WO2022168354A1 - 光通信システム、制御装置、及び、品質補償方法 - Google Patents
光通信システム、制御装置、及び、品質補償方法 Download PDFInfo
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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
- H04Q11/0062—Network aspects
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
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Definitions
- the present invention relates to an optical communication system, a control device, and a quality compensation method.
- PtP WDM-PON is a PON system that performs wavelength multiplexing.
- communication is performed using different optical wavelengths for each ONU in the upstream direction and the downstream direction.
- the upstream direction is the direction from the ONU to the OLT.
- the downstream direction is the direction from the OLT to the ONUs.
- a management control signal called AMCC is used between the OLT and ONU as a signal for management and control.
- the AMCC signal is a signal that is superimposed on a main signal and transmitted after information to be transmitted is modulated in a predetermined manner.
- the OLT and ONU can transmit a signal for management and control within the wavelength band of the optical wavelength used for the main signal. That is, management and control are realized without using a dedicated optical wavelength band for management and control.
- a wavelength determination process in which upstream and downstream optical wavelengths are determined is performed using the AMCC signal.
- FIG. 31 is a diagram showing a configuration example of a PtP WDM-PON system.
- the figure shows a configuration relating to superimposition of the AMCC signal.
- the OLT and ONUs contain management controls.
- the AMCC signals are superimposed in the optical stage and separated in the electrical stage.
- FIG. 32 shows an example of an optical signal transmitted from an ONU or OLT.
- the transmitted optical signal is the main signal on which the management control signal is superimposed.
- intensity modulation is added to the envelope of the main signal as shown in FIG.
- the data rate of the main signal is a high-speed signal on the order of Gb/s (gigabits per second).
- the data rate of the management control signal is expected to be a low speed signal on the order of kb/s (kilobits per second) (eg Non-Patent Document 2).
- the All-Photonics Network is an innovative network based on photonics technology.
- development aimed at realizing APN is being carried out (see, for example, Non-Patent Document 3).
- optical nodes relay optical backbone networks and optical access networks to provide end-to-end optical paths for each service.
- the optical node is assumed to be an optical SW (Switch) or the like.
- FIG. 33 is a diagram showing the configuration of an optical communication system 910 in APN (see, for example, Non-Patent Document 4).
- the optical communication system 910 has a subscriber unit 920 , an optical SW 930 , a wavelength multiplexing/demultiplexing unit 940 , an optical transmission line 950 and a management control device 970 .
- the two optical SWs 930 are described as optical SWs 930a and 930b.
- the two subscriber units 920 connected to the optical SW 930a are referred to as subscriber units 920a-1 and 920a-2, and the two subscriber units 920 connected to the optical SW 930b are referred to as the subscriber unit 920b-1. , 920b-2.
- the two wavelength multiplexing/demultiplexing units 940 connected to the optical SW 930a are referred to as wavelength multiplexing/demultiplexing units 940a-1 and 940a-2. These are referred to as branching units 940b-1 and 940b-2.
- the optical SW 930a and the optical SW 930b are connected by a plurality of optical transmission lines 950.
- subscriber units 920a-n communicate with subscriber units 920b-n.
- the optical signals output by the subscriber units 920a-n and received by the subscriber units 920b-n have the wavelength ⁇ nu.
- a wavelength ⁇ nd is used for the signal.
- Opposite subscriber units 920a-n and 920b-n are connected via optical SWs 930a and 930b, wavelength multiplexing/demultiplexing units 940a-n and 940b-n, and optical transmission lines 950-n. .
- the optical SW 930 outputs light input from the input port 931 from the output port 932 and outputs light input from the output port 932 from the input port 931 .
- Optical SW 930 can change the connection between input port 931 and output port 932 .
- the wavelength multiplexing/demultiplexing unit 940 multiplexes optical signals of different wavelengths input from a plurality of separate ports, and outputs the multiplexed optical signal from a single port. Also, the wavelength multiplexing/demultiplexing unit 940 demultiplexes optical signals of different wavelengths input from a single port, and outputs the demultiplexed optical signals from separate ports.
- an AWG Arrayed Waveguide Grating
- the optical transmission line 950 through which the optical signal passes can be selected.
- a management control device 970 connected to the optical SW determines and instructs the transmission/reception wavelength of each subscriber unit 920 and the relationship between the input port and the output port of the optical SW 930 .
- the optical communication system 910 includes the optical SW 930 and the wavelength multiplexing/demultiplexing unit 940 so that the optical signal output from the subscriber unit 920 can be transmitted using the selected optical transmission line 950 .
- the optical communication system 910 is configured to connect the subscriber unit 920a. -1 and subscriber unit 920b-1.
- Signal parameters represent, for example, baud rate, modulation scheme, output light intensity, and the like. By changing the baud rate, modulation method, and output light intensity values represented by the signal parameters, subscriber unit 920a-1 and subscriber unit 920b-1 can receive signals with good quality.
- FIG. 34 is a sequence diagram showing operations up to main signal conduction that can be easily considered in the optical communication system 910 of FIG.
- the subscriber unit 920a-1 connects to the optical SW 930a (step S901).
- the subscriber unit 920b-1 connects to the optical SW 930b (step S902).
- the subscriber device 920a-1 transmits a connection request to the subscriber device 920b-1 to the management control device 970 (step S903).
- the management control device 970 determines the communication wavelength used between the subscriber device 920a-1 and the subscriber device 920b-1, the optical transmission line 950, and the signal parameter values (step S904). Thereafter, the management control device 970 notifies the subscriber device 920a-1 and the subscriber device 920b-1 of the communication wavelength and signal parameters (steps S905 and S906). Management control device 970 sets the value determined in step S904 to this signal parameter. Further, the management control device 970 determines the port connection relationship between the optical SW 930a and the optical SW 930b (step S907). A port connection relation is a connection between an input port 931 and an output port 932 .
- This port connection relationship is set so that a transmission signal from subscriber unit 920a-1 is output to subscriber unit 920b-1 through selected optical transmission line 950-1.
- the management control device 970 notifies the determined port connection relationship to the optical SW 930a and the optical SW 930b (steps S908 and S909).
- the optical SW 930a and the optical SW 930b set the connection between the input port 931 and the output port 932 according to the port connection relationship notified from the management control device 970 (steps S910 and S911).
- the subscriber device 920a-1 and the subscriber device 920b-1 set the communication wavelength and signal parameters notified from the management control device 970 (steps S912 and S913).
- the management control device 970 determines the communication wavelength, optical transmission line 950, and signal parameter values.
- optical communication system 910 may operate as shown in FIG. That is, after the processing of steps S901 to S903 in FIG. 34, the management control device 970 determines the communication wavelength and the optical transmission line 950 (step S931), The communication wavelength is notified (steps S932 and S933).
- the optical communication system 910 performs the processing of steps S907 to S911 in FIG.
- the subscriber device 920a-1 and the subscriber device 920b-1 set the notified communication wavelength (steps S934 and S935).
- the subscriber unit 920a-1 and the subscriber unit 920b-1 mutually transmit and receive control signals and the like to estimate the state of the optical transmission path (steps S936 and S937).
- the subscriber device 920a-1 and the subscriber device 920b-1 determine the value of the signal parameter based on the estimation result, and set the determined value of the signal parameter (steps S938 and S939). After that, transmission of the main signal between the subscriber device 920a-1 and the subscriber device 920b-1 is started (steps S914 and S915).
- the optical communication system 910 may operate as shown in FIG. That is, subscriber unit 920a-1 and subscriber unit 920b-1 use fixed values of signaling parameters. Therefore, the optical communication system 910 does not perform the processing of steps S936 to S939 of FIG. 35 for determining the value of the signal parameter and setting the signal parameter to the determined value.
- FIG. 37 is a diagram showing a distance-adaptive optical transmission system.
- the distance adaptive optical transmission system has two transceivers 980 facing each other.
- the two transceivers 980 are denoted as transceivers 980a and 980b, respectively.
- Transmitter 981a of transceiver 980a and receiver 982b of transceiver 980b are connected via fiber 983-1, and transmitter 981b of transceiver 980b and receiver 982a of transceiver 980a are connected via fiber 983-2.
- a signal frame containing data and pilot sequences is transmitted from transmitter 981a to receiver 982b via fiber 983-1.
- Transceiver 980b selects the appropriate signal format for fiber 983-1 by comparing the OSNR estimated by receiver 982b with a reference OSNR threshold database. This OSNR threshold database is designed before transmission.
- the signal format information is then sent by the feedback channel from transmitter 981b back to receiver 982a over fiber 983-2.
- the information is then demodulated from the feedback channel at receiver 982a and provided to transmitter 981a.
- transceiver 980a configures transmitter 981a with the appropriate signal format for transmission on fiber 983-1.
- the receiver 982b estimates the OSNR using the PS.
- the signal power and noise power are calculated from the data spectrum and PS spectrum, respectively.
- FIG. 37 shows the frame structure of the transmission signal.
- PS is an alternating sequence of binary symbols of 0 and 1 whose complex amplitudes are arbitrary values of S and -S.
- FIG. 37 shows the spectrum of PS. Since the PS signal can be regarded as a BPSK (Binary Phase Shift Keying) modulated signal, its spectrum has two peak components including noise components. When there are four periods of PS, such as alternating S, S, ⁇ S, and ⁇ S, the peak component is ⁇ Rs/4, where Rs is the baud rate.
- BPSK Binary Phase Shift Keying
- receiver 982b corrects chromatic dispersion (CD) by frequency domain equalization (FDE) after detecting a transmitted signal.
- CD chromatic dispersion
- FDE frequency domain equalization
- the value of CD is estimated by calculating the delay time difference between PS spectra.
- the receiver 982b extracts PS from the received signal train and calculates noise power from frequency elements near DC.
- Receiver 982b obtains the signal power from the spectrum of the data stream sampled at another time instant in which no PS is present.
- the transmission optical fiber currently in general use has a chromatic dispersion of approximately 17 ps/nm/km at the communication wavelength of the 1.55 ⁇ m band. Accumulation of this chromatic dispersion hinders high-speed transmission. Therefore, for high-speed transmission, it is necessary to compensate for the accumulated chromatic dispersion of the optical transmission line.
- an object of the present invention is to provide an optical communication system, a control device, and a quality compensation method capable of flexibly compensating the quality of optical signals.
- An optical communication system includes an optical switch that has a plurality of ports and outputs an optical signal input from one of the ports from the other ports, and an optical signal output from the optical switch. a plurality of quality compensating units for compensating for quality and inputting the quality-compensated optical signal into the optical switch; a process of selecting a quality compensator for compensating quality according to the degree of quality deterioration of said optical signal when it is transmitted through a path; and a control unit for controlling the optical switch so that the selected optical signal whose quality has been compensated by the quality compensating unit is output from the port corresponding to the destination of the optical signal.
- a management control device is a plurality of quality compensating units connected to an optical switch that outputs an optical signal input from one of a plurality of ports from the other port, wherein the optical switch a selection unit for selecting a quality compensating unit for compensating for quality according to the degree of quality deterioration of the optical signal input from a predetermined port of the optical signal when the optical signal is transmitted through a transmission line;
- the optical switch outputs the optical signal whose quality is compensated by the selected quality compensating unit to the selected quality compensating unit, and outputs the optical signal whose quality has been compensated by the selected quality compensating unit from the port corresponding to the destination of the optical signal.
- an instruction unit for instructing to.
- a quality compensation method includes a transfer step in which an optical switch having a plurality of ports outputs an optical signal input from one of the ports from another of the ports; a quality compensating step of compensating the quality of the optical signal output from and inputting the quality-compensated optical signal to the optical switch; and a process of selecting a quality compensator for compensating quality according to the degree of quality deterioration of said optical signal when said optical signal input from a predetermined port of said optical switch is transmitted through a transmission line; An optical signal input from a port is output to the selected quality compensator, and an optical signal whose quality has been compensated by the selected quality compensator is output from a port corresponding to the destination of the optical signal. and a control step of controlling the optical switch.
- a quality compensation method is characterized in that, among a plurality of quality compensation units connected to an optical switch that outputs an optical signal input from one of a plurality of ports from the other port, the optical switch a selection step of selecting a quality compensator for compensating for quality in accordance with the degree of quality deterioration of said optical signal when said optical signal input from a predetermined port is transmitted through a transmission line;
- the optical switch outputs the optical signal whose quality is compensated by the selected quality compensating unit to the selected quality compensating unit, and outputs the optical signal whose quality has been compensated by the selected quality compensating unit from the port corresponding to the destination of the optical signal. and a directing step of directing to.
- the present invention makes it possible to flexibly compensate for the quality of optical signals in an optical communication system.
- FIG. 1 is a diagram showing the configuration of an optical communication system according to a first embodiment of the present invention
- FIG. It is a figure which shows the 1st parameter table
- FIG. 10 is a diagram showing the configuration of an optical communication system according to a second embodiment
- FIG. 13 is a diagram showing the configuration of an optical communication system according to a third embodiment
- FIG. FIG. 12 is a diagram showing the configuration of an optical communication system according to a fourth embodiment
- FIG. FIG. 12 is a diagram showing the configuration of an optical communication system according to a fifth embodiment
- It is a figure which shows the 2nd parameter table
- FIG. 12 is a diagram showing the configuration of an optical communication system according to a sixth embodiment
- FIG. 12 is a diagram showing the configuration of an optical communication system according to a seventh embodiment
- It is a sequence diagram showing the operation of the optical communication system according to the same embodiment
- FIG. 12 is a diagram showing the configuration of an optical communication system according to an eighth embodiment
- FIG. 22 is a diagram showing the configuration of an optical communication system according to a ninth embodiment
- FIG. 12 is a diagram showing the configuration of an optical communication system according to a sixth embodiment
- FIG. 12 is a diagram showing the configuration of an optical communication system according to a seventh embodiment
- It is a sequence diagram showing the operation of the optical communication system according to the same embodiment
- FIG. 12 is a diagram showing the configuration of an optical communication system according to an eighth embodiment
- FIG. 22 is a diagram showing the configuration of an optical communication system according to a ninth embodiment
- It is a figure which shows the structure of
- FIG. 5 is a sequence diagram showing the operation of selecting a dispersion compensator in the optical communication system according to the same embodiment; It is a figure which shows the calculation method of RTT by the same embodiment.
- FIG. 10 is a diagram showing an example in which an error occurs in the RTT calculation method according to the same embodiment; It is a figure which shows the other calculation method of RTT by the same embodiment. It is a figure which shows the structure of the subscriber unit by the same embodiment. It is a figure which shows the structure of the control-signal extraction apparatus by the same embodiment.
- FIG. 20 is a diagram showing the configuration of an optical communication system according to a tenth embodiment;
- FIG. 12 is a diagram showing the configuration of an optical communication system according to an eleventh embodiment;
- FIG. 22 is a diagram showing the configuration of an optical communication system according to a twelfth embodiment; It is a figure which shows the structure of the subscriber unit by the same embodiment.
- FIG. 4 is a sequence diagram showing operations for setting a dispersion compensation function of the optical communication system according to the same embodiment;
- FIG. 22 is a diagram showing the configuration of an optical communication system according to a thirteenth embodiment;
- FIG. 5 is a sequence diagram showing the operation of selecting a dispersion compensator in the optical communication system according to the same embodiment;
- FIG. 4 is a flowchart showing processing up to main signal conduction between subscriber units of the optical communication system according to the same embodiment;
- FIG. 10 is a diagram showing the hardware configuration of a management control device according to the first to eighth embodiments;
- FIG. 1 is a diagram showing the configuration of a conventional PtP WDM-PON system; 1 is a diagram showing a prior art optical signal; FIG. 1 is a diagram showing the configuration of a conventional optical communication system; FIG. FIG. 3 is a sequence diagram showing the operation of a conventional optical communication system; FIG. 3 is a sequence diagram showing the operation of a conventional optical communication system; FIG. 3 is a sequence diagram showing the operation of a conventional optical communication system; 1 illustrates a prior art distance-adaptive optical transmission system; FIG.
- FIG. 1 is a diagram showing the configuration of an optical communication system 110 according to the first embodiment.
- the optical communication system 110 has a subscriber unit 120 , an optical SW 130 , a wavelength multiplexer/demultiplexer 140 , an optical transmission line 150 , a dispersion compensator 160 and a management controller 170 .
- the optical communication system 110 has multiple optical SWs 130 .
- the two optical SWs 130 are described as optical SWs 130a and 130b.
- the subscriber device 120 connected to the optical SW 130a is referred to as a subscriber device 120a
- the subscriber device 120 connected to the optical SW 130b is referred to as a subscriber device 120b.
- N (N is an integer of 1 or more) subscriber devices 120a are described as subscriber devices 120a-1, ..., 120a-N
- M (M is an integer of 1 or more) subscriber devices 120b are denoted as subscriber units 120b-1, . . . , 120b-M.
- the J wavelength multiplexing/demultiplexing units 140 (J is an integer equal to or greater than 1) connected to the optical SW 130a are referred to as wavelength multiplexing/demultiplexing units 140a-1, . are referred to as wavelength multiplexing/demultiplexing units 140b-1, . . . , 140b-J.
- the optical transmission line 150 between the wavelength multiplexing/demultiplexing units 140a-j (j is an integer between 1 and J) and the wavelength multiplexing/demultiplexing units 140b-j is referred to as an optical transmission line 150-j.
- K (K is an integer equal to or greater than 1) dispersion compensators 160 are referred to as dispersion compensators 160-1, . . . , 160-K.
- Optical signals output by the subscriber units 120a-n and received by the subscriber units 120b-n have the wavelength ⁇ nu, and are output by the subscriber units 120b-n and received by the subscriber units 120a-n.
- a wavelength ⁇ nd is used for the signal.
- the opposing subscriber units 120a-n and 120b-n are connected via optical SWs 130a, 130b, wavelength multiplexing/demultiplexing units 140a-n, 140b-n, and optical transmission lines 150-n. .
- the subscriber unit 120 transmits and/or receives optical signals.
- the subscriber unit 120 transmits and receives optical signals of wavelengths notified from the management control unit 170 . Also, the subscriber unit 120 transmits and receives optical signals according to the signal parameter values notified from the management control unit 170 .
- Signal parameters determine characteristics of the signal. For example, the signal parameters represent baud rate, modulation scheme, output light intensity.
- the optical SW 130 includes multiple input ports 131 and multiple output ports 132 .
- the optical SW 130 outputs an optical signal input from the input port 131 to the output port 132 and outputs an optical signal input from the output port 132 to the input port 131 .
- the optical SW 130 can change the connection between the input port 131 and the output port 132 .
- Some input ports 131 of the optical SW 130a are connected to the subscriber unit 120a via optical transmission lines, and some output ports 132 of the optical SW 130a are connected to the wavelength multiplexing/demultiplexing unit 140a via optical transmission lines. be done.
- Some of the input ports 131 and some of the output ports 132 of the optical SW 130a are connected to the dispersion compensator 160 via optical transmission lines.
- An input port 131 of the optical SW 130b is connected to the subscriber unit 120b via an optical transmission line, and an output port 132 of the optical SW 130b is connected to the wavelength multiplexing/demultiplexing section 140b via an optical transmission line.
- the wavelength multiplexing/demultiplexing unit 140 has a plurality of first ports (not shown) and one second port (not shown). The multiple first ports correspond to different wavelengths. Each first port is connected to a different output port 132 of optical SW 130 . A second port is connected to the optical transmission line 150 .
- the wavelength multiplexing/demultiplexing unit 140 has a function of multiplexing optical signals of different wavelengths input from the optical SW 130 through a plurality of first ports, outputting the multiplexed optical signal from a second port, and having a function of outputting the multiplexed optical signal from the second port. and a function of demultiplexing the resulting optical signal into optical signals of different wavelengths and outputting the demultiplexed optical signals from separate first ports.
- the wavelength multiplexer/demultiplexer 140 is an AWG (Arrayed Waveguide Grating).
- the optical transmission line 150 transmits optical signals.
- the optical transmission line 150 is, for example, an optical fiber.
- the dispersion compensator 160 is an example of a quality compensator that compensates for the quality of the optical signal.
- the dispersion compensator 160 compensates for the dispersion of the optical signal output from the output port 132 of the optical SW 130 and inputs the dispersion-compensated optical signal to the input port 131 of the optical SW 130 .
- the amount of dispersion that can be compensated by each dispersion compensator 160 is different. When K ⁇ 3, the amount of dispersion that can be compensated by some of the plurality of dispersion compensators 160 may be the same. In this way, there are multiple types of dispersion amounts compensated by the K dispersion compensators 160 .
- dispersion compensating fibers having different lengths can be used.
- the dispersion of one optical signal may be compensated by a plurality of dispersion compensators 160 .
- the optical SW 130a outputs an optical signal from the output port 132 connected to the dispersion compensator 160-1.
- the dispersion compensator 160-1 compensates for the dispersion of the optical signal output from the optical SW 130a, and inputs the dispersion-compensated optical signal to the input port 131 of the optical SW 130a.
- the optical SW 130a outputs the optical signal input from the input port 131 connected to the dispersion compensator 160-1 from the output port 132 connected to the dispersion compensator 160-2.
- the dispersion compensator 160-2 compensates for the dispersion of the optical signal output from the optical SW 130a, and inputs the dispersion-compensated optical signal to the input port 131 of the optical SW 130a. In this case, the combined dispersion compensation effect of dispersion compensator 160-1 and dispersion compensator 160-2 can be expected. Therefore, the types of dispersion compensators 160 can be reduced, and the number of dispersion compensators 160 can be reduced.
- the management control device 170 is an example of a control device that controls the optical path in the optical SW 130 for optical signal quality compensation.
- the management control device 170 has a management control section 171 .
- the management control unit 171 has a storage unit 172 , an allocation unit 173 , a selection unit 174 , a port connection determination unit 175 and a notification unit 176 .
- the storage unit 172 stores the first parameter table.
- the first parameter table is data in which optical output subscriber units, optical input subscriber units, resource information, signal parameter information, allowable quality deterioration information, and dispersion compensator information are associated with each other.
- An optical output subscriber unit is a subscriber unit 120 that outputs an optical signal.
- An optical input subscriber unit is a subscriber unit 120 that receives optical signals.
- the resource information indicates resources used for transmission of optical signals from the optical output subscriber unit to the optical input subscriber unit.
- the resource information may include information regarding the transmission quality of the resource in addition to or instead of the information identifying the resource.
- the resources include communication wavelengths and optical transmission lines 150 .
- the resource may include optical SW 130 and wavelength multiplexing/demultiplexing section 140 .
- the information on transmission quality indicates the amount of signal quality degradation, or the amount used to calculate the amount of signal quality degradation, among resource specifications and characteristics.
- the information regarding the transmission quality is the length (transmission distance) of the optical transmission line 150, the chromatic dispersion of the optical fiber per unit distance, the accumulated chromatic dispersion, and the like.
- the signal parameter information indicates the value of the signal parameter used by the subscriber unit 120 or the setting content represented by the value.
- the permissible quality deterioration information represents the degree of permissible quality deterioration.
- the permissible quality degradation information indicates the permissible amount of variance.
- the quality compensator information indicates usable quality compensators. The usable quality compensator compensates for quality so that the degree of quality deterioration is acceptable according to the degree of quality deterioration of the optical signal that occurs when the optical signal is transmitted through the transmission line. Department.
- the quality compensator is the dispersion compensator 160 .
- the allocation unit 173 allocates resources to be used for optical paths between the subscriber units 120 and determines values of signal parameters. Any conventional technique can be used to allocate resources and determine values for signal parameters. Note that another device connected to the management control device 170 may have the allocation unit 173 .
- the selector 174 corresponds to a search condition indicated by the subscriber unit 120 that outputs the optical signal, the subscriber unit 120 that receives the optical signal, and the signal parameter information used for the optical signal between these subscriber units 120.
- the quality compensator information obtained from the first parameter table is read.
- the signal parameter information indicates the value of the signal parameter determined by the allocation unit 173 or the setting content represented by the value of the signal parameter.
- the search condition may further include used resource information.
- the used resource information includes at least part of the resources allocated by the allocation unit 173 and the information on the transmission quality of the resources.
- the selector 174 selects a quality compensator to be used from the quality compensators indicated by the read quality compensator information.
- the number of quality compensators to be selected may be one, or two or more. That is, the optical path between subscriber units 120 passes through one or more quality compensators.
- the port connection determination unit 175 determines the port connection relationship within the optical SW 130 for passing through the quality compensation unit selected by the selection unit 174 between the subscriber units 120 on the optical path between the subscriber units 120 .
- a port connection relationship indicates a connection relationship between the input port 131 and the output port 132 .
- the notification unit 176 notifies the subscriber unit 120 that outputs the optical signal and the subscriber unit 120 that receives the optical signal of the resources and signal parameter values determined by the allocation unit 173 . Also, the notification unit 176 notifies the optical SW 130 of the port connection relationship determined by the port connection determination unit 175 .
- FIG. 2 is a diagram showing an example of the first parameter table.
- the first parameter table contains numbers, optical output subscriber units, optical input subscriber units, optical transmission lines, wavelengths, fiber chromatic dispersion, transmission distances, accumulated chromatic dispersion, modulation schemes, It is information in which the baud rate, the allowable dispersion amount, and the dispersion compensator information are associated with each other.
- the optical transmission path, wavelength, chromatic dispersion of fiber, transmission distance and accumulated chromatic dispersion are resource information.
- the modulation scheme and baud rate are signal parameter information.
- the dispersion compensator information is an example of quality compensator information.
- the dispersion compensator information indicates the dispersion compensator 160 that can be used. In this way, the management control section 171 grasps the items from the optical output subscriber unit to the allowable dispersion amount, and selects the dispersion compensating section 160 based on the search condition.
- dispersion compensator 160 An example of selection of the dispersion compensator 160 is shown.
- a communication wavelength in the 1550 nm band has a chromatic dispersion of approximately 17 ps/nm/km. Therefore, the accumulated chromatic dispersion when the transmission distance is 100 km is 1700 ps/nm.
- different modulation schemes have different allowable dispersion values due to differences in spectrum spread.
- the permissible dispersion value decreases in inverse proportion to the square of the transmission speed.
- the permissible dispersion value for a signal whose modulation scheme is NRZ (Non Return to Zero) 40 Gbps is about 100 ps/nm (see Reference 1, for example).
- the dispersion compensator 160 having a dispersion compensation function that can reduce the accumulated chromatic dispersion amount from 1700 ps/nm to 100 ps/nm or less should be selected.
- the selected dispersion compensator 160 is set in the first parameter table.
- FIG. 3 is a sequence diagram showing the operation of the optical communication system 110 up to main signal conduction.
- FIG. 3 shows an example where subscriber device 120a-1 communicates with subscriber device 120b-1. Also, here, a case where an optical signal passes through one quality compensator will be described as an example.
- the subscriber device 120a-1 connects to the optical SW 130a (step S101).
- the subscriber unit 120b-1 connects to the optical SW 130b (step S102).
- the subscriber device 120a-1 transmits a connection request to the management control device 170 (step S103).
- Information indicating that the subscriber unit 120b-1 is the connection destination is set in the connection request.
- the allocation unit 173 of the management control device 170 determines the communication wavelength and optical transmission line 150 used for the optical signal between the subscriber device 120a-1 and the subscriber device 120b-1, and the signal parameter value (step S104).
- the allocation unit 173 divides the optical signal transmitted from the subscriber unit 120a-1 into the optical SW 130a, the wavelength multiplexing/demultiplexing unit 140a-1, the optical transmission line 150-1, the wavelength multiplexing/demultiplexing unit 140b-1, and the optical signal
- An optical path is determined to output to the subscriber unit 120b-1 via the SW 130b.
- the allocation unit 173 allocates the wavelength ⁇ 1u used in this optical path.
- the allocation unit 173 determines an optical path from the subscriber device 120b-1 to the subscriber device 120a-1 and allocates the wavelength ⁇ 1d.
- the allocation unit 173 determines values of signal parameters to be used for this optical path. Since the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1 will be explained in the second to fourth embodiments, detailed explanation will be omitted in this embodiment.
- the allocation unit 173 determines the baud rate, modulation method, output light intensity, and the like used for the optical path, and determines signal parameter values according to the determined baud rate, modulation method, output light intensity, and the like. For example, when the fiber lengths between the subscriber unit 120a-1 and the optical SW 130a, between the optical SW 130b and the subscriber unit 120b-1, and the optical transmission line 150-1 are different, the allocation unit 173 The value of the signal parameter of the optical signal used between the device 120a-1 and the subscriber device 120b-1 is changed.
- the allocation unit 173 communicates at a high baud rate when the fiber length of the optical transmission line 150 through which the optical signal passes is short, and conversely, when the fiber length of the optical transmission line 150 through which the optical signal passes is long determines the baud rate so that it communicates at a lower baud rate.
- the allocation unit 173 thus changes the baud rate according to the state of the optical transmission line 150 through which the optical signal passes. This allows the subscriber unit 120a-1 and the subscriber unit 120b-1 to receive the optical signal accurately.
- the notification unit 176 notifies the subscriber device 120a-1 and the subscriber device 120b-1 of the allocated communication wavelength and the determined value of the signal parameter (steps S105 and S106).
- the selection unit 174 selects the optical output subscriber unit indicating the subscriber unit 120a-1, the optical input subscriber unit indicating the subscriber unit 120b-1, the resource information of the resource allocated in step S104, and the Using the combination with the communication parameter information representing the determined communication parameter value as a search condition, the dispersion compensator information is read from the first parameter table stored in the storage unit 172 . If the resource used by the combination of the optical output subscriber unit and the optical input subscriber unit is fixed, the search condition may not include resource information. If the communication parameter value used is fixed depending on the combination of the optical output subscriber unit and the optical input subscriber unit, the search condition may not include the communication parameter information.
- the selector 174 selects the dispersion compensator 160-1 to be used for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1 from among the dispersion compensators 160 indicated by the dispersion compensator information (step S107).
- the selector 174 similarly selects the dispersion compensator 160 to be used for the optical signal from the subscriber unit 120b-1 to the subscriber unit 120a-1.
- the port connection determination unit 175 identifies the optical SW 130a and the optical SW 130b through which the optical path between the subscriber device 120a-1 and the subscriber device 120b-1 passes.
- the port connection determining unit 175 determines the port connection relationship between the optical SW 130a and the optical SW 130b (step S108).
- the port connection determination unit 175 connects the input port 131 and the output port so that the optical path between the subscriber device 120a-1 and the subscriber device 120b-1 passes through the dispersion compensator 160 selected by the selection unit 174. 132 to determine the port connection relationship.
- the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1 uses the dispersion compensator 160-1. Therefore, in the optical SW 130a to which the dispersion compensator 160-1 is connected, the port connection determination unit 175 determines that the optical signal input from the input port 131 connected to the subscriber unit 120a-1 is a wavelength multiplexer/demultiplexer.
- the input port 131 and the output port 132 are connected so as to pass through the dispersion compensator 160-1 before being output from the output port 132 connected to 140a-1. That is, the port connection determination unit 175 optically outputs an optical signal input from the input port 131 connected to the subscriber unit 120a-1 to the output port 132 connected to the dispersion compensator 160-1.
- the port connection determination unit 175 connects the optical signal input from the input port 131 to which the dispersion compensator 160-1 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexer/demultiplexer 140a-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is connected.
- the port connection determining unit 175 converts the optical signal input from the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 140b-1 to the subscriber unit 120b.
- the port connection relationship is determined so as to output to the input port 131 connected to -1.
- the notification unit 176 notifies the optical SW 130a of the port connection relationship of the optical SW 130a determined by the port connection determination unit 175 (step S109). Similarly, the notification unit 176 notifies the optical SW 130b of the port connection relationship of the optical SW 130b determined by the port connection determination unit 175 (step S110).
- the optical SW 130a connects the input port 131 and the output port 132 according to the port connection relation notified in step S109 (step S111). Similarly, the optical SW 130b connects the input port 131 and the output port 132 according to the port connection relationship notified in step S110 (step S112).
- the subscriber unit 120a-1 sets the communication wavelength and signal parameters notified in step S105 (step S113).
- the subscriber unit 120b-1 sets the communication wavelength and signal parameters notified in step S106 (step S114).
- the subscriber unit 120a-1 transmits a main signal with wavelength ⁇ 1u.
- the optical SW 130a and the optical SW 130b relay the main signal transmitted from the subscriber unit 120a-1 according to the established port connection relationship.
- the subscriber device 120b-1 receives the main signal transmitted from the subscriber device 120a-1 (step S115).
- the subscriber unit 120b-1 transmits a main signal of wavelength ⁇ 1d.
- the optical SW 130b and the optical SW 130a relay the main signal according to the set port connection relationship.
- the subscriber device 120a-1 receives the main signal transmitted from the subscriber device 120b-1 (step S116).
- the optical signal transmitted from the subscriber unit 120a-1 passes through the optical SW 130a, the dispersion compensator 160-1, and the optical SW 130a in order, and then passes through the wavelength multiplexer/demultiplexer 140a-1 to the optical transmission line 150. Enter -1.
- An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- the optical communication system 110 also performs the same processing as above between the subscriber device 120a-2 and the subscriber device 120b-2.
- the allocation unit 173 of the management control device 170 divides the optical signal transmitted from the subscriber unit 120a-2 into the optical SW 130a, the wavelength multiplexing/demultiplexing unit 140a-2, the optical transmission line 150-2, the wavelength multiplexing/demultiplexing unit 140b-. 2 and optical SW 130b to the subscriber unit 120b-2.
- the allocation unit 173 allocates the wavelength ⁇ 2u to the optical signal from the subscriber device 120a-2 to the subscriber device 120b-2 and determines the signal parameter value.
- the selector 174 determines to use the dispersion compensator 160-2 for the optical signal from the subscriber unit 120a-2 to the subscriber unit 120b-2.
- the optical signal transmitted from the subscriber unit 120a-2 passes through the optical SW 130a, the dispersion compensator 160-2, and the optical SW 130a in this order, and then passes through the wavelength multiplexer/demultiplexer 140a-2 to the optical transmission line 150. Enter -2.
- An optical signal input from the optical transmission line 150-2 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-2 is output to the subscriber unit 120b-2.
- optical signals between subscriber units 120 may pass through a plurality of dispersion compensators 160 .
- the combination of dispersion compensators 160 to be used is set in the dispersion compensator information of the first parameter table.
- the selector 174 selects the dispersion compensator 160-1 and the dispersion compensator 160-2 for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1. do.
- Selector 174 determines the order in which selected dispersion compensator 160-1 and dispersion compensator 160-2 are used according to a predetermined rule.
- the dispersion compensator information may include information on the order in which dispersion compensator 160-1 and dispersion compensator 160-2 are used.
- the selector 174 determines that the dispersion compensator 160-1 is the first.
- the port connection determination unit 175 transfers the optical signal input from the input port 131 connected to the subscriber unit 120a-1 to the output port 132 connected to the dispersion compensator 160-1.
- the port connection of the optical SW 130a is determined so as to output.
- port connection determining section 175 optically outputs an optical signal input from input port 131 to which dispersion compensating section 160-1 is connected to output port 132 to which dispersion compensating section 160-2 is connected.
- the port connection determination unit 175 connects the optical signal input from the input port 131 to which the dispersion compensator 160-2 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexer/demultiplexer 140a-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is set.
- the port connection determination unit 175 controls the connection relationship between the input port 131 and the output port 132 of the optical SW 130 so that the same quality compensation unit is not looped and used. This is because the optical SW 130 needs to be redirected to take the main signal out of the loop. A route change may cause a loss of main signal.
- the optical communication system 110 can select the dispersion compensator 160 through which the optical signal passes.
- the optical communication system 110 may connect the input port 131 and the output port 132 of the optical SW 130 a so as not to pass through the dispersion compensator 160 depending on the state of the optical transmission line 150 and signal parameter values.
- the sequence of this embodiment shown in FIG. 3 differs from the conventional sequence shown in FIG. This corresponds to adding a process (step S107) and performing the process of step S108 instead of the process of step S907.
- the optical communication system 110 may perform an operation in which the process of step S107 is added before the port connection relationship determination process (step S907) in the conventional sequence shown in FIGS.
- the port connection determining unit 175 determines the port connection relationship in the optical SW 130 connected to the selected dispersion compensating unit 160 in step S108. process.
- the optical communication system 110 of this embodiment selects the dispersion compensator 160 according to the cumulative amount of chromatic dispersion in the optical path through which the optical signal is transmitted and the allowable amount of dispersion, controls the optical path in the optical SW 130, and selects It passes through the dispersion compensator 160 that has been used.
- appropriate dispersion compensation can be performed to obtain a desired reception sensitivity.
- the optical signal from the subscriber unit 120b to the subscriber unit 120b also passes through the dispersion compensator 160.
- FIG. This embodiment will be described with a focus on differences from the first embodiment.
- FIG. 4 is a diagram showing the configuration of the optical communication system 210 of the second embodiment.
- the optical communication system 210 shown in FIG. 4 differs from the optical communication system 110 of the first embodiment shown in FIG. 1 in that a wavelength separation filter 280 is provided between the subscriber unit 120 and the optical SW 130, is connected to the dispersion compensator 160 .
- Descriptions of the subscriber units 120a-2 and 120b-2, the wavelength multiplexer/demultiplexer 140a-2, and the optical transmission line 150-2 are omitted.
- the wavelength separation filter 280 between the subscriber unit 120a-1 and the optical SW 130a is referred to as wavelength separation filter 280a
- the wavelength separation filter 280 between the subscriber device 120b-1 and optical SW 130b is referred to as wavelength separation filter 280b.
- the wavelength separation filters 280a and 280b separate the wavelength ⁇ 1u and the wavelength ⁇ 1d.
- the two dispersion compensators 160 connected to the optical SW 130b are referred to as dispersion compensators 160-3 and
- the format of the first parameter table stored by the management control device 170 is the same as in the first embodiment. However, in the first parameter table of the first embodiment shown in FIG. 2, the dispersion compensator 160-3 is set in the dispersion compensator information in the row of number 2. FIG.
- the optical communication system 210 performs the same processing as in the sequence diagram of the optical communication system 110 of the first embodiment shown in FIG. 3, except for the following.
- step S104 the allocation unit 173 sets the optical path from the subscriber device 120b-1 to the subscriber device 120a-1 in the opposite direction to the optical path from the subscriber device 120a-1 to the subscriber device 120b-1. is determined as the optical path of
- the selector 174 further selects the dispersion compensator 160 used for the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1.
- the selection unit 174 selects the optical output subscriber unit indicating the subscriber unit 120b-1, the optical input subscriber unit indicating the subscriber unit 120a-1, the resource information of the resources allocated in step S104, and step The combination with the communication parameter information representing the communication parameter value determined in S104 is used as a search condition to read the dispersion compensator information from the first parameter table.
- the selector 174 selects the dispersion compensator 160-3 to be used for the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1 from among the dispersion compensators 160 indicated by the read dispersion compensator information. .
- the port connection determination unit 175 determines the port connection relationship for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1, as in the first embodiment. Furthermore, the port connection determining unit 175 determines the port connection relationship for the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1 as follows.
- the port connection determining unit 175 determines that the selected dispersion compensating unit 160-3 is connected to the optical SW 130b.
- the port connection determining unit 175 outputs the optical signal input from the input port 131 connected to the subscriber unit 120b-1 from the output port 132 connected to the wavelength multiplexing/demultiplexing unit 140b-1.
- the input port 131 and the output port 132 are connected so as to pass through the dispersion compensator 160-3. That is, the port connection determination unit 175 optically outputs an optical signal input from the input port 131 connected to the subscriber unit 120b-1 to the output port 132 connected to the dispersion compensator 160-3. Determine the port connection relationship of the SW 130b.
- the port connection determination unit 175 connects the optical signal input from the input port 131 to which the dispersion compensator 160-3 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexer/demultiplexer 140b-1.
- the port connection relationship of the optical SW 130b is determined so as to output to the output port 132 that is connected.
- the port connection determining unit 175 selects the optical signal input from the output port 132 connected to the first port corresponding to the wavelength ⁇ 1d of the wavelength multiplexing/demultiplexing unit 140a-1 as the subscriber unit 120a.
- the port connection relationship is determined so as to output to the input port 131 connected to -1.
- step S115 the subscriber unit 120a-1 transmits the main signal of wavelength ⁇ 1u.
- the main signal transmitted from the subscriber unit 120a-1 passes through the wavelength separation filter 280a, the optical SW 130a, the dispersion compensator 160-1, and the optical SW 130a in order, and then optically transmitted through the wavelength multiplexer/demultiplexer 140a-1. Enter path 150-1.
- the main signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1 via the wavelength separation filter 280b.
- step S116 the subscriber unit 120b-1 transmits the main signal of wavelength ⁇ 1d.
- the main signal transmitted from the subscriber unit 120b-1 passes through the wavelength separation filter 280b, the optical SW 130b, the dispersion compensator 160-3, and the optical SW 130b in order, and then optically transmitted through the wavelength multiplexer/demultiplexer 140b-1. Enter path 150-1.
- the main signal input from the optical transmission line 150-1 to the optical SW 130a via the wavelength multiplexer/demultiplexer 140a-1 is output to the subscriber unit 120a-1 via the wavelength separation filter 280a.
- the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1 may pass through a plurality of dispersion compensators 160.
- the selector 174 selects the dispersion compensator 160-3 and the dispersion compensator 160-4 for the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1.
- the selector 174 determines to use the dispersion compensator 160-3 first, based on a predetermined rule or on the order information set in the dispersion compensator information.
- the port connection determination unit 175 transfers the optical signal input from the input port 131 connected to the subscriber unit 120b-1 to the output port 132 connected to the dispersion compensator 160-3.
- the port connection of the optical SW 130b is determined so as to output.
- port connection determining section 175 optically outputs an optical signal input from input port 131 to which dispersion compensating section 160-3 is connected to output port 132 to which dispersion compensating section 160-4 is connected.
- the port connection determination unit 175 connects the optical signal input from the input port 131 to which the dispersion compensator 160-4 is connected to the first port corresponding to the wavelength ⁇ 1d of the wavelength multiplexer/demultiplexer 140b-1.
- the port connection relationship of the optical SW 130b is determined so as to output to the output port 132 that is set.
- the optical communication system 210 of the second embodiment includes optical signals output from the subscriber units 120a-n and received by the subscriber units 120b-n and optical signals output from the subscriber units 120b-n and received by the subscriber units 120a-n.
- -n can be dispersion-compensated using different dispersion compensators 160, respectively.
- the optical SW closest to the subscriber unit performing optical transmission performs dispersion compensation.
- dispersion compensation of an optical signal output from a subscriber unit is performed by a dispersion compensator connected to an optical SW different from the optical SW connected to the subscriber unit. good too.
- This embodiment will be described with a focus on differences from the first and second embodiments.
- FIG. 5 is a diagram showing the configuration of an optical communication system 310 according to the third embodiment.
- the optical communication system 310 shown in FIG. 5 differs from the optical communication system 110 of the first embodiment shown in FIG. be.
- the optical SW 130 is connected to the wavelength multiplexing/demultiplexing section 140 via the wavelength separation filter 380 by one output port 132 .
- the wavelength separation filter 380 between the optical SW 130a and the wavelength multiplexing/demultiplexing section 140a-1 is referred to as the wavelength separation filter 380a
- the wavelength separation filter 380 between the optical SW 130b and the wavelength multiplexing/demultiplexing section 140b-1 is referred to as the wavelength separation filter 380b. and described.
- the wavelength separation filters 380a and 380b separate the wavelength ⁇ 1u and the wavelength ⁇ 1d.
- the wavelength separation filter 380a outputs the optical signal of the wavelength ⁇ 1u input from the output port 132 of the optical SW 130a to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing section 140a-1, and the wavelength multiplexing/demultiplexing section 140a- 1 is output to the output port 132 of the optical SW 130a.
- the wavelength separation filter 380b outputs the optical signal of the wavelength ⁇ 1d input from the output port 132 of the optical SW 130b to the first port corresponding to the wavelength ⁇ 1d of the wavelength multiplexing/demultiplexing section 140b-1, and the wavelength multiplexing/demultiplexing section 140b- 1 is output to the output port 132 of the optical SW 130b.
- the format of the first parameter table stored by the management control device 170 is the same as in the first embodiment. However, in the first parameter table of the first embodiment shown in FIG. 2, the dispersion compensator 160-1 is set in the dispersion compensator information in the row of number 2. FIG.
- the optical communication system 310 performs the same processing as the sequence diagram of the optical communication system 110 of the first embodiment shown in FIG. 3 except for the following.
- step S104 the allocation unit 173 sets the optical path from the subscriber device 120b-1 to the subscriber device 120a-1 in the opposite direction to the optical path from the subscriber device 120a-1 to the subscriber device 120b-1. is determined as the optical path of
- step S107 the selector 174 selects the dispersion compensator 160-1 to be used for the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1 by the same processing as in the second embodiment.
- the port connection determination unit 175 determines the port connection relationship for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1, as in the first embodiment. Furthermore, for the optical signal from the subscriber unit 120b-1 to the subscriber unit 120a-1, the port connection relationship is determined as follows.
- the port connection determining unit 175 determines that the selected dispersion compensating unit 160-1 is connected to the optical SW 130a. For the optical SW 130b, the port connection determination unit 175 transfers the optical signal input from the input port 131 connected to the subscriber unit 120b-1 to the output port 132 connected to the wavelength multiplexing/demultiplexing unit 140b-1. Determine the port connection relationship to output. Also, the port connection determining unit 175, in the optical SW 130a, transmits the optical signal input from the output port 132 connected to the wavelength multiplexing/demultiplexing unit 140a-1 to the input port 131 connected to the dispersion compensating unit 160-1. Determine the port connection relationship to output. Further, the port connection determination unit 175 optically outputs the optical signal input from the output port 132 connected to the dispersion compensator 160-1 to the input port 131 connected to the subscriber unit 120a-1. Determine the port connection relationship of the SW 130a.
- step S115 the subscriber unit 120a-1 transmits the main signal of wavelength ⁇ 1u.
- the main signal transmitted from the subscriber unit 120a-1 passes through the optical SW 130a, the dispersion compensator 160-1, and the optical SW 130a in this order, and then passes through the wavelength separation filter 380a and the wavelength multiplexer/demultiplexer 140a-1 for optical transmission.
- Enter path 150-1 An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 and the wavelength separation filter 380a is output to the subscriber unit 120b-1.
- step S116 the subscriber unit 120b-1 transmits the main signal of wavelength ⁇ 1d.
- a main signal transmitted from the subscriber unit 120b-1 is input to the optical transmission line 150-1 via the optical SW 130b, the wavelength separation filter 380b and the wavelength multiplexer/demultiplexer 140b-1.
- the main signal input to the optical SW 130a from the optical transmission line 150-1 via the wavelength multiplexer/demultiplexer 140a-1 and the wavelength separation filter 380a is transmitted through the dispersion compensator 160-1 and the optical SW 130a to the subscriber unit 120a-. output to 1.
- optical signals between subscriber units 120 may pass through a plurality of dispersion compensators 160 .
- the selector 174 selects the dispersion compensator 160-1 and the dispersion compensator 160-2 for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1.
- the port connection determination unit 175 determines that the optical signal transmitted from the subscriber unit 120a-1 is the optical SW 130a, the dispersion compensation unit 160-1, the optical SW 130a, The port connection relationship of the optical SW 130a is determined so that the dispersion compensator 160-2 and the optical SW 130a are passed in order.
- the selector 174 selects the dispersion compensator 160-1 and the dispersion compensator 160-2 for the optical signal from the subscriber device 120b-1 to the subscriber device 120a-1. .
- the selector 174 determines to use the dispersion compensator 160-1 first, based on a predetermined rule or on the order information set in the dispersion compensator information.
- the port connection determining unit 175 causes the optical SW 130a to transfer the optical signal input from the output port 132 connected to the wavelength multiplexing/demultiplexing unit 140a-1 to the dispersion compensating unit 160-1.
- the port connection relationship is determined so as to output to the input port 131 where the Further, the port connection determination unit 175 connects the optical SW 130a so that the optical signal input from the output port 132 to which the dispersion compensator 160-1 is connected is output to the input port 131 to which the dispersion compensator 160-2 is connected. Determine the port connection relationship of Furthermore, the port connection determination unit 175 outputs the optical signal input from the output port 132 connected to the dispersion compensator 160-2 to the input port 131 connected to the subscriber unit 120a-1. Determine the port connection relationship of the optical SW 130a.
- optical signals output from subscriber units 120a-n and received by subscriber units 120b-n and optical signals output from subscriber units 120b-n and received by subscriber units 120a-n signals can be dispersion-compensated using the same dispersion compensator 160 .
- the number of ports of the optical SW 130 can be reduced compared to the second embodiment.
- FIG. 6 is a diagram showing the configuration of an optical communication system 410 according to the fourth embodiment.
- the optical communication system 410 shown in FIG. 6 differs from the optical communication system 110 of the first embodiment shown in FIG. be.
- the optical SW 130 a is connected to the dispersion compensator 160 via the wavelength multiplexer/demultiplexer 440 .
- a device similar to the wavelength multiplexing/demultiplexing unit 140 can be used as the wavelength multiplexing/demultiplexing unit 440 .
- the wavelength multiplexer/demultiplexer 440 connected to the dispersion compensator 160-k and the plurality of input ports 131 of the optical SW 130a is referred to as a wavelength multiplexer/demultiplexer 440a
- the wavelength multiplexing/demultiplexing unit 440 has a plurality of first ports (not shown) and one second port (not shown). The multiple first ports correspond to different wavelengths.
- the wavelength multiplexing/demultiplexing unit 440 has a function of multiplexing optical signals of different wavelengths input from each of a plurality of first ports and outputting the multiplexed optical signal from a second port, and a function of outputting the multiplexed optical signal from the second port It has either or both functions of demultiplexing a signal into optical signals of different wavelengths and outputting the demultiplexed optical signals from separate first ports.
- the first ports of the wavelength multiplexing/demultiplexing units 440a-k-1 are respectively connected to different output ports 132 of the optical SW 130a.
- a second port of wavelength multiplexer/demultiplexer 440a-k-1 is connected to an optical transmission line with dispersion compensator 160-k.
- the first ports of wavelength multiplexer/demultiplexer 440a-k-2 are connected to different input ports 131 of optical SW 130a.
- a second port of wavelength multiplexer/demultiplexer 440a-k-2 is connected to an optical transmission line with dispersion compensator 160-k.
- the optical communication system 410 performs the same processing as in the sequence diagram of the optical communication system 110 of the first embodiment shown in FIG. 3, except for the following.
- the port connection determination unit 175 of the management control device 170 determines that the dispersion compensator 160-1 selected in step S107 is the wavelength multiplexer/demultiplexer 440a-1-1 and the wavelength multiplexer/demultiplexer 440a-. 1-2 to the optical SW 130a.
- the port connection determining unit 175 connects the optical signal input from the input port 131 connected to the subscriber unit 120a-1 to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-1-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is connected.
- the port connection determining unit 175 selects the optical signal input from the input port 131 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-1-2 as the wavelength multiplexing/demultiplexing unit 140a-
- the port connection relation of the optical SW 130a is determined so as to output to the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of one.
- the optical signal of wavelength ⁇ 1u transmitted from the subscriber unit 120a-1 is divided into the optical SW 130a, the wavelength multiplexing/demultiplexing unit 440a-1-1, the dispersion compensation unit 160-1, and the wavelength multiplexing/demultiplexing unit 440a-1-. 2. It passes through the optical SW 130a in order and is input to the optical transmission line 150-1 via the wavelength multiplexer/demultiplexer 140a-1. An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- the allocation unit 173 of the management control unit 170 allocates the wavelength ⁇ 2u to the optical signal from the subscriber unit 120a-2 to the subscriber unit 120b-2, and the selection unit 174 selects this optical signal.
- the port connection determining unit 175 connects the optical signal input from the input port 131 connected to the subscriber unit 120a-2 to the first port corresponding to the wavelength ⁇ 2u of the wavelength multiplexing/demultiplexing unit 440a-1-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 connected to .
- the port connection determining unit 175 selects the optical signal input from the input port 131 connected to the first port corresponding to the wavelength ⁇ 2u of the wavelength multiplexing/demultiplexing unit 440a-1-2 to the wavelength multiplexing/demultiplexing unit 140a-1-2.
- the port connection relation of the optical SW 130a is determined so that the light is output to the output port 132 connected to the first port corresponding to the wavelength ⁇ 2u of No. 2.
- the optical signal of wavelength ⁇ 2u transmitted from the subscriber unit 120a-2 is divided into the optical SW 130a, the wavelength multiplexing/demultiplexing unit 440a-1-1, the dispersion compensation unit 160-1, and the wavelength multiplexing/demultiplexing unit 440a-1-.
- optical signal input from the optical transmission line 150-2 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-2 is output to the subscriber unit 120b-2.
- the wavelength multiplexing/demultiplexing unit 440a-1-1 multiplexes the optical signal of the wavelength ⁇ 1u and the optical signal of the wavelength ⁇ 2u input from the optical SW 130a, outputs them to the dispersion compensating unit 160-1, and outputs them to the wavelength multiplexing/demultiplexing unit 440a-.
- 1-2 demultiplexes the optical signal of wavelength ⁇ 1u and the optical signal of wavelength ⁇ 2u from the optical signal whose dispersion is compensated by the dispersion compensator 160-1, and outputs the optical signal to the optical SW 130a.
- the wavelength multiplexing/demultiplexing unit 440 multiplexes optical signals of a plurality of wavelengths and inputs the multiplexed optical signal to the dispersion compensating unit 160, so that the same dispersion compensating unit 160 can be used to Dispersion compensation for optical signals can be performed all at once. Therefore, the number of dispersion compensators 160 can be reduced.
- signals between subscriber units 120 may pass through a plurality of dispersion compensators 160 .
- the selector 174 selects the dispersion compensator 160-1 and the dispersion compensator 160-2 for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1, It decides to use compensator 160-1 first.
- the port connection determining unit 175 associates the optical signal input from the input port 131 connected to the subscriber unit 120a-1 with the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-1-1.
- the port connection relationship of the optical SW 130a is determined so that the light is output to the output port 132 connected to the first port.
- the port connection determining unit 175 selects the optical signal input from the input port 131 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-1-2 as the wavelength multiplexing/demultiplexing unit 440a-
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of 2-1.
- the port connection determination unit 175 selects the optical signal input from the input port 131 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-2-2 as the wavelength multiplexing/demultiplexing unit 140a.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of -1.
- the combined dispersion compensation effect of dispersion compensators 160-1 and 160-2 can be expected. Therefore, when passing through a plurality of dispersion compensators 160, the types of dispersion compensators 160 can be reduced, and the number of dispersion compensators 160 can be further reduced.
- the dispersion compensator is used as the quality compensator.
- an optical amplifier is used as the quality compensator. This embodiment will be described with a focus on differences from the first embodiment.
- FIG. 7 is a diagram showing the configuration of an optical communication system 510 according to the fifth embodiment.
- the optical communication system 510 shown in FIG. 7 differs from the optical communication system 110 shown in FIG.
- the optical amplifier 560 amplifies the optical signal output from the output port 132 of the optical SW 130 and inputs the amplified optical signal to the input port 131 of the optical SW 130 .
- Each optical amplifier 560 has a different gain. If K ⁇ 3, some of the plurality of optical amplifiers 560 may have the same gain. Thus, the K optical amplifiers 560 have a plurality of gains.
- one optical signal may be amplified by a plurality of optical amplifiers 560 .
- the optical SW 130a outputs an optical signal from the output port 132 connected to the optical amplifier 560-1.
- the optical amplifier 560-1 amplifies the optical signal output from the optical SW 130a and inputs the amplified optical signal to the input port 131 of the optical SW 130a.
- the optical SW 130a outputs the optical signal input from the input port 131 connected to the optical amplifier 560-1 from the output port 132 connected to the optical amplifier 560-2.
- the optical amplifier 560-2 amplifies the optical signal output from the optical SW 130a and inputs the amplified optical signal to the input port 131 of the optical SW 130a.
- the combined amplification of the optical amplifiers 560-1 and 560-2 can be expected. Therefore, the types of optical amplifiers 560 can be reduced, and the number of optical amplifiers 560 can be reduced.
- FIG. 8 is a diagram showing an example of the second parameter table of this embodiment.
- the storage unit 172 of the management control device 170 stores the second parameter table shown in FIG. 8 instead of the first parameter table shown in FIG.
- the second parameter table includes numbers, optical output subscriber units, optical input subscriber units, optical transmission lines, wavelengths, transmission losses, optical device losses, cumulative losses, modulation schemes, baud rates, and , the minimum reception sensitivity, the transmission light intensity, the maximum permissible loss, and the optical amplifier information.
- the optical transmission line, wavelength, transmission loss, optical device loss and cumulative loss are resource information.
- the transmission loss represents the transmission loss of the optical transmission line 150
- the optical device loss represents the loss of the optical SW 130 and wavelength multiplexing/demultiplexing section 140.
- the optical amplifier information indicates usable optical amplifiers 560 .
- the management control unit 171 grasps the items from the optical output subscriber unit to the maximum permissible loss, and sets the optical output subscriber unit, the optical input subscriber unit, the used resource information, and the signal parameter information.
- the optical amplifier 560 is selected based on the search conditions indicated by and. The number of selected optical amplifiers 560 may be one, or two or more.
- Optical fibers for transmission generally used at present have a transmission loss of about 0.25 dB/km for communication wavelengths in the 1550 nm band. Therefore, the transmission loss is 25 dB when the transmission distance is 100 km.
- the optical loss of the AWG used as the wavelength multiplexing/demultiplexing unit 140 is 3 dB, and the loss of the optical SW 130 is 5 dB (for example, see Reference 2).
- the optical device loss when passing through two AWGs and two optical SWs 130 is 16 dB. Therefore, the cumulative loss, which is the sum of transmission loss and optical device loss, is 41 dB.
- reception sensitivity for obtaining a desired bit error rate differs depending on the modulation method, baud rate, and configuration of the receiver. Different transmission light intensities require different maximum losses to obtain the desired reception sensitivity. For example, assume that the minimum reception sensitivity at which a bit error rate is 10 ⁇ 3 is ⁇ 16 dBm when a signal with a modulation scheme of NRZ 10 Gbps is received by IMDD (Intensity-modulation and Direct-detection). The maximum permissible loss for a signal with a transmitted light intensity of +4 dBm is approximately 20 dB. In this case, an optical amplifier 560 that can reduce the accumulated loss from 41 dB to 20 dB or less, that is, has a gain of 21 dB or more, should be selected. The selected optical amplifier 560 is set in the second parameter table.
- FIG. 9 is a sequence diagram showing the operation of the optical communication system 510 up to main signal conduction.
- the subscriber device 120a-1 communicates with the subscriber device 120b-1.
- the same reference numerals are assigned to the same processes as in the optical communication system 110 according to the first embodiment shown in FIG.
- the optical communication system 510 performs the same processing as steps S101 to S106 in FIG.
- the selection unit 174 of the management control device 170 stores the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1 in the storage unit 172 using the same search conditions as in step S107 of the first embodiment.
- Optical amplifier information is read from the stored second parameter table.
- the selector 174 selects the optical amplifier 560-1 to be used for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1 from among the optical amplifiers 560 indicated by the optical amplifier information (step S501). Further, the selector 174 selects the optical amplifier 560 to be used for optical signals from the subscriber unit 120b-1 to the subscriber unit 120a-1.
- the port connection determination unit 175 connects the input port 131 and the output port so that the optical path between the subscriber device 120a-1 and the subscriber device 120b-1 passes through the optical amplifier 560 selected by the selection unit 174. 132 is determined (step S502).
- the port connection determination unit 175 outputs the optical signal input from the input port 131 connected to the subscriber unit 120a-1 to the output port 132 connected to the optical amplification unit 560-1.
- the port connection relationship of the optical SW 130a is determined as follows. Further, the port connection determining unit 175 connects the optical signal input from the input port 131 to which the optical amplifying unit 560-1 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 140a-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is connected.
- the port connection determining unit 175 converts the optical signal input from the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 140b-1 to the subscriber unit 120b.
- the port connection relationship is determined so as to output to the input port 131 connected to -1.
- the optical communication system 510 performs the processing of steps S109 to S114 in FIG.
- the subscriber unit 120a-1 transmits a main signal with wavelength ⁇ 1u.
- the optical SW 130a and the optical SW 130b relay the main signal transmitted from the subscriber unit 120a-1 according to the established port connection relationship.
- the subscriber device 120b-1 receives the main signal transmitted from the subscriber device 120a-1 (step S503).
- subscriber unit 120b-1 transmits a main signal of wavelength ⁇ 1d.
- the optical SW 130b and the optical SW 130a relay the main signal according to the set port connection relationship.
- the subscriber device 120a-1 receives the main signal transmitted from the subscriber device 120b-1 (step S504).
- the optical signal transmitted from the subscriber unit 120a-1 passes through the optical SW 130a, the optical amplifier 560-1, and the optical SW 130a in order, and then passes through the wavelength multiplexer/demultiplexer 140a-1 to the optical transmission line 150. Enter -1.
- An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- the optical communication system 110 also performs the same processing as above between the subscriber device 120a-2 and the subscriber device 120b-2.
- the optical signal transmitted from the subscriber unit 120a-2 passes through the optical SW 130a, the optical amplifier 560-2, and the optical SW 130a in order, and then passes through the wavelength multiplexer/demultiplexer 140a-2 to the optical transmission line 150. Enter -2.
- An optical signal input from the optical transmission line 150-2 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-2 is output to the subscriber unit 120b-2.
- optical signals between subscriber units 120 may pass through a plurality of optical amplifiers 560 .
- the combination of optical amplifiers 560 to be used is set in the dispersion compensator information of the second parameter table.
- the selector 174 selects the optical amplifier 560-1 and the optical amplifier 560-2 for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1. do.
- Selection section 174 determines the order in which selected optical amplification section 560-1 and optical amplification section 560-2 are used according to a predetermined rule.
- the dispersion compensator information may include information on the order in which optical amplifiers 560-1 and 560-2 are used.
- the selector 174 determines that the optical amplifier 560-1 is first.
- the port connection determination unit 175 transfers the optical signal input from the input port 131 connected to the subscriber unit 120a-1 to the output port 132 connected to the optical amplifier unit 560-1.
- the port connection of the optical SW 130a is determined so as to output.
- port connection determining section 175 optically outputs an optical signal input from input port 131 to which optical amplifying section 560-1 is connected to output port 132 to which optical amplifying section 560-2 is connected.
- the port connection determining unit 175 connects the optical signal input from the input port 131 to which the optical amplifier 560-2 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 140a-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is set.
- the optical communication system 510 can select the optical amplifier 560 through which the optical signal passes.
- the optical communication system 510 may connect the input port 131 and the output port 132 of the optical SW 130 a so as not to pass through the optical amplifier 560 depending on the state of the optical transmission line 150 and signal parameter values.
- step S501 the selector 174 selects the optical amplifier 560 before the management controller 170 notifies the optical SW 130 of the port connection relationship.
- step S502 the process of step S907.
- the process of step S501 is executed with reference to the second parameter table shown in FIG.
- the optical communication system 510 may perform an operation in which the process of step S501 is added before the port connection relationship determination process (step S907) in the conventional sequence shown in FIGS.
- step S908 the port connection determination unit 175 determines the port connection relationship so that the optical SW 130 connected to the selected optical amplifier 560 passes through the optical amplifier 560 of step S502. process.
- the optical communication system 510 of this embodiment selects the optical amplifier 560 according to the cumulative loss in the optical path through which the optical signal is transmitted and the allowable loss, controls the optical path in the optical SW 130, and selects the optical amplification unit 560. 560. Accordingly, even in an optical communication system in which a plurality of types of optical transmission path states and signal parameter values can be selected, appropriate optical amplification can be performed to obtain desired reception sensitivity.
- FIG. 10 is a diagram showing the configuration of an optical communication system 610 according to the sixth embodiment.
- the optical communication system 610 shown in FIG. 10 differs from the optical communication system 410 of the fourth embodiment shown in FIG. The difference is that the storage unit 172 stores the second parameter table of the fifth embodiment shown in FIG.
- the optical SW 130 a of this embodiment is connected to the optical amplification section 560 via the wavelength multiplexing/demultiplexing section 440 .
- the optical amplifier 560 connected to the wavelength multiplexer/demultiplexer 440a-k-1 and the wavelength multiplexer/demultiplexer 440a-k-2 is referred to as an optical amplifier 560-k.
- the optical communication system 610 performs the same processing as the sequence diagram of the optical communication system 510 of the fifth embodiment shown in FIG. 9 except for the following.
- the port connection determining unit 175 of the management control device 170 determines that the optical amplifying unit 560-1 selected in step S501 is the wavelength multiplexing/demultiplexing unit 440a-1-1 and the wavelength multiplexing/demultiplexing unit 440a- 1-2 to the optical SW 130a.
- the port connection determining unit 175 connects the optical signal input from the input port 131 connected to the subscriber unit 120a-1 to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-1-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is connected.
- the port connection determining unit 175 selects the optical signal input from the input port 131 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 440a-1-2 as the wavelength multiplexing/demultiplexing unit 140a-
- the port connection relation of the optical SW 130a is determined so as to output to the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of one.
- the optical signal of wavelength ⁇ 1u transmitted from the subscriber unit 120a-1 is transferred to the optical SW 130a, the wavelength multiplexing/demultiplexing unit 440a-1-1, the optical amplifier 560-1, the wavelength multiplexing/demultiplexing unit 440a-1- 2. It passes through the optical SW 130a in order and is input to the optical transmission line 150-1 via the wavelength multiplexer/demultiplexer 140a-1. An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- the allocation unit 173 of the management control unit 170 allocates the wavelength ⁇ 2u to the optical signal from the subscriber unit 120a-2 to the subscriber unit 120b-2, and the selection unit 174 selects this optical signal.
- the port connection determining unit 175 connects the optical signal input from the input port 131 connected to the subscriber unit 120a-2 to the first port corresponding to the wavelength ⁇ 2u of the wavelength multiplexing/demultiplexing unit 440a-1-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 connected to .
- the port connection determining unit 175 selects the optical signal input from the input port 131 connected to the first port corresponding to the wavelength ⁇ 2u of the wavelength multiplexing/demultiplexing unit 440a-1-2 to the wavelength multiplexing/demultiplexing unit 140a-1-2.
- the port connection relation of the optical SW 130a is determined so that the light is output to the output port 132 connected to the first port corresponding to the wavelength ⁇ 2u of No. 2.
- the optical signal of wavelength ⁇ 2u transmitted from the subscriber unit 120a-2 is transferred to the optical SW 130a, the wavelength multiplexing/demultiplexing unit 440a-1-1, the optical amplifier 560-1, the wavelength multiplexing/demultiplexing unit 440a-1- 2, sequentially via the optical SW 130a and input to the optical transmission line 150-2 via the wavelength multiplexer/demultiplexer 140a-2.
- An optical signal input from the optical transmission line 150-2 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-2 is output to the subscriber unit 120b-2.
- the wavelength multiplexing/demultiplexing unit 440a-1-1 multiplexes the optical signal of the wavelength ⁇ 1u and the optical signal of the wavelength ⁇ 2u input from the optical SW 130a, outputs them to the optical amplification unit 560-1, and outputs them to the wavelength multiplexing/demultiplexing unit 440a-.
- 1-2 demultiplexes an optical signal of wavelength ⁇ 1u and an optical signal of wavelength ⁇ 2u from the optical signal whose dispersion is compensated by optical amplifier 560-1, and outputs the optical signal to optical SW 130a.
- the wavelength multiplexing/demultiplexing unit 440 multiplexes optical signals of a plurality of wavelengths and inputs the multiplexed optical signal to the optical amplifier unit 560 .
- Optical signals can be amplified all at once. Therefore, the number of optical amplifiers 560 can be reduced.
- signals between subscriber units 120 may pass through a plurality of optical amplifiers 560 .
- the selector 174 selects the optical amplifier 560-1 and the optical amplifier 560-2 for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1, It decides to use amplifier 560-1 first.
- the port connection determination unit 175 performs dispersion compensating unit 160-1 and dispersion compensating unit 160-1 for the optical signal from subscriber unit 120a-1 to subscriber unit 120b-1 in the fourth embodiment.
- the port connection relation of the optical SW 130a is determined.
- the optical communication system of this embodiment has a plurality of dispersion compensators with different amounts of dispersion and a plurality of optical amplifiers with different gains. This embodiment will be described with a focus on differences from the above-described embodiment.
- FIG. 11 is a diagram showing the configuration of an optical communication system 710 according to the seventh embodiment.
- the optical communication system 710 shown in FIG. 11 differs from the optical communication system 110 shown in FIG. 1 in that it further includes the optical amplifier 560 of the fifth embodiment shown in FIG.
- Some of the input ports 131 and some of the output ports 132 of the optical SW 130a are connected to optical amplifiers 560-1 to 560-K via optical transmission lines.
- the storage unit 172 of the management control device 170 stores the first parameter table shown in FIG. 2 and the second parameter table shown in FIG.
- the storage unit 172 may store a parameter table obtained by integrating the first parameter table shown in FIG. 2 and the second parameter table shown in FIG.
- FIG. 12 is a sequence diagram showing the operation of the optical communication system 710 up to main signal conduction.
- the subscriber device 120a-1 communicates with the subscriber device 120b-1.
- the same reference numerals are given to the same processes as in the optical communication system 110 according to the first embodiment shown in FIG.
- the optical communication system 710 performs the same processing as steps S101 to S106 in FIG.
- the selector 174 of the management controller 170 determines the dispersion compensator 160-1 to be used for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1, as in step S107 of the first embodiment. Further, the selector 174 selects the optical amplifier 560-1 to be used for the optical signal from the subscriber unit 120a-1 to the subscriber unit 120b-1 as in step S501 of the fifth embodiment shown in FIG. (Step S701).
- the port connection determining unit 175 passes through the dispersion compensating unit 160-1 and the optical amplifying unit 560-1 selected by the selecting unit 174 on the optical path between the subscriber unit 120a-1 and the subscriber unit 120b-1.
- a port connection relation connecting the input port 131 and the output port 132 is determined as follows (step S702).
- the port connection determination unit 175 determines the port connection relationship of the optical SW 130a as follows.
- the port connection determination unit 175 establishes a port connection relationship so that an optical signal input from the input port 131 connected to the subscriber unit 120a-1 is output to the output port 132 connected to the dispersion compensator 160-1. decide.
- port connection determining section 175 outputs the optical signal input from input port 131 to which dispersion compensating section 160-1 is connected to output port 132 to which optical amplifying section 560-1 is connected. Determine connectivity.
- the port connection determining unit 175 connects the optical signal input from the input port 131 to which the optical amplifier 560-1 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexing/demultiplexing unit 140a-1.
- the port connection relationship is determined so as to output to the output port 132 that is set.
- the optical communication system 710 performs the processing of steps S109 to S114 in FIG.
- the subscriber unit 120a-1 transmits a main signal with wavelength ⁇ 1u.
- the optical SW 130a and the optical SW 130b relay the main signal transmitted from the subscriber unit 120a-1 according to the established port connection relationship.
- the subscriber device 120b-1 receives the main signal transmitted from the subscriber device 120a-1 (step S703).
- subscriber unit 120b-1 transmits a main signal of wavelength ⁇ 1d.
- the optical SW 130b and the optical SW 130a relay the main signal according to the set port connection relationship.
- the subscriber device 120a-1 receives the main signal transmitted from the subscriber device 120b-1 (step S704).
- step S703 the optical signal transmitted from the subscriber unit 120a-1 passes through the optical SW 130a, the dispersion compensator 160-1, the optical SW 130a, the optical amplifier 560-1, and the optical SW 130a in order, and then wavelength multiplexes/demultiplexes. It is input to the optical transmission line 150-1 via the section 140a-1. An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- Signals between subscriber units 120 may pass through a plurality of dispersion compensators 160 and may pass through a plurality of optical amplifiers 560 .
- the port connection determination unit 175 establishes the port connection relationship of the optical SW 130 through the one or more dispersion compensators 160 selected by the selection unit 174 and the one or more optical amplifiers 560 as in the above-described embodiment. decide.
- the optical communication system 810 can select the dispersion compensator 160 and the optical amplifier 560 through which the optical signal passes.
- the optical communication system 810 may connect the input port and the output port of the optical SW 130a so as not to pass through one or both of the dispersion compensator 160 and the optical amplifier 560, depending on the state of the optical transmission path and signal parameter values.
- the optical communication system 810 includes wavelength multiplexing/demultiplexing units 440a-k-1 and wavelength multiplexing/demultiplexing units 440a-k between the optical SW 130a and the dispersion compensator 160-k. -2 may be inserted, and a wavelength multiplexing/demultiplexing unit 440a-k-1 and a wavelength multiplexing/demultiplexing unit 440a-k-2 may be inserted between the optical SW 130a and the optical amplifier 560-k.
- step S701 for selecting the unit 560 and performing the process of step S702 instead of the process of step S907.
- the optical communication system 710 may perform operations in which the process of step S701 is added before the port connection relationship determination process (step S907) in the conventional sequences shown in FIGS.
- the port connection determination unit 175 performs the process of step S702 instead of the process of step S908.
- the optical communication system of this embodiment has a plurality of quality compensators each including a dispersion compensator and an optical amplifier. This embodiment will be described with a focus on differences from the above-described embodiment.
- FIG. 13 is a diagram showing the configuration of an optical communication system 810 according to the eighth embodiment.
- the optical communication system 810 shown in FIG. 13 differs from the optical communication system 110 shown in FIG. 1 in that it includes a quality compensator 860 instead of the dispersion compensator 160 .
- the K quality compensators 860 are referred to as quality compensators 860-1, . . . , 860-K.
- the quality compensator 860-k has a dispersion compensator 160-k and an optical amplifier 560-k.
- Some of the input ports 131 and some of the output ports 132 of the optical SW 130a are connected to the quality compensator 860 via optical transmission lines.
- the storage unit 172 of the management control device 170 stores the first parameter shown in FIG. A parameter table that integrates the table and the second parameter table shown in FIG. 8 is stored.
- This parameter table includes quality compensator information instead of dispersion compensator information and optical amplifier information.
- the quality compensator information indicates available quality compensators 860 .
- the selection unit 174 reads the quality compensator information that matches the search condition from the parameter table, and selects the quality compensator 860 to be used from the quality compensator information.
- the number of quality compensators 860 to be selected may be one, or two or more.
- step S701 the selector 174 of the management controller 170 selects the quality compensator 860-1 to be used for the optical signal from the subscriber device 120a-1 to the subscriber device 120b-1.
- step S702 the port connection determination unit 175 inputs so that the optical path between the subscriber device 120a-1 and the subscriber device 120b-1 passes through the quality compensation unit 860-1 selected by the selection unit 174. A port connection relation connecting the port 131 and the output port 132 is determined.
- port connection determining section 175 outputs an optical signal input from input port 131 connected to subscriber unit 120a-1 to output port 132 to which quality compensating section 860-1 is connected.
- the port connection relationship of the optical SW 130a is determined as follows. Further, port connection determining section 175 connects the optical signal input from input port 131 to which quality compensating section 860-1 is connected to the first port corresponding to wavelength ⁇ 1u of wavelength multiplexing/demultiplexing section 140a-1.
- the port connection relationship of the optical SW 130a is determined so as to output to the output port 132 that is connected.
- the main signal of wavelength ⁇ 1u transmitted from the subscriber unit 120a-1 passes through the optical SW 130a, the quality compensator 860-1, and the optical SW 130a in this order, and then passes through the wavelength multiplexer/demultiplexer 140a-1. Input to transmission path 150-1.
- An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- Signals between subscriber units 120 may pass through multiple quality compensators 860 .
- the port connection determination unit 175 determines the port connection relationship of the optical SW 130 in the same manner as in the embodiment described above so that the quality compensation unit 860 selected by the selection unit 174 is passed through.
- the dispersion compensator 160 and the optical amplifier 560 are combined to form a quality compensator 860 .
- the cumulative chromatic dispersion and cumulative loss may be determined according to the fiber length of the optical transmission line 150. FIG. Therefore, this configuration becomes possible.
- the optical communication system of the ninth embodiment measures the transmission distance between subscriber units while not reducing the throughput of the main signal, and selects the quality compensator for the main signal based on the measurement result.
- a low-speed management control signal (hereinafter also referred to as “control signal”) that is superimposed on a high-speed main signal and transmitted is used for the measurement.
- the quality compensator is a dispersion compensator.
- the subscriber unit uses the management control signal to measure the transmission distance to the subscriber unit of the communication destination.
- the management controller selects the dispersion compensator with the optimum amount of dispersion compensation based on the measured transmission distance.
- the management controller sets the optical path between the subscriber units to pass through the selected dispersion compensator, as in the above-described embodiment.
- the subscriber unit can obtain the desired reception sensitivity for the high-speed main signal while preventing the throughput of the main signal from deteriorating. This embodiment will be described with a focus on differences from the above-described embodiment.
- FIG. 14 is a diagram showing the configuration of an optical communication system 1110 according to the ninth embodiment.
- the optical communication system 1110 has a subscriber unit 1120 , an optical SW 130 , a wavelength multiplexing/demultiplexing unit 140 , an optical transmission line 150 , a dispersion compensation unit 160 and a management control device 1170 . That is, the optical communication system 1110 has a subscriber device 1120 and a management control device 1170 instead of the subscriber device 120 and the management control device 170 of the optical communication system 110 shown in FIG.
- the optical signals output by the subscriber units 1120a-n and received by the subscriber units 1120b-n have the wavelength ⁇ nu.
- a wavelength ⁇ nd is used for the signal.
- the opposing subscriber units 1120a-n and 1120b-n are connected via optical SWs 130a, 130b, wavelength multiplexing/demultiplexing units 140a-n, 140b-n, and optical transmission lines 150-n. .
- the management control device 1170 is an example of a control device that controls the optical path within the optical SW 130 .
- the management control device 1170 has a management control section 1171 .
- Management control unit 1171 has storage unit 1172 , allocation unit 1173 , selection unit 1174 , port connection determination unit 1175 , and notification unit 1176 .
- the storage unit 1172 stores first selection information that associates the transmission distance with the amount of dispersion compensation or dispersion compensation unit information.
- the dispersion compensator information is the same as the quality compensator information included in the first parameter table, and indicates the usable dispersion compensator 160 . That is, the usable dispersion compensator 160 is the dispersion compensator 160 that performs quality compensation according to the degree of quality deterioration of the optical signal when the optical signal is transmitted through the transmission line.
- the allocation unit 1173 allocates resources to be used for optical paths between the subscriber units 1120 and determines signal parameter values by the same function as the allocation unit 173 of the management control device 170 of the above-described embodiment. Another device connected to the management control device 1170 may have the allocation unit 1173 .
- the selection unit 1174 receives from the subscriber unit 1120 information on the transmission distance between the subscriber unit 1120 that outputs the optical signal and the subscriber unit 1120 that receives the optical signal.
- the selection unit 1174 reads the dispersion compensation amount or the dispersion compensation unit information corresponding to the transmission distance from the first selection information stored in the storage unit 1172 .
- the selection unit 1174 selects the dispersion compensation unit 160 that performs dispersion compensation for the dispersion compensation amount.
- the selector 1174 selects the dispersion compensator 160 to be used from among the dispersion compensators 160 indicated by the read dispersion compensator information.
- the number of dispersion compensators 160 to be selected may be one, or two or more.
- the port connection determination unit 1175 has the same function as the port connection determination unit 175 of the management control device 170 of the embodiment described above. That is, the port connection determining unit 1175 determines the port connection relationship within the optical SW 130 for passing through the dispersion compensating unit 160 selected by the selecting unit 1174 on the optical path between the subscriber units 1120 .
- the notification unit 1176 has the same function as the notification unit 176 of the management control device 170 of the embodiment described above. In other words, the notification unit 1176 notifies the subscriber unit 1120 that outputs the optical signal and the subscriber unit 1120 that receives the optical signal of the resources and signal parameter values determined by the allocation unit 1173 . In addition, notification section 1176 notifies optical SW 130 of the port connection relationship determined by port connection determination section 1175 .
- FIG. 15 is a diagram showing the configuration of the subscriber device 1120.
- the subscriber unit 1120 includes a signal mixer 1121 , an optical transmitter 1122 , an optical multiplexer/demultiplexer 1123 , an optical receiver 1124 , a signal divider 1125 and a management controller 1126 .
- the signal mixer 1121 outputs to the optical transmission section 1122 a transmission signal in which the control signal of the electrical signal output by the management control section 1126 is superimposed on the main signal, which is the input data of the electrical signal.
- the control signal is AMCC with a lower frequency than the main signal.
- the optical transmitter 1122 converts the electrical signal input from the signal mixer 1121 into an optical signal having the signal parameters and the transmission wavelength notified from the management controller 1170 and outputs the converted optical signal to the optical multiplexer/demultiplexer 1123 .
- the optical transmitter 1122 may use preset signal parameters and the like.
- the optical multiplexer/demultiplexer 1123 outputs the optical signal input from the optical transmitter 1122 to the optical transmission line between the optical SW 130 . Also, the optical multiplexer/demultiplexer 1123 inputs an optical signal from an optical transmission line to the optical SW 130 , and outputs an optical signal of the reception wavelength notified from the management controller 1170 to the optical receiver 1124 .
- the optical receiver 1124 converts the optical signal input from the optical multiplexer/demultiplexer 1123 into an electrical signal using the signal parameter notified from the management control device 1170, and outputs the converted electrical signal.
- the optical receiver 1124 may use preset signal parameters and the like.
- the signal divider 1125 separates the electrical signal output from the optical receiver 1124 into the output data of the main signal and the control signal according to frequency.
- the management control unit 1126 outputs an electric signal control signal to the signal mixer 1121 . Also, the management control unit 1126 receives the control signal of the electrical signal separated by the signal divider 1125 . Management control section 1126 includes transmission distance measurement section 1127 . The transmission distance measurement unit 1127 calculates the transmission distance to the subscriber device 1120 of the communication destination based on the control signal transmitted/received to/from the subscriber device 1120 of the communication destination. The transmission distance measurement unit 1127 notifies the management control device 1170 of the calculated transmission distance via the control signal communication path 1190 .
- FIG. 16 is a sequence diagram showing the operation of selecting the dispersion compensator of the optical communication system 1110.
- FIG. 16 shows an example of subscriber unit 1120a-1 communicating with subscriber unit 1120b-1.
- the optical SW 130a and the optical SW 130b connect the input port and the output port so that the subscriber device 1120a-1 and the subscriber device 1120b-1 are connected without going through the dispersion compensator 160 (step S1101).
- the optical communication system 1110 performs the processes of steps S101 to S106 and S108 to S114 of the first embodiment shown in FIG. That is, the allocation unit 1173 of the management control device 1170 assigns the optical signal transmitted from the subscriber unit 1120a-1 to the optical SW 130a, the wavelength multiplexing/demultiplexing unit 140a-1, the optical transmission line 150-1, the wavelength multiplexing/demultiplexing unit. 140b-1 and the optical SW 130b to the subscriber unit 1120b-1.
- the allocation unit 1173 allocates the wavelength ⁇ 1u to this optical path. Therefore, the determined optical paths include the path P1 of the optical SW 130a shown in FIG.
- the path P1 is from the input port 131 connected to the subscriber unit 1120a-1 in the optical SW 130a to the output port 132 connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexer/demultiplexer 140a-1.
- the allocation unit 1173 assigns the optical signal transmitted from the subscriber unit 1120b-1 to the optical SW 130b, the wavelength multiplexing/demultiplexing unit 140b-1, the optical transmission line 150-1, the wavelength multiplexing/demultiplexing unit 140a-1 and An optical path is determined to output to the subscriber unit 1120a-1 via the optical SW 130a.
- the allocation unit 1173 allocates the wavelength ⁇ 1u to this optical path.
- the allocation unit 1173 ensures that the optical path from the subscriber device 1120a-1 to the subscriber device 1120b-1 and the optical path from the subscriber device 1120b-1 to the subscriber device 1120a-1 are the same transmission line. decide to use
- the allocation unit 1173 determines signal parameter values to be used for these optical paths.
- the notification unit 1176 notifies the subscriber device 1120a-1 and the subscriber device 1120b-1 of the communication wavelength and signal parameters. Further, the port connection determination unit 1175 determines the port connection relationship between the optical SW 130a and the optical SW 130b, and notifies the optical SW 130a and the optical SW 130b. The optical SW 130a and the optical SW 130b connect the input port 131 and the output port 132 according to the notified port connection relationship.
- the above is the same as the processing up to step S914 in FIG.
- the optical communication system 1110 performs the processing up to step S914 in FIG. 35 or the processing up to step S913 in FIG. good too.
- the subscriber device 1120a-1 transmits a message M1 in which the AMCC signal is set (step S1102). That is, the signal mixer 1121 outputs to the optical transmission unit 1122 a message M1 in which the AMCC signal output by the management control unit 1126 is superimposed on the electrical signal input data.
- the optical transmitter 1122 converts the message M1 from an electrical signal to an optical signal of wavelength ⁇ 1u.
- the optical multiplexer/demultiplexer 1123 outputs an optical signal message M1.
- the message M1 transmitted from the subscriber unit 1120a-1 is input to the optical transmission line 150-1 via the path P1 of the optical SW 130a and the wavelength multiplexer/demultiplexer 140a-1.
- the message M1 input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 1120b-1.
- the subscriber device 1120b-1 receives the AMCC signal superimposed on the message M1 (step S1103). That is, the optical multiplexer/demultiplexer 1123 of the subscriber unit 1120b-1 outputs the message M1 to the optical receiver 1124.
- FIG. Optical receiver 1124 converts message M1 from an optical signal to an electrical signal.
- the management control unit 1126 receives the AMCC signal that the signal divider 1125 separated from the electrical signal message M1.
- the subscriber device 1120b-1 performs the same processing as the subscriber device 1120a-1 in step S1102, and transmits a message M2 of wavelength ⁇ 1d in which the AMCC signal is set (step S1104).
- the message M2 transmitted from the subscriber unit 1120b-1 is input to the optical transmission line 150-1 via the optical SW 130b and the wavelength multiplexer/demultiplexer 140b-1.
- the message M2 input from the optical transmission line 150-1 to the optical SW 130a via the wavelength multiplexer/demultiplexer 140a-1 is output to the subscriber unit 1120a-1.
- the subscriber device 1120a-1 performs processing similar to that of the subscriber device 1120b-1 in step S1103, and receives the AMCC signal superimposed on the message M2 (step S1105).
- Transmission distance measuring section 1127 of subscriber device 1120a-1 uses the received AMCC signal to measure RTT (Round Trip Time) between subscriber device 1120a-1 and subscriber device 1120b-1, and Using the calculated RTT, the transmission distance is calculated (step S1106).
- RTT Red Trip Time
- the transmission distance measurement unit 1127 transmits transmission distance information indicating the calculated transmission distance to the management control device 1170 (step S1107).
- the selector 1174 of the management controller 1170 determines the dispersion compensator 160 to be used for the optical signal from the subscriber device 1120a-1 to the subscriber device 1120b-1 based on the transmission distance information (step S1108). Specifically, the selection unit 1174 reads the dispersion compensation amount corresponding to the transmission distance information from the first selection information, and selects the dispersion compensation unit 160 that performs dispersion compensation for the read dispersion compensation amount. When reading the dispersion compensator information corresponding to the transmission distance information from the first selection information, the selector 1174 selects the dispersion compensator 160 to be used from the dispersion compensators 160 indicated by the read dispersion compensator information. Here, it is assumed that dispersion compensator 160-1 is selected.
- the port connection determining unit 1175 selects the optical path from the subscriber unit 1120a-1 to the subscriber unit 1120b-1 in the optical SW 130a connected to the dispersion compensating unit 160-1 by the selecting unit 1174. 160-1 to determine the port connection relationship between the input port 131 and the output port 132 (step S1109). Specifically, the port connection determination unit 1175 outputs the optical signal input from the input port 131 connected to the subscriber unit 1120a-1 to the output port 132 connected to the dispersion compensator 160-1. , the port connection of the path P2 in the optical SW 130a is determined.
- the port connection determination unit 1175 connects the optical signal input from the input port 131 to which the dispersion compensator 160-1 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexer/demultiplexer 140a-1.
- the port connection relation of the path P3 in the optical SW 130a is determined so as to output to the output port 132 that is connected.
- the notification unit 1176 notifies the optical SW 130a of the port connection relationship of the optical SW 130a determined by the selection unit 1174 (step S1110).
- the optical SW 130a connects the input port 131 and the output port 132 according to the port connection relation notified in step S1110 (step S1111).
- the subscriber device 1120a-1 and the subscriber device 1120b-1 start communication of the main signal (step S1112).
- the optical signal of wavelength ⁇ 1u transmitted from the subscriber unit 1120a-1 passes through the optical SW 130a, the dispersion compensator 160-1, and the optical SW 130a in order, and then passes through the wavelength multiplexer/demultiplexer 140a-1 to the optical transmission line 150. Enter -1.
- An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- the optical SW 130a may transmit a setting completion notification to the subscriber devices 1120a-1 and 1120b-1 via the management control device 170 after the port connection setting in step S1111 is completed. . After receiving the setting completion notification, the subscriber unit 1120a-1 and the subscriber unit 1120b-1 start communication of the optical signal of the main signal.
- optical signals between subscriber units 1120 may pass through a plurality of dispersion compensators 160 .
- the combination of dispersion compensators 160 to be used is set in the dispersion compensator information.
- the selector 1174 selects the dispersion compensator 160-1 and the dispersion compensator 160-2 for the optical signal from the subscriber device 1120a-1 to the subscriber device 1120b-1. do.
- the port connection determining section 1175 determines the port connection relationship of the optical SW 130a in the same manner as when the dispersion compensating section 160-1 and the dispersion compensating section 160-2 are selected in the first embodiment.
- the optical communication system 1110 inserts a wavelength multiplexer/demultiplexer 440a-k-1 and a wavelength multiplexer/demultiplexer 440a-k-2 between the optical SW 130a and the dispersion compensator 160-k.
- the port connection determining unit 1175 of the management control unit 1170 sets the input port of the optical SW 130a so that the optical signal from the subscriber unit 1120b-1 to the subscriber unit 1120a-1 passes through the dispersion compensation unit 160-1. 131 and output port 132 may be determined.
- the notification unit 1176 notifies the optical SW 130a of the port connection relationship of the optical SW 130a determined by the selection unit 1174.
- a wavelength separation filter 280 similar to that of the second embodiment shown in FIG. 4 may be provided between the subscriber unit 1120 and the optical SW 130.
- the optical signal of wavelength ⁇ 1d from the subscriber unit 1120b-1 to the subscriber unit 1120a-1 has a different input port than the optical signal from the subscriber unit 1120a-1 to the subscriber unit 1120b-1.
- 131 and output port 132 are used.
- the port connection determination unit 175 optically directs the optical signal from the subscriber unit 1120b-1 to the subscriber unit 1120a-1 to pass through the dispersion compensator 160-1 determined in step S1108.
- the port connection relationship of SW 130a may be further determined.
- the port connection determining unit 175 causes the optical SW 130a to connect the optical signal input from the output port 132 connected to the first port of the wavelength ⁇ 1d of the wavelength multiplexing/demultiplexing unit 140a-1 to the dispersion compensation unit 160-1. and outputs the optical signal input from the output port 132 to which the dispersion compensator 160-1 is connected to the input port 131 connected to the subscriber unit 120a-1.
- the port connection relationship of the optical SW 130a is determined as follows.
- the notification unit 1176 further notifies the optical SW 130a of the port connection relationship of the optical SW 130a determined for the optical signal from the subscriber device 1120b-1 to the subscriber device 1120a-1.
- the selector 174 uses the dispersion compensator 160-3 with the same amount of dispersion compensation as the dispersion compensator 160-1 determined in step S1108 for the optical signal from the subscriber device 1120b-1 to the subscriber device 1120a-1. You can then decide.
- the port connection determination unit 1175 determines the port connection relationship of the optical SW 130b, as in the second embodiment. An optical signal input from the input port 131 connected to the subscriber unit 120b-1 is output from the output port 132 connected to the first port of the wavelength ⁇ 1d of the wavelength multiplexer/demultiplexer 140b-1.
- connection relationship between the input port 131 and the output port 132 is such that the input port 131 and the output port 132 pass through the dispersion compensator 160-3.
- the notification unit 1176 notifies the optical SW 130b of the port connection relationship of the optical SW 130b determined by the selection unit 1174.
- FIG. The optical SW 130b connects the input port 131 and the output port 132 according to the notified port connection relationship.
- FIG. 17 is a diagram showing a method of calculating the transmission distance.
- FIG. 17 corresponds to the processing of steps S1102 to S1106 in FIG.
- the transmission distance measurement unit 1127 of the subscriber device 1120a-1 and the transmission distance measurement unit 1127 of the subscriber device 1120b-1 are provided with counters representing time. That is, the counter counts up at predetermined intervals. First, time synchronization must be established between the transmission distance measurement unit 1127 of the subscriber device 1120a-1 and the transmission distance measurement unit 1127 of the subscriber device 1120b-1.
- the transmission distance measuring unit 1127 of the subscriber device 1120a-1 transmits the current value of the counter of its own device to the subscriber device 1120b-1 as time stamp information. Transmission of the time stamp information is performed using an AMCC signal. Transmission distance measuring section 1127 of subscriber device 1120b-1 updates the counter value of its own device according to the received time stamp value.
- Subscriber unit 1120a-1 measures RTT, which is the frame round-trip time.
- T-- AMCC be the frame length of the AMCC signal.
- the frame length represents the time required from the start of frame transmission to the end of transmission.
- transmission distance measurement section 1127 of subscriber device 1120a-1 completes reception of message M2 from subscriber device 1120b- 1 when the counter of its own device is t4.
- This message M2 includes the time stamp Ts2 set by the transmission distance measuring section 1127 of the subscriber unit 1120b -1.
- Timestamp t s2 describes the counter value t 3 of the subscriber unit 1120b-1 when the transmission distance measurement unit 1127 of the subscriber unit 1120b-1 starts sending the message M2.
- the reference point from which the subscriber unit 1120 reads the counter value when transmitting the time stamp is the beginning of the frame of the AMCC signal, and the reference point for reading the counter value described in the message when receiving the time stamp is the frame of the AMCC signal. is the end point of In this case, the RTT between the subscriber device 1120a-1 and the subscriber device 1120b-1 is calculated by the following equation (1) after correcting the time required for frame reception.
- the AMCC signal is 100 kbps (kilobits per second), it takes 10 us to transmit 1 bit. If the AMCC frame consists of 8 bits, the frame length is 80us.
- RTT becomes the following formula (2).
- t3 is the same as the value of the time stamp ts2 of the message M2, so it can also be expressed as the following equation ( 3 ).
- the transmission distance measurement unit 1127 of the subscriber unit 1120a- 1 obtains the counter value t4 of the time when the reception of the message M2, which is an upstream control frame, is completed, and the time stamp ts2 written in the message M2.
- the RTT with the subscriber unit 1120b-1 that sent the message M2 can be obtained from equation (3).
- This RTT calculation method is referred to as a first RTT calculation method.
- FIG. 18 is a diagram showing an example in which an error occurs in the first RTT calculation method. This error occurs when the timing of reading the counter value of the subscriber unit 1120a-1 on the transmitting side does not match the arrival timing of the frame. If subscriber unit 1120a-1 fails to transmit message M1 including time stamp t s1 with counter value t 1 set in current frame F11, subscriber unit 1120a-1 transmits message M1 in next frame F12. Similarly, subscriber unit 1120b-1 will send message M2 in the next frame F22 if it cannot send message M2 including time stamp t s2 with counter value t 3 set in current frame F21. Thus, if the subscriber unit 1120 cannot send a signal in the current frame, it waits until the next frame to send the signal. In this case, the RTTs measured at the subscriber unit 1120a-1 are RTT+2T AMCC to RTT+4T AMCC . Therefore, an error of up to 2T AMCC occurs.
- FIG. 19 is a diagram showing the second RTT calculation method.
- the transmission distance measurement unit 1127 of the subscriber unit 1120a- 1 that transmits AMCC detects the beginning of the AMCC frame F11, and reads the counter value t1 at the timing of detecting the beginning. Subsequently, the transmission distance measurement unit 1127 writes the read counter value t1 to the time stamp ts1 of the frame F12 next to the frame F11 in which the top is detected.
- Subscriber unit 1120a-1 transmits frame F12 as message M1. There is a difference of 2T AMCC between the time when the counter value t 1 is detected by the subscriber unit 1120a-1 and the time when the transmission of the frame F12 describing the counter value t 1 is completed.
- the transmission distance measurement unit 1127 of the subscriber unit 1120b-1 detects the beginning of the AMCC frame F21 , and reads the counter value t3 at the timing of detecting the beginning.
- the transmission distance measurement unit 1127 writes the read counter value t3 to the time stamp ts2 of the frame F22 next to the frame F21 in which the head is detected.
- Subscriber unit 1120b-1 transmits frame F22 as message M2. There is a difference of 2T AMCC between the time when the counter value t3 is detected in the subscriber unit 1120b - 1 and the time when the transmission of the frame F22 describing the counter value t3 is completed.
- the RTT between the subscriber device 1120a-1 and the subscriber device 1120b-1 is calculated by the following equation (4) after correcting the time required for frame transmission/reception.
- the transmission distance measurement unit 1127 of the subscriber device 1120a-1 and the transmission distance measurement unit 1127 of the subscriber device 1120b-1 determine the frame F' describing the time stamp value based on the detected start position of the frame F.
- a counter value at the top position is calculated, and the calculated counter value is set to the time stamp of the frame F'.
- the RTT between the subscriber device 1120a-1 and the subscriber device 1120b-1 is calculated by the following equation (5).
- the transmission distance measurement unit 1127 of the subscriber unit 1120a-1 calculates the RTT by any one of the first to third RTT calculation methods, and calculates the transmission distance based on the calculated RTT.
- the reference point for reading the counter value when sending the timestamp and the reference point for reading the counter value described in the message when receiving the timestamp shall use 1 byte at a predetermined location in the AMCC signal frame. is common. However, since the AMCC signal is low speed, the measured RTT value fluctuates greatly depending on which time in one byte is referred to. For example, if the AMCC signal is 100 kbps (kilobits per second), it takes 80 us to transmit 1 byte. Therefore, the distance measurement using the AMCC signal described above may be inaccurate. Therefore, in step S1108, the selection unit 1174 of the management control device 1170 may extract a plurality of usable dispersion compensator 160 candidates instead of selecting one dispersion compensator 160 to be used.
- the selecting unit 1174 selects one dispersion compensating unit 160 randomly or according to a predetermined rule from the extracted candidates for the dispersion compensating unit 160 .
- the optical communication system 1110 performs the processes after step S1109.
- the management control unit 1126 of the subscriber device 1120a-1 or the management control of the subscriber device 1120b-1 is performed.
- the unit 1126 detects that the main signal cannot be correctly received, such as when the communication quality is lower than the predetermined value, the unit 1126 notifies the management control device 1170 of reception abnormality.
- the selection unit 1174 of the management control device 1170 selects an unselected dispersion compensator 160 from among the candidates for the dispersion compensator 160 extracted in step S1108. After that, the optical communication system 1110 performs the processes after step S1109.
- the transmission distance information received from the subscriber unit 1120a-1 is "transmission distance 10 km to 20 km".
- the first quality compensator information is set such that the transmission distance of 0 to 15 km corresponds to the dispersion compensator 160-1, and that the transmission distance of 15 to 20 km corresponds to the dispersion compensator 160-2.
- selection section 1174 of management control device 1170 selects dispersion compensation section 160-1 and dispersion compensation section 160-2 as candidates. Selecting section 1174 first selects dispersion compensating section 160-1.
- the port connection determining unit 1175 determines the port connection relationship between the input port 131 and the output port 132 in the optical SW 130a so that the signal passes through the dispersion compensating unit 160-1.
- the selection unit 1174 selects the dispersion compensation unit 160-2 when receiving the notification that the main signal cannot be received normally.
- the port connection determination unit 1175 determines the port connection relationship between the input port 131 and the output port 132 so that the optical SW 130a does not pass through the dispersion compensation unit 160-1 but passes through the dispersion compensation unit 160-2.
- the subscriber unit 1120 transmits transmission distance information to the management control unit 1170 via the control signal communication path 1190.
- the subscriber unit 1120 transmits the transmission distance information to the optical signal. Information may be set and sent.
- FIG. 20 is a diagram showing the configuration of the optical communication system 1111. As shown in FIG. 14, the same parts as those of the optical communication system 1110 shown in FIG.
- the optical communication system 1111 shown in FIG. 20 differs from the optical communication system 1110 shown in FIG. 14 in that control signal extraction devices 1180 are provided near the wavelength multiplexing/demultiplexing units 140 at both ends of the optical transmission line 150 .
- the subscriber device 1120 does not have to be connected to the management control device 1170 via the control signal communication path 1190 .
- the subscriber unit 1120 transmits an optical signal in which transmission distance information is set.
- the subscriber unit 1120 transmits a control signal in which transmission distance information is set by an optical signal.
- an out-band method in which the control signal of the AMCC signal is superimposed on the main signal and transmitted may be used, or an in-band method in which the control signal is set within the overhead of the protocol may be used.
- the management control device 1170 extracts the transmission distance information set in the optical signal by the subscriber unit 1120 and notifies the management control device 1170 of it.
- FIG. 21 is a diagram showing the configuration of the control signal extraction device 1180.
- the control signal extraction device 1180 includes an optical splitter 1181 , a wavelength multiplexer/demultiplexer 1182 , and a control receiver (Rx) 1183 .
- the optical splitter 1181 splits the optical signal transmitted through the optical transmission line 150 .
- An optical signal transmitted through the optical transmission line 150 is an optical signal wavelength-multiplexed by the wavelength multiplexing/demultiplexing unit 140 .
- the optical signal includes a main signal and a control signal.
- the optical splitter 1181 outputs the split optical signal to the wavelength multiplexer/demultiplexer 1182 .
- the wavelength multiplexing/demultiplexing unit 1182 has one input port (not shown) and H (H is an integer equal to or greater than 2) output ports (not shown).
- Each of the H output ports corresponds to a different wavelength.
- the input port is connected to the optical splitter 1181 .
- the H output ports are connected to control receivers 1183 .
- the wavelength multiplexing/demultiplexing unit 1182 demultiplexes the optical signal input from the optical branching unit 1181 through the input port into optical signals of different wavelengths, and outputs the demultiplexed optical signals from separate output ports.
- Each demultiplexed optical signal includes a main signal and a control signal.
- the control receiver 1183 has optical receivers (Rx) 1184-1 to 1184-H and separators 1185-1 to 1185-H.
- Optical receiver 1184-h (h is an integer from 1 to H) receives the optical signal demultiplexed by optical splitter 1181 and converts the input optical signal into an electrical signal.
- the optical receiver 1184-h outputs the converted optical signal to the separator 1185-h.
- Separating section 1185-h separates the control signal from the electrical signal input from optical receiver 1184-h. Separating section 1185 - h outputs the separated control signal to management control device 1170 .
- the subscriber unit 1120a-1 transmits an optical signal of wavelength ⁇ 1u in which a control signal in which transmission distance information is set and a main signal are superimposed.
- the wavelength multiplexer/demultiplexer 140a-1 multiplexes the optical signals of wavelengths ⁇ 1u to ⁇ Hu output from the optical SW 130a, and outputs the multiplexed optical signals to the optical transmission line 150-1.
- the optical splitter 1181 of the control signal extraction device 1180 splits the optical signal transmitted through the optical transmission line 150 .
- the wavelength multiplexing/demultiplexing unit 1182 demultiplexes the optical signal split by the optical splitting unit 1181 into optical signals of wavelengths ⁇ 1u to ⁇ Hu, and inputs the demultiplexed optical signals of wavelength ⁇ hu to the optical receiver 1184-h.
- the optical receiver 1184-1 converts the optical signal of wavelength ⁇ 1u into an electrical signal.
- Separating section 1185 - 1 separates the control signal from the electrical signal input from optical receiver 1184 - 1 and outputs the separated control signal to management control device 1170 .
- the first selection information may be information in which the transmission distance and signal parameters are associated with the amount of dispersion compensation or dispersion compensator information.
- the selector 1174 selects the dispersion compensator 160 based on the dispersion compensation amount or the dispersion compensator information corresponding to the transmission distance and the signal parameter assigned to the subscriber unit 1120 .
- the dispersion compensator is used as the quality compensator.
- the optical amplifier is used as the quality compensator. Processing similar to that of the ninth embodiment is performed. This embodiment will be described with a focus on differences from the ninth embodiment.
- FIG. 22 is a diagram showing the configuration of an optical communication system 1210 according to the tenth embodiment.
- the optical communication system 1210 shown in FIG. 22 differs from the optical communication system 1110 shown in FIG. 14 in that the optical amplifier 560 shown in FIG.
- the gains of the K optical amplifiers 560 (K is an integer equal to or greater than 1) are different.
- One optical signal may be amplified by any one of the optical amplifiers 560 or may be amplified by a plurality of optical amplifiers 560 .
- the storage unit 1172 of the management control device 1170 stores second selection information that associates the transmission distance with the optical amplification gain or optical amplification unit information.
- the optical amplifier information is the same as the optical amplifier information contained in the second parameter table and indicates usable optical amplifiers 560 .
- the selector 1174 receives from the subscriber unit 1120 information on the transmission distance between the subscriber unit 1120 that outputs the optical signal and the subscriber unit 1120 that receives the optical signal.
- the selection unit 1174 reads the optical amplification gain or the optical amplification unit information corresponding to the transmission distance from the second selection information stored in the storage unit 1172 . When the optical amplification gain is read out, the selection section 1174 selects the optical amplification section 560 for that optical amplification gain.
- the selector 1174 reads the optical amplifier information, it selects the optical amplifier 560 to be used from among the optical amplifiers 560 indicated by the read optical amplifier information.
- the number of selected optical amplifiers 560 may be one, or two or more.
- the optical communication system 1210 operates similarly to the operation of the optical communication system 1110 of the ninth embodiment shown in FIG. 16, except for the following points. That is, in step S1108, the selection unit 1174 of the management control device 1170 selects an optical signal from the subscriber device 1120a-1 to the subscriber device 1120b-1 based on the transmission distance information notified from the subscriber device 1120a-1.
- the optical amplifier 560 to be used is determined. Specifically, the selector 1174 reads the optical amplification gain corresponding to the transmission distance information from the second selection information, and selects the optical amplifier 560 with the read optical amplification gain.
- the selection unit 1174 When the selection unit 1174 reads the optical amplification unit information corresponding to the transmission distance information from the second selection information, the selection unit 1174 selects the optical amplification unit 560 to be used from the optical amplification units 560 indicated by the read optical amplification unit information. Assume here that the optical amplifier 560-1 is selected.
- the port connection determination unit 1175 determines that the optical signal from the subscriber unit 1120a-1 to the subscriber unit 1120b-1 has been selected by the selection unit 1174 in the optical SW 130a connected to the optical amplification unit 560-1.
- the port connection relationship between the input port 131 and the output port 132 is determined so that the signal goes through the optical amplifier 560-1.
- the port connection determination unit 1175 outputs the optical signal input from the input port 131 connected to the subscriber unit 1120a-1 to the output port 132 connected to the optical amplifier unit 560-1. Determine the port connection of the path P2 in the optical SW 130a.
- the port connection determination unit 1175 connects the optical signal input from the input port 131 to which the optical amplifier 560-1 is connected to the first port corresponding to the wavelength ⁇ 1u of the wavelength multiplexer/demultiplexer 140a-1.
- the port connection relation of the path P3 in the optical SW 130a is determined so as to output to the output port 132 which is connected.
- step S1112 when the subscriber unit 1120a-1 and the subscriber unit 1120b-1 start communication of the main signal, the optical signal of wavelength ⁇ 1u transmitted from the subscriber unit 1120a-1 is transferred to the optical SW 130a and the optical amplifier 560. -1 and the optical SW 130a, and then input to the optical transmission line 150-1 via the wavelength multiplexer/demultiplexer 140a-1. An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- optical signals between subscriber units 1120 may pass through a plurality of optical amplifiers 560 .
- the combination of optical amplifiers 560 to be used is set in the optical amplifier information.
- the selector 1174 selects the optical amplifier 560-1 and the optical amplifier 560-2 for the optical signal from the subscriber device 1120a-1 to the subscriber device 1120b-1. do.
- the port connection determination unit 1175 determines the port connection relationship of the optical SW 130a in the same manner as when the optical amplification units 560-1 and 560-2 are selected in the fifth embodiment.
- the selection unit 1174 of the management control device 1170 extracts a plurality of candidates for the usable optical amplification unit 560, and selects the optical amplification unit 560 from among the candidates. may When the selection unit 1174 receives a reception abnormality such as communication quality lower than predetermined from the subscriber unit 1120, the selection unit 1174 selects an unselected optical amplification unit 560 from among the candidates, and performs the processing from step S1109.
- the optical communication system 1210 inserts a wavelength multiplexer/demultiplexer 440a-k-1 and a wavelength multiplexer/demultiplexer 440a-k-2 between the optical SW 130a and the optical amplifier 560-k.
- the optical communication system 1210 may include the quality compensator 860 of the eighth embodiment instead of the optical amplifier 560 .
- storage section 1172 stores third selection information that associates transmission distances with available quality compensation sections 860 .
- the selection unit 1174 of the management control device 1170 uses the third selection information for the optical signal from the subscriber device 1120a-1 to the subscriber device 1120b-1 based on the transmission distance information notified from the subscriber device 1120a-1.
- the quality compensator 860 to be used is determined.
- the second selection information may be information in which the transmission distance and signal parameters are associated with amplification gain or optical amplifier information.
- the selector 1174 selects the optical amplifier 560 based on the amplification gain or optical amplifier information corresponding to the transmission distance and the signal parameters assigned to the subscriber unit 1120 .
- the third selection information may be third selection information that associates transmission distances and signal parameters with usable quality compensators 860 . Selector 1174 selects quality compensator 860 set in the third selection information corresponding to the transmission distance and the signal parameter assigned to subscriber unit 1120 .
- the optical communication system of this embodiment has a plurality of dispersion compensators with different amounts of dispersion and a plurality of optical amplifiers with different gains. This embodiment will be described with a focus on differences from the ninth and tenth embodiments.
- FIG. 23 is a diagram showing the configuration of an optical communication system 1310 according to the eleventh embodiment.
- the optical communication system 710 shown in FIG. 23 differs from the optical communication system 1110 shown in FIG. 14 in that it further includes the optical amplifier 560 of the tenth embodiment shown in FIG.
- Some of the input ports 131 and some of the output ports 132 of the optical SW 130a are connected to optical amplifiers 560-1 to 560-K via optical transmission lines.
- the storage unit 1172 of the management control device 1170 stores the first selection information and the second selection information.
- the storage unit 1172 may store fourth selection information that integrates the first selection information and the second selection information.
- the optical communication system 1310 operates similarly to the optical communication system 1110 of the ninth embodiment, except for the following points. That is, in step S1108 of FIG. 16, the selection unit 1174 of the management control device 1170 selects the transmission distance information notified from the subscriber device 1120a-1 and the transmission distance information stored in the storage unit 1172, as in the first embodiment.
- the dispersion compensator 160 to be used is selected on the basis of the first selection information included therein.
- the selection unit 1174 uses the transmission distance information notified from the subscriber unit 1120a-1 and the second selection information stored in the storage unit 1172. Select the optical amplifier 560 . Note that the selection unit 1174 may use the fourth selection information instead of the first selection information and the second selection information.
- dispersion compensator 160-1 and optical amplifier 560-1 are selected.
- the port connection determination unit 1175 determines that the optical path from the subscriber unit 1120a-1 to the subscriber unit 1120b-1 is selected by the selection unit 1174 in the optical SW 130a connected to the optical amplification unit 560-1.
- the port connection relationship between the input port 131 and the output port 132 is determined so that the signal passes through the dispersion compensator 160-1 and the optical amplifier 560-1.
- the port connection determination unit 1175 determines the path P11 so that the optical signal input from the input port 131 connected to the subscriber unit 120a-1 is output to the output port 132 connected to the dispersion compensator 160-1.
- the port connection determination unit 1175 uses the path P12 to output the optical signal input from the input port 131 to which the dispersion compensator 160-1 is connected to the output port 132 to which the optical amplifier 560-1 is connected.
- the port connection relation of path P13 is determined so as to output to the output port 132 that is set.
- step S1112 when the subscriber unit 1120a-1 and the subscriber unit 1120b-1 start communication of the main signal, the optical signal of wavelength ⁇ 1u transmitted from the subscriber unit 1120a-1 is transferred to the optical SW 130a and the dispersion compensator 160. -1, the optical SW 130a, the optical amplifier 560-1, and the optical SW 130a, and then input to the optical transmission line 150-1 via the wavelength multiplexing/demultiplexing unit 140a-1. An optical signal input from the optical transmission line 150-1 to the optical SW 130b via the wavelength multiplexer/demultiplexer 140b-1 is output to the subscriber unit 120b-1.
- Signals between subscriber units 1120 may pass through a plurality of dispersion compensators 160 and may pass through a plurality of optical amplifiers 560 .
- the port connection determination unit 1175 establishes the port connection relationship of the optical SW 130 through the one or more dispersion compensators 160 selected by the selection unit 1174 and the one or more optical amplifiers 560 as in the above-described embodiment. decide.
- the port connection determination unit 1175 may connect the input port and the output port of the optical SW 130a so as not to pass through one or both of the dispersion compensation unit 160 and the optical amplification unit 560.
- the optical communication system 1310 includes a wavelength multiplexer/demultiplexer 440a-k-1 and a wavelength multiplexer/demultiplexer 440a-k between the optical SW 130a and the dispersion compensator 160-k. -2 may be inserted, and a wavelength multiplexing/demultiplexing unit 440a-k-1 and a wavelength multiplexing/demultiplexing unit 440a-k-2 may be inserted between the optical SW 130a and the optical amplifier 560-k.
- the subscriber unit is provided with a dispersion compensator. This embodiment will be described with a focus on differences from the above-described ninth to eleventh embodiments.
- FIG. 24 is a diagram showing the configuration of an optical communication system 1510 according to the twelfth embodiment.
- the optical communication system 1510 shown in FIG. 24 differs from the optical communication system 1110 shown in FIG. The difference is that the optical SW 130 is not connected to the dispersion compensator 160 .
- the management control device 1570 has a management control section 1571 .
- Management control unit 1571 has allocation unit 1173 , port connection determination unit 1175 , and notification unit 1572 .
- the notification unit 1572 notifies the transmission distance information notified from the subscriber device 1520 to the communication destination subscriber device 1520 of the notification source subscriber device 1520 . Also, the notification unit 1572 notifies the optical SW 130 of the port connection relationship determined by the port connection determination unit 1175 .
- FIG. 25 is a diagram showing the configuration of the subscriber device 1520. As shown in FIG. The subscriber unit 1520 shown in FIG. 26 differs from the subscriber unit 1120 of the ninth embodiment shown in FIG.
- the dispersion compensator 1521 performs dispersion compensation in the electrical stage.
- the dispersion compensator 1521 is a time domain equalizer (TDE) or frequency domain equalizer (FDE) implemented using digital signal processing (DSP). Both TDE and FDE implement dispersion compensation by using an equalization coefficient obtained from the transfer function of chromatic dispersion.
- TDE time domain equalizer
- FDE frequency domain equalizer
- DSP digital signal processing
- FIG. 26 is a sequence diagram showing the operation of setting the dispersion compensation function of the optical communication system 1510.
- FIG. In the figure, the same reference numerals are assigned to the same operations as those of the optical communication system 1110 of the ninth embodiment shown in FIG. 16, and detailed description thereof will be omitted.
- the optical communication system 1510 performs the same processing as steps S1101 to S1107 in FIG. That is, the optical communication system 1510 connects the input port and the output port of each of the optical SW 130a and the optical SW 130b so that an optical path is set between the subscriber unit 1520a-1 and the subscriber unit 1520b-1.
- Subscriber unit 1520a-1 transmits message M1 in the AMCC signal.
- Subscriber unit 1520b-1 receives message M1 and transmits message M2 of the AMCC signal.
- transmission distance measuring section 1127 of subscriber device 1520a-1 calculates the transmission distance between subscriber device 1520a-1 and subscriber device 1520b-1.
- the transmission distance measurement unit 1127 of the subscriber unit 1520a-1 transmits transmission distance information indicating the calculated transmission distance to the management control unit 1570, and notifies the transmission distance information to the dispersion compensation unit 1521 of the electrical stage.
- the notification unit 1572 of the management control device 1570 notifies the received transmission distance information to the dispersion compensation unit 1521 of the electrical stage of the subscriber device 1520b-1 (step S1501).
- the dispersion compensating unit 1521 of the subscriber unit 1520a-1 and the dispersion compensating unit 1521 of the subscriber unit 1520b-1 set equalization coefficients so that the amount of dispersion compensation required for the received transmission distance information (step S1502, step S1503).
- the setting of the dispersion compensator 1521 of the subscriber device 1520a-1 and the dispersion compensator 1521 of the subscriber device 1520b-1 is completed, the main signal is transmitted between the subscriber device 1520a-1 and the subscriber device 1520b-1. Transmission/reception is started (step S1504).
- the transmission distance can be calculated by the RTT measurement using the low-speed management control signal without lowering the throughput of the main signal.
- the optical communication system starts high-speed main signal communication after setting the dispersion compensator of the electrical stage according to the transmission distance. This makes it possible to obtain desired reception sensitivity for high-speed main signals.
- the thirteenth embodiment compensates for the quality of the transmission line between the subscriber unit and the optical SW. This embodiment will be described with a focus on differences from the above-described embodiment.
- FIG. 27 is a diagram showing the configuration of an optical communication system 1610 according to the thirteenth embodiment.
- the optical communication system 1610 shown in FIG. 27 differs from the optical communication system 1110 shown in FIG. and that the optical SW 130 b is connected to the dispersion compensator 160 .
- Each of the optical SW 130a and the optical SW 130b is connected to a plurality of types of dispersion compensators 160, respectively.
- the two dispersion compensators 160 connected to the optical SW 130b are referred to as dispersion compensators 160-3 and 160-4.
- the optical transmission line 1650-n has a chromatic dispersion compensating function that makes the accumulated chromatic dispersion value zero, there is no need for dispersion compensation.
- the management control unit 1171 knows in advance the transmission line length of the optical transmission line 1650-n.
- the management control device 1670 has one or more control transceivers 1680 and a management control unit 1171 .
- the control transceivers 1680 are each connected to the output port 132 of the optical SW 130 .
- a subscriber unit 1120 connects to a control transceiver 1680 before initiating communication with an opposite subscriber unit 1120 .
- Control transmitter/receiver 1680 transmits/receives AMCC signals to/from subscriber unit 1120 and measures the transmission path length between subscriber unit 1120 and optical SW 130 .
- the control transmitter/receiver 1680 includes an optical transmitter 1681 , an optical multiplexer/demultiplexer 1682 , an optical receiver 1683 , and a transmission distance measuring unit 1684 .
- Optical transmitter 1681, optical multiplexer/demultiplexer 1682, optical receiver 1683, and transmission distance measurement unit 1684 are optical transmitter 1122, optical multiplexer/demultiplexer 1123, optical receiver 1124, and transmission distance measurement unit 1127 of subscriber unit 1120, respectively. has the same function as
- the control transmitter/receiver 1680 connected to the output port 132 of the optical SW 130x is referred to as a control transmitter/receiver 1680x.
- the distance measurement units 1684 are respectively referred to as an optical transmission unit 1681x, an optical multiplexing/demultiplexing unit 1682x, an optical reception unit 1683x, and a transmission distance measurement unit 1684x.
- FIG. 28 is a sequence diagram showing the operation of selecting the dispersion compensator of the optical communication system 1610.
- the optical SW 130x outputs the optical signal of the reception wavelength of the subscriber unit 1120x-1 input from the output port 132 connected to the control transmitter/receiver 1680x to the input port 131 connected to the subscriber unit 1120x-1.
- a port connection relationship is set.
- the optical SW 130x receives an optical signal of the transmission wavelength of the subscriber unit 1120x-1 input from the input port 131 to which the subscriber unit 1120x-1 is connected, and outputs it to the output port 132 connected to the control transmitter/receiver 1680x.
- a port connection relationship for output to is set.
- steps S1102 to S1106 shown in FIG. 16 The same processing as steps S1102 to S1106 shown in FIG. 16 is performed between the control transmitter/receiver 1680x and the subscriber device 1120x-1. That is, the control signal output by the transmission distance measuring unit 1684x of the control transceiver 1680x is superimposed as an AMCC signal on the optical signal of the reception wavelength of the subscriber unit 1120x-1 by the optical transmitting unit 1681x.
- Optical SW 130x outputs message M1 transmitted from control transmitter/receiver 1680x to subscriber unit 1120x-1.
- the subscriber device 1120x-1 receives the AMCC signal superimposed on the message M1 (step S1702).
- the subscriber unit 1120x-1 transmits a message M2 with an AMCC signal (step S1703).
- Optical SW 130x outputs message M2 sent from subscriber unit 1120x-1 to control transmitter/receiver 1680x.
- the optical multiplexer/demultiplexer 1682x of the control transceiver 1680x outputs the received message M2 to the optical receiver 1683x.
- the optical receiver 1683x converts the message M2 from an optical signal to an electrical signal.
- the transmission distance measurement unit 1684x receives the AMCC signal superimposed on the electrical signal message M2 (step S1704).
- the transmission distance measurement unit 1684x of the control transceiver 1680x uses the received AMCC signal to calculate the RTT between the subscriber unit 1120x-1 and the control transceiver 1680x, as in the ninth embodiment. .
- the transmission distance measurement unit 1684x outputs RTT information indicating the calculated RTT to the management control unit 1171 (step S1705).
- the selection unit 1174 of the management control unit 1171 uses the RTT indicated by the RTT information to calculate the transmission distance between the subscriber unit 1120x-1 and the control transmitter/receiver 1680x. If the distance between the control transceiver 1680x and the optical SW 130x is short, the selector 1174 sets the calculated transmission distance as the distance between the subscriber unit 1120x-1 and the optical SW 130x (step S1706).
- the selection unit 1174 of the management control unit 1171 calculates the amount of dispersion compensation necessary for the transmission distance and determines the dispersion compensation unit 160 to be used (step S1707), as in the ninth embodiment.
- the port connection determining unit 1175 is configured so that the optical signal from the subscriber unit 1120x-1 to the communication destination subscriber unit 1120x′-1 passes through the dispersion compensator 160 selected by the selector 1174 in the optical SW 130x.
- the notification unit 1176 notifies the optical SW 130x of the port connection relationship of the optical SW 130x determined by the selection unit 1174 (step S1708).
- the optical SW 130x connects the input port 131 and the output port 132 according to the port connection relation notified in step S1708 (step S1709).
- FIG. 29 is a flowchart showing processing up to main signal conduction between the subscriber device 1120a-1 and the subscriber device 1120b-1 of the optical communication system 1610.
- the optical communication system 1610 uses the sequence shown in FIG. 28 to select the dispersion compensator 160 for achieving dispersion compensation between the subscriber unit 1120a-1 and the optical SW 130a (step S1801).
- the optical communication system 1610 uses the sequence shown in FIG. 28 to select the dispersion compensator 160 for achieving dispersion compensation between the subscriber unit 1120b-1 and the optical SW 130b (step S1802).
- optical communication system 1610 initiates primary signal communication between subscriber unit 1120a-1 and subscriber unit 1120b-1.
- FIG. 30 is a device configuration diagram showing an example of the hardware configuration of the management control device 170.
- the management control device 170 includes a processor 71 , a storage section 72 , a communication interface 73 and a user interface 74 .
- the processor 71 is a central processing unit that performs calculations and controls.
- Processor 71 is, for example, a CPU.
- the processor 71 implements the functions of the management control unit 171 by reading out and executing programs from the storage unit 72 .
- the storage unit 72 further has a work area and the like used when the processor 71 executes various programs.
- the communication interface 73 is for communicably connecting with other devices.
- the user interface 74 is an input device such as a keyboard, pointing device (mouse, tablet, etc.), buttons, touch panel, etc., and a display device such as a display.
- a user interface 74 is used to input an artificial operation.
- All or part of the functions of the management control device 170 may be realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array).
- ASIC Application Specific Integrated Circuit
- PLD Process-Demand Device
- FPGA Field Programmable Gate Array
- the hardware configuration examples of the management control unit 1171 of the management control device 1170, the management control unit 1571 of the management control device 1570, and the management control unit 1171 of the management control device 1670 are the same as in FIG.
- the processor 71 reads out and executes a program from the storage unit 72 to operate the management control unit 1171 of the management control device 1170, the management control unit 1571 of the management control device 1570, and the management control unit 1171 of the management control device 1670. Realize the function.
- a parameter table in which information of the quality compensator corresponding to the signal parameter value is set is prepared in advance for each combination of incoming and outgoing subscriber units.
- the optical communication system selects a quality compensator based on this parameter table. Therefore, it is possible to perform quality compensation that flexibly copes with a plurality of types of transmission line conditions.
- Quality compensation is performed by one or both of dispersion compensation and optical amplification. For example, it is suitable when applied to APNs with different permissible dispersion values and losses for each subscriber device.
- the transmission distance can be calculated by the RTT measurement using the low-speed management control signal without lowering the throughput of the main signal.
- the transmission distance can be calculated by starting communication of the high-speed main signal after selecting the dispersion compensator and the optical amplifier according to the calculated transmission distance, it is possible to obtain the desired reception sensitivity for the high-speed main signal.
- the optical communication system includes an optical switch, a plurality of quality compensators, and a controller.
- An optical switch has multiple ports.
- An optical switch outputs an optical signal input from one port from another port.
- the quality compensator compensates for the quality of the optical signal output from the optical switch, and inputs the quality-compensated optical signal to the optical switch.
- the control section has a selection section and an instruction section.
- a control unit corresponds to the management control units 171, 1171, and 1571 of the embodiments.
- the selection unit performs quality compensation according to the degree of quality deterioration of the optical signal input from a predetermined port of the optical switch when the optical signal is transmitted through the transmission line among the plurality of quality compensation units. select the part.
- the instruction unit outputs an optical signal input from a predetermined port to the quality compensation unit selected by the selection unit, and transmits the optical signal whose quality has been compensated by the selected quality compensation unit to the transmission destination of the optical signal.
- the optical switch is instructed to output from the corresponding port.
- An instruction unit corresponds to the port connection determination unit 175 and notification unit 176, the port connection determination unit 1175 and notification unit 1176, and the port connection determination unit 1175 and notification unit 1572 of the embodiments.
- the control unit may further include an allocation unit that allocates wavelengths and transmission paths used for optical signals from the subscriber device to the destination in response to a request from the subscriber device.
- the selection unit performs compensation according to the degree of quality deterioration of the optical signal when the optical signal of the assigned wavelength is transmitted through the assigned transmission line among the plurality of quality compensation units connected to the optical switch. Select compensator.
- the instruction unit outputs the optical signal of the assigned wavelength input from the port connected to the subscriber unit to the quality compensation unit selected by the selection unit.
- the instructing unit instructs the optical switch to output the optical signal whose quality has been compensated by the selected quality compensating unit from the port connected to the transmission line assigned by the assigning unit.
- the selection unit performs quality compensation according to the degree of quality deterioration allowed for an optical signal input from a port connected to a subscriber device among a plurality of quality compensation units connected to an optical switch.
- Select the quality compensator The degree of quality degradation allowed for an optical signal is one of the resource used for transmission of the optical signal and the value of the signal parameter used in the optical signal transmission apparatus to control the characteristics of the optical signal, or It supports both.
- the resources are the optical transmission line 150, wavelengths, devices for relaying optical signals, and the like. Devices that relay optical signals are, for example, the optical SW 130, the wavelength multiplexing/demultiplexing unit 140, and the like.
- the optical signal transmitter is, for example, the subscriber unit 120 .
- the characteristics of the optical signal are, for example, modulation scheme, baud rate, and optical intensity.
- the quality compensator performs one or both of compensation for dispersion of the optical signal and amplification of the optical signal.
- the degree of quality deterioration of an optical signal when the optical signal is transmitted through a transmission line corresponds to the length of the transmission line.
- the instruction unit selects, from among the plurality of quality compensators, a quality compensator that compensates for the quality of the optical signal, based on the length of the transmission path through which the optical signal input from the predetermined port of the optical switch is transmitted. .
- the length of the transmission path is estimated based on round-trip times measured by transmitting and receiving optical signals over the transmission path between the subscriber unit and the device with which it communicates.
- the optical signal used for round-trip time measurement is, for example, a control signal that is superimposed on the main signal and is slower than the main signal.
- the instruction unit selects a plurality of candidates for the quality compensator for compensating the quality of the optical signal based on the length of the transmission path through which the optical signal input from the predetermined port of the optical switch is transmitted, from among the plurality of quality compensators.
- a quality compensator may be selected from a plurality of candidates to compensate for the quality of the optical signal.
- the instruction unit selects an unselected quality compensator from among the plurality of candidates when the quality of the optical signal compensated by the selected quality compensator is lower than a predetermined quality.
- the selection unit may select two or more quality compensation units for quality compensation from among the plurality of quality compensation units.
- the instruction unit sequentially outputs the optical signal input from the predetermined port to the selected quality compensator, and transmits the optical signal whose quality has been compensated by all the selected quality compensators to the transmission destination of the optical signal. Control the optical switch to output from the corresponding port.
- Optical Communication System 120a-1 Subscriber Device 120a-2 Subscriber Device 120b-1 Subscriber Device 120b-2 Subscriber Device 131 Input Port 132 Output Port 140a-1 Wavelength Combiner Demultiplexer 140a-2 Wavelength multiplexer/demultiplexer 140b-1 Wavelength multiplexer/demultiplexer 140b-2 Wavelength multiplexer/demultiplexer 150-1 Optical transmission line 150-2 Optical transmission line 160-1 Dispersion compensator 160-2 Dispersion compensation Section 160-3 Dispersion Compensation Section 160-4 Dispersion Compensation Section 170 Management Control Device 171 Management Control Section 172 Storage Section 173 Allocation Section 174 Selection Section 175 Port Connection Determination Section 176 Notification Section 210 Optical Communication System 280a Wavelength Separation Filter 280b Wavelength Separation Filter 310 Optical communication system 380a Wavelength separation filter 380b Wavelength separation filter 410 Optical communication system 440a-1-1 Wavelength multiplexing/demultiplexing unit
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Abstract
Description
図1は、第1の実施形態による光通信システム110の構成を示す図である。光通信システム110は、加入者装置120と、光SW130と、波長合分波部140と、光伝送路150と、分散補償部160と、管理制御装置170とを有する。加入者装置120、光SW130、波長合分波部140及び光伝送路150としてそれぞれ、図33に示す加入者装置920、光SW930、波長合分波部940及び光伝送路950を用いることができる。
第1の実施形態においては、図1における加入者装置120aから加入者装置120bへの光信号が分散補償部160を経由している。本実施形態では、加入者装置120bから加入者装置120bへの光信号も分散補償部160を経由する。本実施形態を、第1の実施形態との差分を中心に説明する。
第2の実施形態の光通信システムは、光送信を行う加入者装置に最も近い光SWが分散補償を行う。しかし、この構成に関わらず、例えば、加入者装置が出力した光信号の分散補償を、その加入者装置と接続されている光SWとは異なる光SWに接続されている分散補償部が行ってもよい。本実施形態を、第1及び第2の実施形態との差分を中心に説明する。
本実施形態では、光SWと分散補償部との間に波長合分波部を挿入する。これにより、本実施形態の光通信システムは、異なる波長の光信号に対して一括して分散補償を行う。本実施形態を、第1の実施形態との差分を中心に説明する。
第1の実施形態においては、品質補償部として分散補償部を用いていた。第5の実施形態においては、品質補償部として光増幅部を用いる。本実施形態を、第1の実施形態との差分を中心に説明する。
本実施形態では、光SWと光増幅部との間に波長合分波部を挿入する。これにより、本実施形態の光通信システムは、異なる波長の光信号に対して一括して増幅を行う。本実施形態を、上述の実施形態との差分を中心に説明する。
本実施形態の光通信システムは、分散量が異なる複数の分散補償部と、利得が異なる複数の光増幅部とを有する。本実施形態を、上述した実施形態との差分を中心に説明する。
本実施形態の光通信システムは、分散補償部と光増幅部とを含む品質補償部を複数有する。本実施形態を、上述した実施形態との差分を中心に説明する。
光パスをエンド・ツー・エンドで提供するAPNにおいては、通信相手の加入者装置が動的に変化することが想定される。累積波長分散を補償するためには、対向加入者装置間の距離を測定する必要がある。従来手法として、図37に示す従来技術のように、送信側の加入者装置が、データとPSを含む信号フレームを作成し、受信側の加入者装置が、PSのスペクトル間の遅延時間差を計算することで波長分散の値を推定する方法がある。しかし、信号にPSを挿入する必要があるため、主信号のスループットが低下する。
第9の実施形態においては、品質補償部として分散補償部を用いていた。第10の実施形態においては、品質補償部として光増幅部を用いる点を除き。第9の実施形態と同様の処理を行う。本実施形態を、第9の実施形態との差分を中心に説明する。
本実施形態の光通信システムは、分散量が異なる複数の分散補償部と、利得が異なる複数の光増幅部とを有する。本実施形態を、第9及び第10の実施形態との差分を中心に説明する。
第12の実施形態では、加入者装置に分散補償部を備える。本実施形態を、上述した第9~第11の実施形態との差分を中心に説明する。
第13の実施形態では、加入者装置と光SWとの間の伝送路の品質を補償する。本実施形態を、上述した実施形態との差分を中心に説明する。
72 記憶部
73 通信インタフェース
74 ユーザインタフェース
110 光通信システム
120a-1 加入者装置
120a-2 加入者装置
120b-1 加入者装置
120b-2 加入者装置
131 入力ポート
132 出力ポート
140a-1 波長合分波部
140a-2 波長合分波部
140b-1 波長合分波部
140b-2 波長合分波部
150-1 光伝送路
150-2 光伝送路
160-1 分散補償部
160-2 分散補償部
160-3 分散補償部
160-4 分散補償部
170 管理制御装置
171 管理制御部
172 記憶部
173 割当部
174 選択部
175 ポート接続決定部
176 通知部
210 光通信システム
280a 波長分離フィルタ
280b 波長分離フィルタ
310 光通信システム
380a 波長分離フィルタ
380b 波長分離フィルタ
410 光通信システム
440a-1-1 波長合分波部
440a-1-2 波長合分波部
440a-2-1 波長合分波部
440a-2-2 波長合分波部
510 光通信システム
560-1 光増幅部
560-2 光増幅部
610 光通信システム
710 光通信システム
810 光通信システム
860-1 品質補償部
860-2 品質補償部
910 光通信システム
920a-1 加入者装置
920a-2 加入者装置
920b-1 加入者装置
920b-2 加入者装置
921 光送信部
922 光受信部
923 光合分波部
924 管理制御部
931 入力ポート
932 出力ポート
940a-1 波長合分波部
940a-2 波長合分波部
940b-1 波長合分波部
940b-2 波長合分波部
950-1 光伝送路
950-2 光伝送路
970 管理制御装置
980a トランシーバ
980b トランシーバ
981a 送信器
981b 送信器
982a 受信器
982b 受信器
983-1 ファイバ
983-2 ファイバ
1110 光通信システム
1111 光通信システム
1120 加入者装置
1120a-1 加入者装置
1120a-2 加入者装置
1120b-1 加入者装置
1120b-2 加入者装置
1121 信号ミキサ
1122 光送信部
1123 光合分波部
1124 光受信部
1125 信号デバイダ
1126 管理制御部
1127 伝送距離測定部
1170 管理制御装置
1171 管理制御部
1172 記憶部
1173 割当部
1174 選択部
1175 ポート接続決定部
1176 通知部
1180 制御信号抜出装置
1180a-1 制御信号抜出装置
1180a-2 制御信号抜出装置
1180b-1 制御信号抜出装置
1180b-2 制御信号抜出装置
1181 光分岐部
1182 波長合分波部
1183 制御用受信器
1184-1~1184-3 光受信器
1185-1~1185-3 分離部
1190 制御信号用通信路
1210 光通信システム
1310 光通信システム
1510 光通信システム
1520 加入者装置
1520a-1 加入者装置
1520a-2 加入者装置
1520b-1 加入者装置
1520b-2 加入者装置
1521 分散補償部
1570 管理制御装置
1571 管理制御部
1572 通知部
1610 光通信システム
1650-1 光伝送路
1650-2 光伝送路
1670 管理制御装置
1680a 制御用送受信器
1680b 制御用送受信器
1681a 光送信部
1681b 光送信部
1682a 光合分波部
1682b 光合分波部
1683a 光受信部
1683b 光受信部
1684a 伝送距離測定部
1684b 伝送距離測定部
Claims (12)
- 複数のポートを有し、いずれかの前記ポートから入力した光信号を他の前記ポートから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品質を補償し、品質を補償した前記光信号を前記光スイッチに入力する複数の品質補償部と、
複数の前記品質補償部のうち、前記光スイッチの所定のポートから入力される光信号が伝送路を伝送する際の前記光信号の品質劣化の程度に応じた品質の補償を行う品質補償部を選択する処理と、前記所定のポートから入力される光信号を選択された前記品質補償部に出力し、選択された前記品質補償部により品質が補償された光信号を、当該光信号の送信先に応じたポートから出力するよう前記光スイッチを制御する処理とを行う制御部と、
を備える光通信システム。 - 複数のポートのいずれかの前記ポートから入力した光信号を他の前記ポートから出力する光スイッチと接続される複数の品質補償部のうち、前記光スイッチの所定のポートから入力される光信号が伝送路を伝送する際の前記光信号の品質劣化の程度に応じた品質の補償を行う品質補償部を選択する選択部と、
前記所定のポートから入力される光信号を選択された前記品質補償部に出力し、選択された前記品質補償部により品質が補償された光信号を、当該光信号の送信先に応じたポートから出力するよう前記光スイッチに指示する指示部と、
を備える制御装置。 - 加入者装置からの要求に応じて前記加入者装置から前記送信先への光信号に用いられる波長及び伝送路を割り当てる割当部をさらに備え、
前記選択部は、複数の前記品質補償部のうち、前記割当部により割り当てられた前記波長の前記光信号が前記割当部により割り当てられた前記伝送路を伝送する際の前記光信号の品質劣化の程度に応じた補償を行う前記品質補償部を選択し、
前記指示部は、前記加入者装置と接続される前記ポートから入力される前記波長の光信号を前記選択部により選択された前記品質補償部に出力し、選択された前記品質補償部により品質が補償された光信号を前記割当部が割り当てた前記伝送路と接続される前記ポートから出力するよう前記光スイッチに指示する、
請求項2に記載の制御装置。 - 前記選択部は、複数の前記品質補償部のうち、前記加入者装置と接続される前記ポートから入力される前記光信号に許容される品質劣化の程度に応じた品質の補償を行う品質補償部を選択し、
前記光信号に許容される品質劣化の程度は、当該光信号の伝送に使用されるリソースと、当該光信号の特性を制御するために光信号の送信装置において用いられる信号パラメータの値との一方又は両方に対応する、
請求項3に記載の制御装置。 - 前記リソースは、前記光信号が伝送する伝送路と、前記光信号を中継する装置との一方又は両方である、
請求項4に記載の制御装置。 - 前記光信号が伝送路を伝送する際の前記光信号の品質劣化の程度は前記伝送路の長さに対応し、
前記指示部は、複数の前記品質補償部のうち、前記光スイッチの前記所定のポートから入力される光信号が伝送する前記伝送路の長さに基づいて前記光信号の品質の補償を行う品質補償部を選択し、
前記伝送路の長さは、加入者装置と前記送信先との間で前記伝送路を介して光信号を送受信することにより測定されたラウンドトリップタイムに基づき推定される、
請求項2に記載の制御装置。 - 前記ラウンドトリップタイムの測定に用いられる前記光信号は、主信号に重畳され、かつ、前記主信号よりも低速な制御信号である、
請求項6に記載の制御装置。 - 前記指示部は、複数の前記品質補償部のうち、前記光スイッチの前記所定のポートから入力される光信号が伝送する前記伝送路の長さに基づいて前記光信号の品質の補償を行う品質補償部の候補を複数選択し、複数の前記候補のうち前記光信号の品質の補償を行う品質補償部を選択し、選択した前記品質補償部により補償された前記光信号の品質が所定よりも低い場合に、複数の前記候補のうち未選択の前記品質補償部を選択する、
請求項6又は請求項7に記載の制御装置。 - 前記選択部は、複数の前記品質補償部のうち、品質の補償を行うための2以上の品質補償部を選択し、
前記指示部は、前記所定のポートから入力される光信号を選択された前記品質補償部に順に出力し、選択された全ての前記品質補償部により品質が補償された光信号を、当該光信号の送信先に応じたポートから出力するよう前記光スイッチを制御する、
請求項2から請求項8のいずれか一項に記載の制御装置。 - 前記品質補償部は、光信号の分散の補償と、光信号の増幅との一方又は両方を行う、
請求項2から請求項9のいずれか一項に記載の制御装置。 - 複数のポートを有する光スイッチが、いずれかの前記ポートから入力した光信号を他の前記ポートから出力する転送ステップと、
品質補償部が、前記光スイッチから出力された光信号の品質を補償し、品質を補償した前記光信号を前記光スイッチに入力する品質補償ステップと、
制御部が、前記光スイッチに接続される複数の前記品質補償部のうち、前記光スイッチの所定のポートから入力される光信号が伝送路を伝送する際の前記光信号の品質劣化の程度に応じた品質の補償を行う品質補償部を選択する処理と、前記所定のポートから入力される光信号を選択された前記品質補償部に出力し、選択された前記品質補償部により品質が補償された光信号を、当該光信号の送信先に応じたポートから出力するよう前記光スイッチを制御する処理とを行う制御ステップと、
を有する品質補償方法。 - 複数のポートのいずれかの前記ポートから入力した光信号を他の前記ポートから出力する光スイッチと接続される複数の品質補償部のうち、前記光スイッチの所定のポートから入力される光信号が伝送路を伝送する際の前記光信号の品質の補償を行う品質補償部を選択する選択ステップと、
前記所定のポートから入力される光信号を選択された前記品質補償部に出力し、選択された前記品質補償部により品質が補償された光信号を、当該光信号の送信先に応じたポートから出力するよう前記光スイッチに指示する指示ステップと、
を有する品質補償方法。
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