JP2010011486A - Optical communications network - Google Patents

Abstract

【Task】
Provided are an optical signal switching device having a small number of optical components, an optical communication network having an economical configuration capable of long-distance transmission with excellent reliability by combining the devices, and a method for using them.
[Solution]
The optical signal switching device is based on a single configuration, and the optical signal is divided into an optical signal that passes through the device and an optical signal that is inserted / branched in the device, and only the insertion / branch processing is executed in a redundant part. The optical communication network has a configuration in which a plurality of optical signal switching devices and optical transmission paths are arranged so that each of the optical signals made redundant by the optical signal insertion apparatus passes through different optical transmission paths and devices. The optical signal that the device passes is processed in the single part of the device, but the entire optical communication network transmits the redundant optical signal by the route setting of the optical signal switching device and the optical transmission path, and the reliability is improved. The optical communication network is configured to be secured.
[Selection] Figure 2

Description

The present invention relates to a configuration of an optical communication device and an optical communication network and a method for using the same, and more particularly to an optical signal switching device and an optical communication network suitable for processing a plurality of wavelength-multiplexed optical signals, and a method for using them. .

In order to realize high-speed and large-capacity communication networks, not only transmits signals using wavelength-multiplexed optical signals, but also switches (switches) these optical signals as they are in transmission paths and path units (paths). Optical add / drop multiplexer (hereinafter referred to as OADM) and optical cross-connect (
The practical application of an optical signal switching device called OXC) and the construction of an optical communication network using these OADMs and OXCs are being studied.

In the optical communication network, it is required to realize a communication network having a long-distance transmission with high reliability (for example, repeaterless transmission of about 100 km to 300 km) with an economical configuration. In order to achieve high reliability, it is common to use a redundant configuration such as duplexing of the OADM and OXC and duplexing of optical transmission lines. In order to realize long-distance transmission, a technique such as inserting an optical amplifier as shown in Patent Document 1 is generally used in order to compensate for the loss of the optical signal level.

JP-A-5-244098

The OADM and OXC constituting the optical communication network are configured by appropriately combining optical components such as an optical transceiver, an optical switch, an optical coupler, an optical distributor, an optical amplifier, and a transponder.
However, in the existing optical switch, the loss of the optical signal occurs several dB to several tens dB depending on the configuration of the switch and the path setting state. In addition, it is usually necessary to equip optical transmitters and receivers before and after the optical switch, but these optical transceivers also have limitations in optical transmission output power, reception sensitivity, and dynamic range, so the level of the optical signal is reduced. It may be necessary to insert an optical amplifier to be adjusted. Furthermore, in order to realize high reliability, if the redundant configuration as described above is adopted, components such as an optical distributor such as an optical coupler and an optical switch such as a 2 × 1 optical switch are also required.

In future optical communication networks, the above optical coupler, 2 × 1 optical switch, transponder, optical amplifier, etc. will be required for each wavelength in order to increase the capacity by wavelength multiplexing, and a redundant configuration that simply duplicates OADM and OXC. In this case, the apparatus is increased in size and cost. Furthermore, since the optical signal loss of the above optical components (optical switch, optical coupler, 2 × 1 optical switch, etc.) is several dB to several tens dB, in an optical communication network in which many of these components are connected in cascade, If a measure such as inserting an optical amplifier in the middle of the optical transmission path is not taken, the above long-distance transmission requirement is not satisfied, and the cost of the optical communication network is further increased.

In order to construct an optical communication network using wavelength multiplexing capable of long-distance transmission with a large capacity with high reliability and economically, the redundant configuration of the optical communication network and the devices constituting the network is appropriately distributed to It is desirable to reduce the optical loss, increase the reliability, and reduce the cost by reducing the number. That is, the realization of an optical signal switching device having a configuration that is suitable for long-distance transmission with a reduced redundant configuration and reduced number of optical components, is highly reliable, and has an economical structure, construction of an optical communication network combining this device, and further, There is a need to provide an optical communication device that satisfies the requirements and a method for using the optical communication network.

An object of the present invention is to provide an optical signal switching device that satisfies the above requirements. It is another object of the present invention to provide an optical communication network in which this optical signal switching device is combined. Furthermore, it is also possible to provide an optical signal switching device and a method of using the optical communication network for realizing a highly reliable and economical optical communication network using wavelength multiplexing capable of long-distance transmission with a large capacity. Is the purpose.

More specifically, an optical signal switching device configured to reduce the number of optical components by reducing the redundant configuration inside the device and to reduce the loss of optical signals in the optical communication network is provided, and the optical signal switching device is combined. It is an object of the present invention to construct an optical communication network having a configuration. It is also an object of the present invention to provide a usage method for setting a signal path between the optical signal switching device and the optical communication network.

In order to solve the above-described problems, an optical signal switching device according to the present invention is based on a single-layer configuration, and an optical signal that only passes (relays) an input / output optical signal and the device (or device). Divided into optical signals to be processed (added / dropped) by another device connected to
The optical signal to be processed in the apparatus is processed at the redundant portion.

More specifically, the optical signal passing (relaying) through the apparatus is switched in the optical signal path in a single configuration, and the optical signal to be processed is processed after the signal to be inserted is duplicated and processed. Optical signals are output to different optical transmission lines and optical signal switching devices, and conversely, two optical signals received from different optical transmission lines and optical signal switching devices are processed in the duplex part, and then one of the optical signals is processed. The optical signal switching device is configured to branch the signal.

The optical communication network combined with the optical signal switching device of the present invention has a plurality of optical signals so that each of the optical signals duplexed in the device passes (relays) through different optical transmission lines and optical signal switching devices. A switching device is arranged and connected by an optical transmission line, and the optical signal passed (relayed) by each device is processed by a single unit of the device to reduce the number of optical components and suppress the loss of the optical signal. While enabling long-distance transmission, the entire optical communication network has an optical communication network configured to ensure reliability by transmitting (relaying) duplicated optical signals.

Then, (1) the optical signal switching device that inserts the optical signal into the optical communication network outputs the duplexed optical signal to different optical transmission lines and optical signal switching devices, and (2) passes the optical signal ( The optical signal switching device to be relayed) includes an optical transmission line and an optical signal switching device in which the duplicated signals are different from the optical communication network to the optical signal switching device that branches one of the duplicated optical signals. (3) The optical signal switching device for branching the optical signal from the optical communication network collects the duplicated optical signals received from the different optical transmission lines and the optical signal switching device, respectively. The optical signal switching device and the optical communication network are routed so that one of them is branched.

In the above description, duplex is used as an example of a redundant configuration, but the same applies to a redundant configuration based on a multiplexed configuration of triple or higher.

According to the present invention, a low-cost optical signal switching device with a reduced number of redundant components and a small number of optical components and low optical loss is realized. And in an optical communication network combining these devices,
Providing a method for setting the optical signal path so that the reliability of the entire optical communication network is maintained by using the redundant configuration part and the single part separately, so it is suitable for economical long-distance transmission and excellent in reliability. An optical communication network having the configuration is realized.

The network block diagram which shows the structural example of the optical communication network provided with the optical signal switching apparatus of this invention. The block block diagram which shows the structural example of the optical signal switching apparatus of this invention. Similarly, the block block diagram which shows another structural example of an optical signal switching apparatus. Explanatory drawing (1) explaining the usage method of the optical signal switching apparatus and optical communication network of this invention. Explanatory drawing (2) explaining the usage method of an optical signal switching apparatus and an optical communication network similarly.

Hereinafter, the configuration of the optical signal switching device of the present invention, and the configuration of an optical communication network using this device,
In addition, an embodiment of a method for using these devices and a communication network will be described in detail with reference to the drawings.

FIG. 1 is a network configuration diagram illustrating a configuration example of an optical communication network in which an optical signal switching device according to the present invention is used.
The optical communication network 10 according to the present invention includes an optical fiber switching device 100 (100-1 to 100-10) and a communication device (hereinafter referred to as a terminal T) under the control of the optical signal switching device 100 (100-1 to 100-10).
And 300 (300-1 to 6). Also, the device 100 and the optical fiber 20
A management device NMS 400 that monitors and controls 0 and 300 is also provided in the optical communication network 10.

Specifically, an optical signal 300 wavelength-multiplexed from each optical fiber 200 is transmitted / received, and an optical signal necessary for the terminal T connected to the own device is branched or inserted therein, thereby subordinate the optical fiber 300.
Optical add / drop multiplexers (OADMs: 100-1 to 3, 100-8)
And 10), when the wavelength-multiplexed optical signal is received from each optical fiber 200, the received optical signal is switched for each signal and multiplexed to the destination optical fiber, that is, the optical signal is passed (relayed). Optical cross-connect devices (OXC: 100-4 to 7) and these devices 1
00 are connected by an optical fiber 200 that transmits an optical signal at an appropriate multiplicity and transmission speed required for an optical communication network, and the management apparatus NMS 400 sets the path of the optical signal in these apparatuses and optical fibers. It is.

In the present embodiment, the configuration in which the NMS 400 is provided in the optical communication network 10 and the communication path in each device 100 or the optical fiber 200 is set is shown, but any one of the optical signal switching devices 100 is shown.
The device 100 may set each device as a master, or may be configured such that the devices 100 determine communication paths using a communication protocol such as GMPLS, which is being studied by specialized organizations such as IEFT.

An optical signal switching device of the present invention and a method of using an optical communication network using the same are described in terminal A (T011).
A communication from terminal B to terminal B (T101) will be described as an example.
(1) The OADM 100-1 that has received from the optical fiber 300-1 an optical signal (single-layer) to be inserted (added) into the optical communication network 10 from the terminal A (T011), converts the received optical signal into two optical signals. Duplicate. OADM-1 is an optical fiber 200 in which each of the duplexed optical signals is different.
In order to output to the optical signal switching device 100, components such as an optical switch inside the device are controlled, two optical signal paths are set, and two optical signals from the terminal A (T011) are respectively transmitted. Output to different routes (route 0 (R0) and route 1 (R1)).
(2) OADM (100-2, 3, 8, 9) and OXC (100-4-7) existing in the middle
Each passes (relays) the received optical signal toward the OADM 100-10.
It is only necessary to control parts such as an optical switch inside the apparatus and to respond to the optical signal to be transmitted.
One path is set and an optical signal from the terminal A (T011) is output to the OADM 100-10. Specifically, each device 100 on R0 or R1 controls a single optical component to set a route corresponding to R0 or R1.
(3) OADM for dropping an optical signal from the optical communication network 10 to the terminal B (T101)
100-10 transmits two optical signals from terminal A (T011) to different paths R0 and R0, respectively.
1 so that one of the duplexed optical signals is selected and the terminal B (T101
2) is set in advance by controlling components such as an optical switch in the apparatus. The OADM 100-10 performs error detection of each optical signal, correction of the optical signal level, etc. (termination processing) at the duplexed portion in the apparatus, and then selects one optical signal to select the optical fiber 3.
Output to terminal B (T101) via 00-6.

Since the optical signal switching device of the present invention and the optical communication network using the same are configured and operated as described above, the portion in which the optical components are made redundant in order to maintain reliability in the optical signal switching device is the optical communication. Since only a part for inserting / branching an optical signal to the network is required, and the other part may have a single configuration, the number of optical parts is reduced and an economical apparatus is realized. In addition, since the loss of the optical signal is reduced, long-distance transmission is possible. Furthermore, it becomes possible to reduce the number of optical amplifiers inserted on the optical signal path,
An optical communication network with an economical configuration can be provided. In addition, since the optical signals communicated between the terminals are redundantly transmitted in the optical communication network, the reliability can be maintained even if the majority of the optical signal switching device is configured as a single unit.

FIG. 2 is a block diagram showing a configuration example of the optical signal switching device according to the present invention.
The optical signal switching device 100 shown in FIG. 1 realizes OADM and accommodates N optical fibers (200-I1 to IN and 200-O1 to ON) for both input and output.
A plurality of optical signals (for example, n wavelengths) wavelength-multiplexed at 0 are transmitted and received. Moreover, M optical fibers (300-I1 to IM, 300-O1 to OM) are accommodated for both input and output, and optical signals are transmitted to and received from the terminal T connected to the own apparatus. The optical signal switching device 100 includes an optical switch SW (140) to set up an optical signal path, and transmits an optical signal from the terminal T to an optical fiber (200-O1 to ON).
) And inserted into the optical communication network 10 (Add), or optical fiber (200-I1-IN)
Output an optical signal from the optical communication network 10 to the terminal T to drop the optical signal from the optical communication network 10,
An optical signal from the optical fiber (200-I1 to IN) is passed (relayed) to one of the optical fibers (200-O1 to ON). A broken line shown in the SW 140 in FIG. 2 shows an example of setting an optical signal path (Pass, Add, Drop).

Specifically, from the optical fiber PI (200-I1 to IN) to the optical amplifier Amp _I (110-
1 to N) for optical signals (n-wavelength multiplexing) received through the optical demultiplexer DMUX (120-1 to N)
Is demultiplexed for each wavelength (λ _{1 to} λ _n ). A transponder or regenerative repeater IF _PI (130-1--) is provided so that each optical signal (n) of each wavelength after demultiplexing can be easily processed inside the apparatus.
1-130-Nn) for wavelength setting and signal regeneration and supplying to SW 140. The wavelength λ ₀
May have a wavelength within a predetermined wavelength band irrespective of the wavelengths λ _{1 to} λ _n . For example, it can be realized in a 1.3 micrometer band, a 1.5 micrometer band, a 0.85 micrometer band, and the like.

Further, the optical signal from the terminal T connected to the own apparatus received from the optical fiber AD (300-I1 to IM) is duplexed into two optical signals by the optical distributor Bridge (180-1 to M). The transponder or the regenerative repeater IF _ADI (135-10 to M1) converts the wavelength of the optical signal and regenerates it and supplies it to the SW 140. The wavelength λ _A may have a wavelength within a predetermined wavelength band irrespective of the wavelengths λ _{1 to} λ _n . For example, 1.3 μm band, 1.5 μm band, 0.
It can be realized in the 85 μm band or the like. The same wavelength band as the wavelength λ ₀ may be used.

The SW 140 sets a path of an optical signal as indicated by a broken line inside the SW 140 in FIG. 2 based on an instruction from the control system 190. The optical signal received from the optical fiber PI and the optical fiber A
For each of the duplexed optical signals received from D, the received optical signal is output to either optical fiber PO (200-O1-ON) or DR (300-O1-OM) indicated by the control system Set the route as The SW 140 may be a switch that is a combination of, for example, a matrix switch that has already been put into practical use, and there is no limitation of the present invention depending on the configuration of the switch.

The optical signal that has passed through the SW 140 is converted into a transponder or regenerative repeater IF _PO (150
-1-1 to 150-Nn) or IF _ADO (155-10 to M1) for wavelength setting and signal regeneration. The output destination of the optical signal is another optical signal switching device, and the optical fiber PO (200-O
1 to ON) is multiplexed by n wavelengths by the optical multiplexer MUX (160-1 to N), and output through the optical amplifier Amp _O (170-1 to N). Also, the optical signal output destination is the terminal T of its own device, and the optical signal that is one of the optical fibers DR (300-O1 to OM) is a duplexed optical signal having two optical fibers PI and SW140. Therefore, the optical switch Selector (185-1 to 185-1) selectively outputs one of the optical signals. The selection conditions are determined in advance, such as selecting the one with less performance degradation, such as the optical power or the code error rate of the received optical signal, and the configuration in which the control system 190 described later controls the selector 185 or the selector 185 performs autonomous selection. What should I do?

The control system 190 performs monitoring control such as path setting of the optical signal switching device 100, and a memory MEM (1910) that stores an operation program for monitoring control and information for path setting.
Interface I / O for transmitting / receiving monitoring control information to / from each optical component (SW140, etc.)
(1920), a processor CPU (1900) that performs monitoring control of the entire apparatus 100 based on the contents of the MEM 1910 is connected by a bus 1940 or the like. In addition, an interface I / O (1930) for transmitting / receiving monitoring control information to / from the NMS 140 is also provided and connected to the bus 1940. In order to set the optical signal path as shown in FIG.
When the information necessary for setting the SW 140 is notified to each optical signal switching device 100 via the I / O 1930, the control system 190 of each device 100 accumulates this information in the MEM 1910, and CP
The U1900 controls the SW 140 via the I / O 1920 to set an optical signal path as indicated by a broken line of the SW 140 in FIG.

As described above, instead of arranging the NMS 400, any one of the devices 100 in the optical communication network 10 becomes a master to set the route of the other device 100, or each device using a communication protocol defined between the devices 100. It is also possible to adopt a configuration in which the route is determined and set. The configuration of the control system 190 in this case is also substantially the same as the above configuration example. In addition, it is good also as a structure which transmits / receives monitoring control information via the optical fiber 200 instead of providing I / O1930. In this case, the control system 190 transmits and receives the monitoring control information via the I / O 1920 for the outputs of the IFs 130 and 150 and the output of the SW 140.

Note that the transponder or regenerator (130, 135, 15) used in the apparatus 100 is used.
0, 155) may have the same configuration. Also, have been described taking an OADM example, when configuring the OXC, Amp _I 110 to Bridge180 in Figure 2 and DMUX12
0, Selector 185 is replaced with MUX 160 and Amp _O 170, respectively, or Bridge 180, Selector 185, IF _ADI 135, IF _ADO
This can be easily realized by removing 155. The Bridge 180 can be realized by using an optical coupler, a 1 × 2 optical switch, or a 2 × 2 optical switch. Similarly, the selector 185 can be realized by using a 1 × 2 optical switch or a 2 × 2 optical switch.

In the optical signal switching device of the present invention, as described above, the redundant part of the optical component is a part where the optical signal is inserted / branched into the optical communication network, and the other part may have a single configuration. The number of optical components is reduced and an economical device is realized. In addition, the loss of the optical signal is reduced, long-distance transmission is possible, and the reliability of the device itself is improved. Even if most of the optical signal switching device has a single configuration, the reliability of the optical communication network can be maintained because the optical signals communicated between the terminals are made redundant in the optical communication network.

FIG. 3 is a block diagram showing another configuration example of the optical signal switching device of the present invention. The optical signal switching device 100 shown in FIG. 10 is similar to the device 100 shown in FIG.
0-I1-IN, 200-O1-ON) and M optical fibers (300-I1-IM, 30)
0-O1-OM) is accommodated to constitute the OADM. What is different from the apparatus 100 shown in FIG. 2 is the configuration of the SW and internal route setting. These different parts will be described in detail below.

The optical signal switching device 100 uses a plurality (two in this embodiment) of SW145-0 and 145-1 instead of the SW140.
The optical signal received through the optical fiber PI (200-I1 to IN) and transmitted through the device 100 'is SW145-0 or 145-145 as shown by the broken line in SW145 of FIG.
A route is set to one of the SWs 145 and output from the optical fiber PO (200-O1 to ON).

The optical signal branched from the device 100 ′ by the optical signal received by the optical fiber PI (200-I1 to IN) is the Sel via the SW 145-0 and 145-1, respectively.
Two optical signals are received from the two optical fibers PI so that the selector 185 can select them. More specifically, by setting the optical communication network 10 or the optical signal switching device 100 or 100 in the previous stage, a duplexed optical signal is input to each of the SWs 145-0 and 145-1. Then, as indicated by the broken line in the SW 145 of FIG. 3, both the SWs 145-0 and 14
The route is set to 5-1, and one of the optical signals after the termination processing is selected by the selector 185 and output from the optical fiber DR (300-O1 to OM).

An optical signal inserted into the optical communication network 10 from the device 100 'by an optical signal received by the optical fiber AD (300-I1 to IM) is transmitted through the SW145-0 and 145-1 respectively. Output from two optical fibers PO. Specifically, as shown by the broken line in SW145 in FIG. 3, a path is set in both SW145-0 and 145-1, and each of the duplexed optical signals is changed to two different optical fibers PO ( 200-O1-ON).

The configuration of the control system 190 and the configuration of other optical components are the same as those of the optical signal switching device 100 of FIG. Also, OXC can be easily realized by a method similar to the method described in FIG.
In the above description, the duplexed optical signals to be inserted / branched are SW145-0 and 145-1.
However, two routes may be set for one SW. In this case, it is only substantially the same as the configuration / use method of the optical signal switching device 100 of FIG.

According to the optical signal switching device having the configuration shown in FIG. 3, since the SW is distributed, one of the SWs
Even if the device breaks down, one of the optical signals that are inserted / branched can be saved, and a part of the optical signal that passes through (half if it is simply made) can be saved, so the reliability is further improved.

The above-described optical signal switching devices 100 and 100 of the present invention can easily construct a communication network having a flexible configuration that can cope with various transmission speeds and multiplicity of optical signals by appropriately selecting components. is there. For example, STM-0 (51.84 MHz) defined by the ITU-T recommendation
If the optical signal has the above speed, the number of wavelength multiplexing is not limited.

4 and 5 are operation explanatory diagrams for explaining the optical signal switching device of the present invention and the method of using the optical communication network using them.
Hereinafter, the terminal A (T011) connected to the OADM 100-1 to the OADM 100-10
Taking as an example the case where a signal is sent to the terminal B (T101) connected to the optical signal switching device 100
Alternatively, 100, and the path setting operation and apparatus of the optical communication network 10 using these optical signal switching devices and the method of using the optical communication network will be described.

The NMS 400 has status information of the devices 100-1 to 10 such as SW 140 and 145 vacancy, vacancy of each wavelength, optical component failure status, optical signal status (loss level, error rate, etc.), etc. Collected. In addition, status information of the optical fiber 200 is also collected.

The NMS 400 stores the collected state information of the device 100 (100) and the optical fiber 200 in an internal storage device or the like (not shown). When communication from the terminal A (T011) connected to the OADM 100-1 to the terminal B (T101) connected to the OADM 100-10 is required, the NMS 400 connects each device 100 capable of providing a route between the terminals. A path in the communication network 10 is determined by searching for normal (usable) optical components such as SWs 140 and 145, wavelengths used, and fibers available in each device 100 and the optical fiber 200 from the status information of the optical fiber 200. To do. When the two routes R0 and R1 as shown in the route determination result 4000 in FIG. 5 are determined, the NMS 400 sends control information to set the route to each of the optical signal switching devices 100-1 to 10 on the route. Send.

Note that NM (not shown) collects and stores the information, determines the route, and transmits control information to each device.
The processor provided in S400 may be executed by a predetermined algorithm, or the optical communication network 10
May be executed manually using the NMS 400.

When each of the optical signal switching devices 100-1 to 100-10 sets a route inside the device as follows based on the received information, the route between the terminals as shown in FIG. 4 and FIG. Is set and communication is possible.
(1) The OADM 100-1 duplicates the received optical signal into two optical signals, and the optical signals 200-1 (# 1) and 200-3 (#N) are different from each other.
2 and 100-3 so that the optical switch 140 (1
45) is set to set two optical signal paths R0 and R1. If you do this,
The SW140 (145) of the OADM 100-1 and the optical components at the rear stage of the SW only need to have a single configuration, and the number of optical components is small and economical and long-distance transmission with small optical signal loss is possible. This OADM1
Since the optical signal is duplicated at 00-1 and inserted into the optical communication network 10, even if most of the devices provided in the optical communication network 10 have a single configuration, a failure occurs in one of the paths. On the other hand, since it can be saved, the reliability can be maintained.
(2) Each of the OADMs (100-2, 3, 8, 9) and OXCs (100-4 to 7) on the path controls the optical switch 140 (145) based on an instruction from the NMS 400, and determines in FIG. One optical signal path R0 or R1 toward the OADM 100-10 indicated by the result 4000
Set. If such a setting is performed, Amp _I 110 to SW 140 (145) of each device.
-Amp _O 170 is a single configuration. That is, economical long-distance transmission with a small number of optical components and small optical signal loss becomes possible. Even if the apparatus has a single configuration, the reliability can be maintained because two paths are set in the optical communication network 10.
(3) Since the OADM 100-10 receives the optical signal from the two paths R0 and R1 through the optical fibers 200-9 (# 1) and 200-11 (#N), the selector 185 selects one and the terminal B The optical switch 140 (145) is controlled based on the instruction of the NMS 400 so that the paths R0 and R1 of the two optical signals are set so that they can be output to (T101). If such a setting is performed, the optical signal that has been duplicated in the optical communication network 10 is processed, so that reliability can be ensured. The duplex portion of the apparatus 100 (100 ′) is only IF _DRO 155, and the number of optical components is reduced, thereby realizing an economical apparatus.

If the path is set as described above, the optical signal switching device with a small number of optical components and a small optical signal loss is used in which some optical components for inserting / branching optical signals into / from an optical communication network as in the present invention are used in a redundant manner. It becomes possible. Therefore, an optical communication network capable of economical long-distance transmission is provided. Moreover,
Since the optical signal communicated between the terminals is transmitted in a redundant manner within the optical communication network, the reliability can be maintained even if the majority of the optical signal switching device has a single configuration.

  DESCRIPTION OF SYMBOLS 10 ... Optical communication network, 100 ... Optical signal switching apparatus, 110 ... Optical amplifier, 120 ... Optical demultiplexer, 130, 135, 150, 155 ... Transponder or regenerative repeater, 140 , 145 ... Optical switch, 160 ... Optical multiplexer, 170 ... Optical amplifier, 180 ... Optical distributor, 185 ... Optical switch, 190 ... Control system, 200, 300 ..Optical fiber, 400 ... management device.

Claims (1)

An optical communication network in which a plurality of optical signal switching devices are connected by a plurality of optical transmission lines, and optical signals are transmitted and received between the optical signal switching devices,
Each optical signal switching device
A first optical demultiplexer that separates and outputs a wavelength multiplexed optical signal received from the first optical transmission line into an optical signal for each wavelength;
A second optical demultiplexer for separating and outputting the wavelength multiplexed optical signal received from the second optical transmission line into optical signals for each wavelength;
An optical distributor that divides an optical signal received from the third optical transmission line into two optical signals and outputs them;
An optical switch that receives optical signals from the first and second optical demultiplexers and the optical distributor and outputs each optical signal according to a set path;
A first optical multiplexer that receives a plurality of optical signals having different wavelengths from the optical switch, wavelength-multiplexes the input optical signals, and outputs the result to a fourth optical transmission line;
A second optical multiplexer that receives a plurality of optical signals having different wavelengths from the optical switch, wavelength-multiplexes the plurality of input optical signals, and outputs the result to a fifth optical transmission line;
An optical switch that receives two optical signals from the optical switch and outputs any one of the optical signals;
A plurality of transponders or regenerative repeaters that pass optical signals for each wavelength separated and output by the first and second optical demultiplexers;
Two transponders or regenerative repeaters for passing two optical signals divided and output by the optical distributor, and
A plurality of transponders or regenerative repeaters for setting wavelengths for a plurality of optical signals each having a different wavelength output from the optical switch;
A control circuit for setting a path of an optical signal in the optical switch,
The control circuit includes:
One of the two optical signals from the optical distributor is sent to the first optical multiplexer, and the other is sent to the second optical multiplexer.
The optical switch path is set so as to be guided to the optical multiplexer, or the optical signals from the first optical demultiplexer and the second optical demultiplexer are respectively guided to the optical switch one by one. Set the path of the optical switch,
The transponder or the regenerative repeater is set so as to assign a predetermined wavelength for wavelength setting.

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