WO2014104355A1 - Optical transmission system - Google Patents

Optical transmission system Download PDF

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Publication number
WO2014104355A1
WO2014104355A1 PCT/JP2013/085239 JP2013085239W WO2014104355A1 WO 2014104355 A1 WO2014104355 A1 WO 2014104355A1 JP 2013085239 W JP2013085239 W JP 2013085239W WO 2014104355 A1 WO2014104355 A1 WO 2014104355A1
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WO
WIPO (PCT)
Prior art keywords
optical transmission
optical
transmission device
amplifier
post
Prior art date
Application number
PCT/JP2013/085239
Other languages
French (fr)
Japanese (ja)
Inventor
鈴木　幹哉
Original Assignee
古河電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 古河電気工業株式会社 filed Critical 古河電気工業株式会社
Priority to JP2014554619A priority Critical patent/JPWO2014104355A1/en
Publication of WO2014104355A1 publication Critical patent/WO2014104355A1/en

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Classifications

    • 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
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25751—Optical arrangements for CATV or video distribution
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
    • H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements

Definitions

  • the present invention relates to an optical transmission system.
  • an optical amplifier as an optical transmission apparatus has a multi-port output configuration by connecting a plurality of optical distributors to the output side of one high output optical amplifier.
  • the failure may spread to a large number of subscribers connected to all output ports. Therefore, there are cases where a plurality of optical amplifiers are used in order to keep the fault spillover range as narrow as possible. (See Patent Document 1).
  • FIG. 6 is a schematic configuration diagram of an example of an optical transmission system in which a plurality of optical amplifiers are arranged on an optical transmission line branched by an optical distributor.
  • N is an integer equal to or larger than 2
  • a front optical amplifier 1020 and N rear optical amplifiers 1040-1 to 1040 are placed on an optical transmission path branched by a 1 ⁇ N optical distributor 1030.
  • -N is arranged.
  • the pre-amplifier 1020 includes a pre-amplifier 1021 that is an optical amplifier, and a pre-amplifier control circuit 1022 that is a controller that controls the operation of the pre-amplifier 1020.
  • the preamplifier control circuit 1022 stores information data D1001 (indicated by #A) used to control the operation of the preamplifier 1020.
  • the rear optical amplifiers 1040-1 to 1040-N control the operations of the rear amplifying units 1041-1 to 1041-N and the rear optical amplifiers 1040-1 to 1040-N, which are optical amplifying units, respectively.
  • post-amplifier control circuits 1042-1 to 1042-N are information data D1002-1 to D1002-N used for controlling the operations of the post-optical amplifiers 1040-1 to 1040-N, respectively. (Indicated by # 1 to #N) are stored.
  • one port side is connected to the optical output port of the front optical amplifier 1020, and the N port side is connected to each optical input port of the rear optical amplifiers 1040-1 to 1040-N. Connected via -N.
  • the pre-amplifier 1020 When signal light is input from the optical input port 1010 to the optical input port of the pre-amplifier 1020, the pre-amplifier 1020 amplifies the signal light and outputs it to the optical distributor 1030.
  • the optical distributor 1030 divides the inputted signal light into N equal parts and outputs it to each of the rear optical amplifiers 1040-1 to 1040 -N.
  • the rear optical amplifiers 1040-1 to 1040-N amplify the input signal light and output the amplified signal light to the optical output ports 1050-1 to 1050-N, respectively. Each signal light output from the optical output ports 1050-1 to 1050-N is distributed to the subscribers.
  • the failed optical amplifier is replaced with a spare optical amplifier. Since the control circuit of each optical amplifier stores data used to control the optical amplifier, after being replaced, the control circuit operates in an operation state based on the stored data.
  • the required characteristics for example, the optical amplification characteristics are different for each optical amplifier because the distance from the optical output ports 1050-1 to 1050-N to the subscriber may be different for each port. Therefore, when replacement is performed due to a failure, it is necessary to prepare a spare optical amplifier for each optical amplifier having different characteristics, so that the types of optical amplifiers to be prepared increase and management becomes complicated.
  • a general-purpose optical amplifier is used in combination with a device for adjusting amplification characteristics such as an optical attenuator.
  • a device for adjusting amplification characteristics such as an optical attenuator.
  • the present invention has been made in view of the above, and provides an optical transmission system suitable for exchanging an optical amplifier in an optical transmission system in which a plurality of optical amplifiers are arranged on a branched optical transmission line. For the purpose.
  • an optical transmission system includes a plurality of optical transmission devices configured to be replaceable on a branched optical transmission path, and the plurality of optical transmissions.
  • the apparatus includes a first optical transmission apparatus and a second optical transmission apparatus, and the first optical transmission apparatus includes a first control unit that controls an operation of the first optical transmission apparatus, and the second optical transmission apparatus
  • the apparatus includes a second control unit that controls the operation of the second optical transmission device, and the second control unit includes a reference used by the first control unit to control the first optical transmission device. Is stored, and is configured to communicate with the first control unit and transmit the data to the first control unit.
  • the second control unit transmits the data in accordance with a request from the first control unit.
  • the plurality of optical transmission devices include a rear optical transmission device and a front light positioned above the rear optical transmission device on the optical transmission path.
  • the first optical transmission device is the rear optical transmission device
  • the second optical transmission device is the front optical transmission device.
  • the plurality of optical transmission devices include a rear optical transmission device and a front light positioned above the rear optical transmission device on the optical transmission path.
  • the first optical transmission device is the front optical transmission device
  • the second optical transmission device is the rear optical transmission device.
  • the plurality of optical transmission devices are positioned higher than the plurality of rear optical transmission devices on the optical transmission path.
  • the first optical transmission device and the second optical transmission device are included in the plurality of rear optical transmission devices.
  • the plurality of optical transmission devices are positioned higher than the plurality of rear optical transmission devices on the optical transmission path.
  • a first optical transmission device the first optical transmission device being the higher optical transmission device, and the second optical transmission.
  • the apparatus is the front optical transmission apparatus or the rear optical transmission apparatus.
  • the reference information is associated with the static characteristic, dynamic characteristic, alarm condition, or specific information information of the first optical transmission apparatus. And positional information for specifying the first optical transmission device.
  • the optical transmission system according to the present invention is characterized in that, in the above invention, the plurality of optical transmission devices include optical amplifiers.
  • FIG. 1 is a schematic configuration diagram of an optical transmission system according to the first embodiment.
  • FIG. 2 is a schematic configuration diagram of the front optical amplifier.
  • FIG. 3 is a schematic configuration diagram of the optical transmission system according to the second embodiment.
  • FIG. 4 is a schematic configuration diagram of the optical transmission system according to the third embodiment.
  • FIG. 5 is a schematic configuration diagram of an optical transmission system according to the fourth embodiment.
  • FIG. 6 is a schematic configuration diagram of an example of an optical transmission system in which a plurality of optical amplifiers are arranged on an optical transmission line branched using an optical distributor.
  • FIG. 1 is a schematic configuration diagram of an optical transmission system according to Embodiment 1 of the present invention.
  • a pre-optical amplifier 20 as an optical transmission device
  • N post-optical amplifiers 40-1 as optical transmission devices on an optical transmission path branched by a 1 ⁇ N optical distributor 30.
  • ⁇ 40-N are arranged.
  • the pre-amplifier 20 includes a pre-amplifier 21 that is an optical amplifier and a pre-amplifier control circuit 22 that is a controller that controls the operation of the pre-amplifier 20.
  • the post-optical amplifiers 40-1 to 40-N control the operations of the post-amplifiers 41-1 to 41-N, which are optical amplifiers, and the post-optical amplifiers 40-1 to 40-N, respectively. And post-amplifier control circuits 42-1 to 42-N.
  • the optical distributor 30 has one port connected to the optical output port of the front optical amplifier 20, and the N port side connected to each optical input port of the rear optical amplifiers 40-1 to 40-N. Connected via -N.
  • the optical input port of the front optical amplifier 20 is connected to the optical input port 10, and the optical output ports of the rear optical amplifiers 40-1 to 40-N are connected to the optical output ports 50-1 to 50-N, respectively. ing.
  • the preamplifier control circuit 22 of the pre-amplifier 20 is connected to the post-amplifiers 40-1 to 40-N via the electrical signal transmission line EL1 and the electrical connectors 70-1 to 70-N. Each of the preamplifier control circuits 42-1 to 42-N is connected.
  • FIG. 2 is a schematic configuration diagram of the front optical amplifier.
  • Each of the rear optical amplifiers 40-1 to 40-N can have the same configuration as that shown in FIG. Further, the front optical amplifier 20 and the rear optical amplifiers 40-1 to 40-N are configured to be replaceable with spare optical amplifiers when a failure occurs.
  • the preamplifier 21 is connected to an optical coupler 21a, a photodetector 21b connected to the optical coupler 21a, a wavelength poly-multiplexing demultiplexing coupler 21c connected to the optical coupler 21a, and a wavelength poly-multiplexing demultiplexing coupler 21c.
  • a pumping laser element 21d, an amplifying optical fiber 21e connected to the wavelength multiple polymerization demultiplexing coupler 21c, an optical coupler 21f connected to the amplifying optical fiber 21e, and a photodetector 21g connected to the optical coupler 21f are provided. Yes.
  • the optical couplers 21a and 21f branch a part of the input light (for example, 1% to 10%), and are, for example, fused or filter type optical couplers.
  • the photodetectors 21b and 21g receive light and output a current having a value corresponding to the received light intensity, and are, for example, photodiodes.
  • the pump laser element 21d outputs pump laser light for pumping the amplification optical fiber 21e, and is, for example, a semiconductor laser element.
  • the wavelength multi-polymerization demultiplexing coupler 21c combines the light input from the optical coupler 21a and the pumping laser light output from the pumping laser element 21d and outputs them to the amplification optical fiber 21e. This is a filter type optical coupler.
  • the amplification optical fiber 21e is an optical fiber in which a rare earth element such as erbium or ytterbium, which is an optical amplification medium, is added to the core, and has an optical amplification function.
  • a rare earth element such as erbium or ytterbium
  • a double clad optical fiber may be used.
  • the preamplifier control circuit 22 includes a digital / analog converter 22a, an analog / digital converter 22b, an arithmetic processor 22c, a storage unit 22d, and an input / output unit 22e.
  • the digital / analog converter 22a converts a digital electric signal into an analog electric signal.
  • the analog / digital converter 22b converts an analog electric signal into a digital electric signal.
  • the arithmetic processing unit 22c performs various arithmetic processes for controlling the pre-amplifier 20, and is composed of, for example, a CPU (Central Processing Unit).
  • the storage unit 22d is used as a part for storing various programs and data (firmware and the like) used by the arithmetic processing unit 22c to perform arithmetic processing, and as a work space when the arithmetic processing unit 22c performs arithmetic processing.
  • it is composed of a ROM (Read Only Memory) and a RAM (Random Access Memory).
  • the input / output unit 22e inputs / outputs electric signals to / from other control circuits via the electric signal transmission line EL1 (see FIG. 1), and inputs / outputs electric signals to / from an external personal computer PC. is there.
  • the input / output unit 22e is, for example, an RS232C port or an Ethernet (registered trademark) port.
  • the optical coupler 21a allows the signal light to pass and branches a part thereof to the photodetector 21b side.
  • the pump laser element 21d is supplied with a drive current controlled by the preamplifier control circuit 22 and outputs pump laser light.
  • the wavelength multi-polymerization demultiplexing coupler 21c combines the signal light input from the optical coupler 21a and the pump laser light output from the pump laser element 21d, and outputs the combined light to the amplification optical fiber 21e.
  • the rare earth element is optically excited by the excitation laser light and has an optical amplification function, whereby the signal light is laser amplified and output.
  • the optical coupler 21f passes and outputs the amplified signal light and branches a part thereof to the photodetector 21g side.
  • the photodetector 21b receives the signal light branched from the optical coupler 21a to the photodetector 21b, and outputs a current having a value corresponding to the received light intensity to the analog / digital conversion unit 22b as an analog electric signal.
  • the electrical signal input from the photodetector 21b to the analog / digital converter 22b is used for an optical input monitor.
  • the light detector 21g receives the amplified signal light branched from the optical coupler 21f to the light detector 21g side, and outputs a current having a value corresponding to the received light intensity to the analog / digital conversion unit 22b as an analog electric signal. Output.
  • the electrical signal input from the photodetector 21g to the analog / digital converter 22b is used for an optical output monitor.
  • the analog / digital converter 22b also has an electrical signal indicating the temperature of the pump laser element 21d to the pump laser element 21d, the intensity of the pump laser beam being output, or the drive current of the pump laser element being driven. Is entered. These electric signals are used for controlling the excitation laser element 21d.
  • the arithmetic processing unit 22c performs predetermined arithmetic processing based on each electric signal input to the analog / digital conversion unit 22b, and drives the pump laser element 21d so that the preamplifier 21 is in a predetermined control state. Control the flow of current.
  • ALC Automatic Level Control
  • AGC Automatic Gain Control
  • ACC Automatic Current Control
  • APC Automatic Pump Power Control
  • the arithmetic processing unit 22c monitors the state of the preamplifier 21, and for example, the light input or light output becomes a predetermined value or less, or the temperature of the pump laser element 21d becomes a predetermined value or more.
  • control is performed such that the drive current to the excitation laser element 21d is cut off or an alarm is issued.
  • the value of the drive current supplied to the pump laser element 21d becomes a predetermined value or more, it is detected as an abnormal operation of the preamplifier 21, and the above control is performed.
  • the alarm is issued by voice or image display on the personal computer PC, for example.
  • the post-amplifier control circuits 42-1 to 42-N are disposed in the respective storage units in the same manner as in FIG.
  • information data D2-1 to D2-N (indicated by # 1 to #N) used for controlling the operations of the rear optical amplifiers 40-1 to 40-N are stored.
  • the preamplifier control circuit 22 of the preamplifier 20 uses information data D2 used for controlling the operations of the postamplifiers 41-1 to 41-N in the storage unit 22d.
  • Data D1 including all of -1 to D2-N is stored.
  • the preamplifier control circuit 22 stores data of information used for controlling the operation of the preamplifier 21 in the storage unit 22d.
  • the storage section 22d has a storage area A for controlling the operation of the optical amplification section to which it corresponds, and a storage area B for controlling the operation of other optical amplification to which the other control circuit corresponds. is doing.
  • the storage unit 22d includes one or a plurality of storage elements, and an independent storage element or storage element group may be allocated to each of the storage areas A and B, or the storage area A , B may correspond to a divided area of the data space formed by one or a plurality of storage elements.
  • the post optical amplifier 40-1 fails, the post optical amplifier 40-1 is replaced with a spare post optical amplifier.
  • the preamplifier control circuit 22 of the preamplifier 20 performs bidirectional communication with the postamplifier control circuit of the exchanged post optical amplifier via the electric signal transmission line EL1.
  • the data D2-1 of information used for controlling the operation of the post-amplifier unit 41-1 before the exchange is transmitted to the control circuit for the post-amplifier unit after the exchange.
  • the post-switching post-amplifier can operate under the same operating conditions as those of the post-switching post-amplifying unit 41-1 based on the transmitted data information.
  • Data communication can be performed using various protocols such as Telnet and TCP / IP.
  • the control circuit of each optical amplifier stores only data of information used for controlling the operation of the amplification unit. Various problems have occurred with the replacement.
  • the preamplifier control circuit 22 as the second control unit of the pre-amplifier 20 as the second optical transmission device includes the post-amplifier 41- Data D1 including all of data D2-1 to D2-N of information used for controlling the respective operations of 1 to 41-N is stored. Then, when a certain rear optical amplifier is replaced, information used for controlling the rear optical amplifier (first optical transmission device) after the replacement is used as a rear end of the rear optical amplifier after the replacement. The data is transmitted to the amplifier control circuit (first control unit).
  • the arithmetic processing unit 22c of the preamplifier control circuit 22 monitors the state of the rear optical amplifiers 40-1 to 40-N, and when a certain rear optical amplifier is replaced, This may be done by sending data to the post-amp after replacement.
  • the post-replacement post-amplifier may autonomously request the pre-amplifier control circuit 22 to transmit data and transmit the data according to the request.
  • the information included in these data D2-1 to D2-N is reference information for the post-replacement optical amplifier to operate in the same manner as the post-replacement post-optical amplifier.
  • the optical transmission system 100 is an optical transmission system suitable for exchanging a post-optical amplifier.
  • the information used for controlling the post-amplifier is, for example, static characteristics, dynamic characteristics, alarm conditions, or unique information of the post-amplifier. These pieces of information are then stored in association with position information for specifying the post-amplifier.
  • Information on the static characteristics of the post-amplifier includes, for example, driving conditions of the pump laser element for ACC control, output signal light power for ALC control, gain for AGC control, and optical input / output monitor information Etc. are included.
  • the information on the dynamic characteristics of the post-optical amplifier includes, for example, the timing of starting the post-optical amplifier after the post-optical amplifier is replaced, the timing of shutting down the post-optical amplifier, and the subsequent restart. .
  • the activation or restarting of the post-optical amplifier means that the pump laser element 21d of the post-optical amplifier to be activated is changed from the OFF state to the ON state, and the post-optical amplifier is shut down.
  • the pump laser element 21d of the optical amplifier is changed from the ON state to the OFF state, and the optical transmission system 100 is always in the ON state during these operations.
  • the information on the timing of shutdown and restart is necessary for matching the operation timing with the optical amplifiers connected before and after the replaced post-amplifier.
  • the matching of the operation timing is performed, for example, when the front optical amplifier 20 transmits an operation state signal (flag) indicating an ON state, and the rear optical amplifier receives this, the rear optical amplifier receives a predetermined signal. This is performed by starting or restarting according to the timing information of starting or restarting.
  • this operation timing matching is performed when, for example, the front optical amplifier 20 transmits a flag indicating an OFF state and the rear optical amplifier receives this (or the rear optical amplifier is in the ON state).
  • the post-optical amplifier is shut down in accordance with predetermined shutdown timing information. As described above, the operation timing matching is realized by the front optical amplifier 20 transmitting the flag and the rear optical amplifier receiving the flag.
  • this timing information includes information on the fall time at the time of shutdown of the pump laser light from the pump laser element 21d or the rise time at the time of restart. This is because an unexpected malfunction may occur due to mismatch of the fall time or the rise time.
  • the information related to the alarm condition of the post-amplifier includes the alarm issue / release threshold, the alarm issue / release timing, hold / non-hold condition, mask, and the like.
  • the holding / non-holding condition is, for example, a condition for holding or not holding an alarm issue. For example, if a condition is set so that an alarm is issued until a place or cause where an abnormal operation has occurred is specified, it becomes easy to identify the fault location.
  • the mask is a setting of the determination period and the number of determinations for issuing an alarm. For example, the mask is set so that an alarm is issued for the first time when an alarm generation condition occurs a predetermined number of times.
  • the specific information of the post-optical amplifier is, for example, conditions for setting operations such as static characteristics and dynamic characteristics, and firmware and hardware version information.
  • Each of the data D2-1 to D2-N may include all the information described above, or may include information appropriately selected from the information.
  • the difference between the information about the post-replacement optical amplifier before the exchange and the information about the post-replacement optical amplifier after the exchange can be obtained by the control circuit 22 for the pre-amplifier of the pre-amplifier 20 or It may be determined that only the difference is received by the post-amplifier after the replacement from the pre-amplifier control circuit 22.
  • FIG. 3 is a schematic configuration diagram of an optical transmission system according to Embodiment 2 of the present invention.
  • This optical transmission system 200 is different from the optical transmission system 100 in that an upper network element 80 is connected to the upper side of the pre-amplifier 20 via the optical input port 10, and in other points. Are identical.
  • the upper network element 80 includes, for example, an optical transmission device that is an optical transmission device that outputs signal light, and an optical transmission device such as an optical amplifier that is higher than the pre-amplifier 20.
  • the upper network element 80 is also referred to as a monitoring control device, and may include a device having a function for managing and monitoring system failure management, configuration management, and performance and security as necessary. .
  • a control circuit (first control circuit) of any one of the optical transmission devices (first optical transmission devices) constituting the upper network element 80 is connected to the rear optical amplifiers 40-1 to 40-N.
  • Data D1 including all of the information data D2-1 to D2-N used for controlling each operation and information data used for controlling the operation of the pre-amplifier 20 are stored. is doing. Then, if any of the front optical amplifier 20 and the rear optical amplifiers 40-1 to 40-N fails and is replaced, the replaced front or rear optical amplifier (second optical transmission device)
  • the control circuit (second control circuit) communicates with the control circuit of the optical transmission device of the higher-level network element 80, and data of information used to control the operation of the pre-amplifier or post-amplifier before replacement To get.
  • the post-amplifier after replacement is acquired via the pre-amplifier 20.
  • the replaced pre- or post-optical amplifier is configured to acquire data of information used from an optical transmission device higher than the pre-optical amplifier 20.
  • FIG. 4 is a schematic configuration diagram of an optical transmission system according to Embodiment 3 of the present invention. This optical transmission system 300 is different from the optical transmission system 100 in the following two points.
  • the electric signal transmission line EL2 for connecting the post-amplifier control circuits 42-1 to 42-N to each other through the pre-amplifier control circuit 22 of the pre-amplifier 20 is provided. It is configured.
  • FIG. 4 shows, as an example, an electric signal path EL3 that connects the post-amplifier control circuit 42-1 and the post-amplifier control circuit 42-N.
  • each of the post-amplifier control circuits 42-1 to 42-N stores data D1 including all of the data D2-1 to D2-N.
  • the post-amplifier control circuit for the rear optical amplifier after replacement is replaced with another rear amplifier. It communicates with the control circuit for the post-amplifier of the post-amplifier, and acquires information data used for controlling the operation of the post-amplifier before replacement.
  • a communication mode direct communication between the control circuits for the post-amplifier of the post-optical amplifier using the path EL3 and the pre-amplifier of the pre-optical amplifier 20 using the electric signal transmission line EL2 are used.
  • the communication between the post-amplifier control circuits for the post-optical amplifier via the control circuit 22 is illustrated.
  • the rear optical amplifiers 40-1 to 40-N communicate with each other to transmit and receive data, so that the optical transmission system has higher redundancy and reliability.
  • FIG. 5 is a schematic configuration diagram of an optical transmission system according to Embodiment 4 of the present invention.
  • the optical transmission system 400 is different from the optical transmission system 100 in the following points.
  • each of the post-amplifier control circuits 42-1 to 42-N is used for controlling the operation of each of the post-optical amplifiers 40-1 to 40-N.
  • Data D3 including all the data D2-1 to D2-N and information data (indicated by #PA) used for controlling the operation of the pre-amplifier 20 are stored.
  • the preamplifier control circuit 22 is connected to each of the postamplifier control circuits 42-1 to 42-N via an electrical signal transmission line and an electrical connector, but in FIG. Only the electric signal transmission line EL4 for connecting the preamplifier control circuit 22 and the postamplifier control circuits 42-2 and 42-N is shown.
  • the rear optical amplifier after the replacement is post-amplified.
  • the part control circuit communicates with the other post-amplifier control circuit of the rear optical amplifier via the front amplifier control circuit 22 of the front optical amplifier 20, and the rear optical amplifier before replacement Get the data of information that was used to control the operation of the.
  • the pre-amplifier control circuit of the pre-optical amplifier after replacement is replaced with the post-optical amplifiers 40-1 to 40-.
  • N is communicated with the control circuit for the post-amplifier unit of N (the post-optical amplifier 40-2 in FIG. 5), and the data of the information used for controlling the operation of the post-optical amplifier after the exchange get.
  • the rear optical amplifiers 40-1 to 40-N communicate with each other to transmit and receive data, and information related to the control of the upper optical amplifier 20 is transmitted to the lower optical amplifiers. Redundancy and reliability are improved by employing the configuration of 40-1 to 40-N.
  • the information used for controlling the operation of the front optical amplifier 20 for example, the static characteristics, the dynamic characteristics, the alarm conditions, or the specific information of the front optical amplifier 20, as in the first embodiment. It is.
  • the static characteristics, alarm conditions, and unique information of the front optical amplifier 20 may be the same information as the static characteristics, alarm conditions, and unique information of the rear optical amplifier described in the first embodiment.
  • the information on the dynamic characteristics of the pre-amplifier 20 includes, for example, the start timing of the pre-amplifier 20 after the replacement of the pre-amplifier 20, the shutdown timing of the pre-amplifier 20 and the subsequent restart timing. Etc. are included. Information on the timing of shutdown and restart is necessary for matching the operation timing with the optical amplifiers connected before and after the replaced pre-amplifier 20. This operation timing matching is performed, for example, when the rear optical amplifier transmits a flag indicating the OFF state as a flag and receives the OFF state flag from all the rear optical amplifiers to which the front optical amplifier 20 is connected. This is done by starting, restarting or shutting down the pre-amplifier 20 according to information of a predetermined timing.
  • this operation timing matching is performed when, for example, the pre-optical amplifier 20 is set to a predetermined state when it is recognized from the reception state of the flag of the pre-optical amplifier 20 that all the post-optical amplifiers are OFF or not connected. It may be performed by starting, restarting or shutting down according to the timing information.
  • the operation timing matching is realized by the post-optical amplifier transmitting the flag and the pre-optical amplifier 20 receiving the flag.
  • the start or restart timing can be matched so that the rear optical amplifier is not turned ON before the front optical amplifier 20.
  • the configuration of the optical amplifier according to the above embodiment is an example.
  • the optical amplifier may have, for example, a configuration including a plurality of pump laser elements or a multistage configuration.
  • the optical amplifier is composed of a front optical amplifier and a rear optical amplifier, but an optical distributor and a plurality of rear optical amplifiers may be further connected to the output side of the rear optical amplifier. .
  • data communication is performed via an electric signal transmission path, but communication may be performed by radio or optical signal.
  • the optical transmission device arranged on the branched optical transmission line is mainly an optical amplifier, but may be appropriately replaced with another optical transmission device. Further, different types of optical transmission devices may be mixed and arranged.
  • the optical transmission system according to the present invention is suitable for use in the field of optical communications.
  • Optical input port 20 Pre-amplifier 21 Pre-amplifier 21a, 21f Optical coupler 21b, 21g Photo detector 21c Wavelength multiple polymerization demultiplexer coupler 21d Excitation laser element 21e Amplifying optical fiber 22 Pre-amplifier control circuit 22a Digital / analog conversion unit 22b Analog / digital conversion unit 22c Arithmetic processing unit 22d Storage unit 22e Input / output unit 30 Optical distributors 40-1 to 40-N Post-optical amplifiers 41-1 to 41-N Post-amplifiers 42- 1 to 42-N Post-amplifier control circuit 50-1 to 50-N Optical output port 60-1 to 60-N Optical connector 70-1 to 70-N Electrical connector 80 Host network element 100, 200, 300, 400 Optical transmission system D1 data D2-1 to D2-N data D3 data EL1, EL2, EL4 Electric signal transmission Road EL3 route PC personal computer

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Abstract

A plurality of optical transmission devices each configured to be replaceable are disposed on a branched optical transmission line, the plurality of optical transmission devices include a first optical transmission device and a second optical transmission device, the first optical transmission device has a first control unit for controlling the operation of the first optical transmission device, the second optical transmission device has a second control unit for controlling the operation of the second optical transmission device, the second control unit stores data relating to information serving as a reference and used for the first control unit to control the first optical transmission device and is configured to mutually communicate with the first control unit and transmit the data to the first control unit. Consequently, it is possible to provide an optical transmission system (100) in which a plurality of optical amplifiers are disposed in a branched optical transmission line, the optical transmission system being suitable for use when the optical amplifiers are replaced.

Description

光伝送システムOptical transmission system
　本発明は、光伝送システムに関するものである。 The present invention relates to an optical transmission system.
　ＦＴＴｘ用映像分配システムにおいて、従来、光伝送装置としての光増幅器は、１つの高出力の光増幅器の出力側に複数の光分配器を接続して、マルチポートの出力構成としている。しかしながら、光増幅器に障害が発生した場合には、すべての出力ポートに接続された多数の加入者へ障害が波及するおそれがある。そこで、障害波及範囲を極力狭い領域に収めるために複数の光増幅器を用いる場合がある。（特許文献１参照）。 In the video distribution system for FTTx, conventionally, an optical amplifier as an optical transmission apparatus has a multi-port output configuration by connecting a plurality of optical distributors to the output side of one high output optical amplifier. However, when a failure occurs in the optical amplifier, the failure may spread to a large number of subscribers connected to all output ports. Therefore, there are cases where a plurality of optical amplifiers are used in order to keep the fault spillover range as narrow as possible. (See Patent Document 1).
　図６は、光分配器によって分岐した光伝送路上に複数の光増幅器を配置した光伝送システムの一例の模式的な構成図である。この光伝送システム１０００では、Ｎを２以上の整数として、１×Ｎの光分配器１０３０によって分岐した光伝送路上に、前置光増幅器１０２０と、Ｎ個の後置光増幅器１０４０－１～１０４０－Ｎが配置されている。 FIG. 6 is a schematic configuration diagram of an example of an optical transmission system in which a plurality of optical amplifiers are arranged on an optical transmission line branched by an optical distributor. In this optical transmission system 1000, N is an integer equal to or larger than 2, and a front optical amplifier 1020 and N rear optical amplifiers 1040-1 to 1040 are placed on an optical transmission path branched by a 1 × N optical distributor 1030. -N is arranged.
　前置光増幅器１０２０は、光増幅部である前置増幅部１０２１と、前置光増幅器１０２０の動作を制御する制御部である前置増幅部用制御回路１０２２とを備えている。前置増幅部用制御回路１０２２は前置光増幅器１０２０の動作を制御するために使用される情報のデータＤ１００１（♯Ａで示す）を記憶している。 The pre-amplifier 1020 includes a pre-amplifier 1021 that is an optical amplifier, and a pre-amplifier control circuit 1022 that is a controller that controls the operation of the pre-amplifier 1020. The preamplifier control circuit 1022 stores information data D1001 (indicated by #A) used to control the operation of the preamplifier 1020.
　後置光増幅器１０４０－１～１０４０－Ｎは、それぞれ、光増幅部である後置増幅部１０４１－１～１０４１－Ｎと、後置光増幅器１０４０－１～１０４０－Ｎの動作を制御する制御部である後置増幅部用制御回路１０４２－１～１０４２－Ｎとを備えている。後置増幅部用制御回路１０４２－１～１０４２－Ｎはそれぞれ、後置光増幅器１０４０－１～１０４０－Ｎのそれぞれの動作を制御するために使用される情報のデータＤ１００２－１～Ｄ１００２－Ｎ（♯１～♯Ｎで示す）をそれぞれ記憶している。 The rear optical amplifiers 1040-1 to 1040-N control the operations of the rear amplifying units 1041-1 to 1041-N and the rear optical amplifiers 1040-1 to 1040-N, which are optical amplifying units, respectively. And post-amplifier control circuits 1042-1 to 1042-N. The post-amplifier control circuits 1042-1 to 1042-N are information data D1002-1 to D1002-N used for controlling the operations of the post-optical amplifiers 1040-1 to 1040-N, respectively. (Indicated by # 1 to #N) are stored.
　光分配器１０３０は、１ポート側が前置光増幅器１０２０の光出力ポートに接続し、Ｎポート側が後置光増幅器１０４０－１～１０４０－Ｎのそれぞれの光入力ポートに光コネクタ１０６０－１～１０６０－Ｎを介して接続している。 In the optical distributor 1030, one port side is connected to the optical output port of the front optical amplifier 1020, and the N port side is connected to each optical input port of the rear optical amplifiers 1040-1 to 1040-N. Connected via -N.
　光入力ポート１０１０から前置光増幅器１０２０の光入力ポートに信号光が入力されると、前置光増幅器１０２０は信号光を増幅し、光分配器１０３０に出力する。光分配器１０３０は入力された信号光を略等分にＮ分岐し、後置光増幅器１０４０－１～１０４０－Ｎのそれぞれに出力する。後置光増幅器１０４０－１～１０４０－Ｎはそれぞれ入力された信号光を増幅して光出力ポート１０５０－１～１０５０－Ｎのそれぞれに出力する。光出力ポート１０５０－１～１０５０－Ｎから出力された各信号光は加入者に分配される。 When signal light is input from the optical input port 1010 to the optical input port of the pre-amplifier 1020, the pre-amplifier 1020 amplifies the signal light and outputs it to the optical distributor 1030. The optical distributor 1030 divides the inputted signal light into N equal parts and outputs it to each of the rear optical amplifiers 1040-1 to 1040 -N. The rear optical amplifiers 1040-1 to 1040-N amplify the input signal light and output the amplified signal light to the optical output ports 1050-1 to 1050-N, respectively. Each signal light output from the optical output ports 1050-1 to 1050-N is distributed to the subscribers.
特許第４９４８０８５号公報Japanese Patent No. 4948085
　図６に示した光伝送システムでは、或る光増幅器が故障した場合には、故障した光増幅器は予備の光増幅器に交換される。各光増幅器の制御回路は、その光増幅器を制御するために使用されるデータを記憶しているので、置き換えられた後、記憶されたデータに基づく動作状態で動作する。 In the optical transmission system shown in FIG. 6, when a certain optical amplifier fails, the failed optical amplifier is replaced with a spare optical amplifier. Since the control circuit of each optical amplifier stores data used to control the optical amplifier, after being replaced, the control circuit operates in an operation state based on the stored data.
　ここで、光出力ポート１０５０－１～１０５０－Ｎから加入者までの距離が、ポートごとで異なる場合がある等の理由によって、光増幅器ごとに必要な特性、たとえば光増幅特性が異なる。したがって、故障による交換を行う場合には、特性が異なる光増幅器ごとに予備の光増幅器を用意する必要があるので、用意すべき光増幅器の品種が多くなり、管理が煩雑になる。 Here, the required characteristics, for example, the optical amplification characteristics are different for each optical amplifier because the distance from the optical output ports 1050-1 to 1050-N to the subscriber may be different for each port. Therefore, when replacement is performed due to a failure, it is necessary to prepare a spare optical amplifier for each optical amplifier having different characteristics, so that the types of optical amplifiers to be prepared increase and management becomes complicated.
　また、この煩雑さを解消するために、各光増幅器として使用できる汎用の光増幅器を用意する場合、汎用の光増幅器とたとえば光減衰器などの増幅特性を調整するための装置とを組み合わせて使用する必要がある。たとえば、加入者までの伝送路の距離が、汎用の光増幅器の光出力に比して短い場合は、光減衰器で汎用の光増幅器の光出力を減衰させた上で、使用する必要がある。この場合、使用する装置点数の増加や電力の無駄な消費などの問題が生じる。 In addition, in order to eliminate this complexity, when preparing a general-purpose optical amplifier that can be used as each optical amplifier, a general-purpose optical amplifier is used in combination with a device for adjusting amplification characteristics such as an optical attenuator. There is a need to. For example, when the distance of the transmission line to the subscriber is shorter than the optical output of the general-purpose optical amplifier, it is necessary to use the optical output after attenuating the optical output of the general-purpose optical amplifier with an optical attenuator. . In this case, problems such as an increase in the number of devices to be used and unnecessary power consumption occur.
　また、交換前後で光増幅器の動特性が異なる場合などには、交換後の光増幅器と、その前後に接続された光増幅器との動作タイミングの不整合が生じ、意図せず問題動作を誘発させる場合がある。たとえば、後置光増幅器に前置光増幅器からの信号光の入力がない状態で後置光増幅器が立ち上がり、その後に前置光増幅器から信号光が入力された場合に、光サージが発生する等の問題が生じる。 In addition, when the dynamic characteristics of the optical amplifier are different before and after replacement, there is a mismatch in operation timing between the replaced optical amplifier and the optical amplifier connected before and after the replacement, and unintentionally induces problem operation. There is a case. For example, an optical surge occurs when the rear optical amplifier starts up without signal light input from the front optical amplifier and then signal light is input from the front optical amplifier. Problem arises.
　本発明は、上記に鑑みてなされたものであって、分岐した光伝送路上に複数の光増幅器を配置した光伝送システムにおいて、光増幅器を交換して使用するのに適する光伝送システムを提供することを目的とする。 The present invention has been made in view of the above, and provides an optical transmission system suitable for exchanging an optical amplifier in an optical transmission system in which a plurality of optical amplifiers are arranged on a branched optical transmission line. For the purpose.
　上述した課題を解決し、目的を達成するために、本発明に係る光伝送システムは、分岐した光伝送路上に、交換可能に構成された複数の光伝送装置が配置され、前記複数の光伝送装置は、第１光伝送装置と第２光伝送装置とを含み、前記第１光伝送装置は、前記第１光伝送装置の動作を制御する第１制御部を有し、前記第２光伝送装置は、前記第２光伝送装置の動作を制御する第２制御部を有し、前記第２制御部は、前記第１制御部が前記第１光伝送装置を制御するために使用する基準となる情報のデータを記憶しており、前記第１制御部と相互に通信を行って前記データを前記第１制御部に送信するように構成されていることを特徴とする。 In order to solve the above-described problems and achieve the object, an optical transmission system according to the present invention includes a plurality of optical transmission devices configured to be replaceable on a branched optical transmission path, and the plurality of optical transmissions. The apparatus includes a first optical transmission apparatus and a second optical transmission apparatus, and the first optical transmission apparatus includes a first control unit that controls an operation of the first optical transmission apparatus, and the second optical transmission apparatus The apparatus includes a second control unit that controls the operation of the second optical transmission device, and the second control unit includes a reference used by the first control unit to control the first optical transmission device. Is stored, and is configured to communicate with the first control unit and transmit the data to the first control unit.
　また、本発明に係る光伝送システムは、上記発明において、前記第２制御部は、前記第１制御部からの要求に従って前記データを送信することを特徴とする。 In the optical transmission system according to the present invention as set forth in the invention described above, the second control unit transmits the data in accordance with a request from the first control unit.
　また、本発明に係る光伝送システムは、上記発明において、前記複数の光伝送装置は、後置光伝送装置と、前記光伝送路上において前記後置光伝送装置よりも上位に位置する前置光伝送装置とを含み、前記第１光伝送装置は、前記後置光伝送装置であり、前記第２光伝送装置は、前記前置光伝送装置であることを特徴とする。 In the optical transmission system according to the present invention as set forth in the invention described above, the plurality of optical transmission devices include a rear optical transmission device and a front light positioned above the rear optical transmission device on the optical transmission path. The first optical transmission device is the rear optical transmission device, and the second optical transmission device is the front optical transmission device.
　また、本発明に係る光伝送システムは、上記発明において、前記複数の光伝送装置は、後置光伝送装置と、前記光伝送路上において前記後置光伝送装置よりも上位に位置する前置光伝送装置とを含み、前記第１光伝送装置は、前記前置光伝送装置であり、前記第２光伝送装置は、前記後置光伝送装置であることを特徴とする。 In the optical transmission system according to the present invention as set forth in the invention described above, the plurality of optical transmission devices include a rear optical transmission device and a front light positioned above the rear optical transmission device on the optical transmission path. The first optical transmission device is the front optical transmission device, and the second optical transmission device is the rear optical transmission device.
　また、本発明に係る光伝送システムは、上記発明において、前記複数の光伝送装置は、複数の後置光伝送装置と、前記光伝送路上において前記複数の後置光伝送装置よりも上位に位置する前置光伝送装置とを含み、前記第１光伝送装置および前記第２光伝送装置は、前記複数の後置光伝送装置に含まれることを特徴とする。 In the optical transmission system according to the present invention, in the above invention, the plurality of optical transmission devices are positioned higher than the plurality of rear optical transmission devices on the optical transmission path. The first optical transmission device and the second optical transmission device are included in the plurality of rear optical transmission devices.
　また、本発明に係る光伝送システムは、上記発明において、前記複数の光伝送装置は、複数の後置光伝送装置と、前記光伝送路上において前記複数の後置光伝送装置よりも上位に位置する前置光伝送装置と、前記前置光伝送装置よりもさらに上位に位置する上位光伝送装置とを含み、前記第１光伝送装置は、前記上位光伝送装置であり、前記第２光伝送装置は、前記前置光伝送装置または前記後置光伝送装置であることを特徴とする。 In the optical transmission system according to the present invention, in the above invention, the plurality of optical transmission devices are positioned higher than the plurality of rear optical transmission devices on the optical transmission path. A first optical transmission device, the first optical transmission device being the higher optical transmission device, and the second optical transmission. The apparatus is the front optical transmission apparatus or the rear optical transmission apparatus.
　また、本発明に係る光伝送システムは、上記発明において、前記基準となる情報は、前記第１光伝送装置の静特性、動特性、アラーム条件、または固有情報の情報と、該情報と関連付けられた、前記第１光伝送装置を特定するための位置情報とを含むことを特徴とする。 In the optical transmission system according to the present invention as set forth in the invention described above, the reference information is associated with the static characteristic, dynamic characteristic, alarm condition, or specific information information of the first optical transmission apparatus. And positional information for specifying the first optical transmission device.
　また、本発明に係る光伝送システムは、上記発明において、前記複数の光伝送装置は光増幅器を含むことを特徴とする。 The optical transmission system according to the present invention is characterized in that, in the above invention, the plurality of optical transmission devices include optical amplifiers.
　本発明によれば、光増幅器を交換して使用するのに適する光伝送システムを実現できるという効果を奏する。 According to the present invention, it is possible to realize an optical transmission system suitable for exchanging and using an optical amplifier.
図１は、実施の形態１に係る光伝送システムの模式的な構成図である。FIG. 1 is a schematic configuration diagram of an optical transmission system according to the first embodiment. 図２は、前置光増幅器の模式的な構成図である。FIG. 2 is a schematic configuration diagram of the front optical amplifier. 図３は、実施の形態２に係る光伝送システムの模式的な構成図である。FIG. 3 is a schematic configuration diagram of the optical transmission system according to the second embodiment. 図４は、実施の形態３に係る光伝送システムの模式的な構成図である。FIG. 4 is a schematic configuration diagram of the optical transmission system according to the third embodiment. 図５は、実施の形態４に係る光伝送システムの模式的な構成図である。FIG. 5 is a schematic configuration diagram of an optical transmission system according to the fourth embodiment. 図６は、光分配器を用いて分岐した光伝送路上に複数の光増幅器を配置した光伝送システムの一例の模式的な構成図である。FIG. 6 is a schematic configuration diagram of an example of an optical transmission system in which a plurality of optical amplifiers are arranged on an optical transmission line branched using an optical distributor.
　以下に、図面を参照して本発明に係る光伝送システムの実施の形態を詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。また、各図面において、同一または対応する要素には適宜同一の符号を付している。また、図面は模式的なものであり、各要素の寸法の比率などは現実のものとは異なることに留意すべきである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。 Hereinafter, embodiments of an optical transmission system according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, in each drawing, the same code | symbol is attached | subjected suitably to the same or corresponding element. In addition, it should be noted that the drawings are schematic, and the ratio of the dimensions of each element is different from the actual one. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.
　図１は、本発明の実施の形態１に係る光伝送システムの模式的な構成図である。この光伝送システム１００では、１×Ｎの光分配器３０によって分岐した光伝送路上に、光伝送装置としての前置光増幅器２０と、光伝送装置としてのＮ個の後置光増幅器４０－１～４０－Ｎが配置されている。 FIG. 1 is a schematic configuration diagram of an optical transmission system according to Embodiment 1 of the present invention. In this optical transmission system 100, a pre-optical amplifier 20 as an optical transmission device and N post-optical amplifiers 40-1 as optical transmission devices on an optical transmission path branched by a 1 × N optical distributor 30. ˜40-N are arranged.
　前置光増幅器２０は、光増幅部である前置増幅部２１と、前置光増幅器２０の動作を制御する制御部である前置増幅部用制御回路２２とを備えている。 The pre-amplifier 20 includes a pre-amplifier 21 that is an optical amplifier and a pre-amplifier control circuit 22 that is a controller that controls the operation of the pre-amplifier 20.
　後置光増幅器４０－１～４０－Ｎは、それぞれ、光増幅部である後置増幅部４１－１～４１－Ｎと、後置光増幅器４０－１～４０－Ｎの動作を制御する制御部である後置増幅部用制御回路４２－１～４２－Ｎとを備えている。 The post-optical amplifiers 40-1 to 40-N control the operations of the post-amplifiers 41-1 to 41-N, which are optical amplifiers, and the post-optical amplifiers 40-1 to 40-N, respectively. And post-amplifier control circuits 42-1 to 42-N.
　光分配器３０は、１ポート側が前置光増幅器２０の光出力ポートに接続し、Ｎポート側が後置光増幅器４０－１～４０－Ｎのそれぞれの光入力ポートに光コネクタ６０－１～６０－Ｎを介して接続している。 The optical distributor 30 has one port connected to the optical output port of the front optical amplifier 20, and the N port side connected to each optical input port of the rear optical amplifiers 40-1 to 40-N. Connected via -N.
　前置光増幅器２０の光入力ポートは光入力ポート１０に接続しており、後置光増幅器４０－１～４０－Ｎの光出力ポートはそれぞれ光出力ポート５０－１～５０－Ｎに接続している。 The optical input port of the front optical amplifier 20 is connected to the optical input port 10, and the optical output ports of the rear optical amplifiers 40-1 to 40-N are connected to the optical output ports 50-1 to 50-N, respectively. ing.
　また、前置光増幅器２０の前置増幅部用制御回路２２は、電気信号伝送路ＥＬ１と電気コネクタ７０－１～７０－Ｎとを介して後置光増幅器４０－１～４０－Ｎの後置増幅部用制御回路４２－１～４２－Ｎのそれぞれに接続している。 The preamplifier control circuit 22 of the pre-amplifier 20 is connected to the post-amplifiers 40-1 to 40-N via the electrical signal transmission line EL1 and the electrical connectors 70-1 to 70-N. Each of the preamplifier control circuits 42-1 to 42-N is connected.
　つぎに、光増幅器の構成の一例について説明する。図２は、前置光増幅器の模式的な構成図である。なお、後置光増幅器４０－１～４０－Ｎのそれぞれも、図２に示す構成と同様の構成を有することができる。また、前置光増幅器２０および後置光増幅器４０－１～４０－Ｎは、故障した場合に予備の光増幅器に交換可能に構成されている。 Next, an example of the configuration of the optical amplifier will be described. FIG. 2 is a schematic configuration diagram of the front optical amplifier. Each of the rear optical amplifiers 40-1 to 40-N can have the same configuration as that shown in FIG. Further, the front optical amplifier 20 and the rear optical amplifiers 40-1 to 40-N are configured to be replaceable with spare optical amplifiers when a failure occurs.
　前置増幅部２１は、光カプラ２１ａと、光カプラ２１ａに接続した光検出器２１ｂと、前記光カプラ２１ａに接続した波長多重合分波カプラ２１ｃと、波長多重合分波カプラ２１ｃに接続した励起レーザ素子２１ｄと、波長多重合分波カプラ２１ｃに接続した増幅用光ファイバ２１ｅと、増幅用光ファイバ２１ｅに接続した光カプラ２１ｆと、光カプラ２１ｆに接続した光検出器２１ｇとを備えている。 The preamplifier 21 is connected to an optical coupler 21a, a photodetector 21b connected to the optical coupler 21a, a wavelength poly-multiplexing demultiplexing coupler 21c connected to the optical coupler 21a, and a wavelength poly-multiplexing demultiplexing coupler 21c. A pumping laser element 21d, an amplifying optical fiber 21e connected to the wavelength multiple polymerization demultiplexing coupler 21c, an optical coupler 21f connected to the amplifying optical fiber 21e, and a photodetector 21g connected to the optical coupler 21f are provided. Yes.
　光カプラ２１ａ、２１ｆは、入力された光の一部（たとえば１％～１０％）を分岐するものであり、たとえば溶融型やフィルタ型の光カプラである。光検出器２１ｂ、２１ｇは、光を受光してその受光強度に応じた値の電流を出力するものであり、たとえばフォトダイオードである。励起レーザ素子２１ｄは、増幅用光ファイバ２１ｅを励起するための励起レーザ光を出力するものであり、たとえば半導体レーザ素子である。波長多重合分波カプラ２１ｃは、光カプラ２１ａから入力された光と励起レーザ素子２１ｄから出力された励起レーザ光を合波して増幅用光ファイバ２１ｅに出力するものであり、たとえば溶融型やフィルタ型の光カプラである。 The optical couplers 21a and 21f branch a part of the input light (for example, 1% to 10%), and are, for example, fused or filter type optical couplers. The photodetectors 21b and 21g receive light and output a current having a value corresponding to the received light intensity, and are, for example, photodiodes. The pump laser element 21d outputs pump laser light for pumping the amplification optical fiber 21e, and is, for example, a semiconductor laser element. The wavelength multi-polymerization demultiplexing coupler 21c combines the light input from the optical coupler 21a and the pumping laser light output from the pumping laser element 21d and outputs them to the amplification optical fiber 21e. This is a filter type optical coupler.
　増幅用光ファイバ２１ｅは、光増幅媒体であるエルビウムやイッテルビウムなどの希土類元素がコアに添加された光ファイバであり、光増幅作用を有するものである。増幅用光ファイバ２１ｅとしてはたとえばダブルクラッド型の光ファイバを用いても良い。 The amplification optical fiber 21e is an optical fiber in which a rare earth element such as erbium or ytterbium, which is an optical amplification medium, is added to the core, and has an optical amplification function. As the amplification optical fiber 21e, for example, a double clad optical fiber may be used.
　つぎに、前置増幅部用制御回路２２は、デジタル／アナログ変換部２２ａと、アナログ／デジタル変換部２２ｂと、演算処理部２２ｃと、記憶部２２ｄと、入出力部２２ｅとを備えている。 Next, the preamplifier control circuit 22 includes a digital / analog converter 22a, an analog / digital converter 22b, an arithmetic processor 22c, a storage unit 22d, and an input / output unit 22e.
　デジタル／アナログ変換部２２ａは、デジタル電気信号をアナログ電気信号に変換するものである。アナログ／デジタル変換部２２ｂは、アナログ電気信号をデジタル電気信号に変換するものである。演算処理部２２ｃは、前置光増幅器２０の制御のための各種演算処理を行うものであり、たとえばＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）で構成される。記憶部２２ｄは、演算処理部２２ｃが演算処理を行うために使用する各種プログラムやデータ（ファームウェアなど）等が格納される部分と、演算処理部２２ｃが演算処理を行う際の作業スペース等として使用される部分を含み、たとえばＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）とＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）とで構成される。入出力部２２ｅは、電気信号伝送路ＥＬ１（図１参照）を介して他の制御回路と電気信号の入出力を行ったり、外部のパーソナルコンピュータＰＣと電気信号の入出力を行ったりするものである。入出力部２２ｅはたとえばＲＳ２３２Ｃポートやイーサネット（登録商標）ポートである。 The digital / analog converter 22a converts a digital electric signal into an analog electric signal. The analog / digital converter 22b converts an analog electric signal into a digital electric signal. The arithmetic processing unit 22c performs various arithmetic processes for controlling the pre-amplifier 20, and is composed of, for example, a CPU (Central Processing Unit). The storage unit 22d is used as a part for storing various programs and data (firmware and the like) used by the arithmetic processing unit 22c to perform arithmetic processing, and as a work space when the arithmetic processing unit 22c performs arithmetic processing. For example, it is composed of a ROM (Read Only Memory) and a RAM (Random Access Memory). The input / output unit 22e inputs / outputs electric signals to / from other control circuits via the electric signal transmission line EL1 (see FIG. 1), and inputs / outputs electric signals to / from an external personal computer PC. is there. The input / output unit 22e is, for example, an RS232C port or an Ethernet (registered trademark) port.
　前置光増幅器２０の基本的な動作について説明する。紙面左側の光入力ポートから信号光が入力されると、光カプラ２１ａは信号光を通過させるとともにその一部を光検出器２１ｂ側に分岐する。一方、励起レーザ素子２１ｄは前置増幅部用制御回路２２により制御された駆動電流を供給されて励起レーザ光を出力する。波長多重合分波カプラ２１ｃは、光カプラ２１ａから入力された信号光と励起レーザ素子２１ｄから出力された励起レーザ光を合波して増幅用光ファイバ２１ｅに出力する。増幅用光ファイバ２１ｅでは、希土類元素が励起レーザ光によって光励起されて光増幅作用を有しており、これによって信号光はレーザ増幅されて出力される。光カプラ２１ｆは増幅された信号光を通過させて出力するとともにその一部を光検出器２１ｇ側に分岐する。 The basic operation of the pre-amplifier 20 will be described. When signal light is input from the optical input port on the left side of the paper, the optical coupler 21a allows the signal light to pass and branches a part thereof to the photodetector 21b side. On the other hand, the pump laser element 21d is supplied with a drive current controlled by the preamplifier control circuit 22 and outputs pump laser light. The wavelength multi-polymerization demultiplexing coupler 21c combines the signal light input from the optical coupler 21a and the pump laser light output from the pump laser element 21d, and outputs the combined light to the amplification optical fiber 21e. In the amplification optical fiber 21e, the rare earth element is optically excited by the excitation laser light and has an optical amplification function, whereby the signal light is laser amplified and output. The optical coupler 21f passes and outputs the amplified signal light and branches a part thereof to the photodetector 21g side.
　光検出器２１ｂは、光カプラ２１ａから光検出器２１ｂ側に分岐された信号光を受光し、その受光強度に応じた値の電流をアナログ電気信号としてアナログ／デジタル変換部２２ｂに出力する。光検出器２１ｂからアナログ／デジタル変換部２２ｂに入力された電気信号は光入力モニタに使用される。光検出器２１ｇは、光カプラ２１ｆから光検出器２１ｇ側に分岐された、増幅された信号光を受光し、その受光強度に応じた値の電流をアナログ電気信号としてアナログ／デジタル変換部２２ｂに出力する。光検出器２１ｇからアナログ／デジタル変換部２２ｂに入力された電気信号は光出力モニタに使用される。また、アナログ／デジタル変換部２２ｂには、励起レーザ素子２１ｄから励起レーザ素子２１ｄの温度、および出力している励起レーザ光の強度、若しくは、駆動している励起レーザ素子の駆動電流を示す電気信号が入力される。これらの電気信号は励起レーザ素子２１ｄの制御に用いられる。 The photodetector 21b receives the signal light branched from the optical coupler 21a to the photodetector 21b, and outputs a current having a value corresponding to the received light intensity to the analog / digital conversion unit 22b as an analog electric signal. The electrical signal input from the photodetector 21b to the analog / digital converter 22b is used for an optical input monitor. The light detector 21g receives the amplified signal light branched from the optical coupler 21f to the light detector 21g side, and outputs a current having a value corresponding to the received light intensity to the analog / digital conversion unit 22b as an analog electric signal. Output. The electrical signal input from the photodetector 21g to the analog / digital converter 22b is used for an optical output monitor. The analog / digital converter 22b also has an electrical signal indicating the temperature of the pump laser element 21d to the pump laser element 21d, the intensity of the pump laser beam being output, or the drive current of the pump laser element being driven. Is entered. These electric signals are used for controlling the excitation laser element 21d.
　演算処理部２２ｃは、アナログ／デジタル変換部２２ｂに入力された各電気信号をもとに所定の演算処理を行い、前置増幅部２１が所定の制御状態となるように励起レーザ素子２１ｄに駆動電流を流す制御を行う。たとえば、前置増幅部２１を光出力が一定となるように制御するＡＬＣ（Ａｕｔｏｍａｔｉｃ　Ｌｅｖｅｌ　Ｃｏｎｔｒｏｌ）制御や、前置増幅部２１を利得が一定となるように制御するＡＧＣ（Ａｕｔｏｍａｔｉｃ　Ｇａｉｎ　Ｃｏｎｔｒｏｌ）制御や、励起レーザ素子２１ｄに流れる駆動電流が一定となるように制御するＡＣＣ（Ａｕｔｏｍａｔｉｃ　Ｃｕｒｒｅｎｔ　Ｃｏｎｔｒｏｌ）制御、或いは、励起レーザ素子２１ｄが出力する励起レーザ光のパワーを一定制御するＡＰＣ（Ａｕｔｏｍａｔｉｃ　Ｐｕｍｐ　Ｐｏｗｅｒ　Ｃｏｎｔｒｏｌ）を行う。なお、前置光増幅器においては、ＡＣＣまたはＡＬＣ制御が使用されることが多く、後置光増幅器においては、ＡＬＣ制御が使用されることが多い。 The arithmetic processing unit 22c performs predetermined arithmetic processing based on each electric signal input to the analog / digital conversion unit 22b, and drives the pump laser element 21d so that the preamplifier 21 is in a predetermined control state. Control the flow of current. For example, ALC (Automatic Level Control) control for controlling the preamplifier 21 so that the optical output is constant, AGC (Automatic Gain Control) control for controlling the preamplifier 21 so that the gain is constant, ACC (Automatic Current Control) control for controlling the drive current flowing through the pump laser element 21d to be constant, or APC (Automatic Pump Power Control) for constant control of the power of the pump laser light output from the pump laser element 21d. I do. In the front optical amplifier, ACC or ALC control is often used, and in the rear optical amplifier, ALC control is often used.
　また、演算処理部２２ｃは、前置増幅部２１の状態をモニタしており、たとえば光入力や光出力が所定の値以下になったり、励起レーザ素子２１ｄの温度が所定値以上になったり等の異常動作を検知した場合に、励起レーザ素子２１ｄへの駆動電流を遮断したり、アラームを発出したりする制御を行なう。また、励起レーザ素子２１ｄに供給する駆動電流の値が所定値以上になった場合にも、前置増幅部２１の異常動作として検知し、上記制御を行う。アラームの発出はたとえばパーソナルコンピュータＰＣにて音声や画像表示によって行われる。 In addition, the arithmetic processing unit 22c monitors the state of the preamplifier 21, and for example, the light input or light output becomes a predetermined value or less, or the temperature of the pump laser element 21d becomes a predetermined value or more. When an abnormal operation is detected, control is performed such that the drive current to the excitation laser element 21d is cut off or an alarm is issued. Further, when the value of the drive current supplied to the pump laser element 21d becomes a predetermined value or more, it is detected as an abnormal operation of the preamplifier 21, and the above control is performed. The alarm is issued by voice or image display on the personal computer PC, for example.
　ここで、図１に示すように、後置光増幅器４０－１～４０－Ｎの後置増幅部用制御回路４２－１～４２－Ｎはそれぞれの記憶部において、図６の場合と同様に、後置光増幅器４０－１～４０－Ｎのそれぞれの動作を制御するために使用される情報のデータＤ２－１～Ｄ２－Ｎ（♯１～♯Ｎで示す）をそれぞれ記憶している。 Here, as shown in FIG. 1, the post-amplifier control circuits 42-1 to 42-N are disposed in the respective storage units in the same manner as in FIG. In addition, information data D2-1 to D2-N (indicated by # 1 to #N) used for controlling the operations of the rear optical amplifiers 40-1 to 40-N are stored.
　一方、前置光増幅器２０の前置増幅部用制御回路２２は、記憶部２２ｄにおいて、後置増幅部４１－１～４１－Ｎのそれぞれの動作を制御するために使用される情報のデータＤ２－１～Ｄ２－Ｎのすべてを含むデータＤ１を記憶している。また、前置増幅部用制御回路２２は、上述したように、記憶部２２ｄにおいて前置増幅部２１の動作を制御するために使用される情報のデータを記憶している。したがって、記憶部２２ｄは、自身が対応する光増幅部の動作を制御するための記憶領域Ａと、他の制御回路が対応する他の光増幅の動作の制御のための記憶領域Ｂとを有している。これを実現するために、記憶部２２ｄは、１または複数の記憶素子からなり、記憶領域Ａ、Ｂにはそれぞれ、独立した記憶素子または記憶素子群が割り当てられていてもよいし、記憶領域Ａ、Ｂが、１または複数の記憶素子がなすデータ空間の分割された領域に対応するように構成してもよい。 On the other hand, the preamplifier control circuit 22 of the preamplifier 20 uses information data D2 used for controlling the operations of the postamplifiers 41-1 to 41-N in the storage unit 22d. Data D1 including all of -1 to D2-N is stored. Further, as described above, the preamplifier control circuit 22 stores data of information used for controlling the operation of the preamplifier 21 in the storage unit 22d. Accordingly, the storage section 22d has a storage area A for controlling the operation of the optical amplification section to which it corresponds, and a storage area B for controlling the operation of other optical amplification to which the other control circuit corresponds. is doing. In order to realize this, the storage unit 22d includes one or a plurality of storage elements, and an independent storage element or storage element group may be allocated to each of the storage areas A and B, or the storage area A , B may correspond to a divided area of the data space formed by one or a plurality of storage elements.
　この光伝送システム１００において、仮に後置光増幅器４０－１が故障した場合、後置光増幅器４０－１は、予備の後置光増幅器に交換される。交換後、前置光増幅器２０の前置増幅部用制御回路２２は、電気信号伝送路ＥＬ１を介して、交換された後置光増幅器の後置増幅部用制御回路と双方向の通信を行い、交換前の後置増幅部４１－１の動作を制御するために使用されていた情報のデータＤ２－１を、交換後の後置増幅部用制御回路に送信する。これによって、交換後の後置光増幅器は、送信されたデータの情報に基づいて、交換前の後置増幅部４１－１と同様の動作条件で動作することができる。なお、データ通信は、たとえばＴｅｌｎｅｔやＴＣＰ／ＩＰ等の各種プロトコルを用いて行なうことができる。 In this optical transmission system 100, if the post optical amplifier 40-1 fails, the post optical amplifier 40-1 is replaced with a spare post optical amplifier. After the exchange, the preamplifier control circuit 22 of the preamplifier 20 performs bidirectional communication with the postamplifier control circuit of the exchanged post optical amplifier via the electric signal transmission line EL1. Then, the data D2-1 of information used for controlling the operation of the post-amplifier unit 41-1 before the exchange is transmitted to the control circuit for the post-amplifier unit after the exchange. As a result, the post-switching post-amplifier can operate under the same operating conditions as those of the post-switching post-amplifying unit 41-1 based on the transmitted data information. Data communication can be performed using various protocols such as Telnet and TCP / IP.
　上述したように、図６に示すような従来の光伝送システムでは、各光増幅器の制御回路は、当該増幅部の動作を制御するために使用される情報のデータのみを記憶していたので、交換に伴い種々の問題を生じていた。 As described above, in the conventional optical transmission system as shown in FIG. 6, the control circuit of each optical amplifier stores only data of information used for controlling the operation of the amplification unit. Various problems have occurred with the replacement.
　しかしながら、本実施の形態１に係る光伝送システム１００では、第２光伝送装置としての前置光増幅器２０の第２制御部としての前置増幅部用制御回路２２が、後置増幅部４１－１～４１－Ｎのそれぞれの動作を制御するために使用される情報のデータＤ２－１～Ｄ２－Ｎのすべてを含むデータＤ１を記憶している。そして、或る後置光増幅器が交換された場合に、交換後の後置光増幅器（第１光伝送装置）を制御するために使用される情報を、交換後の後置光増幅器の後置増幅部用制御回路（第１制御部）に送信する。この送信は、たとえば前置増幅部用制御回路２２の演算処理部２２ｃが、後置光増幅器４０－１～４０－Ｎの状態を監視しており、或る後置光増幅器が交換されたら、交換後の後置光増幅器にデータを送信することによって行われてもよい。あるいは、交換後の後置光増幅器が自律的に前置増幅部用制御回路２２にデータの送信を要求し、その要求に従ってデータを送信するようにしてもよい。 However, in the optical transmission system 100 according to the first embodiment, the preamplifier control circuit 22 as the second control unit of the pre-amplifier 20 as the second optical transmission device includes the post-amplifier 41- Data D1 including all of data D2-1 to D2-N of information used for controlling the respective operations of 1 to 41-N is stored. Then, when a certain rear optical amplifier is replaced, information used for controlling the rear optical amplifier (first optical transmission device) after the replacement is used as a rear end of the rear optical amplifier after the replacement. The data is transmitted to the amplifier control circuit (first control unit). In this transmission, for example, the arithmetic processing unit 22c of the preamplifier control circuit 22 monitors the state of the rear optical amplifiers 40-1 to 40-N, and when a certain rear optical amplifier is replaced, This may be done by sending data to the post-amp after replacement. Alternatively, the post-replacement post-amplifier may autonomously request the pre-amplifier control circuit 22 to transmit data and transmit the data according to the request.
　これらのデータＤ２－１～Ｄ２－Ｎに含まれる情報は、交換後の後置光増幅器が、交換前の後置光増幅器と同様に動作するための基準の情報となるものである。これによって、特性が異なる光増幅器ごとに予備の光増幅器を用意する必要がなく、使用する装置点数の増加や電力の無駄な消費などの問題が生じず、かつ交換後の光増幅器と、その前後に接続された光増幅器との動作タイミングの不整合が生じず、予期せぬ問題動作を誘発させることも防止される。その結果、この光伝送システム１００は、後置光増幅器を交換して使用するのに適する光伝送システムである。 The information included in these data D2-1 to D2-N is reference information for the post-replacement optical amplifier to operate in the same manner as the post-replacement post-optical amplifier. As a result, there is no need to prepare a spare optical amplifier for each optical amplifier having different characteristics, and there are no problems such as an increase in the number of devices used and wasteful consumption of power. Inconsistency in operation timing with the optical amplifier connected to the optical amplifier does not occur, and unexpected problem operation is prevented. As a result, the optical transmission system 100 is an optical transmission system suitable for exchanging a post-optical amplifier.
　後置増幅部を制御するために使用される情報としては、たとえば、後置光増幅器の静特性、動特性、アラーム条件、または固有情報である。これらの情報は、その後置光増幅器を特定するための位置情報と関連して記憶される。 The information used for controlling the post-amplifier is, for example, static characteristics, dynamic characteristics, alarm conditions, or unique information of the post-amplifier. These pieces of information are then stored in association with position information for specifying the post-amplifier.
　後置光増幅器の静特性に関する情報には、たとえば、ＡＣＣ制御のための励起レーザ素子の駆動条件、ＡＬＣ制御のための出力信号光のパワー、ＡＧＣ制御のための利得、光入出力のモニタ情報などが含まれる。 Information on the static characteristics of the post-amplifier includes, for example, driving conditions of the pump laser element for ACC control, output signal light power for ALC control, gain for AGC control, and optical input / output monitor information Etc. are included.
　後置光増幅器の動特性に関する情報には、たとえば、後置光増幅器が交換された後の後置光増幅器の起動のタイミング、後置光増幅器のシャットダウンおよびその後の再起動のタイミングなどが含まれる。なお、後置光増幅器の起動または再起動とは、起動させる後置光増幅器の励起レーザ素子２１ｄをＯＦＦ状態からＯＮ状態にすることであり、後置光増幅器のシャットダウンとは、シャットダウンさせる後置光増幅器の励起レーザ素子２１ｄをＯＮ状態からＯＦＦ状態にすることであり、これらの動作時において、光伝送システム１００は常にＯＮ状態である。 The information on the dynamic characteristics of the post-optical amplifier includes, for example, the timing of starting the post-optical amplifier after the post-optical amplifier is replaced, the timing of shutting down the post-optical amplifier, and the subsequent restart. . The activation or restarting of the post-optical amplifier means that the pump laser element 21d of the post-optical amplifier to be activated is changed from the OFF state to the ON state, and the post-optical amplifier is shut down. The pump laser element 21d of the optical amplifier is changed from the ON state to the OFF state, and the optical transmission system 100 is always in the ON state during these operations.
　シャットダウンおよび再起動のタイミングの情報は、交換された後置光増幅器の前後に接続された光増幅器との動作タイミングの整合のために必要となる。この動作タイミングの整合は、たとえば、前置光増幅器２０が動作状態信号（フラグ）としてＯＮ状態を示すものを送信し、後置光増幅器がこれを受信した場合に、後置光増幅器が所定の起動または再起動のタイミングの情報に従って起動または再起動することにより行われる。同様に、この動作タイミングの整合は、たとえば、前置光増幅器２０がフラグとしてＯＦＦ状態を示すものを送信し、後置光増幅器がこれを受信した場合（または、後置光増幅器がＯＮ状態のフラグを受信しない場合、後置光増幅器が接続されていないと認められる場合など）に、後置光増幅器が所定のシャットダウンのタイミングの情報に従ってシャットダウンすることにより行われる。このように、動作タイミングの整合は、前置光増幅器２０がフラグを送信し、後置光増幅器がフラグを受信することにより実現される。 The information on the timing of shutdown and restart is necessary for matching the operation timing with the optical amplifiers connected before and after the replaced post-amplifier. The matching of the operation timing is performed, for example, when the front optical amplifier 20 transmits an operation state signal (flag) indicating an ON state, and the rear optical amplifier receives this, the rear optical amplifier receives a predetermined signal. This is performed by starting or restarting according to the timing information of starting or restarting. Similarly, this operation timing matching is performed when, for example, the front optical amplifier 20 transmits a flag indicating an OFF state and the rear optical amplifier receives this (or the rear optical amplifier is in the ON state). When the flag is not received, or when it is recognized that the post-optical amplifier is not connected or the like), the post-optical amplifier is shut down in accordance with predetermined shutdown timing information. As described above, the operation timing matching is realized by the front optical amplifier 20 transmitting the flag and the rear optical amplifier receiving the flag.
　動作タイミングを整合させることによって、光サージの発生等の問題動作の発生を回避することができる。なお、このタイミングの情報は、励起レーザ素子２１ｄからの励起レーザ光のシャットダウン時の立下り時間または再起動時の立上がり時間の情報も含まれている。立下り時間または立上がり時間の不整合によっても、予期せぬ誤動作が生じる可能性があるからである。 ∙ By matching the operation timing, it is possible to avoid the occurrence of problematic operations such as the occurrence of optical surges. Note that this timing information includes information on the fall time at the time of shutdown of the pump laser light from the pump laser element 21d or the rise time at the time of restart. This is because an unexpected malfunction may occur due to mismatch of the fall time or the rise time.
　後置光増幅器のアラーム条件に関する情報には、アラームの発出、解除の閾値や、アラームの発出、解除のタイミング、保持・非保持条件、マスクなどが含まれる。保持・非保持条件とは、たとえばアラームの発出を保持または非保持とする条件である。たとえば、アラームの発出を、異常動作が起こった場所や原因が特定されるまで保持するように条件を設定しておけば、故障箇所の特定が容易となる。また、マスクとは、アラームを発出するための判定期間や判定回数の設定であり、たとえばアラームの発出条件が所定の回数だけ発生したときに、初めてアラームを発出するようにマスクを設定する。 The information related to the alarm condition of the post-amplifier includes the alarm issue / release threshold, the alarm issue / release timing, hold / non-hold condition, mask, and the like. The holding / non-holding condition is, for example, a condition for holding or not holding an alarm issue. For example, if a condition is set so that an alarm is issued until a place or cause where an abnormal operation has occurred is specified, it becomes easy to identify the fault location. The mask is a setting of the determination period and the number of determinations for issuing an alarm. For example, the mask is set so that an alarm is issued for the first time when an alarm generation condition occurs a predetermined number of times.
　後置光増幅器の固有情報とは、たとえば静特性、動特性等の動作を設定するための条件や、ファームウェアやハードウェアのバージョン情報である。 The specific information of the post-optical amplifier is, for example, conditions for setting operations such as static characteristics and dynamic characteristics, and firmware and hardware version information.
　データＤ２－１～Ｄ２－Ｎのそれぞれは、上述したすべての情報を含んでいても良いし、その中から適宜選択された情報を含んでいてもよい。あるいは、交換前の後置光増幅器に関する情報と、交換後の後置光増幅器に関する情報との差分を、前置光増幅器２０の前置増幅部用制御回路２２または交換後の後置光増幅器が判定して、その差分だけを、交換後の後置光増幅器が前置増幅部用制御回路２２から受信するようにしてもよい。 Each of the data D2-1 to D2-N may include all the information described above, or may include information appropriately selected from the information. Alternatively, the difference between the information about the post-replacement optical amplifier before the exchange and the information about the post-replacement optical amplifier after the exchange can be obtained by the control circuit 22 for the pre-amplifier of the pre-amplifier 20 or It may be determined that only the difference is received by the post-amplifier after the replacement from the pre-amplifier control circuit 22.
（実施の形態２）
　図３は、本発明の実施の形態２に係る光伝送システムの模式的な構成図である。この光伝送システム２００は、前置光増幅器２０の上位側に、光入力ポート１０を介して上位ネットワークエレメント８０が接続されている点で、光伝送システム１００とは異なっており、その他の点では同一である。 (Embodiment 2)
FIG. 3 is a schematic configuration diagram of an optical transmission system according to Embodiment 2 of the present invention. This optical transmission system 200 is different from the optical transmission system 100 in that an upper network element 80 is connected to the upper side of the pre-amplifier 20 via the optical input port 10, and in other points. Are identical.
　上位ネットワークエレメント８０は、たとえば、信号光を出力する光伝送装置である光送信装置や、前置光増幅器２０よりもさらに上位の光増幅器等の光伝送装置で構成されている。上位ネットワークエレメント８０は、監視制御装置とも呼ばれるものであり、システムの故障管理、構成の管理、また、必要に応じてパフォーマンスやセキュリティを管理・監視する機能を有する装置を含むものであってもよい。 The upper network element 80 includes, for example, an optical transmission device that is an optical transmission device that outputs signal light, and an optical transmission device such as an optical amplifier that is higher than the pre-amplifier 20. The upper network element 80 is also referred to as a monitoring control device, and may include a device having a function for managing and monitoring system failure management, configuration management, and performance and security as necessary. .
　この光伝送システム２００では、上位ネットワークエレメント８０を構成するいずれかの光伝送装置（第１光伝送装置）の制御回路（第１制御回路）が、後置光増幅器４０－１～４０－Ｎのそれぞれの動作を制御するために使用される情報のデータＤ２－１～Ｄ２－Ｎのすべてを含むデータＤ１、および、前置光増幅器２０の動作を制御するために使用される情報のデータを記憶している。そして、前置光増幅器２０および後置光増幅器４０－１～４０－Ｎのいずれかが故障し、交換された場合に、交換後の前置または後置光増幅器（第２光伝送装置）の制御回路（第２制御回路）は、上位ネットワークエレメント８０の光伝送装置の制御回路と通信を行い、交換前の前置または後置増幅部の動作を制御するために使用されていた情報のデータを取得する。なお、交換後の後置光増幅器については、前置光増幅器２０を経由してデータの取得を行う。この光伝送システム２００では、交換後の前置または後置光増幅器は、前置光増幅器２０よりも上位の光伝送装置から使用される情報のデータを取得する構成となっている。これによって、前置および後置光増幅器のいずれが交換されても、動作タイミングの連動性等が保たれるので、さらにインテリジェントな動作制御を設定することが可能となる。 In this optical transmission system 200, a control circuit (first control circuit) of any one of the optical transmission devices (first optical transmission devices) constituting the upper network element 80 is connected to the rear optical amplifiers 40-1 to 40-N. Data D1 including all of the information data D2-1 to D2-N used for controlling each operation and information data used for controlling the operation of the pre-amplifier 20 are stored. is doing. Then, if any of the front optical amplifier 20 and the rear optical amplifiers 40-1 to 40-N fails and is replaced, the replaced front or rear optical amplifier (second optical transmission device) The control circuit (second control circuit) communicates with the control circuit of the optical transmission device of the higher-level network element 80, and data of information used to control the operation of the pre-amplifier or post-amplifier before replacement To get. Note that the post-amplifier after replacement is acquired via the pre-amplifier 20. In this optical transmission system 200, the replaced pre- or post-optical amplifier is configured to acquire data of information used from an optical transmission device higher than the pre-optical amplifier 20. As a result, even if either the front optical amplifier or the rear optical amplifier is replaced, the interlocking of the operation timing and the like are maintained, so that more intelligent operation control can be set.
（実施の形態３）
　図４は、本発明の実施の形態３に係る光伝送システムの模式的な構成図である。この光伝送システム３００は、以下の２点において、光伝送システム１００とは異なっている。 (Embodiment 3)
FIG. 4 is a schematic configuration diagram of an optical transmission system according to Embodiment 3 of the present invention. This optical transmission system 300 is different from the optical transmission system 100 in the following two points.
　まず、光伝送システム３００では、前置光増幅器２０の前置増幅部用制御回路２２を介して後置増幅部用制御回路４２－１～４２－Ｎの相互を接続する電気信号伝送路ＥＬ２が構成されている。なお、図４では、例として、後置増幅部用制御回路４２－１と後置増幅部用制御回路４２－Ｎとを接続する電気信号の経路ＥＬ３を示している。 First, in the optical transmission system 300, the electric signal transmission line EL2 for connecting the post-amplifier control circuits 42-1 to 42-N to each other through the pre-amplifier control circuit 22 of the pre-amplifier 20 is provided. It is configured. FIG. 4 shows, as an example, an electric signal path EL3 that connects the post-amplifier control circuit 42-1 and the post-amplifier control circuit 42-N.
　また、光伝送システム３００では、後置増幅部用制御回路４２－１～４２－Ｎのそれぞれが、データＤ２－１～Ｄ２－Ｎのすべてを含むデータＤ１を記憶している。 In the optical transmission system 300, each of the post-amplifier control circuits 42-1 to 42-N stores data D1 including all of the data D2-1 to D2-N.
　光伝送システム３００では、後置光増幅器４０－１～４０－Ｎのいずれかが故障し、交換された場合に、交換後の後置光増幅器の後置増幅部用制御回路は、他の後置光増幅器の後置増幅部用制御回路と通信を行い、交換前の後置光増幅器の動作を制御するために使用される情報のデータを取得する。通信の態様としては、経路ＥＬ３を用いた後置光増幅器の後置増幅部用制御回路同士の直接的な通信や、電気信号伝送路ＥＬ２を用いた、前置光増幅器２０の前置増幅部用制御回路２２を介した、後置光増幅器の後置増幅部用制御回路同士の通信が例示される。 In the optical transmission system 300, when one of the rear optical amplifiers 40-1 to 40-N fails and is replaced, the post-amplifier control circuit for the rear optical amplifier after replacement is replaced with another rear amplifier. It communicates with the control circuit for the post-amplifier of the post-amplifier, and acquires information data used for controlling the operation of the post-amplifier before replacement. As a communication mode, direct communication between the control circuits for the post-amplifier of the post-optical amplifier using the path EL3 and the pre-amplifier of the pre-optical amplifier 20 using the electric signal transmission line EL2 are used. The communication between the post-amplifier control circuits for the post-optical amplifier via the control circuit 22 is illustrated.
　この光伝送システム３００では、後置光増幅器４０－１～４０－Ｎが相互に通信し、データの送受信を行うので、より冗長性、信頼性が高い光伝送システムである。 In this optical transmission system 300, the rear optical amplifiers 40-1 to 40-N communicate with each other to transmit and receive data, so that the optical transmission system has higher redundancy and reliability.
（実施の形態４）
　図５は、本発明の実施の形態４に係る光伝送システムの模式的な構成図である。この光伝送システム４００は、以下の点において、光伝送システム１００とは異なっている。 (Embodiment 4)
FIG. 5 is a schematic configuration diagram of an optical transmission system according to Embodiment 4 of the present invention. The optical transmission system 400 is different from the optical transmission system 100 in the following points.
　すなわち、光伝送システム４００では、後置増幅部用制御回路４２－１～４２－Ｎのそれぞれが、後置光増幅器４０－１～４０－Ｎのそれぞれの動作を制御するために使用される情報のデータＤ２－１～Ｄ２－Ｎのすべて、および、前置光増幅器２０の動作を制御するために使用される情報のデータ（♯ＰＡで示す）を含むデータＤ３を記憶している。なお、前置増幅部用制御回路２２は、電気信号伝送路と電気コネクタとを介して後置増幅部用制御回路４２－１～４２－Ｎのそれぞれに接続しているが、図５では、前置増幅部用制御回路２２と後置増幅部用制御回路４２－２、４２－Ｎとを接続する電気信号伝送路ＥＬ４のみを示している。 That is, in the optical transmission system 400, each of the post-amplifier control circuits 42-1 to 42-N is used for controlling the operation of each of the post-optical amplifiers 40-1 to 40-N. Data D3 including all the data D2-1 to D2-N and information data (indicated by #PA) used for controlling the operation of the pre-amplifier 20 are stored. The preamplifier control circuit 22 is connected to each of the postamplifier control circuits 42-1 to 42-N via an electrical signal transmission line and an electrical connector, but in FIG. Only the electric signal transmission line EL4 for connecting the preamplifier control circuit 22 and the postamplifier control circuits 42-2 and 42-N is shown.
　この光伝送システム４００では、光伝送システム３００と同様に、後置光増幅器４０－１～４０－Ｎのいずれかが故障し、交換された場合に、交換後の後置光増幅器の後置増幅部用制御回路は、他の後置光増幅器の後置増幅部用制御回路と、前置光増幅器２０の前置増幅部用制御回路２２を介した通信を行い、交換前の後置光増幅器の動作を制御するために使用されていた情報のデータを取得する。 In this optical transmission system 400, as in the optical transmission system 300, when any of the rear optical amplifiers 40-1 to 40 -N fails and is replaced, the rear optical amplifier after the replacement is post-amplified. The part control circuit communicates with the other post-amplifier control circuit of the rear optical amplifier via the front amplifier control circuit 22 of the front optical amplifier 20, and the rear optical amplifier before replacement Get the data of information that was used to control the operation of the.
　さらに、光伝送システム４００では、前置光増幅器２０が故障し、交換された場合に、交換後の前置光増幅器の前置増幅部用制御回路は、後置光増幅器４０－１～４０－Ｎのいずれか（図５では後置光増幅器４０－２）の後置増幅部用制御回路と通信を行い、交換後の前置光増幅器の動作を制御するために使用される情報のデータを取得する。 Further, in the optical transmission system 400, when the pre-optical amplifier 20 fails and is replaced, the pre-amplifier control circuit of the pre-optical amplifier after replacement is replaced with the post-optical amplifiers 40-1 to 40-. N is communicated with the control circuit for the post-amplifier unit of N (the post-optical amplifier 40-2 in FIG. 5), and the data of the information used for controlling the operation of the post-optical amplifier after the exchange get.
　この光伝送システム４００では、後置光増幅器４０－１～４０－Ｎが相互に通信し、データの送受信を行うとともに、上位の前置光増幅器２０の制御に関する情報を、下位の後置光増幅器４０－１～４０－Ｎが有する構成とすることによって、冗長性、信頼性を高めている。 In this optical transmission system 400, the rear optical amplifiers 40-1 to 40-N communicate with each other to transmit and receive data, and information related to the control of the upper optical amplifier 20 is transmitted to the lower optical amplifiers. Redundancy and reliability are improved by employing the configuration of 40-1 to 40-N.
　ここで、前置光増幅器２０の動作を制御するために使用される情報としては、実施の形態１と同様に、たとえば、前置光増幅器２０の静特性、動特性、アラーム条件、または固有情報である。前置光増幅器２０の静特性、アラーム条件、固有情報は、実施の形態１で述べた後置光増幅器の静特性、アラーム条件、固有情報と同様の情報であってよい。 Here, as the information used for controlling the operation of the front optical amplifier 20, for example, the static characteristics, the dynamic characteristics, the alarm conditions, or the specific information of the front optical amplifier 20, as in the first embodiment. It is. The static characteristics, alarm conditions, and unique information of the front optical amplifier 20 may be the same information as the static characteristics, alarm conditions, and unique information of the rear optical amplifier described in the first embodiment.
　前置光増幅器２０の動特性に関する情報には、たとえば、前置光増幅器２０が交換された後の前置光増幅器２０の起動のタイミング、前置光増幅器２０のシャットダウンおよびその後の再起動のタイミングなどが含まれる。シャットダウンおよび再起動のタイミングの情報は、交換された前置光増幅器２０の前後に接続された光増幅器との動作タイミングの整合のために必要となる。この動作タイミングの整合は、たとえば、後置光増幅器がフラグとしてＯＦＦ状態を示すものを送信し、前置光増幅器２０が接続されたすべての後置光増幅器からＯＦＦ状態のフラグを受信した場合に、前置光増幅器２０が所定のタイミングの情報に従って起動、再起動またはシャットダウンすることにより行われる。また、この動作タイミングの整合は、たとえば、前置光増幅器２０のフラグの受信状態から、すべての後置光増幅器がＯＦＦ状態または接続されていないと認められる場合に、前置光増幅器２０が所定のタイミングの情報に従って起動、再起動またはシャットダウンすることにより行われてもよい。このように、動作タイミングの整合は、後置光増幅器がフラグを送信し、前置光増幅器２０がフラグを受信することにより実現される。このような動作タイミングの整合により、たとえば、後置光増幅器が前置光増幅器２０より先にＯＮ状態となることがないように、起動または再起動のタイミングの整合を行うことができる。 The information on the dynamic characteristics of the pre-amplifier 20 includes, for example, the start timing of the pre-amplifier 20 after the replacement of the pre-amplifier 20, the shutdown timing of the pre-amplifier 20 and the subsequent restart timing. Etc. are included. Information on the timing of shutdown and restart is necessary for matching the operation timing with the optical amplifiers connected before and after the replaced pre-amplifier 20. This operation timing matching is performed, for example, when the rear optical amplifier transmits a flag indicating the OFF state as a flag and receives the OFF state flag from all the rear optical amplifiers to which the front optical amplifier 20 is connected. This is done by starting, restarting or shutting down the pre-amplifier 20 according to information of a predetermined timing. Also, this operation timing matching is performed when, for example, the pre-optical amplifier 20 is set to a predetermined state when it is recognized from the reception state of the flag of the pre-optical amplifier 20 that all the post-optical amplifiers are OFF or not connected. It may be performed by starting, restarting or shutting down according to the timing information. Thus, the operation timing matching is realized by the post-optical amplifier transmitting the flag and the pre-optical amplifier 20 receiving the flag. By matching the operation timings, for example, the start or restart timing can be matched so that the rear optical amplifier is not turned ON before the front optical amplifier 20.
　なお、上記実施の形態に係る光増幅器の構成は例示である。光増幅器は、たとえば複数の励起レーザ素子を備える構成や、多段構成等でもよい。 The configuration of the optical amplifier according to the above embodiment is an example. The optical amplifier may have, for example, a configuration including a plurality of pump laser elements or a multistage configuration.
　また、上記実施の形態では、前置光増幅器と後置光増幅器で構成されているが、後置光増幅器の出力側にさらに光分配器と複数の後置光増幅器とを接続してもよい。 Further, in the above embodiment, the optical amplifier is composed of a front optical amplifier and a rear optical amplifier, but an optical distributor and a plurality of rear optical amplifiers may be further connected to the output side of the rear optical amplifier. .
　また、上記実施の形態では、データの通信を、電気信号伝送路を介して行っているが、無線や光信号にて通信をおこなってもよい。 In the above embodiment, data communication is performed via an electric signal transmission path, but communication may be performed by radio or optical signal.
　また、上記実施の形態では、分岐した光伝送路上に配置されている光伝送装置としては、おもに光増幅器であるが、他の光伝送装置に適宜置き換えてもよい。また、異なる種類の光伝送装置が混在して配置されていてもよい。 In the above embodiment, the optical transmission device arranged on the branched optical transmission line is mainly an optical amplifier, but may be appropriately replaced with another optical transmission device. Further, different types of optical transmission devices may be mixed and arranged.
　また、上記実施の形態により本発明が限定されるものではない。上述した各構成要素を適宜組み合わせて構成したものも本発明に含まれる。また、さらなる効果や変形例は、当業者によって容易に導き出すことができる。よって、本発明のより広範な態様は、上記の実施の形態に限定されるものではなく、様々な変更が可能である。 Further, the present invention is not limited by the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.
　以上のように、本発明に係る光伝送システムは、光通信の分野に利用して好適なものである。 As described above, the optical transmission system according to the present invention is suitable for use in the field of optical communications.
　１０　光入力ポート
　２０　前置光増幅器
　２１　前置増幅部
　２１ａ、２１ｆ　光カプラ
　２１ｂ、２１ｇ　光検出器
　２１ｃ　波長多重合分波カプラ
　２１ｄ　励起レーザ素子
　２１ｅ　増幅用光ファイバ
　２２　前置増幅部用制御回路
　２２ａ　デジタル／アナログ変換部
　２２ｂ　アナログ／デジタル変換部
　２２ｃ　演算処理部
　２２ｄ　記憶部
　２２ｅ　入出力部
　３０　光分配器
　４０－１～４０－Ｎ　後置光増幅器
　４１－１～４１－Ｎ　後置増幅部
　４２－１～４２－Ｎ　後置増幅部用制御回路
　５０－１～５０－Ｎ　光出力ポート
　６０－１～６０－Ｎ　光コネクタ
　７０－１～７０－Ｎ　電気コネクタ
　８０　上位ネットワークエレメント
　１００、２００、３００、４００　光伝送システム
　Ｄ１　データ
　Ｄ２－１～Ｄ２―Ｎ　データ
　Ｄ３　データ
　ＥＬ１、ＥＬ２、ＥＬ４　電気信号伝送路
　ＥＬ３　経路
　ＰＣ　パーソナルコンピュータ DESCRIPTION OF SYMBOLS 10 Optical input port 20 Pre-amplifier 21 Pre-amplifier 21a, 21f Optical coupler 21b, 21g Photo detector 21c Wavelength multiple polymerization demultiplexer coupler 21d Excitation laser element 21e Amplifying optical fiber 22 Pre-amplifier control circuit 22a Digital / analog conversion unit 22b Analog / digital conversion unit 22c Arithmetic processing unit 22d Storage unit 22e Input / output unit 30 Optical distributors 40-1 to 40-N Post-optical amplifiers 41-1 to 41-N Post-amplifiers 42- 1 to 42-N Post-amplifier control circuit 50-1 to 50-N Optical output port 60-1 to 60-N Optical connector 70-1 to 70-N Electrical connector 80 Host network element 100, 200, 300, 400 Optical transmission system D1 data D2-1 to D2-N data D3 data EL1, EL2, EL4 Electric signal transmission Road EL3 route PC personal computer

Claims (8)

  1. 　分岐した光伝送路上に、交換可能に構成された複数の光伝送装置が配置され、
    　前記複数の光伝送装置は、第１光伝送装置と第２光伝送装置とを含み、
    　前記第１光伝送装置は、前記第１光伝送装置の動作を制御する第１制御部を有し、
    　前記第２光伝送装置は、前記第２光伝送装置の動作を制御する第２制御部を有し、前記第２制御部は、前記第１制御部が前記第１光伝送装置を制御するために使用する基準となる情報のデータを記憶しており、前記第１制御部と相互に通信を行って前記データを前記第１制御部に送信するように構成されていることを特徴とする光伝送システム。     On the branched optical transmission line, a plurality of optical transmission devices configured to be replaceable are arranged,
    The plurality of optical transmission devices include a first optical transmission device and a second optical transmission device,
    The first optical transmission device has a first control unit that controls the operation of the first optical transmission device;
    The second optical transmission device includes a second control unit that controls the operation of the second optical transmission device, and the second control unit is configured so that the first control unit controls the first optical transmission device. The data of the information used as the reference | standard used for this is memorize | stored, It communicates with the said 1st control part, and it is comprised so that the said data may be transmitted to the said 1st control part Transmission system.
  2. 　前記第２制御部は、前記第１制御部からの要求に従って前記データを送信することを特徴とする請求項１に記載の光伝送システム。 The optical transmission system according to claim 1, wherein the second control unit transmits the data according to a request from the first control unit.
  3. 　前記複数の光伝送装置は、後置光伝送装置と、前記光伝送路上において前記後置光伝送装置よりも上位に位置する前置光伝送装置とを含み、
    　前記第１光伝送装置は、前記後置光伝送装置であり、前記第２光伝送装置は、前記前置光伝送装置であることを特徴とする請求項１または２に記載の光伝送システム。     The plurality of optical transmission devices include a rear optical transmission device, and a front optical transmission device positioned higher than the rear optical transmission device on the optical transmission path,
    3. The optical transmission system according to claim 1, wherein the first optical transmission device is the rear optical transmission device, and the second optical transmission device is the front optical transmission device. 4.
  4. 　前記複数の光伝送装置は、後置光伝送装置と、前記光伝送路上において前記後置光伝送装置よりも上位に位置する前置光伝送装置とを含み、
    　前記第１光伝送装置は、前記前置光伝送装置であり、前記第２光伝送装置は、前記後置光伝送装置であることを特徴とする請求項１または２に記載の光伝送システム。     The plurality of optical transmission devices include a rear optical transmission device, and a front optical transmission device positioned higher than the rear optical transmission device on the optical transmission path,
    The optical transmission system according to claim 1, wherein the first optical transmission device is the front optical transmission device, and the second optical transmission device is the rear optical transmission device.
  5. 　前記複数の光伝送装置は、複数の後置光伝送装置と、前記光伝送路上において前記複数の後置光伝送装置よりも上位に位置する前置光伝送装置とを含み、
    　前記第１光伝送装置および前記第２光伝送装置は、前記複数の後置光伝送装置に含まれることを特徴とする請求項１または２に記載の光伝送システム。     The plurality of optical transmission devices include a plurality of rear optical transmission devices and a front optical transmission device positioned above the plurality of rear optical transmission devices on the optical transmission path,
    The optical transmission system according to claim 1, wherein the first optical transmission device and the second optical transmission device are included in the plurality of rear optical transmission devices.
  6. 　前記複数の光伝送装置は、複数の後置光伝送装置と、前記光伝送路上において前記複数の後置光伝送装置よりも上位に位置する前置光伝送装置と、前記前置光伝送装置よりもさらに上位に位置する上位光伝送装置とを含み、
    　前記第１光伝送装置は、前記上位光伝送装置であり、前記第２光伝送装置は、前記前置光伝送装置または前記後置光伝送装置であることを特徴とする請求項１または２に記載の光伝送システム。     The plurality of optical transmission devices includes a plurality of rear optical transmission devices, a front optical transmission device positioned higher than the plurality of rear optical transmission devices on the optical transmission path, and the front optical transmission device. Including a higher-order optical transmission device located at a higher level,
    The first optical transmission device is the higher-order optical transmission device, and the second optical transmission device is the front optical transmission device or the rear optical transmission device. The optical transmission system described.
  7. 　前記基準となる情報は、前記第１光伝送装置の静特性、動特性、アラーム条件、または固有情報の情報と、該情報と関連付けられた、前記第１光伝送装置を特定するための位置情報とを含むことを特徴とする請求項１～６のいずれか一つに記載の光伝送システム。 The reference information includes information on static characteristics, dynamic characteristics, alarm conditions, or specific information of the first optical transmission apparatus, and position information for specifying the first optical transmission apparatus associated with the information. The optical transmission system according to any one of claims 1 to 6, further comprising:
  8. 　前記複数の光伝送装置は光増幅器を含むことを特徴とする請求項１～７のいずれか一つに記載の光伝送システム。 8. The optical transmission system according to claim 1, wherein the plurality of optical transmission devices include an optical amplifier.
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