foregoing is only a part of the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. All should be covered by the scope of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims (13)

An optical add/drop multiplexer, comprising: a first optical processing unit, a second optical processing unit, and a third optical processing unit; The first optical processing unit is configured to: receive, by the first port of the first optical processing unit, a first optical signal; divide the first optical signal into a second optical signal and a third optical signal; a second port of the optical processing unit outputs the second optical signal; and outputs the third optical signal through a third port of the first optical processing unit; The second optical processing unit is configured to: receive, by the first port of the second optical processing unit, the second optical signal; perform downlink processing on the second optical signal, where the obtained signal includes a first lower-wave light a signal; outputting the first lower-wave optical signal through a fourth port of the second optical processing unit; The second optical processing unit is further configured to: receive, by the second port of the second optical processing unit, the third optical signal; perform downlink processing on the third optical signal, where the obtained signal includes a second a wave light signal; outputting the second lower wave optical signal through a third port of the second light processing unit; The third optical processing unit is configured to: receive, by the third port of the third optical processing unit, the first lower wave optical signal; and receive, by the second port of the third optical processing unit, the second lower wave light And synthesizing the first lower wave optical signal and the second lower wave optical signal into a third lower wave optical signal; and outputting the third lower wave optical signal through a first port of the third optical processing unit. The optical add/drop multiplexer according to claim 1, wherein the second optical processing unit performs down-wave processing on the second optical signal, and the obtained signal further includes a first through optical signal; The second optical processing unit performs down-wave processing on the third optical signal, and the obtained signal further includes a second through optical signal; The second light processing unit is further configured to: output the first through light signal through a second port of the second light processing unit; output the second through a first port of the second light processing unit Through light signal; The first optical processing unit is further configured to: receive the first through optical signal through a third port of the first optical processing unit; receive the second through a second port of the first optical processing unit Passing through the optical signal; synthesizing the first through optical signal and the second through optical signal into a third through optical signal; outputting the third through optical signal through a first port of the first optical processing unit. The optical add/drop multiplexer according to claim 1 or 2, wherein the first optical processing unit is a polarization splitting rotator. The optical add/drop multiplexer according to any one of claims 1 to 3, wherein the second optical processing unit is a filter. The optical add/drop multiplexer according to any one of claims 1 to 4, wherein the third optical processing unit is a polarization beam splitting rotator. An optical add/drop multiplexer, comprising: a first optical processing unit, M second optical processing units, and M third optical processing units, where M is an integer greater than one; The first optical processing unit is configured to: receive, by the first port of the first optical processing unit, a first optical signal; divide the first optical signal into a second optical signal and a third optical signal; a second port of the optical processing unit outputs the second optical signal; and outputs the third optical signal through a third port of the first optical processing unit; The first second optical processing unit is configured to: receive, by the first port of the first second optical processing unit, the second optical signal; The optical signal is subjected to down-wave processing, and the obtained signal includes a lower-wave optical signal C _1,1 and a through-light optical signal L _1,1 ; and the lower-wave optical signal C _{1 is} output through a fourth port of the first second optical processing unit _{, 1} ; outputting the through optical signal L _1,1 through the second port of the first second optical processing unit; The i-th second optical processing unit is configured to receive, by the first port of the i-th second optical processing unit, the first i-1th second optical processing unit The through-port optical signal L _1,i-1 of the two-port output; the down-converted optical signal L _{1,i-1 is} subjected to down-wave processing, and the obtained signal includes the lower-wave optical signal C _1,i and the through-light optical signal L _1,i Outputting the lower-wave optical signal C _1,i through a fourth port of the ith second optical processing unit; outputting the through-light optical signal L ₁ through a second port of the ith second optical processing unit _{, i} ; where i is an integer, taken from 2 to M; The Mth second optical processing unit is configured to: receive, by the second port of the Mth second optical processing unit, the third optical signal; The optical signal is subjected to down-wave processing, and the obtained signal includes a lower-wave optical signal C _2,M and a through-light optical signal L _2,M ; and the lower-wave optical signal C _{2 is} output through a third port of the Mth second optical processing unit _{, M} ; outputting the through optical signal L _2,M through the first port of the Mth second optical processing unit; The jth second optical processing unit is configured to: receive, by the second port of the jth second optical processing unit, the first j+1th second optical processing unit a through-port optical signal L _2,j+1 outputted by one port; performing down-wave processing on the through-light optical signal L _2,j+1 , the obtained signal comprising a lower-wave optical signal C _2,j and a through-light optical signal L _2,j Outputting the down-wave optical signal C _2,j through a third port of the jth second optical processing unit; outputting the through-pass signal L ₂ through a first port of the j-th second optical processing unit _{, j} ; where j is an integer from 1 to M-1; The kth third optical processing unit is configured to: receive, by the third port of the kth third optical processing unit, a downlink optical signal C _1,k ; The second port of the k third optical processing units receives the lower optical signal C _2,k ; the lower optical signal C _1,k and the lower optical signal C _{2,k are} combined into the lower optical signal C _k ; The first port of the kth third optical processing unit outputs the lower optical signal _Ck ; wherein k is an integer from M1 to M. The light according to claim 6 drop multiplexer, wherein said first optical processing unit for: receiving the through optical signal L ₁ through a third port for the first light processing unit _{, M} ; receiving the through optical signal L _2,1 through the second port of the first optical processing unit; synthesizing the through optical signal L _1,M and the through optical signal L _2,1 into a third through An optical signal; the third through optical signal is output through a first port of the first optical processing unit. The optical add/drop multiplexer according to claim 6 or 7, wherein said first optical processing unit is a polarization splitting rotator. The optical add/drop multiplexer according to any one of claims 6 to 8, wherein the second optical processing unit is a filter. The optical add/drop multiplexer according to any one of claims 6 to 9, wherein the third optical processing unit is a polarization splitting rotator. An optical communication device, comprising: a first optical add/drop multiplexer and a fourth optical processing unit, wherein the first optical add/drop multiplexer is the optical add/drop according to claim 2 or claim 7. multiplexer; The fourth optical processing unit is configured to: receive, by the first port of the fourth optical processing unit, a first optical signal; and transmit the first optical signal to a second port of the fourth optical processing unit Outputting the first optical signal through a second port of the fourth optical processing unit; The first optical signal received by the first port of the first optical processing unit of the first optical add/drop multiplexer includes a first optical signal output by the second port of the fourth optical processing unit; The fourth optical processing unit is further configured to: receive, by the second port of the fourth optical processing unit, a third through signal output by the first port of the first optical processing unit; Transmitting to the fourth light a third port of the processing unit; outputting the third through signal through a third port of the fourth optical processing unit. The optical communication device according to claim 11, wherein said optical communication device further comprises a second optical add/drop multiplexer, said second optical add/drop multiplexer being according to claim 2 or claim 7. Optical add/drop multiplexer The fourth optical processing unit is further configured to: receive, by the third port of the fourth optical processing unit, a fourth optical signal, and transmit the fourth optical signal to the fourth optical processing unit in one direction a port; outputting the fourth optical signal through a fourth port of the fourth optical processing unit; The first optical signal received by the first port of the first optical processing unit of the second optical add/drop multiplexer is the fourth optical signal; The fourth optical processing unit is further configured to: receive, by the fourth port of the fourth optical processing unit, a third through optical signal output by the first port of the second optical add/drop multiplexer; The second optical add/drop multiplexer is configured to unidirectionally transmit a third through optical signal output by the first port of the second optical add/drop multiplexer to a first port of the fourth optical processing unit; The fourth optical processing unit is further configured to: output, by the first port of the fourth optical processing unit, a third through optical signal output by the first port of the second optical add/drop multiplexer. The optical communication device according to claim 11 or 12, wherein the fourth optical processing unit is a circulator.

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