JP2006186538A - Optical transmission apparatus and method of changing optical transmission line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable it to realize the system change of a transmission line by a wavelength selection light module only by changing the transmitted wavelength of a variable wavelength transmitter/receiver which detects the fault of the transmission line, using a passive optical module with a wavelength selection nature to the protection change of the transmission line. <P>SOLUTION: The variable wavelength transmitters/receivers 5-5n of a node apparatus A3 which detects the barrier of an operational system transmission line 1 inform a detection result to a monitor controller 6. The monitor controller 6 informs wavelength information λj-λjn and a wavelength change request which are not used by a standby system transmission line 2 to the variable wavelength transmitters/receivers 5-5n and variable wavelength transmitters/receivers 7-7n of a node apparatus B4. The variable wavelength transmitters/receivers 5-5n change the wavelength of a signal light which transmits into λj-λjn from λi-λin. Interleavers 9-9n output a signal light from the variable length transmitters/receivers 5-5n to a standby system transmission line 2 through a standby system composite/branch 15 and a standby system optical amplification part 16. The node apparatus B4 receives the wavelength multiplexing light from the standby system transmission line 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a land-type ring-type wavelength division multiplexing transmission system. In particular, when a failure occurs in a transmission line, a highly reliable protection switching is realized by using a passive optical component and a wavelength tunable optical transmitter. It is about the technique to do.

In a ring-type wavelength division multiplexing transmission system, a protection function for a transmission path using a redundant configuration is required so that service can be restored immediately when a transmission path failure occurs. A conventional ring-type wavelength division multiplexing transmission system is a redundant optical transmission system including an optical transceiver, an optical channel inserter, an optical channel splitter, two optical fiber transmission lines, an optical bridge, and an optical switch for selection. A 2 × 1 or 2 × 2 optical switch is applied to the switch, and a single optical coupler is used for the optical bridge to realize protection switching of the transmission line (see, for example, Patent Document 1).
JP 2002-271269 A

  In protection switching of a transmission path in a conventional optical transmission apparatus, a transmitter or a transmitter that transmits and receives an optical signal (also referred to as signal light) to the wavelength multiplexing device between the transmitter and the wavelength multiplexing device, or a transceiver Used an optical switch on the receiving side to receive an optical signal from a wavelength multiplexing device, and switched the transmission path. The switching method is a device composed of an optical switch module, an electric drive circuit, a switching condition detection unit, and a monitoring control unit. After the signal light interruption or signal deterioration is detected by the switching condition detection unit, the monitoring control unit The supervisory control unit notifies the optical switch drive unit of the switching request, and the optical drive circuit of the optical switch controls the optical switch to perform system switching. Therefore, a switching condition detection unit, a monitoring control unit, and an electric drive circuit for an optical switch are required, the circuit scale is increased, complicated signal processing is required, and the number of active components is increased. The problem is that the reliability of the system becomes low.

  The present invention uses a passive optical module having wavelength selectivity that does not require any external control instead of an optical switch for transmission line protection switching, and transmission of a variable wavelength transceiver that detects an abnormality in the transmission line. It is an object of the wavelength selective optical module to realize transmission line system switching only by changing the wavelength. Furthermore, the present invention does not require external electrical processing by using a passive optical module, and performs wavelength switching control closed by a variable wavelength transmitter / receiver, thereby reducing the mounting scale and making it complicated. The purpose of the present invention is to obtain a more reliable ring-type wavelength multiplex transmission system by eliminating signal processing, reducing the number of active components.

The optical transmission device of the present invention is
A transmitter capable of outputting optical signals of different wavelengths;
It has an input port for inputting an optical signal from the transmitter and first and second output ports for outputting an optical signal, and the input optical signal is output from either the first or second output port. A path switching unit having a predetermined output destination according to the wavelength of the optical signal;
A supervisory control unit for outputting a switching signal of the wavelength of the optical signal output by the transmission unit to switch the path in the path switching unit;
A first optical transmission line interface unit that inputs an optical signal from the first output port of the path switching unit and outputs the optical signal to the first optical transmission line;
And a second optical transmission line interface unit that inputs an optical signal from the second output port of the path switching unit and outputs the optical signal to the second optical transmission line.

  According to the present invention, it becomes possible for an optical transmission apparatus to perform transmission line system switching using a passive optical module instead of an optical switch. In addition, according to the present invention, it is possible to obtain a highly reliable ring-type wavelength multiplex transmission system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following first to seventh embodiments are described using a ring type system including two nodes for convenience, but can also be applied to a ring type system including three or more nodes.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 1, the operational transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node device A3 and the node device B4 are optical transmission devices (optical transmission devices or optical reception devices), respectively. It is an example. Further, the variable wavelength transceivers 5 to 5n of the node device A3 are a combination of a transmission unit and an optical reception unit, the interleavers 9 to 9n are path switching units, the operation system multiplexing / demultiplexing unit 13 and the operation system optical amplification unit 14 are the first. The optical transmission line interface unit, the standby multiplexing / demultiplexing unit 15 and the standby optical amplification unit 16 are examples of the second optical transmission line interface unit. The variable wavelength transceivers 7 to 7n of the node device B4 are a combination of a transmission unit and an optical reception unit, the interleavers 11 to 11n are path switching units, the operation system multiplexing / demultiplexing unit 17 and the operation system optical amplification unit 18 are the first. The optical transmission line interface unit, the standby multiplexing / demultiplexing unit 19 and the standby optical amplification unit 20 are examples of the second optical transmission line interface unit.

  In FIG. 1, there are an active transmission line 1 and a standby transmission line 2, and wavelength multiplexed signal light is transmitted from the node device A3 and the node device B4, which are optical transmission devices, to these two transmission lines, respectively. . In the following, the operation of the system when the node device A3 transmits a signal on the active transmission line 1 and the node device B4 receives this signal will be described. However, the signal is transmitted from the node device B4 to the node device A3. The same processing is performed also in the case of In FIG. 1, a solid line indicates a signal transmission form of an active system, and a dotted line indicates a standby system signal transmission form.

  The node device A3 receives the signal light (CL signal) from the client (CL) side (not shown) by the variable wavelength transmitters / receivers 5 to 5n, and the signal light for wavelength multiplexing by the optical / electrical / optical converter (not shown). And then output from the transmitter (Tx). In FIG. 1, oblique arrows on the transmitters and receivers (Rx) of the variable wavelength transceivers 5 to 5n indicate that the wavelength is variable in the variable wavelength transceivers 5 to 5n. The interleavers 9 to 9n each determine in advance whether to output the optical signal from the first or second output port according to the wavelength of the optical signal from the variable wavelength transmitter / receiver 5 to 5n. In this embodiment, the interleavers 9 to 9n sequentially assign channel numbers from the short wavelength to the long wavelength among the optical signals having wavelength intervals suitable for wavelength division multiplexing used by the variable wavelength transceivers 5 to 5n. In some cases, the odd-numbered channel is output to the first output port, and the even-numbered channel is output to the second output port. This interleaver corresponds to a passive optical component that does not require its own dynamic switching operation, whereas a conventional optical switch is a so-called active optical component that switches a path by itself. Here, in the present embodiment, the wavelength of the odd channel is used for the active transmission line 1, and the variable wavelength transmitters / receivers 5 to 5n output the optical signals of the wavelengths λi to λin of the odd channels, respectively, and the interleaver 9 to 9 n output these optical signals from the first output port and input them to the operational multiplexing / demultiplexing unit 13. The light of wavelengths λi to λin input to the operating system multiplexing / demultiplexing unit 13 composed of an arrayed waveguide grating, a dielectric multilayer filter, etc. is multiplexed by the operating system multiplexing / demultiplexing unit 13 and then the operating system Input to the optical amplifying unit 14. The operational optical amplifier 14 amplifies the input wavelength multiplexed light and outputs it to the operational transmission line 1.

  The wavelength division multiplexed light transmitted on the operation system transmission line 1 is received and amplified by the operation system optical amplification unit 18 of the node device B4 which is the opposite station of the node device A3, and then the operation system multiplexing / demultiplexing unit 17 Demultiplexed to each wavelength. Thereafter, the signals are received by the receivers (Rx) of the variable wavelength transmitters / receivers 7 to 7n via the 3 dB couplers 12 to 12n (an example of an optical coupler) and transmitted to the client side.

  When a failure occurs in the operational transmission line 1 during system operation, the variable wavelength transmitter / receiver 5 to 5n and the variable wavelength transmitter / receiver 7 to 7n are, for example, a signal light interruption such as LOS (Loss Of Signal), Alternatively, signal deterioration such as LOF (Loss Of Frame) is detected. In the following, the operation when the variable wavelength transceivers 5 to 5n in the node device A3 detect signal light interruption or signal degradation will be described, but the same processing is also performed in the node device B4.

  The variable wavelength transmitters / receivers 5 to 5n that have detected signal light interruption or signal degradation notify the monitoring control unit 6 of the detection result. The monitoring control unit 6 is not used in the standby transmission line 2 so that the wavelength used for each of the variable wavelength transmitters / receivers 5 to 5n does not overlap from the wavelength map stored in the memory (an example of the storage unit) in advance. The even channel wavelength information λj to λjn is extracted, and the wavelength information λj to λjn and the wavelength switching request are notified to the variable wavelength transceivers 5 to 5n and the variable wavelength transceivers 7 to 7n of the node device B4. At this time, the monitoring control unit 6 communicates with the variable wavelength transceivers 7 to 7n of the node device B4 using, for example, signal light having a wavelength set for monitoring or through a monitoring line connected to the node device B4. I do.

  The variable wavelength transceivers 5 to 5n change the wavelength of the signal light to be transmitted from λi to λin to λj to λjn based on the received wavelength information λj to λjn and the wavelength switching request. Since the output destinations of the interleavers 9 to 9n are determined in advance according to the wavelengths of the input optical signals, the optical signals are output from the second output port connected to the standby system in this case. These signal lights are output as wavelength multiplexed light to the standby transmission line 2 via the standby multiplexing / demultiplexing unit 15 and the standby optical amplification unit 16. In the node device B4, the wavelength multiplexed light from the standby transmission line 2 is received via the standby optical amplifier 20, the standby multiplexing / demultiplexing unit 19, 3 dB couplers 12 to 12n, and variable wavelength transceivers 7 to 7n. The received signal is sent to the client side. In this transmission process / reception process, an optical switch or the like used in the prior art is not necessary.

  As described above, in this embodiment, protection path switching can be realized by using a variable wavelength transmitter / receiver, an interleaver that is a passive optical component, and a 3 dB coupler, and a highly reliable ring-type wavelength division multiplexing is possible. A transmission system can be obtained.

Embodiment 2. FIG.
FIG. 2 is a block diagram showing the configuration of the ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 2, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. Further, the variable wavelength transmitter / receiver 5 of the node device A3 is a combination of a transmitter and an optical receiver, the interleaver 9 is a path switching unit, the operating system multiplexing / demultiplexing unit 13 and the operating system optical amplifying unit 14 are first optical transmission line interfaces. , The standby multiplexing / demultiplexing unit 15 and the standby optical amplification unit 16 are examples of the second optical transmission line interface unit. Further, the variable wavelength transmitter / receiver 7 of the node device B4 is a combination of a transmitter and an optical receiver, the interleaver 11 is a path switching unit, the operating system multiplexing / demultiplexing unit 17 and the operating system optical amplifying unit 18 are first optical transmission line interfaces. , The standby multiplexing / demultiplexing unit 19 and the standby optical amplification unit 20 are examples of the second optical transmission line interface unit.

  In the first embodiment, the monitoring control unit holds the wavelength map, and when a failure occurs in the transmission path, the monitoring control unit determines the wavelength of the standby system and controls wavelength switching. On the other hand, in the present embodiment, as shown in FIG. 2, the variable wavelength transmitter / receiver 5 of the node device A3 and the variable wavelength transmitter / receiver 7 of the node device B4 autonomously perform wavelength switching. At this time, the variable wavelength transmitter / receiver 5 of the node device A3 and the variable wavelength transmitter / receiver 7 of the node device B4 store the wavelength map, set the wavelength that can be changed in advance to the wavelength map, and set the wavelength based on the setting of the wavelength map. (In this case, the variable wavelength transmitter / receiver 5 of the node device A3 and the variable wavelength transmitter / receiver 7 of the node device B4 include a monitoring control unit), and the wavelength switching pattern is determined in advance, and the wavelength is changed. When switching, the wavelength may be changed according to a predetermined order.

  In the present embodiment, with the above configuration, when a failure occurs in the transmission line, the variable wavelength transmitter / receiver autonomously switches the transmission line without requiring a monitoring control unit. Since the transmission line can be monitored and switched only by the variable wavelength transmitter / receiver without using the monitoring controller, high-speed transmission line protection switching can be realized.

Embodiment 3 FIG.
FIG. 3 is a block diagram showing the configuration of the ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 3, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. Further, the variable wavelength transmitter / receiver 5 of the node device A3 is a combination of a transmitter and an optical receiver, the band separator 21 is a path switching unit, the operating system multiplexing / demultiplexing unit 13 and the operating system optical amplifying unit 14 are the first optical transmission. The path interface unit, the standby system multiplexing / demultiplexing unit 15 and the standby system optical amplification unit 16 are examples of the second optical transmission path interface unit. In addition, the variable wavelength transmitter / receiver 7 of the node device B4 is a combination of a transmitter and an optical receiver, the band separator 22 is a path switching unit, the operational multiplexing / demultiplexing unit 17 and the operational optical amplifier 18 are first optical transmissions. The path interface unit, the backup system multiplexing / demultiplexing unit 19 and the backup system optical amplification unit 20 are examples of the second optical transmission path interface unit.

  In the first embodiment, the interleaver selects the transmission line for the operation system or the protection system depending on the wavelength of the signal light to be transmitted. The selection method is, for example, that the operating system is selected if the wavelength of the input signal light is an odd channel, and the standby system is selected if the wavelength is an even channel. On the other hand, in this embodiment, as shown in FIG. 3, the passive band separation unit 21 is used for the node device A3 and the band separation unit 22 is used for the node device B4 instead of the interleaver. The band separation unit 21 of the node device A3 and the band separation unit 22 of the node device B4, for example, separate the wavelength band usable in this system in the vicinity of the center wavelength, and whether the transmitted signal light is in the short wavelength side wavelength band, Either the active or standby transmission line is selected depending on whether it is in the long wavelength band.

  In the present embodiment, with the above configuration, by using a variable wavelength transmitter / receiver, a passive band separation unit, and a 3 dB coupler, it is possible to realize protection switching of a transmission line, and to perform highly reliable ring-type wavelength division multiplexing transmission. A system can be obtained.

Embodiment 4 FIG.
FIG. 4 is a block diagram showing a configuration of the ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 4, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. Further, the variable wavelength transmitter / receiver 5 of the node device A3 is a combination of a transmitter and an optical receiver, the band separator 21 is a path switching unit, the operating system multiplexing / demultiplexing unit 13 and the operating system optical amplifying unit 14 are the first optical transmission. The path interface unit, the standby system multiplexing / demultiplexing unit 15 and the standby system optical amplification unit 16 are examples of the second optical transmission path interface unit. In addition, the variable wavelength transmitter / receiver 7 of the node device B4 is a combination of a transmitter and an optical receiver, the band separator 22 is a path switching unit, the operational multiplexing / demultiplexing unit 17 and the operational optical amplifier 18 are first optical transmissions. The path interface unit, the backup system multiplexing / demultiplexing unit 19 and the backup system optical amplification unit 20 are examples of the second optical transmission path interface unit.

  In the third embodiment, the monitoring control unit holds the wavelength map, and when a failure occurs in the transmission path, the monitoring control unit determines the wavelength of the standby system and controls wavelength switching. On the other hand, in the present embodiment, as shown in FIG. 4, the variable wavelength transmitter / receiver 5 of the node device A3 and the variable wavelength transmitter / receiver 7 of the node device B4 autonomously perform wavelength switching. At this time, the variable wavelength transmitter / receiver 5 of the node device A3 and the variable wavelength transmitter / receiver 7 of the node device B4 store the wavelength map, set the wavelength that can be changed in advance to the wavelength map, and set the wavelength based on the setting of the wavelength map. (In this case, the variable wavelength transmitter / receiver 5 of the node device A3 and the variable wavelength transmitter / receiver 7 of the node device B4 include a monitoring control unit), and the wavelength switching pattern is determined in advance, and the wavelength is changed. When switching, the wavelength may be changed according to a predetermined order.

  In the present embodiment, with the above configuration, when a failure occurs in the transmission line, the variable wavelength transmitter / receiver autonomously switches the transmission line without requiring a monitoring control unit. Since the transmission line can be monitored and switched only by the variable wavelength transmitter / receiver without using the monitoring controller, high-speed transmission line protection switching can be realized.

Embodiment 5. FIG.
FIG. 5 is a block diagram showing a configuration of the ring-type wavelength division multiplexing system according to the present embodiment. In FIG. 5, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. In addition, the active variable wavelength transmitter / receiver 39 of the node device A3 is a combination of a first transmitter and an optical receiver, and the standby variable wavelength transmitter / receiver 27 is a combination of a second transmitter and an optical receiver, and a transmission-side interleaver composite. The unit 23 is a path switching unit, the operating system multiplexing / demultiplexing unit 13 and the operating system optical amplifying unit 14 are the first second optical transmission line interface unit, the standby system multiplexing / demultiplexing unit 15 and the standby system optical amplifying unit 16 are the second. It is an example of a 2 optical transmission line interface part. In addition, the active variable wavelength transmitter / receiver 40 of the node device B4 is a combination of a first transmitter and an optical receiver, and the standby variable wavelength transmitter / receiver 28 is a combination of a second transmitter and an optical receiver, and a transmission side interleaver composite. The unit 25 is a path switching unit, the operating system multiplexing / demultiplexing unit 17 and the operating system optical amplifying unit 18 are first optical transmission line interface units, the standby system multiplexing / demultiplexing unit 19 and the standby system optical amplifying unit 20 are second optical transmission lines. It is an example of an interface part.

  In the first embodiment, each node includes one interleaver for one variable wavelength transceiver. On the other hand, in this embodiment, the interleaver has two input ports and inputs optical signals from two variable wavelength transceivers. As shown in FIG. 5, the active variable wavelength transmitter / receiver 39 and the standby variable wavelength transmitter / receiver 27 of the node device A3 are connected to the input port of the transmission side interleaver composite unit 23 and the output port of the reception side interleaver composite unit 24. The active variable wavelength transmitter / receiver 40 and the standby variable wavelength transmitter / receiver 28 of the node device B4 are connected to the input port of the transmitting interleaver composite unit 25 and the output port of the receiving interleaver composite unit 26.

  In the first embodiment, the signal light transmitted from the variable wavelength transmitter / receiver to the multiplexing / demultiplexing unit is passed through the interleaver, and the signal light received from the variable wavelength transmitter / receiver from the multiplexing / demultiplexing unit is passed through the 3 dB coupler. On the other hand, in the present embodiment, as shown in FIG. 5, a transmission-side interleaver combination unit 23 and a reception-side interleaver combination unit 24 are installed between the variable wavelength transmitter / receiver and the multiplexing / demultiplexing unit of the node device A3. A transmitting-side interleaver combining unit 25 and a receiving-side interleaver combining unit 26 are installed between the variable wavelength transmitter / receiver B4 and the multiplexing / demultiplexing unit. Each transmission-side interleaver composite section includes a 2-input 2-output type interleaver at the input port and a 1-to-2 type 3 dB coupler at the output port. Each reception-side interleaver composite section includes a 1-to-2 type 3 dB coupler at an input port, and a 2-input 2-output type interleaver at an output port.

  The 2-input 2-output type interleaver that is a part of each interleaver composite unit is, for example, an optical signal input from the first input port, the odd channel to the first 3 dB coupler, and the even channel to the second 3 dB coupler. Among the optical signals input from the second input port, the odd-numbered channel is output to the second 3 dB coupler, and the even-numbered channel is output to the first 3 dB coupler. The first 3 dB coupler branches the optical signal from the interleaver into two and outputs it from the first and second output ports, and the second 3 dB coupler branches the optical signal from the interleaver into two and outputs the third, Output from the fourth output port. As a result, when signal light of the same wavelength is input to different input ports, it is possible to output each from a different output port and output it to the active system and the standby system.

  The 3 dB couplers connected to the interleaver that is a part of each interleaver composite unit are respectively the operating system multiplexing / demultiplexing unit 13, the standby system multiplexing / demultiplexing unit 15 of the node device A 3, and the operating system multiplexing / demultiplexing unit of the node device B 4. 17 is connected to a predetermined input port of the standby multiplexing / demultiplexing unit 19. For example, when either one of λi and λj is always selected as the wavelength of the signal light transmitted by the active variable wavelength transmitter / receiver 39 and the standby variable wavelength transmitter / receiver 27, the transmission side interleaver composite unit 23 and the reception are received. The 3 dB coupler of the side interleaver composite unit 24 is connected to the input port corresponding to the wavelength λi and the input port corresponding to the wavelength λj of the active system multiplexing / demultiplexing unit 13 and the standby system multiplexing / demultiplexing unit 15. As described above, each multiplexing / demultiplexing unit has wavelength dependency, and signal light of different wavelengths must be input from different ports, but the transmission wavelength of the variable wavelength transmitter / receiver has been changed by the above configuration. Even in this case, wavelength multiplexing can be performed.

  The operation when the active variable wavelength transmitter / receiver 39 in the node device A3 detects signal light interruption or signal degradation will be described below, but the same processing is also performed in the node device B4.

  Both the transmission wavelength of the active variable wavelength transmitter / receiver 39 and the transmission wavelength of the standby variable wavelength transmitter / receiver 27 are λi. The signal light transmitted by the active system variable wavelength transmitter / receiver 39 is input to the port for wavelength λi of the operating system multiplexing / demultiplexing unit 13 by the transmitting-side interleaver combining unit 23, and the operating system is amplified via the operating system optical amplification unit 14. It is sent to the transmission line 1. The signal light transmitted from the standby system variable wavelength transmitter / receiver 27 is the same wavelength as the transmission wavelength of the active system variable wavelength transmitter / receiver 39, but is transmitted by the transmission side interleaver composite unit 23 for the wavelength λi of the standby system multiplexing / demultiplexing unit 15 Are sent to the standby transmission line 2 via the standby optical amplifier 16.

  When a failure occurs in the active transmission line 1, the active variable wavelength transmitter / receiver 39 detects signal light interruption or signal degradation. When the active variable wavelength transmitter / receiver 39 that detects signal light interruption or signal degradation changes the transmission wavelength to λj, the signal light transmitted by the active variable wavelength transmitter / receiver 39 is transmitted to the standby system by the transmitting interleaver composite unit 23. The signal is input to the port for the wavelength λj of the multiplexing / demultiplexing unit 15 and sent to the standby transmission line 2 via the standby optical amplification unit 16.

  In this way, by changing the transmission wavelength to λj by the active variable wavelength transmitter / receiver 39, transmission side protection switching can be realized by the transmission side interleaver composite unit 23, and the signal of the standby variable wavelength transmitter / receiver 27 is affected. Don't give. Conversely, even when a failure occurs in the standby transmission line 2, the transmission-side interleaver composite unit 23 automatically switches the transmission line by changing the transmission wavelength of the standby variable wavelength transceiver 27 to λj. To implement. At this time, no electrical switching operation by external control is required for the portion forming the redundant configuration, so that highly reliable protection can be realized. Further, since both wavelengths λi and λj are used in the transmission line for the operation system and the standby system, the wavelength band of the transmission line can be effectively utilized.

Embodiment 6 FIG.
FIG. 6 is a block diagram showing a configuration of the ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 6, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. In addition, the active variable wavelength transmitter / receiver 39 of the node device A3 is a combination of the first transmitter and the optical receiver, the standby variable wavelength transmitter / receiver 27 is a combination of the second transmitter and the optical receiver, and the interleaver 9 is the path. The switching unit, the operating system multiplexing / demultiplexing coupler unit 29 and the operating system optical amplification unit 14 are the first optical transmission line interface unit, and the standby system multiplexing / demultiplexing coupler unit 30 and the standby system optical amplification unit 16 are the second optical transmission line interface unit. It is an example. In the node apparatus B4, the active variable wavelength transmitter / receiver 40 is a combination of the first transmitter and the optical receiver, the standby variable wavelength transmitter / receiver 28 is a combination of the second transmitter and the optical receiver, and the interleaver 11 is the path. The switching unit, the operating system multiplexing / demultiplexing coupler unit 32 and the operating system optical amplification unit 18 are the first optical transmission line interface unit, and the standby system multiplexing / demultiplexing coupler unit 31 and the standby system optical amplification unit 20 are the second optical transmission line interface unit. It is an example.

  In the fifth embodiment, the active system multiplexing / demultiplexing unit 13 and the standby system multiplexing / demultiplexing unit 15 are used for the node device A3, and the active system multiplexing / demultiplexing unit 17 and the standby system multiplexing / demultiplexing unit 19 are used for the node device B4. . Since these multiplexing / demultiplexing portions are wavelength-dependent, it is necessary to input signal lights having different wavelengths to different ports. On the other hand, in the present embodiment, a tree coupler module having no wavelength dependency or a multiplexing / demultiplexing coupler unit using a splitter module is used as a port for multiplexing.

  As shown in FIG. 6, in the node device A3, the active variable wavelength transmitter / receiver 39 and the standby variable wavelength transmitter / receiver 27 are connected to the interleaver 9, and the interleaver 9 is connected to the active multiplexer / demultiplexer coupler unit 29 and the standby multiplexed signal. It is connected to the wave coupler unit 30. In the node device B4, the active variable wavelength transmitter / receiver 40 and the standby variable wavelength transmitter / receiver 27 are connected to the interleaver 9, and the interleaver 9 is connected to the active multi / demultiplex coupler unit 32 and the standby multi / demultiplex coupler unit 31. Connected.

  The operation when the active variable wavelength transmitter / receiver 39 in the node device A3 detects signal light interruption or signal degradation will be described below, but the same processing is also performed in the node device B4.

  Both the transmission wavelength of the active variable wavelength transmitter / receiver 39 and the transmission wavelength of the standby variable wavelength transmitter / receiver 27 are λi. The signal light transmitted by the operating system variable wavelength transmitter / receiver 39 is input to the operating system multiplexing / demultiplexing coupler unit 29 by the interleaver 9 and transmitted to the operating system transmission line 1 via the operating system optical amplifier unit 14. The signal light transmitted from the standby system variable wavelength transmitter / receiver 27 is input to the standby system multiplexing / demultiplexing coupler unit 30 by the interleaver 9 while having the same wavelength as the transmission wavelength of the active system variable wavelength transmitter / receiver 39, and the standby system light. The signal is sent to the standby transmission line 2 via the amplifier 16.

  When a failure occurs in the active transmission line 1, the active variable wavelength transmitter / receiver 39 detects signal light interruption or signal degradation. When the active variable wavelength transmitter / receiver 39 that detects signal light interruption or signal degradation changes the transmission wavelength to λj, the signal light transmitted by the active variable wavelength transmitter / receiver 39 is transmitted by the interleaver 9 to the standby multi / demultiplex coupler. The signal is input to the unit 30 and sent to the standby transmission line 2 via the standby optical amplifier 16.

  As described above, the operating system variable wavelength transmitter / receiver 39 changes the transmission wavelength to λj, so that the protection switching of the transmission path can be realized by the interleaver 9, and the signal of the standby system variable wavelength transmitter / receiver 27 is not affected. Conversely, even if a failure occurs in the standby transmission line 2, the interleaver 9 automatically switches the transmission line by changing the transmission wavelength of the standby variable wavelength transmitter / receiver 27 to λj. At this time, no electrical switching operation by external control is required for the portion forming the redundant configuration, so that highly reliable protection can be realized. Further, since both wavelengths λi and λj are used in the transmission line for the operation system and the standby system, the wavelength band of the transmission line can be effectively utilized. In addition, since a multiplexing / demultiplexing coupler unit having no wavelength dependency is used, a simple configuration is possible as compared with the fifth embodiment.

Embodiment 7 FIG.
FIG. 6 is a block diagram showing a configuration of the ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 6, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. In addition, the active variable wavelength transmitter / receiver 39 of the node device A3 is a combination of the first transmitter and the optical receiver, the standby variable wavelength transmitter / receiver 27 is a combination of the second transmitter and the optical receiver, and the interleaver 9 is the path. The switching unit, the operating system multiplexing / demultiplexing coupler unit 29 and the operating system optical amplification unit 14 are the first optical transmission line interface unit, and the standby system multiplexing / demultiplexing coupler unit 30 and the standby system optical amplification unit 16 are the second optical transmission line interface unit. It is an example. In the node apparatus B4, the active variable wavelength transmitter / receiver 40 is a combination of the first transmitter and the optical receiver, the standby variable wavelength transmitter / receiver 28 is a combination of the second transmitter and the optical receiver, and the interleaver 11 is the path. The switching unit, the operating system multiplexing / demultiplexing coupler unit 32 and the operating system optical amplification unit 18 are the first optical transmission line interface unit, and the standby system multiplexing / demultiplexing coupler unit 31 and the standby system optical amplification unit 20 are the second optical transmission line interface unit. It is an example.
FIG. 7 is a block diagram showing a configuration of the ring-type wavelength division multiplexing transmission system according to the present embodiment. In FIG. 7, the active transmission line 1 is a first optical transmission line, the standby transmission line 2 is a second optical transmission line, and the node devices A3 and B4 are examples of optical transmission devices. In addition, the variable wavelength transmitter / receiver 5 of the node device A3 is a combination of the first transmitter and the optical receiver, the fixed wavelength transmitter / receiver 37 is a combination of the second transmitter and the optical receiver, and the transmission side interleaver composite unit 33 is the path. The switching unit, the operating system multiplexing / demultiplexing unit 13 and the operating system optical amplifying unit 14 are examples of the first optical transmission line interface unit, and the standby system multiplexing / demultiplexing unit 15 and the standby system optical amplifying unit 16 are examples of the second optical transmission line interface unit. It is. In the node device B4, the variable wavelength transmitter / receiver 7 is a combination of the first transmitter and the optical receiver, the fixed wavelength transmitter / receiver 38 is a combination of the second transmitter and the optical receiver, and the transmission side interleaver composite unit 35 is the path. The switching unit, the operating system multiplexing / demultiplexing unit 17 and the operating system optical amplifying unit 18 are examples of the first optical transmission line interface unit, and the standby system multiplexing / demultiplexing unit 19 and the standby system optical amplifying unit 20 are examples of the second optical transmission line interface unit. It is.

  In the fifth embodiment, communication can be performed simultaneously on both the active transmission line and the standby transmission line, and when a failure occurs in the active transmission line, the communication on the active transmission line is switched to the standby transmission line, Conversely, when a failure occurs in the standby transmission line, the communication on the standby transmission line is switched to the active transmission line. On the other hand, in the present embodiment, as shown in FIG. 7, each node includes a variable wavelength transmitter / receiver and a fixed wavelength transmitter / receiver, and the variable wavelength transmitter / receiver transmits and receives a WORK signal that is a highly important signal on the client side. The active transmission line 1 is used, and the fixed-wavelength transmitter / receiver uses the standby transmission line 2 that is not used at normal time for transmission / reception of the EXTRA signal, which is a less important signal on the client side.

  The variable wavelength transmitter / receiver 5 and the fixed wavelength transmitter / receiver 37 of the node device A3 are connected to the input port of the transmission side interleaver composite unit 33 and the output port of the reception side interleaver composite unit 34, and are connected to the variable wavelength transmitter / receiver 7 of the node device B4. The fixed wavelength transmitter / receiver 38 is connected to an input port of the transmission side interleaver composite unit 35 and an output port of the reception side interleaver composite unit 36.

  The 2-input 2-output type interleaver, which is a part of each interleaver composite unit, has a function of, for example, dividing an odd channel into an even channel according to an input port and automatically distributing to different output ports. As a result, when signal light of the same wavelength is input to different input ports, each can be output from different output ports.

  The 2-input 2-output type interleaver, which is a part of each interleaver composite unit, has a 3 dB coupler connected to the port connected to the standby system, and each of them is connected to the standby system multiplexing / demultiplexing unit 15 of the node device A3. It is connected to a predetermined port of the standby multiplexing / demultiplexing unit 19 of the device B4.

  In the following, the operation when the variable wavelength transmitter / receiver 5 in the node device A3 detects signal light interruption or signal degradation will be described, but the same processing is also performed in the node device B4.

  A highly important WORK signal is transmitted / received at the wavelength λi in the variable wavelength transmitter / receiver 5 when the active transmission line 1 is normal. If the wavelength λj is assigned in advance for switching the WORK signal to the standby transmission line 2, the EXTRA signal is transmitted and received on the standby transmission line 2 at the wavelength λj in the low-cost fixed wavelength transmitter / receiver 37. .

  The WORK signal transmitted by the variable wavelength transmitter / receiver 5 is input to the port for the wavelength λi of the operating system multiplexing / demultiplexing unit 13 by the transmitting side interleaver combining unit 33, and the operating system transmission line via the operating system optical amplifying unit 14. 1 is sent out. The EXTRA signal transmitted by the fixed wavelength transmitter / receiver 37 is input to the port for the wavelength λj of the standby multiplexing / demultiplexing unit 15 by the transmission-side interleaver combining unit 33, and the backup transmission line via the standby optical amplification unit 16. 2 is sent out.

  When a failure occurs in the active transmission line 1, the variable wavelength transmitter / receiver 5 detects signal light interruption or signal degradation. The variable wavelength transmitter / receiver 5 that detects the signal light interruption or signal degradation notifies the monitoring control unit 6 of the detection result. In order to avoid signal interference, the fixed-wavelength transmitter / receiver 37 that transmits and receives the EXTRA signal interrupts the transmission of the signal light by, for example, stopping the output of a transmission LD (Laser Diode). Thereafter, the variable wavelength transmitter / receiver 5 switches the transmission wavelength of the variable wavelength light source that transmits and receives the WORK signal from λi to λj, performs communication on the standby transmission line, and realizes protection switching.

  In this embodiment, with such a system configuration, transmission line protection switching can be performed for transmission of a highly important signal, and a free wavelength band can be used for transmission of a less important signal. This enables efficient communication at low cost.

The ring-type wavelength division multiplexing transmission system described in the first to seventh embodiments is
In a ring network composed of a plurality of wavelength multiplexing node devices, a variable wavelength transmitter / receiver, a passive optical module unit for selecting a transmission path at a wavelength multiplexing side interface of one variable wavelength transmitter / receiver, and wavelength multiplexing It comprises a multiplexing / demultiplexing unit that performs separation, an optical amplification unit that collectively amplifies wavelength-multiplexed signal light, and a monitoring control unit that performs wavelength information and alarm monitoring in the node device.

The ring-type wavelength division multiplexing transmission system
In a ring network composed of a plurality of wavelength multiplexing node devices, a passive optical module unit for selecting a transmission path at a wavelength multiplexing side interface of one variable wavelength transmitter / receiver and a wavelength division demultiplexing unit Switching control from the wave unit, the wavelength-multiplexed signal light and the supervisory control unit is unnecessary, and after detecting the transmission line alarm, the transmission wavelength is changed independently to realize protection switching A variable wavelength transceiver.

The ring-type wavelength division multiplexing transmission system
In a ring network composed of a plurality of wavelength multiplexing node devices, a variable wavelength transmitter / receiver, a 2 × 2 type interleaver that selects a transmission path at the wavelength multiplexing side interface of two variable wavelength transmitters / receivers, and a wavelength It has a multiplexing / demultiplexing unit that performs demultiplexing and an optical amplifying unit that collectively amplifies wavelength-multiplexed signal light.

The ring-type wavelength division multiplexing transmission system
In a ring network composed of a plurality of wavelength multiplexing node devices, a variable wavelength transmitter / receiver, a fixed wavelength transmitter / receiver, and a 2 × 2 type that selects a transmission path at the wavelength multiplexing side interface of two transmitters / receivers An interleaver, a multiplexing / demultiplexing unit that performs wavelength multiplexing and demultiplexing, and an optical amplifying unit that collectively amplifies wavelength multiplexed signal light.

The optical transmission apparatus described in the first to seventh embodiments is
In an optical transmission device that transmits a plurality of signal lights by wavelength multiplexing,
Set the wavelength of light that can be changed after setting, and a transmitter that transmits signal light of the set wavelength,
A path switching unit that inputs the signal light transmitted by the transmission unit, selects one of a plurality of output destinations according to the wavelength of the input signal light, and outputs the signal light to the selected output destination;
A first multiplexing unit that wavelength-multiplexes the signal light output from the path switching unit to generate wavelength-multiplexed light;
A first optical output unit for outputting the wavelength multiplexed light generated by the first multiplexing unit to the first optical transmission line;
A second multiplexing unit that wavelength-multiplexes the signal light output from the path switching unit to generate wavelength multiplexed light;
And a second optical output unit that outputs the wavelength multiplexed light generated by the second multiplexing unit to the second optical transmission line.

The optical transmission device further includes:
A first optical input unit for inputting wavelength multiplexed light from the first optical transmission line;
A first demultiplexing unit that generates a signal light by wavelength-separating the wavelength multiplexed light input by the first light input unit;
A second optical input unit for inputting wavelength multiplexed light from the second optical transmission line;
A second demultiplexing unit for generating a signal light by wavelength-separating the wavelength multiplexed light input by the second optical input unit;
A path connecting unit that outputs the signal light generated by the first demultiplexing unit and the signal light generated by the second demultiplexing unit;
And an optical receiver that receives the signal light output by the path connection unit.

The optical receiver is
Detecting occurrence of a failure in at least one of the first optical transmission line and the second optical transmission line;
The optical transmission device further includes:
When the optical receiving unit senses the occurrence of the failure, the monitoring unit is configured to instruct the transmitting unit to change the wavelength,
The transmitter is
The wavelength is changed in accordance with an instruction from the monitoring controller, and signal light having the changed wavelength is transmitted.

The optical receiver is
Detecting occurrence of a failure in at least one of the first optical transmission line and the second optical transmission line;
The transmitter is
When the optical receiving unit senses the occurrence of the failure, the wavelength is changed and signal light having the changed wavelength is transmitted.

The optical transmission device is:
Two or more combinations of the transmitter and the optical receiver,
The route switching unit
Input the signal light transmitted by the transmission unit, select one of a plurality of output destinations according to the wavelength of the input signal light and which transmission unit transmitted the signal light, and output the selected signal light Output first,
The path connecting portion is
The signal light generated by the first demultiplexing unit and the signal light generated by the second demultiplexing unit are selected according to the wavelength of the signal light and which demultiplexing unit generates the signal light. The signal light is output to a selected output destination.

The optical transmission device further includes:
A fixed wavelength transmitter that transmits signal light of a predetermined wavelength;
A fixed wavelength receiving unit that receives the signal light output by the path connecting unit,
The route switching unit
Input the signal light transmitted by the fixed wavelength transmitter, and output the input signal light to a predetermined output destination,
The path connecting portion is
Signal light generated by a predetermined demultiplexing unit out of the first demultiplexing unit and the second demultiplexing unit is output to the fixed wavelength receiving unit.

The route switching unit
An interleaver is provided that selects one of the two output ports according to the wavelength of the input signal light and outputs the signal light to the selected output port.

The route switching unit
If the wavelength of the input signal light is a short wave band wavelength, select one of the two output ports, and if the wavelength is a long wave band wavelength, select the other output port, and send the signal light to the selected output port. 5. The optical transmission device according to claim 1, further comprising a band separation unit for outputting.

The path connecting portion is
The signal light generated by the first demultiplexing unit is input from one input port of the two input ports, the signal light generated by the second demultiplexing unit is input from the other input port, and the input signal light It is characterized by having an optical coupler which outputs both from one output destination.

The path connecting portion is
The signal light generated by the first demultiplexing unit is input from one input port of the two input ports, the signal light generated by the second demultiplexing unit is input from the other input port, and the input signal light It has an interleaver that selects one of the two output ports according to the wavelength of and outputs the signal light to the selected output destination.

The optical transmission method described in the first to seventh embodiments is as follows.
In an optical transmission method using an optical transmission device that multiplexes and transmits a plurality of signal lights,
Set the wavelength of light that can be changed after setting, and transmit the signal light of the set wavelength,
A path switching step of inputting the signal light transmitted in the transmission step, selecting one of a plurality of output destinations according to the wavelength of the input signal light, and outputting the signal light to the selected output destination;
A first multiplexing step for generating wavelength multiplexed light by wavelength multiplexing the signal light output in the path switching step;
A first optical output step of outputting the wavelength multiplexed light generated in the first multiplexing step to the first optical transmission line;
A second multiplexing step of generating wavelength multiplexed light by wavelength multiplexing the signal light output in the path switching step;
And a second optical output step of outputting the wavelength multiplexed light generated in the second multiplexing step to the second optical transmission line.

The optical transmission method further includes:
A first optical input step of receiving wavelength multiplexed light from the first optical transmission line;
A first demultiplexing step of generating signal light by wavelength-separating the wavelength multiplexed light received in the first optical input step;
A second optical input step of receiving wavelength multiplexed light from the second optical transmission line;
A second demultiplexing step of generating a signal light by wavelength-separating the wavelength multiplexed light received in the second light input step;
A path connecting step for outputting the signal light generated in the first demultiplexing step and the signal light generated in the second demultiplexing step;
And an optical reception step of receiving the signal light output in the path connection step.

1 is a block diagram showing a configuration of a ring-type wavelength division multiplexing transmission system according to Embodiment 1 of the present invention. The block diagram which shows the structure of the ring-type wavelength division multiplexing transmission system which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of the ring-type wavelength division multiplexing system which concerns on Embodiment 3 of this invention. The block diagram which shows the structure of the ring-type wavelength division multiplexing transmission system which concerns on Embodiment 4 of this invention. The block diagram which shows the structure of the ring-type wavelength division multiplexing transmission system which concerns on Embodiment 5 of this invention. The block diagram which shows the structure of the ring-type wavelength division multiplexing transmission system which concerns on Embodiment 6 of this invention. The block diagram which shows the structure of the ring-type wavelength division multiplexing transmission system which concerns on Embodiment 7 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Operation system transmission line, 2 Backup system transmission path, 3 Node apparatus A, 4 Node apparatus B, 5,7 Variable wavelength transmitter / receiver, 6,8 Monitoring control part, 9,11 Interleaver, 10,12 3dB coupler, 13, 17 Operation system multiplexing / demultiplexing unit, 14, 18 Operation system optical amplification unit, 15, 19 Standby system multiplexing / demultiplexing unit, 16, 20 Standby system optical amplification unit, 21, 22 Band separation unit, 23, 25, 33, 35 Transmission side interleaver composite unit, 24, 26, 34, 36 Reception side interleaver composite unit, 39, 40 Operation system variable wavelength transceiver, 27, 28 Standby system variable wavelength transceiver, 29, 32 Operation system multiplexing / demultiplexing coupler unit, 30, 31 Preliminary multiplexing / demultiplexing coupler unit, 37, 38 Fixed wavelength transmitter / receiver.

Claims (11)

A transmitter capable of outputting optical signals of different wavelengths;
It has an input port for inputting an optical signal from the transmitter and first and second output ports for outputting an optical signal, and the input optical signal is output from either the first or second output port. A path switching unit having a predetermined output destination according to the wavelength of the optical signal;
A supervisory control unit for outputting a switching signal of the wavelength of the optical signal output by the transmission unit to switch the path in the path switching unit;
A first optical transmission line interface unit that inputs an optical signal from the first output port of the path switching unit and outputs the optical signal to the first optical transmission line;
An optical transmission apparatus comprising: a second optical transmission line interface unit that inputs an optical signal from the second output port of the path switching unit and outputs the optical signal to a second optical transmission line. The transmission unit is capable of outputting optical signals having different wavelengths at wavelength intervals suitable for wavelength division multiplexing transmission, and a plurality of the transmission units are provided.
A plurality of the path switching units are provided corresponding to the plurality of transmission units,
The monitoring control unit can output a wavelength switching signal to the plurality of transmission units,
The first optical transmission line interface unit inputs the optical signal from the first output port of each of the plurality of path switching units and outputs a multiplexed first optical signal to the first optical transmission line,
The second optical transmission line interface unit inputs the optical signal from the second output port of each of the plurality of path switching units and outputs a second multiplexed optical signal multiplexed to the second optical transmission line. The optical transmission device according to claim 1, wherein: In the path switching unit, an output destination corresponding to each wavelength of a wavelength interval suitable for wavelength multiplexing transmission is predetermined,
The monitoring control unit includes a storage unit that stores in advance an output destination corresponding to each of the wavelengths by the path switching unit, and based on monitoring information on either the first or second optical transmission line, 3. The optical transmission device according to claim 1, wherein a switching signal for instructing a switching wavelength is output to a corresponding transmission unit with reference to an output destination corresponding to each of the stored wavelengths.   4. The optical transmission device according to claim 3, wherein the supervisory control unit outputs a switching signal to a corresponding transmission unit and notifies the receiving side device of the switching wavelength via an optical transmission path.   5. The light according to claim 1, wherein the path switching unit is a predetermined interleaver so as to be alternately output to the first and second output ports at predetermined wavelength intervals. Transmission equipment.   5. The optical transmission according to claim 1, wherein the path switching unit is predetermined to be separated into a long wave side wavelength band and a short wave side wavelength band in the vicinity of a center of a wavelength band to be handled. apparatus.   The supervisory control unit is an optical receiving unit that receives an optical signal transmitted through the first and second optical transmission lines, and the light of the received optical signal from either the first or second optical transmission line 5. The optical transmission device according to claim 1, wherein a switching signal for instructing a switching wavelength is output to the transmission unit based on either strength or quality. First and second transmitters capable of outputting optical signals having different wavelengths;
First and second input ports for inputting optical signals from the first and second transmission units, a branching unit for branching optical signals from the first and second input ports, and first to first optical signals for outputting optical signals. A path switching unit having a fourth output port, and an output destination corresponding to the wavelength of the optical signal and the input port to determine whether the optical signal is output from any of the first to fourth output ports; ,
A monitoring control unit that outputs a switching signal of the wavelength of the optical signal output by either of the first and second transmission units in order to switch the path in the path switching unit;
A first interface side first and second input ports for inputting optical signals from the first and second output ports of the path switching unit, and a first interface side output port for outputting optical signals to the first optical transmission line; A first optical transmission line interface unit comprising:
Second interface side first and second input ports for inputting optical signals from the third and fourth output ports of the path switching unit, and a second interface side output port for outputting optical signals to the second optical transmission line; An optical transmission device comprising: a second optical transmission line interface unit including: First and second transmitters capable of outputting optical signals having different wavelengths at wavelength intervals suitable for wavelength division multiplexing;
The first and second input ports for inputting optical signals from the first and second transmitters, and the first and second output ports for outputting optical signals, and the input optical signals are the first, A path switching unit in which an output destination corresponding to a wavelength and an input port for output from which of the second output ports is determined;
A monitoring control unit that outputs a switching signal of the wavelength of the optical signal output by either of the first and second transmission units in order to switch the path in the path switching unit;
A first optical transmission line interface unit that inputs an optical signal from the first output port of the path switching unit and outputs the optical signal to the first optical transmission line;
An optical transmission apparatus comprising: a second optical transmission line interface unit that inputs an optical signal from the second output port of the path switching unit and outputs the optical signal to a second optical transmission line. A first transmitter capable of outputting optical signals having different wavelengths at wavelength intervals suitable for wavelength division multiplexing;
A second transmitter that outputs an optical signal having a predetermined wavelength;
The first and second input ports for inputting the optical signal from the first and second transmission units and the branching unit for branching one of the optical signals from the first and second input ports and the optical signal are output. Path switching having a first to a third output port, and an output destination corresponding to the wavelength and the input port from which of the first to third output ports the input optical signal is output And
A supervisory control unit for outputting a switching signal of the wavelength of the optical signal output by the first transmission unit for switching the path in the path switching unit;
A first optical transmission line interface unit that inputs an optical signal from the first output port of the path switching unit and outputs the optical signal to the first optical transmission line;
An optical transmission apparatus comprising: a second optical transmission line interface unit that inputs an optical signal from either the second or third output port of the path switching unit and outputs the optical signal to a second optical transmission line . A transmission unit capable of switching the wavelength of an optical signal to be transmitted, and a path switching unit in which an optical signal from the transmission unit is output to a plurality of optical transmission lines according to the wavelength of the optical signal. And a monitoring control unit that has a storage unit that stores an output destination corresponding to the wavelength by the path switching unit and instructs switching of the wavelength of the optical signal output from the transmission unit based on monitoring information of the optical transmission path In an optical transmission line switching method for switching an optical transmission line operated between an optical transmission apparatus and an optical reception apparatus connected via the plurality of optical transmission lines,
The supervisory control unit refers to an output destination corresponding to the wavelength of the path switching unit stored in the storage unit based on monitoring information of the optical transmission path in operation, and issues a wavelength switching instruction for switching to another optical transmission path Output to the transmitter,
The transmitter outputs an optical signal whose wavelength is switched based on the wavelength switching instruction,
An optical transmission path switching method, wherein an optical signal whose wavelength is switched by the path switching section is output to the other optical transmission path.

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