WO2022201696A1 - 光通信装置、光通信方法及び光通信システム - Google Patents
光通信装置、光通信方法及び光通信システム Download PDFInfo
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- WO2022201696A1 WO2022201696A1 PCT/JP2021/047707 JP2021047707W WO2022201696A1 WO 2022201696 A1 WO2022201696 A1 WO 2022201696A1 JP 2021047707 W JP2021047707 W JP 2021047707W WO 2022201696 A1 WO2022201696 A1 WO 2022201696A1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 503
- 238000004891 communication Methods 0.000 title claims abstract description 315
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 158
- 238000012544 monitoring process Methods 0.000 claims description 40
- 238000012549 training Methods 0.000 claims description 26
- 238000010586 diagram Methods 0.000 description 28
- 238000012545 processing Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/572—Wavelength control
Definitions
- the present invention relates to an optical communication device, an optical communication method, and an optical communication system.
- Patent Document 1 describes an optical transmission system that measures the BER (Bit Error Rate) of a received signal at a transponder section on the receiving side and feeds it back to the transmitting side.
- BER Bit Error Rate
- Patent Document 2 describes a transmission device that calculates an index value for narrowing of an optical signal by calculating an error in sampling timing when extracting a clock signal from an optical signal.
- Patent Document 3 describes a transmission device that monitors the phase shift of an optical signal and suppresses wavelengths adjacent to the outer edge of the transmission band from approaching the outer edge.
- WSS Wavelength Selective Switch
- An object of the present disclosure is to provide an optical communication device, an optical communication method, and an optical communication system capable of improving transmission characteristics in view of the above-described problems.
- An optical communication device is connected to an optical communication network having a plurality of optical communication devices connected by a transmission line that transmits WDM signal light in which a plurality of optical signals are wavelength division multiplexed, and another optical
- a monitor unit monitors the received waveform of the optical signal; and the optical signal transmitted by the other optical communication device based on the monitored received waveform.
- a center wavelength control section that feedback-controls the center wavelength of the transmission waveform of the signal.
- An optical communication method is an optical communication device connected to an optical communication network having a plurality of optical communication devices connected by a transmission line for transmitting WDM signal light in which a plurality of optical signals are wavelength division multiplexed. monitoring a received waveform of the optical signal when converting the optical signal received from another optical communication device into a digital signal; and feedback-controlling the center wavelength of the transmission waveform of the optical signal.
- An optical communication system comprises an optical communication network having a plurality of optical communication devices connected by a transmission line for transmitting WDM signal light in which a plurality of optical signals are wavelength division multiplexed, and the optical communication device is a monitor unit for monitoring the received waveform of the optical signal when converting the optical signal received from another optical communication device into a digital signal; and based on the monitored received waveform, the other optical communication device and a center wavelength control unit that feedback-controls the center wavelength of the transmission waveform of the optical signal transmitted by the.
- An optical communication system comprises an optical communication network having a plurality of optical communication devices connected by a transmission line for transmitting WDM signal light in which a plurality of optical signals are wavelength division multiplexed, and the optical communication network.
- a network management device that manages, when a second optical communication device that receives the optical signal transmitted by the first optical communication device converts the optical signal into a digital signal, the network management device a monitor unit for monitoring the received waveform of the optical signal; and a central wavelength control unit for feedback-controlling the central wavelength of the transmitted waveform of the optical signal transmitted by the first optical communication device based on the monitored received waveform.
- an optical communication device an optical communication method, and an optical communication system capable of improving transmission characteristics are provided.
- FIG. 1 is a configuration diagram illustrating an optical communication system according to an embodiment
- FIG. 1 is a block diagram illustrating an optical communication device according to an embodiment
- FIG. FIG. 4 is a diagram illustrating received waveforms of optical signals received by the receiving-side optical communication device according to the embodiment, where the horizontal axis indicates frequency and the vertical axis indicates optical intensity.
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by a transmission-side optical communication device according to an embodiment
- 1 is a flow chart diagram illustrating an optical communication method according to an embodiment
- FIG. FIG. 4 is a configuration diagram illustrating another optical communication system according to an embodiment
- FIG. 4 is a block diagram illustrating a network management device in another optical communication system according to an embodiment
- 1 is a block diagram illustrating the configuration of an optical communication device according to Embodiment 1
- FIG. FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform before adjustment by the center wavelength control unit
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform being adjusted by the center wavelength control unit
- FIG. 3 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform after adjustment by the center wavelength control unit;
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform before adjustment by the center wavelength control unit;
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform being adjusted by the center wavelength control unit;
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform being adjusted by the center wavelength control unit;
- FIG. 3 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform after adjustment by the center wavelength control unit;
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform before adjustment by the center wavelength control unit;
- FIG. 4 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform being adjusted by the center wavelength control unit;
- FIG. 3 is a diagram illustrating a transmission waveform and a narrowed bandwidth of an optical signal transmitted by the optical communication device on the transmission side according to the first embodiment, and shows the transmission waveform after adjustment by the center wavelength control unit;
- FIG. 1 is a configuration diagram illustrating an optical communication system according to an embodiment.
- the optical communication system 1 includes an optical communication network 100 .
- the optical communication network 100 has a plurality of optical communication devices NE1 and NE2. Although two optical communication devices NE1 and NE2 are shown in the figure, the number of optical communication devices NE1 and NE2 is not limited.
- Each optical communication device NE1 and NE2 is connected to an optical communication network via a transmission line. Therefore, the optical communication network 100 is configured by connecting a plurality of optical communication devices NE1 and NE2 via transmission lines.
- Each optical communication device NE may be connected in a point-to-point manner, may be connected in a ring manner, or may be connected in a mesh manner.
- the optical communication devices NE1 and NE2 are collectively called an optical communication device NE.
- the transmission line transmits WDM signal light obtained by wavelength division multiplexing a plurality of optical signals.
- the WDM signal light is transmitted from the optical communication device NE1 on the transmission side to the optical communication device NE2 on the reception side.
- the optical communication device NE2 is the transmitting side and the optical communication device NE1 is the receiving side.
- the optical communication device NE is a node of the optical communication network 100 .
- the optical communication device NE may be connected to a transmitter and a receiver (not shown) via communication lines.
- the optical communication device NE may function as a multiplexer, a repeater, and a demultiplexer under the control of ROADM (Reconfigurable Optical Add and Drop Multiplexing).
- Optical communication network 100 transmits optical signals using wavelength division multiplexing (WDM).
- WDM wavelength division multiplexing
- the optical communication device NE2 on the receiving side receives the WDM signal light transmitted by the optical communication device NE1 on the transmitting side.
- the optical communication device NE2 branches a predetermined optical signal from the received WDM signal light.
- the optical communication device NE2 on the receiving side converts the branched optical signal into a digital signal.
- each optical communication device NE has a digital signal processor DSP.
- a digital signal processor DSP arranged in the optical communication device NE2 on the receiving side converts the received optical signal into a digital signal.
- FIG. 2 is a block diagram illustrating the optical communication device NE according to the embodiment.
- the optical communication device NE has a digital signal processor DSP, a monitor MN and a central wavelength controller CW.
- the digital signal processor DSP, monitor MN, and center wavelength controller CW function as digital signal processor, monitor, and center wavelength controller, respectively.
- the digital signal processing unit DSP converts the received optical signal into a digital signal.
- the monitor unit MN monitors the received waveform of the optical signal when converting the optical signal received from another optical communication device NE into a digital signal.
- the center wavelength control unit CW feedback-controls the center wavelength of the transmission waveform of the optical signal transmitted by the other optical communication device NE, based on the monitored received waveform.
- FIG. 3 is a diagram illustrating received waveforms of optical signals received by the receiving-side optical communication device NE2 according to the embodiment, where the horizontal axis indicates frequency and the vertical axis indicates optical intensity.
- the monitor unit MN monitors the received waveform of the optical signal, which indicates the relationship of the optical intensity to the wavelength or frequency.
- the monitor unit MN may monitor the center wavelength or the center frequency of the received waveform. Alternatively, the monitor unit MN may monitor the shape including the bandwidth of the received waveform.
- FIG. 4 is a diagram exemplifying the transmission waveform and the narrowed bandwidth of the optical signal transmitted by the transmission-side optical communication device NE1 according to the embodiment.
- the optical signal transmitted from the optical communication device NE1 on the transmission side has a transmission waveform 20.
- the high wavelength side or the high frequency side is defined as +X-axis direction.
- the end of the transmission waveform 20 on the ⁇ X-axis direction is called an end 21
- the end of the transmission waveform 20 on the +X-axis direction is called an end 22 .
- a center wavelength of the transmission waveform 20 is called a center wavelength 23 . If the X-axis indicates frequency, the center wavelength 23 may be replaced with the center frequency. In the following, similarly, the center wavelength may be replaced with the center frequency.
- Transmit waveform 20 has a bandwidth 25 .
- the optical signal transmitted from the transmission-side optical communication device NE1 is inserted into the WDM signal light and transmitted through the optical communication network 100. Then, in the optical communication device NE2, it is narrowed by a filter of a wavelength selective switch that selects an optical signal to be added to the WDM signal light or an optical signal to be branched from the WDM signal light.
- the end portion of the band 40 narrowed by the filter on the ⁇ X-axis direction side is called an end portion 41
- the end portion on the +X-axis direction side is called an end portion 42 .
- the bandwidth is called bandwidth 45 .
- the monitor unit MN of the optical communication device NE2 monitors the bandwidth 45 narrowed by the filters of the wavelength selective switches in the plurality of optical communication devices NE. As a result, the monitor unit MN monitors the optical signal in the narrowed bandwidth 45 as the received waveform 30 . Based on the monitored reception waveform 30, the center wavelength control unit CW feedback-controls the center wavelength 23 in the transmission waveform 20 of the optical signal transmitted by the other optical communication device NE1.
- the center wavelength controller CW controls the center wavelength 23 of the transmission waveform 20 by controlling the wavelength tunable laser of the optical communication device NE1.
- the monitor unit MN monitors the position of the end 41 of the filter where the transmission waveform 20 is cut.
- the center wavelength control unit CW further moves the center wavelength 23 of the transmission waveform 20 toward the +X-axis direction.
- the monitor unit MN monitors the position of the end 42 of the filter where the transmission waveform 20 is cut.
- the monitor unit MN acquires the shape of the filter from the positions of the ends 41 and 42 of the filter and aligns the center wavelength 23 of the transmission waveform 20 with the center of the narrowed bandwidth 45. can be done.
- the center wavelength control CW may feedback-control the center wavelength 23 of the transmission waveform 20 based on the shape including the bandwidth of the reception waveform 30 .
- FIG. 5 is a flow chart diagram illustrating an optical communication method according to the embodiment. As shown in step S11 of FIG. 5, the received waveform 30 is monitored. Specifically, the monitor unit MN of the optical communication device NE2 monitors the received waveform 30 of the optical signal when converting the optical signal received from the other optical communication device NE1 into a digital signal.
- the center wavelength 23 in the transmission waveform 20 is feedback-controlled based on the reception waveform 30. Specifically, based on the monitored received waveform 30, the center wavelength controller CW of the optical communication device NE2 feedback-controls the center wavelength 23 in the transmission waveform 20 of the optical signal transmitted by the other optical communication device NE1.
- the center wavelength control unit CW feedback-controls the center wavelength 23 in the transmission waveform 20 based on the received waveform 30 monitored by the monitor unit MN. Therefore, each optical signal in the WDM signal light has an appropriate central wavelength, so transmission characteristics can be improved.
- FIG. 6 is a configuration diagram illustrating another optical communication system according to the embodiment.
- the optical communication system 1a may comprise a network manager NMS and an optical communication network 100.
- FIG. The figure shows four optical communication devices NE1 to NE4. Each optical communication device NE is connected to a network management device NMS via a communication line such as a LAN.
- FIG. 7 is a block diagram illustrating the network management device NMS in another optical communication system according to the embodiment.
- the network management device NMS includes a monitor section 11 and a central wavelength control section 12.
- FIG. The monitor section 11 and the center wavelength control section 12 have functions as monitor means and center wavelength control means.
- each optical communication device NE may or may not have the monitor unit MN and the central wavelength control unit CW.
- the monitor unit 11 monitors the received waveform 30 of the optical signal received by each optical communication device NE.
- the optical communication device NE2 receives optical signals transmitted by the optical communication device NE1.
- the monitor unit 11 monitors the received waveform 30 of the optical signal received by the optical communication device NE2 when the optical communication device NE2 converts the optical signal into a digital signal.
- the monitor unit 11 may monitor the bandwidth 45 narrowed by a filter that selects the wavelength of the optical signal in a plurality of optical communication devices NE.
- the monitor unit 11 may monitor a received waveform 30 that indicates the relationship of optical intensity to wavelength or frequency in the optical signal.
- the center wavelength control unit 12 feedback-controls the center wavelength 23 in the transmission waveform 20 of the optical signal transmitted by the optical communication device NE1 based on the monitored reception waveform 30 .
- the optical communication method shown in FIG. 5 may be performed using the network management device NMS.
- the monitor unit 11 of the network management device NMS monitors the reception waveform 30 of the received optical signal when converting the optical signal received by the optical communication device NE2 into a digital signal. You may
- the central wavelength control unit 12 of the network management device NMS transmits the optical signal in the optical communication device NE1, which transmitted the optical signal, based on the received waveform 30 monitored in the optical communication device NE2.
- the central wavelength 23 in the transmission waveform 20 of the optical signal may be feedback controlled.
- the center wavelength control section 12 feedback-controls the center wavelength 23 in the transmission waveform 20 based on the received waveform 30 monitored by the monitor section 11 . Therefore, each optical signal in the WDM signal light has an appropriate central wavelength, so transmission characteristics can be improved.
- FIG. 8 is a block diagram illustrating the configuration of the optical communication device NE according to the first embodiment.
- the optical communication device NE includes a digital signal processing unit DSP, a monitor unit MN, a central wavelength control unit CW, a wavelength cross-connect function unit 110, a wavelength cross-connect function unit 120, and a wavelength multiplexing/demultiplexing unit. It has a functional section 130 , a transponder functional section 140 and an NE control section 150 .
- the wavelength cross-connect function unit 110 and the wavelength cross-connect function unit 120 function as wavelength cross-connect means.
- the wavelength multiplexing/demultiplexing function unit 130 and the transponder function unit 140 function as wavelength multiplexing/demultiplexing means and transponder means.
- the NE control unit 150 functions as control means for the optical communication device NE.
- An amplifier may be connected to the wavelength cross-connect function unit 110 and the wavelength cross-connect function unit 120 .
- a transmitter and a receiver may be connected to the wavelength multiplexing/demultiplexing function unit 130 via the transponder function unit 140 .
- a multiplexer can be configured by the wavelength cross-connect function unit 120 and the wavelength multiplexing/demultiplexing function unit 130 .
- a demultiplexing device can be configured by the wavelength cross-connect function unit 110 and the wavelength multiplexing/demultiplexing function unit 130 .
- the wavelength cross-connect function unit 110 and the wavelength cross-connect function unit 120 may constitute a repeater. Note that the repeater may not have the wavelength cross-connect function unit 110 and the wavelength cross-connect function unit 120 and may be configured by an amplifier.
- the wavelength cross-connect function unit 110 wavelength-demultiplexes a predetermined optical signal from the received WDM signal light. Specifically, the wavelength cross-connect function unit 110 selects and switches the wavelength band for branching the optical signal.
- the wavelength cross-connect function unit 110 includes a WSS control unit 111 and a wavelength selective switch (Wavelength Selective Switch) 112 .
- the WSS control unit 111 functions as control means for controlling the operation of the wavelength selective switch 112 .
- the wavelength selective switch 112 has a function as switching means for selecting a predetermined wavelength.
- the wavelength cross-connect function unit 120 wavelength-multiplexes a predetermined optical signal onto the WDM signal light. Specifically, the wavelength cross-connect function unit 120 selects and switches the wavelength band into which the optical signal is inserted.
- the wavelength cross-connect function section 120 includes a WSS control section 121 and a wavelength selective switch 122 .
- the WSS control unit 121 functions as control means for controlling the operation of the wavelength selective switch 122 .
- the wavelength selective switch 122 has a function as switching means for selecting a predetermined wavelength.
- the wavelength multiplexing/demultiplexing function unit 130 and the transponder function unit 140 transmit the optical signal separated from the wavelength cross-connect function unit 110 to the receiver. Specifically, the wavelength multiplexing/demultiplexing function unit 130 and the transponder function unit 140 receive the branched optical signal from the wavelength band. Also, the wavelength multiplexing/demultiplexing function unit 130 and the transponder function unit 140 multiplex the optical signals transmitted from the transmitter and transmit them to the wavelength cross-connection function unit 120 . Specifically, the wavelength multiplexing/demultiplexing function unit 130 and the transponder function unit 140 transmit the optical signal to be inserted into the wavelength band.
- the NE control unit 150 controls the operations of the wavelength cross-connect function unit 110 , the wavelength cross-connect function unit 120 , the wavelength multiplexing/demultiplexing function unit 130 and the transponder function unit 140 .
- an optical communication method will be described as an operation of the optical communication device NE. If the bandwidth 25 of the transmission waveform 20 is greater than the narrowed bandwidth 45 (bandwidth of the transmission waveform > narrowed bandwidth), then the bandwidth 25 of the transmission waveform 20 is less than the narrowed bandwidth. narrowed bandwidth 45 (transmit waveform bandwidth ⁇ narrowed bandwidth), and if the bandwidth 25 of the transmitted waveform 20 is significantly smaller than the narrowed bandwidth 45. (Bandwidth of transmission waveform ⁇ narrowed bandwidth) will be described separately.
- FIG. 10 shows the transmission waveform 20 before adjustment by the center wavelength control section CW
- FIG. 10 shows the transmission waveform 20 during adjustment by the center wavelength control section CW
- FIG. 11 shows the transmission waveform 20 after adjustment by the center wavelength control section CW.
- the bandwidth 25 of the transmitted waveform 20 is greater than the narrowed bandwidth 45. Edges 21 and 22 of transmit waveform 20 lie outside narrowed bandwidth 45 . Therefore, the monitor unit MN monitors the received waveform 30 over the narrowed bandwidth 45 . Also, the monitor unit MN can monitor the positions of the ends 41 and 42 of the bandwidth 45 narrowed by the filter. Thereby, the monitor unit MN can monitor the center position of the bandwidth 45 .
- the central wavelength control section CW feedback-controls the transmission waveform 20 based on the reception waveform 30 .
- the center wavelength controller CW dynamically controls the transmission waveform 20 to move the transmission waveform 20 in the +X-axis direction. Edge 21 of transmit waveform 20 then moves within the narrowed bandwidth 45 .
- the monitor unit MN can monitor the end portion 21 of the transmission waveform 20 .
- the central wavelength control unit CW dynamically controls the transmission waveform 20 to move the transmission waveform 20 in the -X-axis direction. Edge 22 of transmit waveform 20 then moves within the narrowed bandwidth 45 .
- the monitor unit MN can monitor the central wavelength 23 as well as the bandwidth 25 of the transmission waveform 20 . Therefore, as shown in FIG. 11, the center wavelength control section CW can place the center wavelength 23 of the transmission waveform 20 at the center of the narrowed bandwidth 45 .
- [bandwidth of transmission waveform ⁇ narrowed bandwidth] 12 to 14 are diagrams exemplifying the transmission waveform 20 and the narrowed bandwidth 45 of the optical signal transmitted by the transmission-side optical communication device NE according to the first embodiment, and FIG. 13 shows the transmission waveform 20 before adjustment by the center wavelength control unit CW, FIG. 14 shows the transmission waveform 20 after adjustment by the center wavelength control unit CW.
- the bandwidth 25 of the transmission waveform 20 is smaller than the narrowed bandwidth 45.
- Edge 21 of transmit waveform 20 lies outside narrowed bandwidth 45 .
- the edge 22 of the transmit waveform 20 lies within the narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the end portion 22 of the transmission waveform 20 . Also, the monitor unit MN monitors the received waveform 30 on the -X-axis direction side of the narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the position of the edge 41 of the bandwidth 45 narrowed by the filter.
- the center wavelength control section CW feedback-controls the transmission waveform 20 based on the reception waveform 30 .
- the center wavelength controller CW dynamically controls the transmission waveform 20 to move the transmission waveform 20 in the +X-axis direction. Edge 21 of transmit waveform 20 then moves within the narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the end portion 21 of the transmission waveform 20 . Thereby, the monitor unit MN can monitor the bandwidth 25 of the transmission waveform 20 and the center wavelength 23 of the transmission waveform 20 . Also, the monitor unit MN monitors the received waveform 30 on the +X-axis direction side of the narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the position of the edge 42 of the bandwidth 45 narrowed by the filter. Thereby, the monitor unit MN can monitor the center position of the bandwidth 45 .
- the central wavelength control section CW can place the central wavelength 23 of the transmission waveform 20 at the center of the narrowed bandwidth 45 .
- [bandwidth of transmitted waveform ⁇ narrowed bandwidth] 15 to 17 are diagrams exemplifying the transmission waveform 20 and the narrowed bandwidth 45 of the optical signal transmitted by the transmission-side optical communication device NE according to the first embodiment, and FIG. 16 shows the transmission waveform 20 before adjustment by the center wavelength control unit CW, FIG. 17 shows the transmission waveform 20 after adjustment by the center wavelength control unit CW.
- the bandwidth 25 of the transmission waveform 20 is overwhelmingly smaller than the narrowed bandwidth 45. Edges 21 and 22 of transmit waveform 20 are located within narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the ends 21 and 22 of the transmission waveform 20 . Thereby, the monitor unit MN can monitor the bandwidth 25 of the transmission waveform 20 and the center wavelength 23 of the transmission waveform 20 . Also, the monitor unit MN can monitor the received waveform 30 .
- the central wavelength control section CW feedback-controls the transmission waveform 20 based on the reception waveform 30 .
- the center wavelength control unit CW dynamically controls the transmission waveform 20 to move the transmission waveform 20 toward the ⁇ X-axis direction from the end portion 41 .
- the transmit waveform 20 then moves outside the narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the position of the edge 41 of the bandwidth 45 narrowed by the filter.
- the center wavelength control unit CW dynamically controls the transmission waveform 20 to move the transmission waveform 20 to the +X-axis direction side from the end portion 42 .
- the transmit waveform 20 then moves outside the narrowed bandwidth 45 . Therefore, the monitor unit MN can monitor the position of the edge 42 of the bandwidth 45 narrowed by the filter. Thereby, the monitor unit MN can monitor the center position of the bandwidth 45 .
- the center wavelength control unit CW can place the center wavelength 23 of the transmission waveform 20 at the center of the narrowed bandwidth 45.
- the monitor unit MN may monitor the received waveform of the main optical signal transmitted and received during operation of the optical communication network 100, and monitor the received waveform of the training optical signal transmitted and received during adjustment of the optical communication network 100. good too.
- a transmission waveform 20 such that the bandwidth 25 of the transmission waveform 20>the narrowed bandwidth 45 may be used for the main optical signal.
- the transmission waveform 20 that satisfies the following conditions: the bandwidth 25 of the transmission waveform 20 ⁇ the narrowed bandwidth 45, and the bandwidth 25 of the transmission waveform 20 ⁇ the narrowed bandwidth 45. may be used.
- the bandwidth 25 of the training optical signal By making the bandwidth 25 of the training optical signal smaller than the narrowed bandwidth 45, the influence between adjacent optical signals can be reduced.
- the wavelength width over which the central wavelength control unit CW dynamically controls the transmission waveform 20 is small, the ends 41 and 42 of the narrowed bandwidth 45 can be easily found. Therefore, adjustment can be facilitated.
- the transmission waveform 20 is used for the main optical signal such that the bandwidth 25 of the transmission waveform 20 ⁇ the narrowed bandwidth 45 and the bandwidth 25 of the transmission waveform 20 ⁇ the narrowed bandwidth 45. may Thereby, the transmission capacity can be increased.
- Embodiment 2 Next, an optical communication system according to Embodiment 2 will be described.
- the reception waveform 30 is monitored and the adjustment timing for feedback control of the transmission waveform 20 is changed.
- the transmission waveform 20 may be adjusted. Specifically, when a new optical communication device NE is connected, transmission and reception of the training optical signal may be performed. Then, the new optical communication device NE may monitor the received waveform 30 and feedback-control the center wavelength 23 of the transmission waveform 20 on the transmitting side based on the received waveform 30 . As a result, the transmission characteristics of the newly launched optical communication device NE can be improved.
- the transmission waveform 20 may be adjusted in order to correct changes in the optical communication network 100 over time. Specifically, when the optical communication network 100 is inspected at predetermined intervals, the training optical signal may be transmitted and received. Then, each optical communication device NE may monitor the received waveform 30 and feedback-control the center wavelength 23 of the transmission waveform 20 on the transmission side. As a result, the influence of aging of the optical communication network 100 can be reduced.
- the transmission waveform 20 may be adjusted. Specifically, when changing the route from the optical communication device NE1 to the optical communication device NE2, the transmission and reception of the optical training signal may be performed. Then, the optical communication device NE2 may monitor the received waveform 30 and feedback-control the center wavelength 23 of the transmission waveform 20 on the transmission side. This makes it possible to improve the transmission characteristics of the changed route.
- Appendix 1 In an optical communication device connected to an optical communication network having a plurality of optical communication devices connected by a transmission line for transmitting WDM signal light in which a plurality of optical signals are wavelength division multiplexed, said light received from another optical communication device monitoring a received waveform of the optical signal as the signal is converted to a digital signal; feedback-controlling a center wavelength of a transmission waveform of the optical signal transmitted by the other optical communication device, based on the monitored received waveform;
- An optical communication method comprising: (Appendix 2) In the monitoring step, In the plurality of optical communication devices, monitoring a bandwidth narrowed by a filter that selects a wavelength of the optical signal to be added to the WDM signal light or the optical signal to be dropped from the WDM signal light; The optical communication method according to appendix 1.
- An optical communication network having a plurality of optical communication devices connected by a transmission line for transmitting WDM signal light in which a plurality of optical signals are wavelength division multiplexed,
- the optical communication device is a monitor unit for monitoring a received waveform of the optical signal when converting the optical signal received from another optical communication device into a digital signal; a center wavelength control unit that feedback-controls a center wavelength of a transmission waveform of the optical signal transmitted by the other optical communication device based on the monitored received waveform; having Optical communication system.
- the monitoring unit monitors, in the plurality of optical communication devices, a bandwidth narrowed by a filter that selects a wavelength of the optical signal to be added to the WDM signal light or the optical signal to be dropped from the WDM signal light.
- the optical communication system according to appendix 8. (Appendix 10) The monitor unit monitors the bandwidth of the transmission waveform. 10.
- the optical communication system according to appendix 8 or 9. (Appendix 11) wherein the monitor unit monitors a received waveform indicating a relationship of light intensity with respect to wavelength or frequency in the optical signal; The optical communication system according to any one of Appendices 8 to 10.
- the monitor unit monitors the received waveform of the main optical signal transmitted and received during operation of the optical communication network and the received waveform of the training optical signal transmitted and received during adjustment of the optical communication network.
- the optical communication system according to any one of Appendices 8 to 11. (Appendix 13) making the bandwidth of the training optical signal smaller than the bandwidth narrowed by a filter that selects the wavelength of the optical signal to be added to the WDM signal light or the optical signal to be branched from the WDM signal light; 13.
- Appendix 14 at least one of the following cases: when a new optical communication device is connected to the optical communication network; when the optical communication network is inspected at predetermined intervals; and when a route in the optical communication network is changed. , transmitting and receiving the training optical signal; 14.
- an optical communication network having a plurality of optical communication devices connected by transmission lines for transmitting WDM signal light in which a plurality of optical signals are wavelength division multiplexed; a network management device that manages the optical communication network; with The network management device a monitor unit for monitoring the received waveform of the optical signal when the second optical communication device that has received the optical signal transmitted by the first optical communication device converts the optical signal into a digital signal; a center wavelength control unit that feedback-controls a center wavelength of a transmission waveform of the optical signal transmitted by the first optical communication device based on the monitored received waveform; having Optical communication system.
- the monitoring unit monitors, in the plurality of optical communication devices, a bandwidth narrowed by a filter that selects a wavelength of the optical signal to be added to the WDM signal light or the optical signal to be dropped from the WDM signal light. , 16.
- the optical communication system according to appendix 15. The monitor unit monitors the bandwidth of the transmission waveform. 17.
- (Appendix 18) wherein the monitor unit monitors a received waveform indicating a relationship of light intensity with respect to wavelength or frequency in the optical signal; 18.
- the optical communication system according to any one of Appendices 15-17.
- the monitor unit monitors the received waveform of the main optical signal transmitted and received during operation of the optical communication network and the received waveform of the training optical signal transmitted and received during adjustment of the optical communication network. 19.
- the optical communication system according to any one of Appendices 15-18. (Appendix 20) making the bandwidth of the training optical signal smaller than the bandwidth narrowed by a filter that selects the wavelength of the optical signal to be added to the WDM signal light or the optical signal to be branched from the WDM signal light; 19.
- Appendix 21 at least one of the following cases: when a new optical communication device is connected to the optical communication network; when the optical communication network is inspected at predetermined intervals; and when a route in the optical communication network is changed. , transmitting and receiving the training optical signal; 21.
- Optical communication system 11 Monitor unit 12 Center wavelength control unit 20 Transmission waveforms 21, 22 Edge 23 Center wavelength 25 Bandwidth 30 Receive waveform 40 Narrowed band 41 Edge 42 Edge 45 Bandwidth 100
- Optical communication network CW center wavelength control part DSP digital signal processing part MN monitor part NE, NE1, NE2, NE3, NE4 optical communication device NMS network management device
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Abstract
Description
本開示の実施形態の説明に先立って、本開示にかかる実施形態の概要について説明する。まず、光通信システムを説明する。その後、光通信装置を説明し、光通信方法を説明する。また、別の光通信システム及びネットワーク管理装置を説明する。
実施形態に係る光通信システムを説明する。図1は、実施形態に係る光通信システムを例示した構成図である。図1に示すように、光通信システム1は、光通信ネットワーク100を備える。光通信ネットワーク100は、複数の光通信装置NE1及びNE2を有している。図では、2つの光通信装置NE1及びNE2が示されているが、光通信装置NE1及びNE2の個数は限定されない。各光通信装置NE1及びNE2は、伝送路を介して、光通信ネットワークに接続している。よって、光通信ネットワーク100は、複数の光通信装置NE1及びNE2が伝送路で接続されることにより構成されている。各光通信装置NEは、ポイントtoポイント状に接続されてもよいし、リング状に接続されてもよいし、メッシュ状に接続されてもよい。なお、光通信装置NE1及びNE2を総称して光通信装置NEと呼ぶ。
次に、光通信装置を説明する。図2は、実施形態に係る光通信装置NEを例示したブロック図である。図2に示すように、光通信装置NEは、デジタル信号処理部DSP、モニタ部MN及び中心波長制御部CWを有している。デジタル信号処理部DSP、モニタ部MN及び中心波長制御部CWは、それぞれ、デジタル信号処理手段、モニタ手段及び中心波長制御手段としての機能を有している。
次に、光通信方法を説明する。図5は、実施形態に係る光通信方法を例示したフローチャート図である。図5のステップS11に示すように、受信波形30をモニタする。具体的には、光通信装置NE2のモニタ部MNは、他の光通信装置NE1から受信した光信号をデジタル信号に変換する際に、光信号の受信波形30をモニタする。
次に、別の光通信システムを説明する。図6は、実施形態に係る別の光通信システムを例示した構成図である。図6に示すように、光通信システム1aは、ネットワーク管理装置NMS及び光通信ネットワーク100を備えてもよい。図では、4つの光通信装置NE1~NE4が示されている。各光通信装置NEは、LAN等の通信回線によりネットワーク管理装置NMSに接続されている。
図7は、実施形態に係る別の光通信システムにおいて、ネットワーク管理装置NMSを例示したブロック図である。図7に示すように、ネットワーク管理装置NMSは、モニタ部11と、中心波長制御部12と、を備えている。モニタ部11及び中心波長制御部12は、モニタ手段及び中心波長制御手段としての機能を有する。光通信システム1aの場合には、各光通信装置NEは、モニタ部MN及び中心波長制御部CWを有してもよいし、有していなくてもよい。
次に、実施形態1に係る光通信システムの詳細を説明する。まず、光通信装置NEの構成を説明する。その後、光通信方法を説明する。
図8は、実施形態1に係る光通信装置NEの構成を例示したブロック図である。図8に示すように、光通信装置NEは、デジタル信号処理部DSP、モニタ部MN及び中心波長制御部CWの他に、波長クロスコネクト機能部110、波長クロスコネクト機能部120、波長合分波機能部130、トランスポンダ機能部140及びNE制御部150を有している。
次に、光通信装置NEの動作として、光通信方法を説明する。光通信方法を、送信波形20の帯域幅25が、狭窄化された帯域幅45よりも大きい場合(送信波形の帯域幅>狭窄化された帯域幅)、送信波形20の帯域幅25が、狭窄化された帯域幅45よりも小さい場合(送信波形の帯域幅<狭窄化された帯域幅)、及び、送信波形20の帯域幅25が、狭窄化された帯域幅45よりも圧倒的に小さい場合(送信波形の帯域幅<<狭窄化された帯域幅)に分けて説明する。
図9~図11は、実施形態1に係る送信側の光通信装置NEが送信した光信号の送信波形20及び狭窄化された帯域幅45を例示した図であり、図9は、中心波長制御部CWによる調整前の送信波形20を示し、図10は、中心波長制御部CWによる調整中の送信波形20を示し、図11は、中心波長制御部CWによる調整後の送信波形20を示す。
図12~図14は、実施形態1に係る送信側の光通信装置NEが送信した光信号の送信波形20及び狭窄化された帯域幅45を例示した図であり、図12は、中心波長制御部CWによる調整前の送信波形20を示し、図13は、中心波長制御部CWによる調整中の送信波形20を示し、図14は、中心波長制御部CWによる調整後の送信波形20を示す。
図15~図17は、実施形態1に係る送信側の光通信装置NEが送信した光信号の送信波形20及び狭窄化された帯域幅45を例示した図であり、図15は、中心波長制御部CWによる調整前の送信波形20を示し、図16は、中心波長制御部CWによる調整中の送信波形20を示し、図17は、中心波長制御部CWによる調整後の送信波形20を示す。
次に、実施形態2に係る光通信システムを説明する。本実施形態では、受信波形30をモニタし、送信波形20のフィードバック制御を行う調整時期を変更する。
複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークに接続した光通信装置において、他の光通信装置から受信した前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするステップと、
モニタした前記受信波形に基づいて、前記他の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御するステップと、
を備えた光通信方法。
(付記2)
前記モニタするステップにおいて、
前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
付記1に記載の光通信方法。
(付記3)
前記モニタするステップにおいて、
前記送信波形の帯域幅をモニタする、
付記1または2に記載の光通信方法。
(付記4)
モニタするステップにおいて、
前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
付記1~3のいずれか1項に記載の光通信方法。
(付記5)
前記モニタするステップにおいて、
前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
付記1~4のいずれか1項に記載の光通信方法。
(付記6)
前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
付記5に記載の光通信方法。
(付記7)
前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
付記5または6に記載の光通信方法。
(付記8)
複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークを備え、
前記光通信装置は、
他の光通信装置から受信した前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするモニタ部と、
モニタした前記受信波形に基づいて、前記他の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御する中心波長制御部と、
を有する、
光通信システム。
(付記9)
前記モニタ部は、前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
付記8に記載の光通信システム。
(付記10)
前記モニタ部は、前記送信波形の帯域幅をモニタする、
付記8または9に記載の光通信システム。
(付記11)
前記モニタ部は、前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
付記8~10のいずれか1項に記載の光通信システム。
(付記12)
前記モニタ部は、前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
付記8~11のいずれか1項に記載の光通信システム。
(付記13)
前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
付記12に記載の光通信システム。
(付記14)
前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
付記12または13に記載の光通信システム。
(付記15)
複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークと、
前記光通信ネットワークを管理するネットワーク管理装置と、
を備え、
前記ネットワーク管理装置は、
第1の光通信装置によって送信された前記光信号を受信した第2の光通信装置が前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするモニタ部と、
モニタした前記受信波形に基づいて、前記第1の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御する中心波長制御部と、
を有する、
光通信システム。
(付記16)
前記モニタ部は、前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
付記15に記載の光通信システム。
(付記17)
前記モニタ部は、前記送信波形の帯域幅をモニタする、
付記15または16に記載の光通信システム。
(付記18)
前記モニタ部は、前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
付記15~17のいずれか1項に記載の光通信システム。
(付記19)
前記モニタ部は、前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
付記15~18のいずれか1項に記載の光通信システム。
(付記20)
前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
付記19に記載の光通信システム。
(付記21)
前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
付記19または20に記載の光通信システム。
11 モニタ部
12 中心波長制御部
20 送信波形
21、22 端部
23 中心波長
25 帯域幅
30 受信波形
40 狭窄化された帯域
41 端部
42 端部
45 帯域幅
100 光通信ネットワーク
CW 中心波長制御部
DSP デジタル信号処理部
MN モニタ部
NE、NE1、NE2、NE3、NE4 光通信装置
NMS ネットワーク管理装置
Claims (28)
- 複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークに接続し、他の光通信装置から受信した前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするモニタ手段と、
モニタした前記受信波形に基づいて、前記他の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御する中心波長制御手段と、
を備えた光通信装置。 - 前記モニタ手段は、前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
請求項1に記載の光通信装置。 - 前記モニタ手段は、前記送信波形の帯域幅をモニタする、
請求項1または2に記載の光通信装置。 - 前記モニタ手段は、前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
請求項1~3のいずれか1項に記載の光通信装置。 - 前記モニタ手段は、前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
請求項1~4のいずれか1項に記載の光通信装置。 - 前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
請求項5に記載の光通信装置。 - 前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
請求項5または6に記載の光通信装置。 - 複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークに接続した光通信装置において、他の光通信装置から受信した前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするステップと、
モニタした前記受信波形に基づいて、前記他の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御するステップと、
を備えた光通信方法。 - 前記モニタするステップにおいて、
前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
請求項8に記載の光通信方法。 - 前記モニタするステップにおいて、
前記送信波形の帯域幅をモニタする、
請求項8または9に記載の光通信方法。 - モニタするステップにおいて、
前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
請求項8~10のいずれか1項に記載の光通信方法。 - 前記モニタするステップにおいて、
前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
請求項8~11のいずれか1項に記載の光通信方法。 - 前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
請求項12に記載の光通信方法。 - 前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
請求項12または13に記載の光通信方法。 - 複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークを備え、
前記光通信装置は、
他の光通信装置から受信した前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするモニタ手段と、
モニタした前記受信波形に基づいて、前記他の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御する中心波長制御手段と、
を有する、
光通信システム。 - 前記モニタ手段は、前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
請求項15に記載の光通信システム。 - 前記モニタ手段は、前記送信波形の帯域幅をモニタする、
請求項15または16に記載の光通信システム。 - 前記モニタ手段は、前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
請求項15~17のいずれか1項に記載の光通信システム。 - 前記モニタ手段は、前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
請求項15~18のいずれか1項に記載の光通信システム。 - 前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
請求項19に記載の光通信システム。 - 前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
請求項19または20に記載の光通信システム。 - 複数の光信号が波長分割多重されたWDM信号光を伝送する伝送路によって接続された複数の光通信装置を有する光通信ネットワークと、
前記光通信ネットワークを管理するネットワーク管理装置と、
を備え、
前記ネットワーク管理装置は、
第1の光通信装置によって送信された前記光信号を受信した第2の光通信装置が前記光信号をデジタル信号に変換する際に、前記光信号の受信波形をモニタするモニタ手段と、
モニタした前記受信波形に基づいて、前記第1の光通信装置が送信する前記光信号の送信波形における中心波長をフィードバック制御する中心波長制御手段と、
を有する、
光通信システム。 - 前記モニタ手段は、前記複数の光通信装置において、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅をモニタする、
請求項22に記載の光通信システム。 - 前記モニタ手段は、前記送信波形の帯域幅をモニタする、
請求項22または23に記載の光通信システム。 - 前記モニタ手段は、前記光信号において、波長または周波数に対する光強度の関係を示す受信波形をモニタする、
請求項22~24のいずれか1項に記載の光通信システム。 - 前記モニタ手段は、前記光通信ネットワークの運用時に送受信する主光信号における前記受信波形、及び、前記光通信ネットワークの調整時に送受信するトレーニング用光信号の前記受信波形をモニタする、
請求項22~25のいずれか1項に記載の光通信システム。 - 前記トレーニング用光信号の帯域幅を、前記WDM信号光に挿入する前記光信号または前記WDM信号光から分岐する前記光信号の波長を選択するフィルタにより狭窄化された帯域幅よりも小さくする、
請求項26に記載の光通信システム。 - 前記光通信ネットワークに新たな光通信装置を接続した場合、前記光通信ネットワークを所定の期間毎に検査する場合、及び、前記光通信ネットワークにおける経路を変更する場合のうち、少なくともいずれかの場合に、前記トレーニング用光信号の送受信を行う、
請求項26または27に記載の光通信システム。
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