WO2013186842A1 - 光伝送装置 - Google Patents
光伝送装置 Download PDFInfo
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- WO2013186842A1 WO2013186842A1 PCT/JP2012/064942 JP2012064942W WO2013186842A1 WO 2013186842 A1 WO2013186842 A1 WO 2013186842A1 JP 2012064942 W JP2012064942 W JP 2012064942W WO 2013186842 A1 WO2013186842 A1 WO 2013186842A1
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- optical
- output
- wavelength selective
- selective switch
- wavelength
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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
- H04B10/07955—Monitoring or measuring power
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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
- H04B10/0797—Monitoring line amplifier or line repeater equipment
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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
- H04B10/564—Power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
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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
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0003—Details
Definitions
- the technology disclosed in the present application relates to an optical transmission apparatus.
- optical transmission devices such as an optical add / drop device suitably used in an optical communication system have been required to have multiple nodes for constructing a photonic network.
- Ability to freely switch optical signal paths, including not only point-to-point transmission, but also optical add / drop (Optical Add / Drop Multiplexing: OADM) and wavelength cross connect functions (wavelength cross-connect: WXC or optical hub) Is required.
- the following three functions are listed as functions required for future optical add / drop multiplexers.
- One is a colorless function that can add and drop arbitrary wavelengths.
- the other is a directionless function that can insert (add) and branch (drop) an arbitrary route.
- the other is a contentionless function that can add and drop the same wavelength without collision.
- CDC Colorless, Directionless and Contentionless functions
- wavelength selective switch with 1 port input and multiple port output in optical transmission equipment such as optical add / drop multiplexers that satisfy 2 (Colorless and Directionless) or 3 (Colorless, Directionless and Contentionless) functions are preferably used.
- wavelength selective switch Wavelength selective switch
- the technology disclosed in the present application is based on such knowledge, and one purpose thereof is light that can be controlled so that the optical power of each wavelength signal output from a plurality of output ports of the wavelength selective switch becomes a predetermined value. It is to provide a transmission apparatus.
- an optical transmission device including a wavelength selective switch having a plurality of output ports, a light intensity monitor device, and a control unit.
- the optical intensity monitor device receives optical signals output from the plurality of output ports of the wavelength selective switch, and monitors the optical intensity of the optical signal.
- the control unit controls the light intensity of the optical signal output from the plurality of output ports of the wavelength selective switch based on the light intensity monitored by the light intensity monitoring device.
- FIG. 1 is a schematic configuration diagram for explaining an optical transmission node device that performs optical add / drop of the first embodiment of the technology disclosed in the present application.
- FIG. 2 is a diagram for explaining an optical signal output from the wavelength selective switch.
- FIG. 3 is a diagram for explaining the adjustment of the optical power of the optical signal output from the wavelength selective switch.
- FIG. 4 is a diagram for explaining an optical signal output from the wavelength selective switch.
- FIG. 5 is a diagram for explaining the optical signal after adjustment of the optical power of the optical signal output from the wavelength selective switch.
- FIG. 6 is a schematic configuration diagram for explaining an optical transmission node device according to the second embodiment of the technology disclosed in the present application.
- FIG. 7 is a schematic configuration diagram for explaining an optical transmission node device according to a third embodiment of the technology disclosed in the present application.
- FIG. 8 is a schematic configuration diagram for explaining an optical transmission node device according to a fourth embodiment of the technology disclosed in the present application.
- FIG. 9 is a schematic configuration diagram for explaining an optical transmission node device according to a fifth embodiment of the technology disclosed in the present application.
- the optical transmission node device 1 includes optical amplifiers 101 # 1 to 101 # L, optical amplifiers 102 # 1 to 102 # L, and optical splitters 103 # 1 to 103. #L and wavelength selective switches 104 # 1-104 # L.
- the optical transmission node device 1 further includes a wavelength selective switch 111, an optical amplifier 112, a wavelength selective switch 113, optical amplifiers 114 # 1 to 114 # M, and splitters 115 # 1 to 115 # M.
- the optical transmission node device 1 further includes transponders 117 # 1 # 1 to 117 # 1 # N... 117 # M # 1 to 117 # M # N, optical couplers 121 # 1 to 121 # M, and optical couplers.
- the optical transmission node device 1 further includes transponders 137 # 1 # 1 to 137 # 1 # N ... 137 # M # 1 to 137 # M # N.
- the optical transmission node device 1 further includes optical couplers 123 # 1 to 123 # M, optical amplifiers 135 # 1 to 135 # M, a wavelength selective switch 133, an optical amplifier 132, and a splitter 131. .
- the optical transmission node device 1 uses the wavelength selective switches 104 # 1 to 104 # L to pass (through) or block (block) the optical signal transmitted from the upstream fiber transmission line and insert (add) it. The transmitted optical signal is sent to the next fiber transmission line. Further, the optical splitters 103 # 1 to 103 # L are used to pass the optical signal transmitted from the upstream fiber transmission path (route) and to branch (drop) a part thereof. It also has the function of an optical hub that receives and transmits optical signals from other fiber transmission lines (# 2 to # (L-1)).
- a maximum N ⁇ M wavelength-multiplexed optical signal transmitted from the fiber transmission line # 1 is amplified by the optical amplifier 101 # 1, and is amplified by the optical splitter 103 # 1 having 1 port input and (L + 1) port output (L + 1). )
- the power is divided into individual routes. Of the optical signals branched in (L + 1) paths, one is used for the loop, and the other is for (L + 1) port input, 1 port output wavelength selection for fiber transmission path #M. Sent to the switch 104 # L.
- the other (L-2) optical signals are sent to (L + 1) port input and 1 port output wavelength selective switches (not shown) for fiber transmission lines # 2 to # (L-1), respectively.
- the remaining one optical signal is sent to the wavelength selective switch 111 of L port input and 1 port output.
- a maximum N ⁇ M wavelength multiplexed optical signal transmitted from the fiber transmission line #L is amplified by the optical amplifier 101 # L, and is output by the optical splitter 103 # L having 1 port input and (L + 1) port output.
- the power is branched into (L + 1) routes.
- the optical signals branched in (L + 1) paths one is used for the loop, and the other is for (L + 1) port input, 1 port output wavelength selection for fiber transmission path # 1 Sent to the switch 104 # 1.
- the other (L-2) optical signals are sent to (L + 1) port input and 1 port output wavelength selective switches (not shown) for fiber transmission lines # 2 to # (L-1), respectively.
- the remaining one optical signal is sent to the wavelength selective switch 111 of L port input and 1 port output.
- a maximum N ⁇ M wavelength multiplexed optical signal transmitted from any one of the fiber transmission lines # 2 to # (L-1) is amplified by an optical amplifier (not shown).
- the optical signal of maximum N ⁇ M wavelength multiplexing is branched into (L + 1) paths by a 1-port input and (L + 1) -port output optical splitter (not shown).
- the optical signals branched in (L + 1) paths one is used for the loop, and the other is for (L + 1) port input, 1 port output wavelength selection for fiber transmission path # 1 Sent to the switch 104 # 1.
- the other one is sent to the wavelength selective switch 104 # L for (L + 1) port input and 1 port output for the fiber transmission line #L.
- the other (L-3) optical signals are wavelength selection of (L + 1) port input and 1 port output for fiber transmission lines # 2 to # (L-1) other than any one of the fiber transmission lines. Each is sent to a switch (not shown). The remaining one optical signal is sent to the wavelength selective switch 111 of L port input and 1 port output.
- the maximum N ⁇ M wavelengths input from any one of the optical splitters 103 # 1 to 103 # L Multiplexed optical signals are selected and output by the wavelength selective switch 111.
- the maximum N ⁇ M wavelength multiplexed optical signal output from the wavelength selective switch 111 is input to the optical amplifier 112 and amplified by the optical amplifier 112.
- the optical signal amplified by the optical amplifier 112 is input to the wavelength selective switch 113 having 1 port input and M port output.
- the maximum N ⁇ M wavelength multiplexed optical signal input to the wavelength selective switch 113 is output as M optical signals (each up to N wavelength multiplexed) by the wavelength selective switch 113 according to the wavelength.
- M optical signals each up to N wavelength multiplexed
- optical signals of each wavelength are output to only one output port, and optical signals of the same wavelength are not output to different output ports.
- the M optical signals output from the wavelength selective switch 113 are input to the optical amplifiers 114 # 1 to 114 # M, and are amplified by the optical amplifiers 114 # 1 to 114 # M, respectively.
- the M optical signals amplified by the optical amplifiers 114 # 1 to 114 # M are respectively input to 1-port input and N-port output splitters (SPLs) 115 # 1 to 115 # M.
- SPLs 1-port input and N-port output splitters
- the M optical signals (maximum N wavelength multiplexing respectively) input to the splitters 115 # 1 to 115 # M are branched into N optical signals by the splitters 115 # 1 to 115 # M, respectively.
- the optical signals branched into N by the splitters 115 # 1 to 115 # M are respectively N transponders (TP) 117 # 1 # 1 to 117 # 1 # N... 117 # M # 1 to 117. Each is input to # M # N. It should be noted that transponders 117 # 1 # 1 to 117 # 1 # N... 117 # M # 1 to 117 # M # N are tunable transponders and are transponders that can handle arbitrary wavelengths. Accordingly, each of the splitters 115 # 1 to 115 # M is branched into N, and each can handle an optical signal having an arbitrary wavelength among optical signals multiplexed at N wavelengths.
- a tunable filter (TF: Tunable) is provided between the splitters 115 # 1 to 115 # M and the transponders 117 # 1 # 1 to 117 # 1 # N... 117 # M # 1 to 117 # M # N.
- Filter 116 # 1 # 1 to 116 # 1 # N... 116 # M # 1 to 116 # M # N may be inserted.
- Tunable filters 116 # 1 # 1 to 116 # 1 # N... 116 # M # 1 to 116 # M # N are the maximum N wavelength multiplexed optical signals output from the splitters 115 # 1 to 115 # M. Among them, an optical signal having an arbitrary wavelength can be extracted.
- the wavelength selective switch is a device that can switch the route for each wavelength and can select any route for any wavelength.
- the wavelength selective switch can also send out only what is necessary from a plurality of routes and shut off the others.
- the L-port input and 1-port output wavelength selective switch 111 selects and outputs an optical signal from any one path out of L paths, and outputs it from the other paths. The incoming optical signal can be blocked.
- the wavelength selective switch can select such a route for each wavelength.
- the 1-port input and M-port output wavelength selective switch 113 can output an optical signal having an arbitrary wavelength among input optical signals to any of M paths.
- the optical transmission node device 1 On the drop side of the optical transmission node device 1, among the maximum N ⁇ M wavelength multiplexed optical signals transmitted from the fiber transmission lines # 1 to #L, those transmitted from an arbitrary fiber transmission line are used. Can be dropped on any transponder (Directionless). Further, an optical signal having an arbitrary wavelength can be dropped on an arbitrary transponder (Colorless).
- the wavelength selective switch has a function of switching and adjusting the power of the optical signal.
- the power of the optical signal output from the wavelength selective switch 113 is adjusted to a value within a predetermined range by using this optical signal power adjustment function.
- optical couplers 121 # 1 to 121 # M are inserted between the wavelength selective switch 113 with 1 port input and M port output and the optical amplifiers 114 # 1 to 114 # M, respectively.
- Each of the optical signals output from the wavelength selective switch 113 is branched by the optical couplers 121 # 1 to 121 # M, and then the branched optical signal is multiplexed by the optical coupler 123 having an M port input and 1 port output. .
- the optical power for each wavelength of the combined optical signal is detected by one optical channel monitor (OCM: Optical Channel Monitor) 124.
- OCM optical channel monitor
- the control circuit 120 Based on the detection signal of the optical channel monitor 124, the control circuit 120 performs feedback control of the variable attenuation amount in the wavelength selective switch 113 so that the signal light power of each wavelength becomes a desired value.
- the reason why the optical power of the optical signal is adjusted is that it is necessary to suppress the power deviation between wavelengths so as to be within the allowable input power range of an optical receiver such as a transponder.
- the configuration including the optical coupler 123 and the optical channel monitor 124 is an example of a light intensity monitor device.
- optical signals branched by the optical couplers 121 # 1 to 121 # M are multiplexed by the optical coupler 123, and the optical power for each wavelength of the optical signal after multiplexing is one optical channel monitor (OCM: Optical Channel Monitor). It is detected at 124. As a result, one optical channel monitor 124 can be provided.
- OCM Optical Channel Monitor
- the optical signal of each wavelength is output to only one output port, and the optical signal of the same wavelength is output to different output ports. Not. Therefore, even if the optical signals branched by the optical couplers 121 # 1 to 121 # M are combined by the optical coupler 123 having M port input and 1 port output, the light of the same wavelength is overlapped and does not interfere. Therefore, the optical power for each wavelength of the optical signal combined by the optical coupler 123 with M port input and 1 port output can be detected by one optical channel monitor 124. As a result, the number of optical channel monitors 124 can be reduced to one and the cost can be reduced. Further, since no optical switch or the like is used, the output of multiple ports can be monitored at high speed.
- an optical signal A multiplexed with five wavelengths (W1, W2, W3, W4, W5) is input to the wavelength selective switch 113.
- two wavelengths (W1, W4) are output from the output port 113 # 1 and become an optical signal B
- two wavelengths (W2, W5) are output from the output port 113 # 2 and become an optical signal C
- One wavelength (W3) is output from the output port 113 # M and becomes an optical signal D.
- the optical signal B is branched by the optical coupler 122 # 1
- the optical signal C is branched by the optical coupler 122 # 2
- the optical signal C is branched by the optical coupler 122 # M, and is multiplexed by the optical coupler 123, respectively.
- the optical signal E is multiplexed with five wavelengths (W1, W2, W3, W4, W5).
- Transponders 137 # 1 # 1 to 137 # 1 # N... 137 # M # 1 to 137 # M # N are tunable transponders, which are compatible with arbitrary wavelengths. Accordingly, it is possible to output optical signals of N ⁇ M different wavelengths at the maximum.
- Transponders 137 # 1 # 1 to 137 # 1 # N... 137 # M # 1 to 137 # M # N output optical signals of up to N.times.M different wavelengths are N port input, 1 port. Input to the output optical couplers 123 # 1 to 123 # M.
- one of the optical couplers 1235 # 1 to 135 # M is provided for each N transponders.
- An optical coupler is connected.
- optical signals output from N transponders 137 # 1 # 1 to 137 # 1 # N are input to an optical coupler 135 # 1, and are combined by the optical coupler 135 # 1 to be multiplexed at a maximum of N wavelengths. It becomes an optical signal.
- optical signals output from N transponders 137 # M # 1 to 137 # M # N are input to the optical coupler 135 # M, and are combined by the optical coupler 135 # M to have a maximum of N wavelengths. It becomes a multiplexed optical signal.
- Transponders 137 # 1 # 1-137 # 1 # N... 137 # M # 1-137 # M # N and optical couplers 135 # 1-135 # M and tunable filters 136 # 1 # 1 ... 136 # 1 # N... 136 # M # 1 to 136 # M # N may be inserted.
- Tunable filters 136 # 1 # 1-136 # 1 # N ... 136 # M # 1-136 # M # N are transponders 137 # 1 # 1-137 # 1 # N ... 137 # M # 1.
- the optical signal output from ⁇ 137 # M # N is narrowed.
- the maximum N-wavelength multiplexed optical signals respectively output from the M optical couplers 135 # 1 to 135 # M are input to the optical amplifiers 135 # 1 to 135 # M, and the optical amplifiers 135 # 1 to 135 # are output. Each is amplified by M.
- the M optical signals respectively amplified by the optical amplifiers 135 # 1 to 135 # M are input to the M-port input and the 1-port output wavelength selective switch 133, and are combined by the wavelength selective switch 133 so that a maximum of N ⁇ It becomes an M wavelength multiplexed optical signal.
- the optical signal combined by the wavelength selection switch 133 is input to the optical amplifier 132 and amplified by the optical amplifier 132.
- the maximum N ⁇ M wavelength-multiplexed optical signal amplified by the optical amplifier 132 is input to the 1-port input and L-port output splitter 131, and is branched into L by the splitter 131.
- the maximum N ⁇ M wavelength multiplexed optical signals branched into L by the splitter 131 are sent to the (L + 1) port input and 1 port output wavelength selective switches 104 # 1 to 104 # L, respectively.
- the wavelength selective switch 104 # 1 is branched by a splitter 131 and a maximum N ⁇ M wavelength multiplexed optical signal respectively transmitted from the fiber transmission lines # 2 to #L, and is output to the output port 130 # 1.
- the maximum N ⁇ M wavelength multiplexed optical signal is input.
- the wavelength selective switch 104 # 1 selects any one of the maximum N ⁇ M wavelength multiplexed optical signals from the L input optical signals, and the optical amplifier 102 # 1 selects the maximum N ⁇ M wavelength multiplexed optical signal. Is amplified by the optical amplifier 102 # 1 and output to the fiber transmission line 1.
- the wavelength selective switch 104 # L is branched by the splitter 131 and the optical signal of the maximum N ⁇ M wavelength multiplexing respectively transmitted from the fiber transmission lines # 1 to (L-1), and is output to the output port.
- the maximum N ⁇ M wavelength multiplexed optical signal output to 130 # L is input.
- the wavelength selective switch 104 # L selects any one of the maximum N ⁇ M wavelength multiplexed optical signals from the L input optical signals, and the optical amplifier 102 # L Is amplified by the optical amplifier 102 # L and output to the fiber transmission line L.
- a part of the optical signals of the output ports of the wavelength selective switches 104 # 1 to 104 # L with (L + 1) port input and 1 port output are optical couplers 121 # 1 to 121 # L. Each is branched using.
- Optical signal power for each wavelength is detected by the optical channel monitors 122 # 1 to 122 # L for the optical signals branched by the optical couplers 121 # 1 to 121 # L (see FIG. 4).
- the control circuit 120 uses the detected optical signal power for each wavelength, sets the variable attenuation amount in the wavelength selective switches 104 # 1 to 104 # L so that the optical signal power of each wavelength becomes a desired value (see FIG. 5). Each is feedback controlled.
- couplers 135 # 1 to 135 # M and a wavelength selective switch 133 are used, and only a device for adding power of an optical signal is used.
- only the optical amplifiers 134 # 1 to 134 # M and the optical amplifier 132 are used, and no device for limiting the wavelength is used. Therefore, as long as the wavelengths are different from each other, optical signals of arbitrary wavelengths can be added from arbitrary transponders 137 # 1 # 1 to 137 # 1 # N ... 137 # M # 1 to 137 # M # N (Colorless ). Also, optical signals from arbitrary transponders 137 # 1 # 1 to 137 # 1 # N ... 137 # M # 1 to 137 # M # N can be transmitted to an arbitrary fiber transmission line (Directionless).
- a part of the optical signal of each output port of the wavelength selective switch 113 with 1 port input and M port output is respectively transmitted by the optical couplers 121 # 1 to 121 # M.
- Multiple port inputs (for example, 2-port input, 4-port input) are output from the optical couplers 121 # 1 to 121 # M using a 1-port output optical switch (OSW: Optical-Switch) for each appropriate number of output ports. Switch the optical signal.
- OSW Optical-Switch
- the optical switch here has a function of sequentially switching, at a high speed, an input port that passes through an output port with respect to a plurality of input ports.
- two (M / 2) port input and one port output optical switches 125 # 1 and 125 # 2 are used for M optical couplers 121 # 1 to 121 # M. .
- Optical channel monitors 126 # 1 and 126 # 2 are arranged corresponding to the optical switches 125 # 1 and 125 # 2, respectively.
- Optical signals output from the optical couplers 121 # 1 to 121 # (M / 2) are input to the optical switch 125 # 1.
- Optical signals output from the optical couplers 121 # 1 to 121 # (M / 2) are switched by the optical switch 125 # 1 and sequentially input to the optical channel monitor 126 # 1.
- Optical signals output from the optical couplers 121 # (M / 2 + 1) to 121 # M are input to the optical switch 125 # 2.
- Optical signals output from the optical couplers 121 # (M / 2 + 1) to 121 # M are switched by the optical switch 125 # 2 and sequentially input to the optical channel monitor 126 # 2.
- the optical signal power for each wavelength is sequentially detected by the optical channel monitors 126 # 1 and 126 # 2. Using the detected optical signal power for each wavelength, the variable attenuation amount in the wavelength selective switch 113 is feedback controlled by the control circuit 120 so that the optical signal power of each wavelength becomes a desired value.
- the optical signal from the output port of the wavelength selective switch 113 with 1 port input and M port output is sequentially switched by the optical switches 125 # 1 and 2 #, and the optical channel monitor 126 # 1 with 1 port input sequentially. It is input to 126 # 2. Therefore, the present embodiment has an advantage that it is less susceptible to the optical loss variation between the output ports of the wavelength selective switch 113 having the 1-port input and the M-port output as compared with the configuration of the first embodiment.
- the configuration including the optical switches 125 # 1 and 2 and the optical channel monitors 126 # 1 and 126 # 2 is an example of a light intensity monitor device.
- 1-port input optical channel monitors 126 # 1 and 126 # 2 are arranged for two (M / 2) port input and 1-port output optical switches 125 # 1 and 125 # 2, respectively. is doing.
- the structure which reduces the number of optical channel monitors using the optical channel monitor of 2 port input or 4 port input is also considered.
- a part of the optical signal output from each output port of the wavelength selective switch 113 with 1 port input and M port output is converted into optical couplers 121 # 1 to 121 #. Branch at M respectively.
- the branched M optical signals are respectively input to the M optical channel monitors 122 # 1 to 122 # M, and the optical power of each optical signal channel is detected by the optical channel monitors 122 # 1 to 122 # M.
- the control circuit 120 feedback-controls the variable attenuation amount in the wavelength selective switch 113 so that the signal light power of each wavelength becomes a desired value.
- the optical channel monitors 122 # 1 to 122 # M are examples of a light intensity monitor device.
- the output optical signal is detected by one optical channel monitor 124.
- the monitor configuration of the wavelength selective switch 113 of the drop-side 1-port input and M-port output is the same as that of the first embodiment described with reference to FIG. Yes.
- the configuration of the second embodiment described with reference to FIG. 6 or the configuration of the third embodiment described with reference to FIG. 7 can be used.
- an optical switch 127 having a plurality of ports (two ports in the present embodiment) input and one port output is inserted in front of the optical channel monitor 124.
- the optical coupler 138 branches a part of the optical signal output from the output port of the wavelength selection switch 133 of the M port input and 1 port output on the add side.
- the branched optical signal is input to the optical switch 127.
- the optical switch 127 sequentially switches the add-side monitor signal and the drop-side monitor signal at a high speed, so that the optical power for each channel of the add and drop optical signals is detected by one optical channel monitor 124.
- the control circuit 120 feedback-controls the variable attenuation amount in the wavelength selective switch 113 and the wavelength selective switch 133 so that the signal light power of each wavelength becomes a desired value.
- the configuration including the optical coupler 123, the optical channel monitor 124, and the optical switch 127 is an example of a light intensity monitor device.
- the optical transmission node device 5 includes optical amplifiers 101 # 1 to 101 # L, optical amplifiers 102 # 1 to 102 # L, and optical splitters 103 # 1 to 103. #L and wavelength selective switches 104 # 1-104 # L.
- the optical transmission node device 5 further includes wavelength selective switches 211 # 1 to 211 # L, optical amplifiers 212 # 1 # 1 to 212 # 1 # R, 212 # L # 1 to 212 # L # R, Multicast switches 213 # 1 to 213 # R.
- the optical transmission node device 5 further includes transponders 215 # 1 # 1 to 215 # 1 # Q... 215 # R # 1 to 215 # R # Q.
- the optical transmission node device 5 further includes transponders 235 # 1 # 1 to 235 # 1 # Q ... 235 # R # 1 to 235 # R # Q.
- the optical transmission node device 5 further includes multicast switches 233 # 1 to 233 # R, optical amplifiers 232 # 1 # 1 to 232 # 1 # R... 232 # L # 1 to 232 # L # R, and couplers. 231 # 1 to 232 # L.
- L optical signals respectively output from the L optical splitters 103 # 1 to 103 # L are wavelengths of 1-port input and R-port output. Each is input to the selection switches 211 # 1 to 211 # L.
- the L optical signals respectively input to the wavelength selective switches 211 # 1 to 211 # L are output as R optical signals according to the wavelengths by the wavelength selective switches 211 # 1 to 211 # L. .
- the L ⁇ R optical signals output from the wavelength selective switches 211 # 1 to 211 # L are optical amplifiers 212 # 1 # 1 to 212 # 1 # R... 212 # L # 1 to 212 # L # R. Are amplified by optical amplifiers 212 # 1 # 1 to 212 # 1 # R... 212 # L # 1 to 212 # L # R, respectively.
- Optical amplifiers 212 # 1 # 1 to 212 # 1 # R ... L ⁇ R optical signals amplified by 212 # L # 1 to 212 # L # R are respectively R of the L port input and the Q port output. Are input to a plurality of multicast switches (MCS: Multicast Switch) 213 # 1 to 213 # R.
- MCS Multicast Switch
- the L optical signals respectively input to the multicast switches 213 # 1 to 213 # R are switched by the multicast switches 213 # 1 to 213 # R and output to Q output ports, respectively.
- the optical signals output to the Q output ports of the multicast switches 213 # 1 to 213 # R are respectively transponders 215 # 1 # 1 to 215 # 1 # Q... 215 # R # 1 to 215 # R #. Output to Q.
- a tunable filter is provided between the multicast switches 213 # 1 to 213 # R and the transponders 215 # 1 # 1 to 215 # 1 # Q... 215 # R # 1 to 215 # R # Q.
- 214 # 1 # 1 to 214 # 1 # Q ... 214 # R # 1 to 214 # R # Q may be inserted, respectively.
- R multicast switches of L port input and Q port output are devices that can arbitrarily switch between the L port on the input side and the Q ports on the output side, and even if they are optical signals of the same wavelength, Switching is possible without causing interference.
- the 1-port input and R-port output wavelength selective switches 211 # 1-211 # L output optical signals of any wavelength among the input optical signals to any of R ⁇ M paths. can do. Therefore, on the drop side of the optical transmission node device 5, the optical signals transmitted from the fiber transmission paths # 1 to #L, respectively, transmitted from any fiber transmission path can be dropped to any transponder. (Directionless). Also, an optical signal with an arbitrary wavelength can be dropped on an arbitrary transponder (Colorless), and even optical signals with the same wavelength can be switched without interfering with each other (Contentionless).
- the same monitor as that of the first embodiment described with reference to FIG. 1 is connected to the output ports of the wavelength selective switches 211 # 1 to 211 # L with one port input and R port output.
- control configurations can be used.
- the monitor and control configuration of the second embodiment described with reference to FIG. 6 and the monitor and control configuration of the third embodiment described with reference to FIG. 7 can also be used.
- the optical signal power for each wavelength is detected, and the wavelength selective switches 211 # 1-211 are used so that the optical signal power for each wavelength becomes a desired value using the detected optical signal power for each wavelength.
- the variable attenuation amount in #L can be feedback-controlled.
- transponders 215 # 1 # 1 to 215 # 1 # Q... 215 # R # 1 to 215 # R # Q and other optical receivers have a power deviation between wavelengths so that they fall within the allowable input power range. Can be suppressed.
- transponders 235 # 1 # 1 to 235 # 1 # Q... 235 # R # 1 to 235 # R # Q are tunable transponders and can be adapted to any wavelength. Therefore, an optical signal having an arbitrary wavelength can be output.
- Transponders 235 # 1 # 1 to 235 # 1 # Q... 235 # R # 1 to 235 # R # Q output optical signals from R multicast switches 233 # 1 with Q port input and L port output. To 233 # R.
- Q optical signals respectively input to the multicast switches 233 # 1 to 233 # R are switched by the multicast switches 233 # 1 to 233 # R and output to L output ports, respectively.
- the total L ⁇ R optical signals output to the L output ports of the multicast switches 233 # 1 to 233 # R are the optical amplifiers 232 # 1 # 1 to 232 # 1 # R... 232 # L #. 1 to 232 # L # R, and amplified by optical amplifiers 232 # 1 # 1 to 232 # 1 # R... 232 # L # 1 to 232 # L # R, respectively.
- a tunable filter 234 # 1 is provided between the transponders 235 # 1 # 1 to 235 # 1 # Q... 235 # R # 1 to 235 # R # Q and the multicast switches 233 # 1 to 233 # R. # 1 to 234 # 1 # Q... 234 # R # 1 to 234 # R # Q may be inserted, respectively.
- Tunable filters 234 # 1 # 1 to 234 # 1 # Q ... 234 # R # 1 to 234 # R # Q are transponders 235 # 1 # 1 to 235 # 1 # Q ... 235 # R # 1.
- the optical signal output from 235 # R # Q is narrowed.
- Optical amplifiers 232 # 1 # 1 to 232 # 1 # R... 232 # L # 1 to 232 # L # R L ⁇ R optical signals amplified respectively are L R port inputs and 1 port outputs. Are input to the couplers 231 # 1 to 232 # L. In each of the couplers 231 # 1 to 232 # L, R optical signals are combined into one optical signal.
- optical signals combined by the couplers 231 # 1 to 232 # L are sent to the (L + 1) port input and 1 port output wavelength selective switches 104 # 1 to 104 # L, respectively.
- an optical signal is output to one of the fiber transmission lines 1 to L.
- Couplers 231 # 1 to 231 # L On the add side of the optical transmission node device 5, couplers 231 # 1 to 231 # L, input ports, multicast switches 233 # 1 to 233 # R, and optical amplifiers 232 # 1 # 1 to 232 # L # R It is only using.
- the couplers 231 # 1 to 231 # L are devices that only add optical signal power.
- the multicast switches 233 # 1 to 233 # R are devices that arbitrarily switch between an input side port and an output side port.
- no device that limits the wavelength is used. Therefore, an optical signal having an arbitrary wavelength can be added from an arbitrary transponder 235 # 1 # 1 to 235 # 1 # Q... 235 # R # 1 to 235 # R # Q (Colorless).
- optical signals from arbitrary transponders 235 # 1 # 1 to 235 # 1 # Q... 235 # R # 1 to 235 # R # Q can be transmitted to an arbitrary fiber transmission line (Directionless). Further, even optical signals having the same wavelength can be switched and added without causing interference (Contentionless).
- an optical add / drop node device having a colorless and directionless function or an optical add / drop node device having a CDC function colorless, directionless, contentionless.
- OCM optical channel monitor
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Abstract
Description
Claims (12)
- 複数の出力ポートを有する波長選択スイッチと、
前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号を受け、前記光信号の光強度をモニタする光強度モニタデバイスと、
前記光強度モニタデバイスでモニタされた光強度に基づいて、前記波長選択スイッチの前記複数の出力ポートからの前記光信号の光強度を制御する制御部と、
を備える光伝送装置。 - 前記光強度モニタデバイスは、前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号を受け、前記複数の出力ポートからそれぞれ出力された光信号を合波し、合波された光信号を出力する合波デバイスと、前記合波された光信号を受けて前記合波された光信号の光強度をモニタする第2の光強度モニタデバイスと、を備える請求項1記載の光伝送装置。
- 前記光強度モニタデバイスは、複数の入力ポートを備え、前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号を前記複数の入力ポートで受け、前記複数の入力ポートで受けた前記光信号を切り替えて出力する光スイッチと、前記光スイッチから出力された光信号の光強度をモニタする第2の光強度モニタデバイスと、を備える請求項1記載の光伝送装置。
- 前記光強度モニタデバイスは、それぞれ複数の入力ポートを備え、前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号を前記複数の入力ポートで受け、前記複数の入力ポートで受けた前記光信号を切り替えて出力する複数の光スイッチと、前記複数の光スイッチから出力された光信号の光強度をそれぞれモニタする複数の第2の光強度モニタデバイスと、を備える請求項1記載の光伝送装置。
- 前記光強度モニタデバイスは、前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号をそれぞれ受け、前記光信号の光強度をそれぞれモニタする複数の第2の光強度モニタデバイスを備える請求項1記載の光伝送装置。
- 複数の入力ポートを有する第2の波長選択スイッチをさらに備え、
前記波長選択スイッチはドロップ側に配置され、
前記第2の波長選択スイッチはアド側に配置され、
前記光強度モニタデバイスは、前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号に基づく光信号と、前記第2の波長選択スイッチから出力される光信号とを切り替えて、前記第2の光強度モニタデバイスに入力する第2の光スイッチをさらに備える請求項1~請求項5のいずれか1項に記載の光伝送装置。 - 前記第2の光強度モニタデバイスは光チャネルモニタである請求項1~請求項6のいずれか1項に記載の光伝送装置。
- 前記光チャネルモニタはチャネル毎の光強度をモニタする請求項7記載の光伝送装置。
- 前記光チャネルモニタは一つの入力ポートを備える請求項7または請求項8記載の光伝送装置。
- 前記光チャネルモニタは複数の入力ポートを備える請求項7または請求項8記載の光伝送装置。
- 前記波長選択スイッチの前記複数の出力ポートからそれぞれ出力された光信号を分岐し、分岐した光信号を前記光強度モニタデバイスに入力する分岐デバイスをさらに備える請求項1~請求項6のいずれか1項に記載の光伝送装置。
- 波長選択スイッチの複数の出力ポートからそれぞれ出力された光信号を受け、前記光信号の光強度を光強度モニタデバイスでモニタし、
前記光強度モニタデバイスでモニタされた光強度に基づいて、前記波長選択スイッチの前記複数の出力ポートからの前記光信号の光強度を制御することを備える光伝送方法。
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JP2014520828A JPWO2013186842A1 (ja) | 2012-06-11 | 2012-06-11 | 光伝送装置 |
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JP6615887B2 (ja) * | 2014-11-26 | 2019-12-04 | ニスティカ,インコーポレーテッド | カラーレス、ディレクションレスおよびコンテンションレスのネットワークノード |
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