WO2024053012A1 - Communication system and control method - Google Patents

Abstract

One aspect of the present invention comprises: an acquisition unit that acquires a wavelength set in a user terminal; an optical sorting unit that outputs an optical signal to at least one output designation among a plurality of output destinations; an observation unit that observes the wavelength of a signal outputted from the user terminal to the optical sorting unit or the wavelength of a signal outputted from the optical sorting unit to the user terminal; and a cutoff unit that, if the wavelength observed by the observation unit is different from the wavelength acquired by the acquisition unit, cuts off communication with the user terminal or cuts off a frequency component having the observed wavelength.

Description

Communication system and control method

The present invention relates to a communication system and a control method technology.

There is IOWN (Innovative Optical and Wireless Network), which eliminates photoelectric conversion and electrical routing processing as much as possible. User devices in the APN (All-Photonics Network) of IOWN shown in FIG. 19 communicate using wavelengths and routes set in the Ph-GW (Photonic Gateway). The wavelength and route set by the Ph-GW may be specified by the APN controller, for example.

The exchange of wavelength and route information is performed using, for example, a control signal channel called AMCC (auxiliary management and control channel) when the user equipment starts communication. At the start of communication, the user device and the control function unit located in the Ph-GW communicate with each other, and are connected to an arbitrary communication destination.

Ph-GW has five functions. The first is a wavelength control/monitoring function that specifies and controls which wavelength the user equipment uses and monitors the wavelength of the signal. The second is a pass/stop function that allows signals to pass when a path opens and stops unnecessary signals. The third function is to condense the optical signals of the wavelength set in each user equipment and transfer them to the relay network as necessary, and to distribute the optical signals transferred from the relay network to each wavelength as necessary and send them to the user equipment. This is a line concentration/distribution function that transfers lines to The fourth is a loopback function that enables loopback at the Ph-GW to which the optical signal is input without transferring it to a relay network. The fifth is an extraction/insertion function for performing playback, relay, and electrical processing.

The Ph-GW has the function of controlling a remotely located TPND (Transponder) and is a ROADM (Reconfigurable optical add-drop multiplexer) that does not have a TPND, or has the function of controlling a remote TPND and itself It can be regarded as a TPA (TPND Aggregator, transponder aggregation switch) that constitutes a ROADM without a TPND. Four types of structural examples of ROADM will be explained.

FIG. 20 is a diagram showing a first configuration example of the ROADM or a part thereof. Configuration example 1 includes an M×1 WSS 9012 with an M×1 configuration, a 1×N combiner/brancher 9021 with a 1×N configuration, an N×1 WSS 9010 with an N×1 configuration, and a 1×M WSS 9011 with a 1×M configuration. Note that WSS is Wavelength Selective Switch.

The M×1 WSS 9012 receives an M route signal from the user network interface (hereinafter referred to as “UNI”) side. The M×1 WSS 9012 multiplexes signals input from the UNI side according to the combination of input ports and wavelengths, and outputs the multiplexed signals to the 1×N combiner/brancher 9021. The combiner/brancher 9021 branches the signal input from the M×1 WSS 9012 into N paths, and outputs the signal to N paths on the network interface (hereinafter referred to as "NNI") side.

The N×1 WSS 9010 receives N-way signals from the NNI side. The N×1 WSS 9010 multiplexes signals input from the NNI side according to the combination of input ports and wavelengths, and outputs the multiplexed signals to the 1×M WSS 9011. The 1×M WSS 9011 outputs the signal from the N×1 WSS 9010 to the M path on the UNI side according to the wavelength.

This configuration example 1 has a Colorless function and a Directionless function, but does not have a Contentionless function. Colorless function is a function that changes the combination of wavelength and port so that the signal path inside the node is not restricted by the signal wavelength (= color) by adding a variable wavelength function to the multiplexing/demultiplexing filter. It is. The Directionless function is a function that freely sets the direction of the transponder input/output route using a transponder aggregation switch configuration in which two WSSs are connected facing each other. Contentionless function avoids collisions within the transponder aggregation switch of the same wavelength signals connected to different routes by using a WSS with an N×M configuration that has multiple ports for each input and output and sets arbitrary paths between them. This is a function to

FIG. 21 is a diagram showing configuration example 2. Configuration 2 is a configuration using two upper and lower MCSs (Multicast Switches). The first MCS of configuration example 2 includes M 1×N optical switches 9113 and N M×1 combiners/branchers 9111, and the other MCS includes N 1×M combiners/branchers 9112. , and M N×1 optical switches 9114. In the first MCS, each of the 1×N optical switches 9113 receives one route of signals from the UNI side. The 1×N optical switch 9113 outputs the signal input from the UNI side to either the M×1 combiner/brancher 9111. The M×1 combiner/brancher 9111 multiplexes the signals input from the 1×N optical switch 9113 and outputs the multiplexed signals to each one route on the NNI side.

In another MCS, each of the 1×M combiner/branchers 9112 receives one route of signals from the NNI side. The 1×M combiner/brancher 9112 branches the signal input from the NNI side and outputs it to the N×1 optical switch 9114. The N×1 optical switch 9114 selects the signal from the 1×M combiner/brancher 9112 according to the input port, and outputs it to each one route on the UNI side. This configuration example 2 has a Colorless function, a Directionless function, and a Contentionless function. Note that in configuration example 2, an amplifier is usually required to compensate for MCS loss due to branching.

FIG. 22 is a diagram showing configuration example 3. Configuration example 3 includes an M×N WSS 9201 and an N×M WSS 9202. The M×N WSS 9201 receives an M route signal from the UNI side. The M×N WSS9201 outputs a signal input from the UNI side to one of N routes on the NNI side depending on the combination of input port and wavelength. The N×M WSS 9202 receives N-way signals from the NNI side. The N×M WSS 9202 outputs the signal input from the NNI side to one of the M routes on the UNI side depending on the combination of input port and wavelength. Configuration example 3 has a Colorless function, a Directionless function, and a Contentionless function.

FIG. 23 is a diagram showing configuration example 4. Configuration example 4 includes an M×N optical switch 9302, an AWG (Arrayed-Waveguide Grating) 9303, an AWG 9313, and an N×M optical switch 9312. The M×N optical switch 9302 receives M-way signals from the UNI side. The M×N optical switch 9302 outputs a signal input from the UNI side to any port of any AWG 9303 depending on the input port. The AWG 9303 multiplexes the signals input from the M×N optical switch 9302 according to the combination of input ports and wavelengths, and outputs the multiplexed signals to the NNI side. The AWG 9313 outputs each signal input from the NNI side to one of the N ports of the N×M optical switch 9312 depending on the combination of input port and wavelength. The N×M optical switch 9312 outputs the signal input from the AWG 9313 to the M path on the UNI side according to the input port.

A Ph-GW can be configured using each of the configuration examples 1 to 4 described above or a part thereof. Further, the Ph-GW can be configured using components without wavelength selectivity such as MCS.

In the Ph-GW, if the user terminal uses only the wavelength set by the APN controller, it must be transmitted, and if an inappropriate wavelength that has not been set is used, it must be blocked. However, some of the above configuration examples and configurations other than Configuration Example 4 have a problem in that signals of inappropriate wavelengths cannot be blocked.

In view of the above circumstances, the present invention aims to provide a technique for blocking signals of inappropriate wavelengths.

One aspect of the present invention includes: an acquisition unit that acquires a wavelength set in a user terminal; an optical distribution unit that outputs an optical signal to at least one of a plurality of output destinations; an observation section that observes the wavelength of a signal input to the section or the wavelength of a signal output from the optical distribution section to the user terminal; and the wavelength observed by the observation section is the wavelength acquired by the acquisition section. and a cutoff unit that cuts off input from the user terminal or output to the user terminal or cuts off a wavelength component different from the acquired wavelength when the wavelength is different from the obtained wavelength.

One aspect of the present invention is a control method for a communication system including an optical distribution unit that outputs an optical signal to at least one of a plurality of output destinations, the acquisition method acquiring a wavelength set in a user terminal. an observation step of observing the wavelength of a signal input from the user terminal to the optical distribution unit or the wavelength of a signal output from the optical distribution unit to the user terminal; and a wavelength observed by the observation step. is different from the wavelength obtained in the obtaining step, a blocking step of blocking input from the user terminal or output to the user terminal, or blocking a wavelength component different from the obtained wavelength. This is a control method.

According to the present invention, it is possible to provide a technique for suppressing conduction of signals of inappropriate wavelengths.

FIG. 1 is a configuration diagram showing a communication system according to the present embodiment. FIG. 3 is a diagram illustrating a configuration example of a Ph-GW according to the first embodiment. It is a figure which shows the alternative structure of SA. FIG. 7 is a diagram illustrating a configuration example of a Ph-GW according to a second embodiment. FIG. 7 is a diagram showing a configuration example of a Ph-GW according to a third embodiment. FIG. 7 is a diagram showing a configuration example of a Ph-GW according to a fourth embodiment. It is a diagram showing an example of the configuration of Ph-GW according to the fifth embodiment. FIG. 7 is a diagram showing an example of the configuration of a Ph-GW according to a sixth embodiment. FIG. 12 is a diagram showing a configuration example of a Ph-GW according to a seventh embodiment. FIG. 7 is a diagram showing an example of the configuration of a Ph-GW according to an eighth embodiment. 3 is a flowchart showing the flow of processing common to each embodiment. FIG. 2 is a diagram showing an example of a configuration in which a separation section 21 is configured using FBG (Fiber Bragg Grating). 2 is a diagram illustrating a configuration example in which a separation unit 21 is configured using a TFF (Thin Film Filter). FIG. 2 is a diagram illustrating a configuration example in which a separation unit 21 is configured using an AWG (Arrayed-Waveguide Grating). FIG. 7 is a diagram illustrating a configuration example of a separation unit 21 configured using a modified example of an AWG. FIG. FIG. 3 is a diagram showing a specific example of a separation section 21 configured using a reflection type diffraction grating. 3 is a diagram illustrating an example of a configuration in which a separation section 21 is configured using a waveguide ring resonator. FIG. 3 is a diagram illustrating a configuration example in which a separation section 21 is configured using a lattice type optical filter. FIG. FIG. 2 is a diagram illustrating user equipment in an APN. FIG. 2 is a diagram showing a first configuration example of a ROADM. It is a figure which shows the example 2 of a structure of ROADM. It is a figure which shows the example 3 of a structure of ROADM. It is a figure which shows the example 4 of a structure of ROADM.

FIG. 1 is a configuration diagram showing a communication system 1 according to the present embodiment. The communication system 1 includes an APN (All-Photonics Network) controller (also referred to as "APNC") 10, control function units 20-1, 20-2, Ph-GWs 30-1, 30-2, and a user device 100. Ru. The control function units 20-1 and 20-2 are expressed as a control function unit 20 unless they are specifically distinguished from each other. The control function unit 20 controls the Ph-GW autonomously or according to instructions from the APNC 10, and sets a path for the Ph-GW. The Ph-GW controls the user equipment according to instructions from the autonomous or control function unit 20 or the APNC 10. For example, the wavelengths for transmission and reception are controlled. The control function unit 20 or the APNC 10 may directly control the user device 100. In that case, the control function unit 20 or the APNC 10 may include an AMCC transceiver in order to transmit and receive control signals to and from the user device 100, for example, when AMCC is used as the control signal. Ph-GW30-1 and 30-2 are expressed as Ph-GW30 unless they are particularly distinguished.

The user device 100 connects to the Ph-GW 30. The user device 100 exchanges information with the Ph-GW 30 via the control function unit 20, for example. At this time, the control function section may be part of the Ph-GW 30.

The Ph-GW 30 is connected to the control function section 20. Note that if the control function unit 20 is a part of the Ph-GW 30, the user device 100 may also be able to communicate with the control function unit 20 by connecting to the Ph-GW 30. In the configuration shown in FIG. 1, the user device 100 uses a control signal, for example, a control signal on AMCC, to exchange a control signal for managing and controlling communication with the Ph-GW when starting communication. , the wavelength used for communication, etc. are set. At the time of setting, the Ph-GW 30 sets a path through which the control function unit 20 and the user device 100 can communicate. After the setting is completed, the Ph-GW 30 sets a path through which the user device 100 can communicate with the opposing communication device, for example, another user device.

The Ph-GW30 mainly has five functions. The first is a wavelength control/monitoring function that specifies and controls which wavelength the user equipment 100 uses and monitors the wavelength of the signal. The second is a pass/stop function that allows signals to pass when a path opens and stops unnecessary signals. The third function is to condense optical signals of wavelengths set in each user equipment and transfer them to the relay network, and to distribute optical signals transferred from the relay network for each wavelength. The fourth is a loopback function that enables loopback at the Ph-GW 30 to which the optical signal is input. The fifth is an extraction/insertion function for performing regenerative relay and electrical processing.

The Ph-GW 30 can be configured using various parts. Hereinafter, each configuration example will be explained, and an embodiment will be described in which communication is blocked or an observed wavelength component is blocked in the configuration example.

(First embodiment)
FIG. 2 is a diagram showing a configuration example of the Ph-GW 30-1 according to the first embodiment. In the first embodiment, a Ph-GW to which the configuration example 2 described in the prior art is applied will be described. The Ph-GW 30-1 includes, for example, two MCSs 200 and 300 in the upstream and downstream directions, a cutoff control unit 400, an observation optical switch 500, M combiners/branches 230, and M combiners/branches 330. . The combiner/brancher is a power splitter or optical coupler without wavelength dependence. An optical switch may be used instead of the combiner/brancher.

The signal from the UNI side is input to the combiner/brancher 230. The combiner/brancher 230 outputs the signal input from the UNI side to the MCS 200 and the observation optical switch 500. The signal from the MCS 300 is input to the combiner/brancher 330 . The combiner/brancher 330 outputs the signal input from the MCS 300 to the user equipment 100 connected to the UNI side and the observation optical switch 500.

For example, signals are input to the observation optical switch 500 from the combiner/brancher 230 and the combiner/brancher 330 in a time-division manner. The observation optical switch 500 outputs the signals input from the combiner/brancher 230 and the combiner/brancher 330 to the cutoff controller 400 . When a signal is input in a time-sharing manner as described above, the cutoff control unit 400 determines from which combiner/ brancher 230 or 330 the signal was input, depending on the time at which the signal was input. can be determined.

The cutoff control unit 400 acquires the wavelength set in the user terminal 100 from the Ph-GW 30. The cutoff control unit 400 includes an SA (spectrum analyzer) 410. The cutoff control unit 400 cuts off communication with the user terminal 100 when the wavelength observed by the SA 410 is different from the wavelength acquired from the APN controller 10. The cutoff control unit 400 causes the 1×N optical switch 220 or the N×1 optical switch 320 to block the signals determined to have different wavelengths.

Note that, instead of the 1×N optical switch 220 or the N×1 optical switch 320, the disconnection is performed on the path from the user device to the 1×N optical switch 220 or the path from the N×1 optical switch 320 to the user device. It is equipped with a separate functional unit for 1×N optical switch 220 or N×1 optical switch 320 to receive a disconnection instruction from 400, and to disconnect instead of 1×N optical switch 220 or N×1 optical switch 320. You may. This also applies to subsequent embodiments.

The MCS 200 includes M 1×N optical switches 220 and N M×1 combiners/branchers 210. Each of the 1×N optical switches 220 receives one route of signals from the UNI side input from the combiner/brancher 230 . The 1×N optical switch 220 outputs a signal input from the UNI side to one of the M×1 combiner/branchers 210, or blocks a signal instructed by the cutoff control unit 400. The M×1 combiner/brancher 210 multiplexes the signals input from the 1×N optical switch 220 and outputs the multiplexed signals to each one route on the NNI side.

The MCS 300 includes N 1×M multiplexers 310 and M N×1 optical switches 320. The 1×M combiner/brancher 310 receives one route of signals from the NNI side. The 1×M combiner/brancher 310 branches the signal input from the NNI side and outputs it to the N×1 optical switch 220. The N×1 optical switch 320 selects the signal from the 1×M combiner/brancher 310 according to the input port, and outputs each signal to one combiner/brancher 330, or cuts off the signal instructed by the cutoff control unit 400. do.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 230, and one SA is provided for one combiner/brancher 330, so that each SA is input from the corresponding combiner/ brancher 230 or 330. The wavelength of the signal may also be observed. In this case, the observation optical switch 500 and the SA 410 in the cutoff control section 400 become unnecessary. The cutoff control unit 400 also determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and sends a signal to the 1×N optical switch 220 or the N×1 optical switch 320 according to the determination result. Instruct to shut off.

The combiner/brancher 230 and the combiner/brancher 330 may be an optical switch that switches the output between the cutoff control unit 400 and the 1×N optical switch 220, or an optical switch that switches the output between the observation optical switch 500 and the UNI side. The combiner/brancher 230 and the observation optical switch 500 may be optical switches that switch outputs to the 1×N optical switch 220 and the cutoff control unit 400. The combiner/brancher 330 and the observation optical switch 500 may be optical switches that switch the output to the UNI side and the cutoff control unit 400. This also applies to subsequent embodiments.

In the first embodiment, the MCSs 200 and 300 are examples of light distribution units. The 1×N optical switch 220 and the N×1 optical switch 320 are examples of the cutoff section. The combiner/brancher 230 and the combiner/brancher 330 are examples of branching parts. The cutoff control unit 400 is an example of an observation unit. The observation optical switch 500 is an example of another light distribution section.

FIG. 3 is a diagram showing an alternative configuration of SA 410. FIG. 3 shows the observation optical switch 500 and the alternative SA 411 described above. The alternative SA 411 includes a function of demultiplexing for each wavelength to be discriminated, for example, an AWG 413, and a plurality of detection units 412 that detect the intensity of each wavelength demultiplexed by the demultiplexing function. The AWG 413 is an example of a demultiplexer, and may be any device that demultiplexes input signals according to their wavelengths. In the case of AWG413, signals are output from different ports for each wavelength. A detection unit 412 is provided and connected to each port.

By checking whether the detection unit 412 outputs a signal input from the observation optical switch 500 at a port corresponding to a wavelength other than that set in the user terminal 100, it can be determined whether an incompatible wavelength is being output, for example. , can be observed using time division multiplexing.

Note that in order to prevent wavelength components from being blocked by the multiplexer/demultiplexer and not detected, a demultiplexer with large crosstalk between adjacent channels, that is, between adjacent ports may be used. In that case, calibrate crosstalk between adjacent ports.

By configuring as shown in FIG. 3, unlike a spectrum analyzer, it does not require time to sweep the wavelength, so compared to the case where the wavelength is swept, the measurement processing time required for measurement can be shortened. This shortening is particularly suitable when multiple UNIs or NNIs share the SA in a time-sharing manner.

(Second embodiment)
FIG. 4 is a diagram showing a configuration example of the Ph-GW 30-2 according to the second embodiment. In the second embodiment, a Ph-GW to which the configuration example 1 described in the prior art is applied will be described. The Ph-GW30-2 includes an M×1 WSS600 with an M×1 configuration, a 1×N combiner/brancher 610 with a 1×N configuration, an N×1 WSS710 with an N×1 configuration, a 1×M WSS720 with a 1×M configuration, It includes a cutoff control unit 1400, an observation optical switch 1500, M combiners/branchers 1230, and M combiners/branches 1330.

The signal from the UNI side is input to the combiner/brancher 1230. The combiner/brancher 1230 outputs the signal input from the UNI side to the M×1 WSS 600 and the observation optical switch 1500. The signal from the 1×M WSS 720 is input to the combiner/brancher 1330. The combiner/brancher 1330 outputs the signal input from the 1×M WSS 720 to the user equipment 100 connected to the UNI side and the observation optical switch 1500.

Signals are input to the observation optical switch 1500 from the combiner/brancher 1230 and the combiner/brancher 1330 in a time-division manner, for example. The observation optical switch 1500 outputs the signals input from the combiner/brancher 1230 and the combiner/brancher 1330 to the cutoff control section 1400. When a signal is input in a time-sharing manner as described above, the cutoff control unit 1400 determines from which combiner/brancher 1230 or combiner/brancher 1330 the signal was input, depending on the time at which the signal was input. can be determined.

The cutoff control unit 1400 acquires the wavelength assigned to the user terminal 100 from the APN controller 10. The cutoff control unit 1400 includes an SA 1410. The cutoff control unit 1400 cuts off communication with the user terminal 100 when the wavelength observed by the SA 1410 is different from the wavelength acquired from the APN controller 10. The blocking control unit 1400 blocks the signals determined to have different wavelengths by using the M×1 WSS 600, the N×1 WSS 710, or the 1×M WSS 720.

In addition, instead of either M×1 WSS600 or N×1 WSS710 and 1×M WSS720, the cutoff can be performed by using the route from the user device to M×1 WSS600 or the route from the NNI side to N×1 WSS710 and 1× A separate function unit for blocking is provided on either of the routes from the M WSS720 to the user device, and the function unit receives a blocking instruction from the 1400 in place of either the M×1 WSS600 or the N×1 WSS710 and 1×M WSS720. , M×1 WSS 600 or N×1 WSS 710 and 1×M WSS 720 may be blocked. This also applies to subsequent embodiments.

The M×1 WSS 600 receives the M route signal from the UNI side input from the combiner/brancher 1230. The M×1 WSS 600 multiplexes signals input from the UNI side according to the combination of input ports and wavelengths, and outputs them to the 1×N combiner/brancher 610 or outputs the signals input from the UNI side according to the combination of input ports and wavelengths specified by the cutoff control unit 1400. Block the combined signal. The 1×N combiner/brancher 610 branches the signal input from the M×1 WSS 600 into N paths, and outputs the signals to the N paths on the NNI side.

The N×1 WSS 710 receives N-way signals from the NNI side. The N×1 WSS710 multiplexes the signals input from the NNI side according to the combination of input ports and wavelengths, and outputs the signals to the 1×M WSS720, or the signal of the input port and wavelength combination instructed by the cutoff control unit 1400. cut off. The 1×M WSS 720 outputs the signal from the N×1 WSS 710 to M multiplexers/branchers 1330 according to the wavelength, or blocks the signal of the output port and wavelength combination instructed by the blocking control unit 1400.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 1230, and one SA is provided for one combiner/brancher 1330, so that each SA is input from the corresponding combiner/brancher 1230 or combiner/brancher 1330. The wavelength of the signal may also be observed. In this case, the observation optical switch 1500 and the SA 410 in the cutoff control section 1400 become unnecessary. In addition, the cutoff control unit 1400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and selects M×1 WSS600, N×1 WSS710, or 1×M WSS720 according to the determination result. Instructs to cut off the signal.

In the second embodiment, the combination of M×1 WSS 600 and 1×N combiner/brancher 1230 and the combination of N×1 WSS 710 and 1×M WSS 720 are examples of the optical distribution section. The M×1 WSS600, the N×1 WSS710, and the 1×M WSS720 are examples of the cutoff unit. The combiner/brancher 1330 is an example of a branch section. The cutoff control unit 1400 is an example of an observation unit. The observation optical switch 1500 is an example of another light distribution section.

(Third embodiment)
FIG. 5 is a diagram showing a configuration example of the Ph-GW 30-3 according to the third embodiment. In the third embodiment, a Ph-GW to which the configuration example 3 described in the prior art is applied will be described. The Ph-GW 30-3 includes an M×N WSS 1600, an N×M WSS 1720, a cutoff control section 2400, an observation optical switch 2500, M combiners/branches 2230, and M combiners/branches 2330.

The signal from the UNI side is input to the combiner/brancher 2230. The combiner/brancher 2230 outputs the signal input from the UNI side to the M×N WSS 1600 and the observation optical switch 2500. The signal from the N×M WSS 1720 is input to the combiner/brancher 2330. The combiner/brancher 2330 outputs the signal input from the N×M WSS 1720 to the user equipment 100 connected to the UNI side and the observation optical switch 2500.

Signals are input to the observation optical switch 2500 from the combiner/brancher 2230 and the combiner/brancher 2330 in a time-division manner, for example. The observation optical switch 2500 outputs the signals input from the combiner/brancher 2230 and the combiner/brancher 2330 to the cutoff control section 2400. When a signal is input in a time-sharing manner as described above, the cutoff control unit 2400 determines from which combiner/ brancher 2230 or 2330 the signal was input, depending on the time at which the signal was input. can be determined.

The cutoff control unit 2400 acquires the wavelength assigned to the user terminal 100 from the APN controller 10. Shutdown control section 2400 includes SA1410. The cutoff control unit 2400 cuts off communication with the user terminal 100 when the wavelength observed by the SA 1410 is different from the wavelength acquired from the APN controller 10. The blocking control unit 2400 causes the M×N WSS 1600 or the N×M WSS 1720 to block signals determined to have different wavelengths.
Note that the blocking is performed by installing a blocking functional unit in either the path from the user device to the M×N WSS1600 or the path from the N×M WSS1720 to the user device, instead of the M×N WSS1600 or the N×M WSS1720. It may be provided separately and receive a shutoff instruction from 2400 instead of M×N WSS1600 or N×M WSS1720 to shut off instead of M×N WSS1600 or N×M WSS1720. This also applies to subsequent embodiments.

The M×NWSS 1600 receives the M route signal from the UNI side input from the combiner/brancher 2230. The M×NWSS 1600 outputs the signal input from the UNI side to any of the N routes on the NNI side depending on the combination of port and wavelength, or outputs the signal of the input port and wavelength combination instructed by the cutoff control unit 2400. cut off.

The N×M WSS 1720 receives N-way signals from the NNI side. The N×M WSS 1720 outputs the signal input from the NNI side to M combiners/branchers 2330 according to the input port and wavelength combination, or outputs the signal of the port and wavelength combination instructed by the cutoff control unit 2400. Cut off.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 2230, and one SA is provided for one combiner/brancher 2330, so that each SA is input from the corresponding combiner/ brancher 2230 or 2330. The wavelength of the signal may also be observed. In this case, the observation optical switch 2500 and the SA 410 in the cutoff control section 2400 are unnecessary. In addition, the cutoff control unit 2400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and instructs the M×N WSS 1600 or N×M WSS 1720 to block the signal depending on the determination result. do.

In the third embodiment, the M×N WSS 1600 and the N×M WSS 1720 are examples of a light distribution unit. M×N WSS 1600 and N×M WSS 1720 are examples of the cutoff unit. The combiner/brancher 2230 and the combiner/brancher 2330 are examples of branching parts. The cutoff control unit 2400 is an example of an observation unit. The observation optical switch 2500 is an example of another light distribution section.

(Fourth embodiment)
FIG. 6 is a diagram showing a configuration example of the Ph-GW 30-4 according to the fourth embodiment. In the fourth embodiment, a Ph-GW to which the fourth configuration example described in the prior art is applied will be described. The Ph-GW30-4 includes an M×N optical switch 800, an AWG810, an AWG910, an N×M optical switch 900, a cutoff control section 3400, an observation optical switch 3500, M combiners/branches 3230, and M combiners/branches. container 3330.

The signal from the UNI side is input to the combiner/brancher 3230. The combiner/brancher 3230 outputs the signal input from the UNI side to the M×N optical switch 800 and the observation optical switch 3500. The signal from the N×M optical switch 900 is input to the combiner/brancher 3330 . The combiner/brancher 3330 outputs the signal input from the N×M optical switch 900 to the user device 100 connected to the UNI side and the observation optical switch 3500.

Signals are input to the observation optical switch 3500 from the combiner/brancher 3230 and the combiner/brancher 3330 in a time-division manner, for example. The observation optical switch 3500 outputs the signals input from the combiner/brancher 3230 and the combiner/brancher 3330 to the cutoff control section 3400. When a signal is input in a time-division manner as described above, the cutoff control unit 3400 determines which combiner/brancher 3230 or combiner/brancher 3330 the signal was input from, depending on the time when the signal was input. can be determined.

The cutoff control unit 3400 acquires the wavelength assigned to the user terminal 100 from the APN controller 10. The cutoff control unit 3400 includes an SA 3410. The cutoff control unit 3400 cuts off communication with the user terminal 100 when the wavelength observed by the SA 3410 is different from the wavelength acquired from the APN controller 10. The cutoff control unit 3400 causes the M×N optical switch 800 or the N×M optical switch 900 to cut off signals determined to have different wavelengths.
Note that, instead of the M×N optical switch 800 or the N×M optical switch 900, the disconnection can be performed by separately providing a function unit for disconnection on the path from the user device to the NNI side or from the NNI side to the user device. In place of the M×N optical switch 800 or the N×M optical switch 900, a cutoff instruction may be received from the switch 3400, and the cutoff may be performed in place of either the M×N optical switch 800 or the N×M optical switch 900. This also applies to subsequent embodiments.

The M×N optical switch 800 receives the M route signal from the UNI side input from the combiner/brancher 3230. The M×N optical switch 800 outputs a signal input from the UNI side to any port of any AWG 810 depending on the input port, or shuts off the signal of the port instructed by the cutoff control unit 3400. The AWG 810 multiplexes the signals input from the M×N optical switch 800 according to the combination of input ports and wavelengths, and outputs the multiplexed signals to the NNI side.

The AWG 910 outputs each signal input from the NNI side to one of the N ports of the N×M optical switch 900 depending on the combination of input port and wavelength. The N×M optical switch 900 outputs the signal input from the AWG 910 to one of the M combiners/branchers 3330 depending on the input port, or cuts off the signal of the port instructed by the cutoff control unit 3400.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 3230, and one SA is provided for one combiner/brancher 3330, so that each SA is input from the corresponding combiner/ brancher 3230 or 3330. The wavelength of the signal may also be observed. In this case, the observation optical switch 3500 and the SA 410 in the cutoff control section 3400 become unnecessary. In addition, the cutoff control unit 3400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and sends a signal to the M×N optical switch 800 or the N×M optical switch 900 according to the determination result. Instruct to shut off. Note that the AWG 810 and AWG 910 may be other than AWG as long as they can separate wavelengths or multiplex multiple wavelengths.

In the fourth embodiment, the M×N optical switch 800 and the N×M optical switch 900 are examples of a light distribution unit. The M×N optical switch 800 and the N×M optical switch 900 are examples of the cutoff section. The combiner/brancher 3230 and the combiner/brancher 3330 are examples of branching parts. The cutoff control unit 3400 is an example of an observation unit. The observation optical switch 3500 is an example of another light distribution section.

(Fifth embodiment)
FIG. 7 is a diagram showing a configuration example of the Ph-GW 30-5 according to the fifth embodiment. The fifth embodiment is a modification of the first embodiment, and the main change is that a wavelength filter is provided. The Ph-GW 30-5 includes two MCSs 1200 and 1300, a cutoff control unit 4400, an observation optical switch 4500, M combiners/branchers 4230, M combiners/branches 4330, filter optical switches 960, 970, 990, and wavelength filters 950 and 980.

In the following embodiments, one wavelength filter is illustrated in each of the upstream and downstream directions, but there may be a plurality of wavelength filters. In the case of multiple ports, the number of ports added to the WSS, combiner/brancher, and optical switch is increased according to the number.

The signal from the UNI side is input to the combiner/brancher 4230. The combiner/brancher 4230 outputs the signal input from the UNI side to the MCS 1200 and the observation optical switch 4500. The signal from the MCS 1300 is input to the combiner/brancher 4330. The combiner/brancher 4330 outputs the signal input from the MCS 1300 to the user equipment 100 connected to the UNI side and the observation optical switch 4500.

Signals are input to the observation optical switch 4500 from the combiner/brancher 4230 and the combiner/brancher 4330 in a time-division manner, for example. The observation optical switch 4500 outputs the signals input from the combiner/brancher 4230 and the combiner/brancher 4330 to the cutoff control section 4400. When a signal is input in a time-division manner as described above, the cutoff control unit 4400 determines which combiner/brancher 4230 or combiner/brancher 4330 the signal was input from, depending on the time when the signal was input. can be determined.

The cutoff control unit 4400 obtains the wavelength assigned to the user terminal 100 from the APN controller 10. The cutoff control unit 4400 includes an SA4410. If the wavelength observed by the SA 4410 is different from the wavelength acquired from the APN controller 10, the cutoff control unit 4400 transmits the signals determined to have different wavelengths to the wavelength filter 950 and the wavelength filter 980. input. The wavelength filter 950 and the wavelength filter 980 are variable wavelength filters, and the wavelengths are set so that only the set wavelengths are transmitted. The signals that have passed through the wavelength filter 950 are outputted to the filter optical switch 960 after filtering the signals that are considered to have different wavelengths into the signals that are not considered to have different wavelengths. The signal that has passed through the wavelength filter 980 is output to the filter optical switch 970. The output of the filter optical switch 960 from the UNI side to the NNI side is output to the (M+1)×1 combiner/brancher 1210, and the output of the filter optical switch 970 from the NNI side to the UNI side is not output. It is input to the power(N+1)×1 optical switch 1320. In the figure, the input is input to the (N+1)×1 optical switch 1320, but instead of inputting to the (N+1)×1 optical switch 1320, the multiplexer/brancher 4330 that each of the N×1 optical switches 1320 outputs is input to the (N+1)×1 optical switch 1320. You may change the combiner/brancher to a 2×2 combiner/brancher and input it. In this case, the scale of the 1320 switches is reduced from (N+1)×1 to N×1. This also applies to subsequent embodiments.

The MCS 1200 includes M (N+1)×1 optical switches 1220 and N (M+1)×1 combiners/branchers 1210. Each of the 1×(N+1) optical switches 1220 receives one route of signals from the UNI side input from the combiner/brancher 4230. The 1×(N+1) optical switch 1220 outputs the signal input from the UNI side to either the (M+1)×1 combiner/brancher 1210 and the wavelength filter 950. The wavelength filter 950 blocks the wavelength instructed by the blocking control section 4400. The signal that has passed through the wavelength filter 950 is output to a filter optical switch 960. The filter optical switch 960 outputs the signal output from the wavelength filter 950 to the (M+1)×1 combiner/brancher 1210. The (M+1)×1 combiner/brancher 1210 multiplexes the signal input from the 1×N optical switch 1220 and the signal input from the filter optical switch 960, and outputs the multiplexed signal to one path on the NNI side.

The MCS 1300 includes N 1×(M+1) combiners/branchers 1310 and M (N+1)×1 optical switches 1320. Each of the 1×(M+1) combiner/branchers 1310 receives one route of signals from the NNI side. The 1×(M+1) combiner/brancher 1310 branches the signal input from the NNI side and outputs it to the (N+1)×1 optical switch 1320 and the filter optical switch 990. The filter optical switch 990 outputs the signal input from the NNI side to the wavelength filter 980. The wavelength filter 980 blocks the wavelength instructed by the blocking control unit 4400. The signal that has passed through the wavelength filter 980 is output to the filter optical switch 970. (N+1)×1 optical switch 1320 outputs the signal from 1×(M+1) combiner/brancher 1310 to combiner/brancher 4330.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 4230, and one SA is provided for one combiner/brancher 4330, so that each SA is input from the corresponding combiner/ brancher 4230 or 4330. The wavelength of the signal may also be observed. In this case, the observation optical switch 4500 and the SA 4410 in the cutoff control section 4400 are unnecessary. Further, the cutoff control unit 4400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and instructs the wavelength filter 950 or the wavelength filter 980 to cut off the signal depending on the determination result. Note that an optical switch that selects the signal output from the 1×(N+1) optical switch 1220 may be provided before the wavelength filter 950.

In the fifth embodiment, the MCSs 1200 and 1300 are examples of light distribution units. The (N+1)×1 optical switch 1220 and the 1×(M+1) combiner/brancher 1310 are examples of cutoff units. Combiner/brancher 4230 and combiner/brancher 4330 are examples of branching parts. The cutoff control unit 4400 is an example of an observation unit. The observation optical switch 4500 is an example of another light distribution section.
(Sixth embodiment)
FIG. 8 is a diagram showing a configuration example of the Ph-GW 30-6 according to the sixth embodiment. The sixth embodiment is a modification of the second embodiment, and the main change is that a wavelength filter is provided. Ph-GW30-6 includes M×2 WSS2600, 2×N combiner/brancher 1610, N×2 WSS1710, 2×M WSS2720, cutoff control unit 5400, observation optical switch 4500, M combiner/branchers 5230, M multiplexer/brancher 5330 and wavelength filters 1950 and 1980.

The signal from the UNI side is input to the combiner/brancher 5230. The combiner/brancher 5230 outputs the signal input from the UNI side to the M×2 WSS 2600 and the observation optical switch 4500. The signal from the 2×M WSS 2720 is input to the combiner/brancher 5330. The combiner/brancher 5330 outputs the signal input from the 2×M WSS 2720 to the user equipment 100 connected to the UNI side and the observation optical switch 4500.

Signals are input to the observation optical switch 4500 from the combiner/brancher 5230 and the combiner/brancher 5330 in a time-division manner, for example. The observation optical switch 4500 outputs the signals input from the combiner/brancher 5230 and the combiner/brancher 5330 to the cutoff control section 5400. When a signal is input in a time-sharing manner as described above, the cutoff control unit 5400 determines from which combiner/brancher 5230 or combiner/brancher 5330 the signal was input, depending on the time at which the signal was input. can be determined.

The cutoff control unit 5400 acquires the wavelength set in the user terminal 100 from the Ph-GW 30. The cutoff control unit 5400 includes an SA5410. When the wavelength observed by the SA 5410 is different from the set wavelength, the cutoff control unit 5400 causes the wavelength filter 1950 or the wavelength filter 1980 to block the wavelength component determined to have a different wavelength.

The M×2 WSS 2600 receives the M route signal from the UNI side input from the combiner/brancher 5230. The M×2 WSS 2600 multiplexes signals input from the UNI side according to the combination of input ports and wavelengths, and outputs the multiplexed signals to the 2×N combiner/brancher 1610 and wavelength filter 1950. The wavelength filter 1950 blocks the wavelength instructed by the blocking control section 5400. Wavelength filter 1950 outputs a signal to 2×N combiner/brancher 1610. The 2×N combiner/brancher 1610 branches the signal input from the M×2 WSS 2600 and the signal input from the wavelength filter 1950 into N paths, and outputs them to the N paths on the NNI side.

The N×2 WSS 1710 receives N-way signals from the NNI side. The N×2 WSS 1710 multiplexes the signals input from the NNI side and outputs the multiplexed signals to the 2×M WSS 2720 and the wavelength filter 1980. The wavelength filter 1980 outputs only signals whose combinations of input ports and wavelengths are incompatible. The wavelength filter 1980 blocks the wavelength instructed by the blocking control unit 5400. The wavelength filter 1980 outputs a signal to the 2×M WSS 2720. The 2×M WSS 2720 outputs the signal from the N×2 WSS 1710 and the signal from the wavelength filter 1980 to M multiplexers/branchers 5330 according to wavelengths.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 5230, and one SA is provided for one combiner/brancher 5330, so that each SA is input from the corresponding combiner/ brancher 5230 or 5330. The wavelength of the signal may also be observed. In this case, the observation optical switch 4500 and the SA 410 in the cutoff control unit 5400 are not required. In addition, the cutoff control unit 5400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and depending on the determination result, the wavelength component of the inappropriate wavelength is applied to the wavelength filter 1950 or the wavelength filter 1980. Instruct to shut off.

In the sixth embodiment, the combination of M×2 WSS2600 and 2×N combiner/brancher and the combination of N×2 WSS1710 and 2×M WSS2720 are examples of the optical distribution section. The wavelength filter 1950 and the wavelength filter 1980 are examples of a blocking section. The combiner/brancher 5330 is an example of a branch section. The cutoff control unit 5400 is an example of an observation unit. The observation optical switch 4500 is an example of another light distribution section.

(Seventh embodiment)
FIG. 9 is a diagram showing a configuration example of the Ph-GW 30-7 according to the seventh embodiment. The seventh embodiment is a modification of the third embodiment, and the main change is that a wavelength filter is provided. Ph-GW30-7 includes (M+1)×(N+1)WSS3600, (N+1)×(M+1)WSS3720, cutoff control unit 6400, observation optical switch 5500, M combiners/branches 6230, M combiners/branches 6330 and wavelength filters 2950 and 2980.

The signal from the UNI side is input to the combiner/brancher 6230. The combiner/brancher 6230 outputs the signal input from the UNI side to the (M+1)×(N+1) WSS 3600 and the observation optical switch 5500. The signal from the (N+1)×(M+1) WSS 3720 is input to the combiner/brancher 6330. The combiner/brancher 6330 outputs the signal input from the (N+1)×(M+1) WSS 3720 to the user equipment 100 connected to the UNI side and the observation optical switch 5500.

Signals are input to the observation optical switch 5500 from the combiner/brancher 6230 and the combiner/brancher 6330 in a time-division manner, for example. The observation optical switch 5500 outputs the signals input from the combiner/brancher 6230 and the combiner/brancher 6330 to the cutoff control section 6400. When a signal is input in a time-sharing manner as described above, the cutoff control unit 6400 determines from which combiner/brancher 6230 or combiner/brancher 6330 the signal was input, depending on the time when the signal was input. can be determined.

The cutoff control unit 6400 acquires the wavelength assigned to the user terminal 100 from the APN controller 10. The cutoff control section 6400 includes an SA6410. The cutoff control unit 6400 cuts off communication with the user terminal 100 when the wavelength observed by the SA 6410 is different from the wavelength acquired from the APN controller 10. The cutoff control unit 6400 causes the wavelength filter 2950 or the wavelength filter 2980 to block wavelength components of wavelengths determined to be different wavelengths.

The (M+1)×(N+1) WSS 3600 receives the M route signal from the UNI side input from the combiner/brancher 6230 and the signal output from the wavelength filter 2950. The (M+1)×(N+1) WSS 3600 outputs the signal input from the UNI side to either the N direction on the NNI side or the wavelength filter 2950 depending on the combination of input port and wavelength. The wavelength filter 2950 blocks the wavelength instructed by the blocking control unit 6400.

The (N+1)×(M+1) WSS 3720 receives the N-way signal and the wavelength filter 2980 signal from the NNI side. (N+1)×(M+1) WSS3720 outputs the signal input from the NNI side and the signal input from wavelength filter 2980 to M combiners/branchers 6330 and wavelength filters 2980 according to the combination of input ports and wavelengths. . The wavelength filter 2980 blocks the wavelength instructed by the blocking control section 6400.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 6230, and one SA is provided for one combiner/brancher 6330, so that each SA is input from the corresponding combiner/ brancher 6230 or 6330. The wavelength of the signal may also be observed. In this case, the observation optical switch 5500 and the SA 6410 in the cutoff control section 6400 become unnecessary. Furthermore, the cutoff control unit 6400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and instructs the wavelength filter 2950 or the wavelength filter 2980 to cut off the wavelength component according to the determination result. .

In the seventh embodiment, (M+1)×(N+1)WSS 3600 and (N+1)×(M+1)WSS 3720 are examples of the light distribution unit. The wavelength filter 2950 and the wavelength filter 2980 are examples of a blocking section. The combiner/brancher 6230 and the combiner/brancher 6330 are examples of branching parts. The cutoff control unit 6400 is an example of an observation unit. The observation optical switch 5500 is an example of another light distribution section.

(Eighth embodiment)
FIG. 10 is a diagram showing a configuration example of the Ph-GW 30-8 according to the eighth embodiment. The eighth embodiment is a modification of the fourth embodiment, and the main change is that a wavelength filter is provided. Ph-GW30-8 includes (M+1)×(N+1) optical switch 1800, AWG1810, AWG1910, (N+1)×(M+1) optical switch 1900, cutoff control unit 7400, observation optical switch 6500, and M number of combiners/branchers. 7230, M multiplexers/branchers 7330, and wavelength filters 3950, 3980.

The signal from the UNI side is input to the combiner/brancher 7230. The combiner/brancher 7230 outputs the signal input from the UNI side to the (M+1)×(N+1) optical switch 1800 and the observation optical switch 6500. The signal from the (N+1)×(M+1) optical switch 1900 is input to the combiner/brancher 7330. The combiner/brancher 7330 outputs the signal input from the (N+1)×(M+1) optical switch 1900 to the user equipment 100 connected to the UNI side and the observation optical switch 6500.

Signals are input to the observation optical switch 6500 from the combiner/brancher 7230 and the combiner/brancher 7330 in a time-division manner, for example. The observation optical switch 6500 outputs the signals input from the combiner/brancher 7230 and the combiner/brancher 7330 to the cutoff control section 7400. When a signal is input in a time-sharing manner as described above, the cutoff control unit 7400 determines from which combiner/brancher 7230 or combiner/brancher 7330 the signal was input, depending on the time when the signal was input. can be determined.

The cutoff control unit 7400 acquires the wavelength set in the user terminal 100 from the Ph-GW 30. The cutoff control section 7400 includes an SA7410. When the wavelength observed by the SA 7410 is different from the wavelength acquired from the APN controller 10, the blocking control unit 7400 causes the wavelength filter 3950 or the wavelength filter 3980 to block the wavelength component determined to have a different wavelength.

The M×N optical switch 1800 receives the M-way signal from the UNI side input from the combiner/brancher 7230 and the signal output from the wavelength filter 3950. (M+1)×(N+1) optical switch 1800 outputs a signal input from the UNI side to any port of any AWG 1810 and wavelength filter 3950 depending on the input port. The AWG 1810 multiplexes signals input from the (M+1)×(N+1) optical switch 1800 according to the combination of input ports and wavelengths, and outputs the multiplexed signals to the NNI side. The wavelength filter 3950 blocks the wavelength instructed by the blocking control section 7400.

The AWG 1910 outputs each signal input from the NNI side to one of the N ports of the (N+1)×(M+1) optical switch 1900 depending on the combination of input port and wavelength. The (N+1)×(M+1) optical switch 1900 outputs the signal input from the AWG 1910 to one of M combiners/branchers 7330 and wavelength filters 3980 depending on the input port. The wavelength filter 3980 blocks the wavelength instructed by the blocking control section 7400. Wavelength filter 3980 outputs a signal to (N+1)×(M+1) optical switch 1900.

In this way, by observing the wavelength of the signal input from the user terminal 100 or the wavelength of the signal output to the user terminal 100, it is possible to block signals with inappropriate wavelengths. Note that one SA is provided for one combiner/brancher 7230, and one SA is provided for one combiner/brancher 7330, so that each SA is input from the corresponding combiner/brancher 7230 or combiner/brancher 7330. The wavelength of the signal may also be observed. In this case, the observation optical switch 6500 and the SA 410 in the cutoff control section 7400 become unnecessary. In addition, the cutoff control unit 7400 determines whether the wavelength is inappropriate based on the wavelength observed in each SA, and depending on the determination result, the (M+1)×(N+1) optical switch 1800 or (N+1)× (M+1) Instructs the optical switch 1900 to block the wavelength component determined to be an inappropriate wavelength.

In the eighth embodiment, the (M+1)×(N+1) optical switch 1800 and the (N+1)×(M+1) optical switch 1900 are examples of the optical distribution unit. The wavelength filters 3950 and 3980 are examples of blocking sections. The combiner/brancher 7230 and the combiner/brancher 7330 are examples of branch parts. The cutoff control unit 7400 is an example of an observation unit. The observation optical switch 6500 is an example of another light distribution section.

FIG. 11 is a flowchart showing the flow of processing common to each of the embodiments described above. In FIG. 11, the cutoff control unit acquires the wavelength assigned to the user terminal (step S101). Next, the SA observes the wavelength of the signal output from the user terminal to the optical switch or the wavelength of the signal output from the optical switch to the user terminal (step S102). The wavelength control unit determines whether the observed wavelength is different from the acquired wavelength (step S103). If the observed wavelength is different from the acquired wavelength (step S103: YES), the blocking control unit blocks communication with the user terminal or blocks the wavelength component of the observed wavelength (step S104). . If the observed wavelength is not different from the acquired wavelength (step S103: NO), the cutoff control unit ends the process.

In the embodiment described above, the configuration for detecting the intensity of the wavelength component (light intensity) has been described using FIG. 3, but another example of the configuration for detecting the light intensity will be described using the drawings. In the configuration described below, a configuration including a separation section and a detection section, or a configuration related to a separation section and a detection section is shown. The separation unit performs separation processing for wavelength-separating the input optical signal, the desired signal, and the residual signal. By executing the separation process, the desired separation signal and the residual separation signal are separated in wavelength.
Here, the desired separation signal is a signal with a predetermined wavelength component, and the residual separation signal is a signal with a wavelength component other than the predetermined wavelength component that should be detected and blocked by the detection unit, and the signal light is input from the second side. However, on the first side, the desired separation signal is output, and the remaining separation signal is terminated at the detection section.

The detection unit detects the optical intensity of the separated residual separation signal. When the detection unit detects the residual separation signal at a predetermined optical intensity or higher, it outputs a control signal for blocking or filtering the input optical signal. In this case, the detection unit may record information (log) indicating that the residual separation signal was detected at a predetermined light intensity or higher. The detection unit may be configured to be non-reflective. That is, the detection section may be configured not to reflect the input from the separation section. Such a log may be recorded along with the detection time of the residual separation signal. By recording a log in this manner, for example, when an inquiry occurs, it becomes possible to appropriately respond to the inquiry. Further, such a log may be recorded together with the detected intensity, or may be recorded together with the detected time and intensity.

FIG. 12 is a diagram showing a configuration example in which the separation section 21 is configured using FBG (Fiber Bragg Grating). FBGs are constructed by carving a diffraction grating into an optical fiber. When light enters the FBG, only light with a specific wavelength component depending on the spacing between the diffraction gratings is reflected, and light with other wavelength components passes through. By utilizing such characteristics, it is possible to configure the separation section 21 using FBG.

The separation unit 21 includes a circulator 211 and an FBG 212. The circulator 211 inputs the optical signal input from the second side to the FBG 212 . The circulator 211 outputs the optical signal input from the FBG 212 to the first side. The circulator 211 may be configured using a combiner/brancher, for example. When the circulator 211 is configured using a 2×2 combiner/brancher, two ports on one side function as an input port and an output port, one of the two ports on the opposite side is connected to the FBG 212, and the other port functions as an input port and an output port. The port is configured with reflection-free termination. The circulator 211 may be constructed using a 2×1 combiner and splitter so that there are no open ends. In this case, two ports on one side function as an input port and an output port, and one port on the opposite side is connected to the FBG 212. The FBG 212 reflects the desired separation signal and transmits the remaining separation signal.

In FIG. 12, the FBG 212 corresponds to the duplexer. The wavelength to be detected is adjusted by the tension and temperature applied to this FBG filter 212.

FIG. 13 is a diagram showing a configuration example in which the separation section 21 is configured using TFF. The separation unit 21 includes a circulator 211 and a TFF 214. The circulator 211 inputs the optical signal input from the second side to the TFF 214 . The circulator 211 inputs the optical signal input from the TFF 214 to the detection unit 22 .

The direction in which light travels through the circulator 211 differs depending on whether the elements in the separation section 21 are configured to reflect the desired separation signal, such as the FBG 212, or are configured to transmit the desired separation signal, such as the TFF 214. rotates in the opposite direction.

The TFF 214 transmits the desired separation signal and reflects the remaining separation signal optical signal. The residual separation signal reflected by the TFF 214 is input to the detection unit 22 via the circulator 211.

The TFF 214 corresponds to a duplexer. The wavelength to be detected is adjusted by changing the incident angle from the circulator 211 to the TFF 214 or the film thickness of the TFF 214.

FIG. 14 is a diagram showing a configuration example in which the separation section 21 is configured using an AWG. The separation section 21 includes an AWG 215. The AWG 215 outputs the optical signal input from the second side from a port according to the wavelength. Among the plurality of output ports of the AWG 215, the output port to which the desired separation signal is output is connected to the first side. It is desirable that all remaining output ports be connected to the detection section 22. This is to prevent failure to detect the residual separation signal. The input to the detection unit 22 may be multiplexed using a multiplexer/demultiplexer such as an AWG. An isolator may be provided between the separation section 21 and the detection section 22. The isolator may be provided, for example, between the AWG 215 and the multiplexer/demultiplexer. In this case, the cost increases because the number of isolators increases, but a higher effect can be obtained.

In FIG. 14, a single-input AWG is used, but a multiple-input AWG may be used. In that case, to reduce the effects of reflection, unused ports should be terminated without reflection or connected with an isolator.

In FIG. 14, the AWG 215 corresponds to the duplexer. Of the light input from the second side, the desired separation signal is output to the first side, and the residual separation signal is output to the detection unit 22, whereby the residual separation signal is detected. In this configuration, the detection wavelength is adjusted by changing the detection port. Alternatively, instead of changing the port, it is also possible to adjust the refractive index by changing the temperature or voltage.

The configuration shown in FIG. 15 is substantially the same as the configuration in which the number of output ports to the detection unit 22 of the AWG 215 is two in the separation unit 21 described in FIG. 14. The configuration of FIG. 14 assumes an AWG that separates and outputs different wavelengths at FSR intervals. Although five waves are illustrated in FIG. 14, ports are provided as many as the number of wavelengths to be detected as a residual separation signal in addition to the desired separation signal. If there are 32 wavelength bands to be detected, one port is required for the desired separation signal and 31 ports are required for the residual separation signal. Therefore, there is a problem that the number of connection lines to the detection unit 22 is large. In order to solve this problem, for example, a configuration may be considered in which ports for the residual separation signal are multiplexed in a multiplexer and then passed to the detector 22. In such a configuration, the detection sensitivity of the detection section 22 may deteriorate due to loss in the multiplexing section. For example, if the number of ports is 2^N (2 to the N power), a branch loss of 3N dB will occur. As described above, if there are 32 ports, N=5, so the loss is 15 dB (≈1/32). As the multiplexing unit, a multiplexing unit 216 whose characteristics generally match those of the AWG 215 is used.

Therefore, in the modified example of the AWG shown in FIG. 15, the ports that output the residual separation signals on the long wavelength side and the short wavelength side of the wavelength of the desired separation signal output the wavelengths for a plurality of FSRs at once. In the case of the AWG 215 in FIG. 14, at least either the upper two ports or the lower two ports of the AWG 215 are combined into one port. Either the upper side or the lower side has a longer wavelength than the wavelength of the desired separation signal, and the opposite side has a shorter wavelength. In FIG. 15, the AWG 215 corresponds to a duplexer. Further, FIG. 15 has a configuration in which the ports in FIG. 14 from which the residual separation signal is output are summarized.

In the specific example of the diffraction grating shown in FIG. 16, the desired separated signal is transmitted through the diffraction grating and output from the right end of the figure to the first side. Further, the residual separation signal passes through the diffraction grating and is input to the detection unit 22 from the right end of the figure. Such a diffraction grating may be applied in place of the AWG 215 shown in FIG. 14, for example. In the specific example of the diffraction grating shown in FIG. 15, the desired separated signal is reflected by the reflection section 217 arranged at the right end of the diffraction grating shown in the figure, and is directed from the left end of the diffraction grating to the first side via the circulator 211. Output. Further, the residual separation signal passes through the diffraction grating and is input to the detection unit 22 from the right end of the figure. Note that in these configurations, a plurality of outputs may be bundled and aggregated by wavelength. At this time, the wavelength range to be aggregated is equal to or larger than the wavelength range in which non-conforming light must be detected. In FIG. 14, a single-input multiple-output configuration is illustrated, but a multiple-input multiple-output configuration can be applied in the same manner as the configuration using the multiple-input multiple-output AWG 215.

The diffraction grating shown in FIG. 16 corresponds to a demultiplexer, and the diffraction grating outputs each wavelength at a different angle. The output port of the AWG 215 in FIG. 14 corresponds to the output angle. Adjust the emission angle according to the wavelength to be detected.

The separation unit 21 may be configured using a waveguide ring resonator. For example, a micro ring resonator (MRR) with a resonator length of several tens of micrometers and a free spectral range (FSR) of several tens of nanometers may be used. The shape of the ring resonator section is not a perfect circle, but a racetrack shape in which the coupling section is a parallel straight waveguide may be used. With this configuration, the coupling coefficient at the coupling portion can be easily designed.

Series coupling may be applied to the waveguide ring resonator. In a series connection, multiple rings are provided. In the following description, an example of a waveguide type ring resonator in which one ring is used in the specific example of FIG. 17 will be described. Note that a plurality of rings may be used in the example shown in FIG. 17. With this configuration, it is possible to obtain spectral characteristics in which the transmission band is flat, the transition from the transmission band to the stop band (Roll-Off) is steep, and the amount of rejection is sufficient. Become. However, the coupling coefficient between the bus line waveguide and the microring and the coupling coefficient between one microring and another microring satisfy a certain condition called the Butterworth condition. A double ring is a specific example of series coupling that increases the Q value, which is the degree of resonance, while widening the passband (the width of the selected wavelength).

FIG. 17 is a diagram showing a configuration example in which the separation section 21 is configured using a waveguide type ring resonator. The separation section 21 includes a waveguide type ring resonator 218. The waveguide ring resonator 218 inputs the optical signal received from the second side from the upper left port, and outputs the desired separation signal and the residual separation signal from different ports.

The separation section 21 may be configured using a lattice type optical filter. The lattice optical filter is composed of, for example, a delay line, a symmetrical Mach-Zehnder interferometer type variable coupling ratio coupler, and a phase adjustment section. By changing the phase shift value of the optical filter, arbitrary filter characteristics can be obtained whose upper limit is the performance determined by the asymmetric Mach-Zehnder interference coefficient. The property that characteristics appear periodically for each FSR (Free Spectral Range) determined by ΔL is utilized. In the lattice type, the path length difference between the asymmetric MZIs forming the lattice is ΔL. In the transversal type, the length of the delay applying section between each branch is ΔL. In an AWG, the difference in length between one waveguide and an adjacent waveguide constituting an arrayed waveguide is ΔL.

If the period is short, it may be realized by combining multiple filters, similar to the periodic AWG. In order to eliminate polarization dependence, a reflective configuration may be realized by installing a circulator and a Faraday rotary mirror with a rotation angle of 90 degrees at the input and output ends, respectively. In FIG. 17, the combination of the ring waveguide and two straight waveguides of the waveguide ring resonator 218 corresponds to a duplexer. The wavelength to be detected is adjusted by changing the ring diameter R and the coupling between the ring waveguide and the straight waveguide.

FIG. 18 is a diagram showing a configuration example in which the separation section 21 is configured using a lattice type optical filter. The separation section 21 includes a lattice type optical filter 219. The lattice optical filter 219 inputs the optical signal received from the second side, and outputs the desired separation signal and the residual separation signal from different ports. Specifically, the lattice optical filter 219 outputs the desired separation signal from the first port to the first side, and outputs the residual separation signal from the second port to the detection unit 22. The delay ΔL of the delay arm of the lattice filter, the coupling ratio of the variable coupling ratio coupler, and the phase θ of the phase shifter are set so that the first port outputs the compatible wavelength component and the second port outputs the non-compatible wavelength component. be adjusted. Further, in the case of a lattice, the delay ΔL of the delay applying section, the coupling ratio of the tap (variable coupling ratio coupler), and the phase of the phase shifter may be adjusted. In FIG. 18, a lattice optical filter 219 in which Maha-Zenda interferometers are connected in cascade corresponds to a demultiplexer. The wavelength to be detected is changed by adjusting the coupling ratio of the phase shifter and coupler.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and includes designs within the scope of the gist of the present invention.

The present invention is applicable to a communication system that performs communication through an optical fiber transmission line.

30-1, 30-2, 30-2, 30-4, 30-5, 30-6, 30-7, 30-8...Ph-GW, 400, 1400, 2400, 3400, 5400, 6400, 7400... Shutdown control unit, 410, 1410, 2410, 3410, 5410, 6410, 7410...SA

Claims (7)

1. an acquisition unit that acquires the wavelength set in the user terminal;
   an optical distribution unit that outputs the optical signal to at least one of the plurality of output destinations;
   an observation unit that observes the wavelength of a signal input from a user terminal to the optical distribution unit or the wavelength of a signal output from the optical distribution unit to the user terminal;
   If the wavelength observed by the observation unit is different from the wavelength acquired by the acquisition unit, input from the user terminal or output to the user terminal is blocked, or a wavelength component different from the acquired wavelength is blocked. A cutoff section that
   communication system with.
2. comprising a splitter that branches a signal input from a user terminal to the optical distribution unit or a signal output from the optical distribution unit to the user terminal to an observation unit,
   The communication system according to claim 1, wherein the signal branched from the branching device is input to the observation unit in a time-division manner for each user terminal.
3. comprising another light distribution unit that outputs a signal input from the user terminal to the light distribution unit or a signal output from the light distribution unit to the user terminal to the observation unit,
   The communication system according to claim 1, wherein the signal output from the other optical distribution section is input to the observation section in a time-division manner for each user terminal.
4. The communication system according to claim 1, wherein the observation unit includes a duplexer that demultiplexes the input signal, and a detection unit that detects the signal output by the duplexer.
5. From claim 1, wherein the blocking unit causes the light distribution unit to block a signal determined to have a different wavelength when the wavelength observed by the observation unit is different from the wavelength acquired by the acquisition unit. The communication system according to claim 3.
6. From claim 1, wherein when the wavelength observed by the observation unit is different from the wavelength acquired by the acquisition unit, the blocking unit causes a wavelength filter to block the wavelength component of the wavelength determined to be different. The communication system according to claim 3.
7. A method for controlling a communication system including an optical distribution unit that outputs an optical signal to at least one of a plurality of output destinations, the method comprising:
   an acquisition step of acquiring a wavelength set in the user terminal;
   an observation step of observing the wavelength of a signal output from the user terminal to the optical distribution section or the wavelength of the signal output from the optical distribution section to the user terminal;
   If the wavelength observed in the observation step is different from the wavelength acquired in the acquisition step, input from the user terminal or output to the user terminal is blocked, or a wavelength component different from the acquired wavelength is blocked. a blocking step to
   A control method with

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