WO2011158283A1 - Optical transmission system - Google Patents

Optical transmission system Download PDF

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Publication number
WO2011158283A1
WO2011158283A1 PCT/JP2010/003945 JP2010003945W WO2011158283A1 WO 2011158283 A1 WO2011158283 A1 WO 2011158283A1 JP 2010003945 W JP2010003945 W JP 2010003945W WO 2011158283 A1 WO2011158283 A1 WO 2011158283A1
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WO
WIPO (PCT)
Prior art keywords
optical
power supply
light
optical transmission
station device
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PCT/JP2010/003945
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French (fr)
Japanese (ja)
Inventor
清水良浩
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富士通テレコムネットワークス株式会社
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Application filed by 富士通テレコムネットワークス株式会社 filed Critical 富士通テレコムネットワークス株式会社
Priority to JP2012520154A priority Critical patent/JP5536209B2/en
Priority to PCT/JP2010/003945 priority patent/WO2011158283A1/en
Publication of WO2011158283A1 publication Critical patent/WO2011158283A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/806—Arrangements for feeding power
    • H04B10/807—Optical power feeding, i.e. transmitting power using an optical signal

Definitions

  • the present invention relates to an optical transmission system that transmits and receives optical signals via an optical transmission line.
  • the optical power level transmitted to the slave station device decreases, and sufficient power is supplied to the slave station device. May not be supplied. Insufficient power in the slave station device may affect the reliability of the system.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide an optical transmission system capable of supplying sufficient power from a master station device to a slave station device via an optical transmission path. .
  • an optical transmission system includes an optical transmitter that outputs main signal light, a power supply light source that outputs power supply light different from the main signal light, An optical amplifier that amplifies signal light and power supply light, an optical transmission line that transmits main signal light and power supply light from the master station device, and photoelectric conversion of the power supply light. And a slave station device that performs reception processing of the main signal light using the generated power.
  • power is supplied to the slave station device by transmitting the power supply light different from the main signal light from the master station device to the slave station device via the optical transmission line and performing photoelectric conversion.
  • the device can be installed by introducing only the optical transmission line fiber.
  • an optical amplifier is provided in the master station apparatus to amplify the power supply light.
  • the main signal light and the power supply light may have different wavelengths.
  • the master station device may further include an optical multiplexer that combines the main signal light and the power supply light, and the optical amplifier may collectively amplify the wavelength multiplexed light from the optical multiplexer.
  • the optical amplifier is provided at the subsequent stage of the optical transmitter and the power supply light source, and the master station device further includes an optical multiplexer that combines the amplified main signal light and the power supply light. Also good.
  • the relay station apparatus further includes a relay station apparatus disposed between the master station apparatus and the slave station apparatus, and the power supply light includes a first power supply light having a first wavelength and a second wavelength having a second wavelength different from the first wavelength.
  • the optical multiplexer outputs wavelength multiplexed light obtained by combining the main signal light, the first power supply light, and the second power supply light, and the relay station device outputs the first signal from the wavelength multiplexed light.
  • a relay station power supply device, and the slave station device is a second optical switch that separates the second power supply light from the wavelength multiplexed light from the relay station device, and an optical receiver that performs a reception process of the main signal light
  • an intra-slave power supply device that photoelectrically converts the second power supply light and supplies power to the optical receiver; It may be provided.
  • the optical transmission line is redundantly composed of a working optical transmission line and a standby optical transmission line, and the master station device and the slave station device are optical devices operated between the working optical transmission line and the standby optical transmission line.
  • the optical switch further includes an optical switch for switching the transmission line, and the optical switch transmits the main signal light to the active optical transmission line and the power supply light to the standby optical transmission line during normal operation.
  • the optical transmission line may be switched so that the main signal light is transmitted through the standby optical transmission line when a failure occurs in the active optical transmission line.
  • the slave station device further includes a charging device that charges electric power obtained by photoelectrically converting the power supply light during normal operation, and uses a power charged in the charging device when a failure occurs in the active optical transmission line.
  • the main signal light may be received.
  • the master station device and the slave station device may be arranged as terminal devices in a point-to-point network. Further, the master station device and the slave station device may be arranged as terminal devices in the optical ring network.
  • an optical transmission system capable of supplying sufficient power from a master station device to a slave station device via an optical transmission path.
  • FIG. 5 is a diagram for explaining a transmission path when a failure occurs in an active optical transmission path in the optical transmission system of FIG. 4. It is a figure for demonstrating the optical transmission system which concerns on another embodiment of this invention.
  • FIG. 7 is a diagram for explaining a transmission path when a failure occurs in an active optical transmission path in the optical transmission system of FIG. 6. It is a figure for demonstrating the wavelength used as main signal light and electric power supply light.
  • FIG. 1 is a diagram for explaining an optical transmission system according to an embodiment of the present invention.
  • An optical transmission system 100 illustrated in FIG. 1 connects a master station device 10 that transmits a modulated main signal light, a slave station device 20 that receives the main signal light, and the master station device 10 and the slave station device 20.
  • An optical transmission line 40 and a relay station device 30 arranged between the master station device 10 and the slave station device 20 are provided.
  • the optical transmission system 100 multiplexes a plurality of main signal lights having different wavelengths and transmits them between a master station device 10 and a slave station device 20 via an optical transmission line 40, and performs point-to-point WDM optical transmission. System.
  • the master station device 10 includes n (n is an arbitrary integer greater than or equal to 1) optical transmitters OS1 to OSn, and mn (m is an arbitrary integer greater than n) power supply light sources LDn + 1 to LDm. , Optical transmitters OS1 to OSn and power supply light sources LDn + 1 to LDm, an optical multiplexer 12 provided at the subsequent stage, and a master optical amplifier 14 provided at the subsequent stage of the optical multiplexer 12.
  • Each of the optical transmitters OS1 to OSn converts the input client signal into a frame, performs a predetermined transmission process such as adding an error correction code, and then outputs the main signal light (wavelengths ⁇ 1 to ⁇ n).
  • the wavelengths ⁇ 1 to ⁇ n of the main signal light are different from each other.
  • the power supply light sources LDn + 1 to LDm output power supply light (wavelengths ⁇ n + 1 to ⁇ m) different from the main signal light of wavelengths ⁇ 1 to ⁇ n, respectively.
  • the power supply light sources LDn + 1 to LDm for example, laser diodes can be used.
  • the wavelengths ⁇ n + 1 to ⁇ m of the power supply light are different from the wavelengths ⁇ 1 to ⁇ n of the main signal.
  • the optical multiplexer 12 combines the main signal light having the wavelengths ⁇ 1 to ⁇ n and the power supply light having the wavelengths ⁇ n + 1 to ⁇ m to generate wavelength multiplexed light, which is output to the master optical amplifier 14.
  • the master optical amplifier 14 collectively amplifies the wavelength multiplexed light from the optical multiplexer 12 and outputs it to the optical transmission line 40.
  • an erbium-doped optical fiber amplifier (EDFA), a semiconductor optical amplifier (SOA), or the like can be used as the master optical amplifier 14.
  • a power line from the outside of the apparatus is connected to the master station apparatus 10, and various devices in the master station apparatus 10 operate with power supplied from the power line.
  • the optical transmission line 40 transmits the wavelength division multiplexed light of the main signal light and the power supply light amplified by the master optical amplifier 14 of the master station device 10 to the slave station device 20.
  • a single mode optical fiber can be used as the optical transmission line 40.
  • the repeater station device 30 includes a repeater optical amplifier 32 that amplifies the wavelength multiplexed light attenuated during propagation in the optical transmission line 40 and outputs the amplified light to the slave station device 20.
  • the relay station device 30 is connected to a power line from the outside of the device, and the repeater optical amplifier 32 in the relay station device 30 operates with power supplied from the power line.
  • the slave station device 20 includes an optical demultiplexer 22 connected to the optical transmission line 40, n optical receivers OR 1 to ORn provided at the subsequent stage of the optical demultiplexer 22, and the optical demultiplexer 22. There are provided mn photoelectric converters OEn + 1 to OEm provided in the subsequent stage and a power supply device 24 in the slave station. In the present embodiment, the slave station device 20 is not connected to a power line from the outside of the device.
  • the optical demultiplexer 22 demultiplexes the wavelength multiplexed light transmitted through the optical transmission path 40 into main signal light with wavelengths ⁇ 1 to ⁇ n and power supply light with wavelengths ⁇ n + 1 to ⁇ m.
  • an array type waveguide diffraction grating (AWG), fiber grading, a dielectric multilayer film, or the like can be used as the optical multiplexer 12 and the optical demultiplexer 22.
  • the main signal lights of wavelengths ⁇ 1 to ⁇ n are received by the optical receivers OR1 to ORn, respectively, are subjected to predetermined reception processing such as photoelectric conversion, timing extraction, identification reproduction and error correction, and then output as client signals. .
  • power supply lights having wavelengths ⁇ n + 1 to ⁇ m are photoelectrically converted by photoelectric converters OEn + 1 to OEm, respectively.
  • photodiodes can be used as the photoelectric converters OEn + 1 to OEm.
  • the electric power output from each of the photoelectric converters OEn + 1 to OEm is sent to the power supply device 24 in the slave station.
  • the slave station power supply device 24 supplies the power sent from the photoelectric converters OEn + 1 to OEm to various devices in the slave station device 20.
  • the optical receivers OR1 to ORn perform the above-described reception process using the power from the intra-stationary power supply device 24.
  • the power supply light different from the main signal light is transmitted from the master station device 10 to the slave station device 20 via the optical transmission path 40, It becomes possible to supply electric power to the slave station device 20 by performing the photoelectric conversion. Thereby, for example, even when the slave station device 20 is installed in a place where the power line is not installed, the device can be installed by introducing only the optical transmission line fiber.
  • the master station optical amplifier 14 is provided in the master station apparatus 10, and the repeater optical amplifier 32 is provided in the repeater station apparatus 30. Accordingly, even when the optical transmission line 40 is long and has a large loss, it is possible to transmit a large optical power and supply stable power to the slave station device 20.
  • FIG. 2 is a diagram for explaining an optical transmission system according to another embodiment of the present invention.
  • the optical transmission system 100 shown in FIG. 2 connects the master station device 10 that transmits the modulated main signal light, the slave station device 20 that receives the main signal light, and the master station device 10 and the slave station device 20.
  • An optical transmission line 40 and a relay station device 30 arranged between the master station device 10 and the slave station device 20 are provided.
  • This optical transmission system 100 is also a point-to-point WDM optical transmission system.
  • the master station apparatus 10 is provided in the subsequent stage of n optical transmitters OS1 to OSn (n is an arbitrary integer equal to or greater than 1), two power supply light sources LDn + 1 and LDn + 2, and optical transmitters OS1 to OSn.
  • a master optical amplifier 15 provided.
  • the optical transmitters OS1 to OSn output main signal lights having wavelengths ⁇ 1 to ⁇ n, respectively.
  • the power supply light source LDn + 1 outputs first power supply light having a predetermined first wavelength ⁇ n + 1, and the power supply light source LDn + 2 outputs second power supply light having a predetermined second wavelength ⁇ n + 2.
  • the first wavelength ⁇ n + 1 and the second wavelength ⁇ n + 2 are different wavelengths.
  • the main signal light from the optical transmitters OS 1 to OSn is multiplexed by the optical multiplexer 12 and then amplified by the master optical amplifier 14.
  • the first power supply light and the second power supply light are combined by the optical multiplexer 13 and then amplified by the master optical amplifier 15.
  • the main signal light, the first power supply light, and the second power supply light output from the master optical amplifiers 14 and 15 are combined by the coupler 17 and then sent to the optical transmission line 40.
  • the relay station device 30 includes an optical switch 34 that receives wavelength-multiplexed light from the optical transmission line 40, a relay optical amplifier 32 that is provided at the subsequent stage of the optical switch, and a photoelectric converter OEn + 1 that receives light separated by the optical switch 34. And a relay station power supply device 36.
  • a wavelength selective switch (WSS: Wave Selectable Switch) can be used as the optical switch.
  • the relay station device 30 is not connected to a power line from the outside of the device.
  • the optical switch 34 separates the first power supply light having the wavelength ⁇ n + 1 from the received wavelength multiplexed light.
  • the separated first power supply light is sent to the photoelectric converter OEn + 1.
  • the main signal light of wavelengths 1 to ⁇ n and the second power supply light of wavelength ⁇ n + 2 are sent to the repeater optical amplifier 32.
  • the first power supply light having the wavelength ⁇ n + 1 is photoelectrically converted by the photoelectric converter OEn + 1.
  • the power output from the photoelectric converter OEn + 1 is sent to the relay station power supply device 36.
  • the relay station power supply device 36 supplies the power from the photoelectric converter OEn + 1 to various devices in the relay station device 30.
  • the repeater optical amplifier 32 amplifies the wavelength multiplexed light of wavelengths ⁇ 1 to ⁇ n and ⁇ n + 2 using the power from the relay station power supply device 36.
  • the amplified wavelength multiplexed light is sent to the slave station device 20.
  • the slave station device 20 includes an optical switch 26 connected to the optical transmission line 40, a slave station optical amplifier 28 provided at the subsequent stage of the optical switch 26, and an optical demultiplexer provided at the subsequent stage of the slave station optical amplifier 28. 22, n optical receivers OR 1 to ORn provided in the subsequent stage of the optical demultiplexer 22, a photoelectric converter OEn + 2 that receives the light separated by the optical switch 26, and a sub-station power supply device 24. .
  • the slave station device 20 is not connected to a power line from the outside of the device.
  • the optical switch 26 separates the second power supply light having the second wavelength ⁇ n + 2 from the received wavelength multiplexed light.
  • the separated second power supply light is sent to the photoelectric converter OEn + 2.
  • the main signal light of wavelengths 1 to ⁇ n is sent to the slave optical amplifier 28.
  • the main signal light of wavelengths 1 to ⁇ n is demultiplexed by the optical demultiplexer 22 and then received by the optical receivers OR1 to ORn, and predetermined reception processing such as photoelectric conversion, timing extraction, identification reproduction, error correction, and the like is performed. After being performed, it is output as a client signal.
  • the second power supply light is photoelectrically converted by the photoelectric converter OEn + 2.
  • the power output from the photoelectric converter OEn + 2 is sent to the slave station power supply device 24.
  • the slave station power supply device 24 supplies the power from the photoelectric converter OEn + 2 to various devices in the slave station device 20.
  • the slave station power supply device 24 supplies power for operation to the slave station optical amplifier 28, the optical receivers OR1 to ORn, and the like.
  • the first power supply light having the first wavelength ⁇ n + 1 is transmitted from the master station device 10 to the relay station device 30 and is relayed by performing photoelectric conversion. Power can be supplied to the station device 30.
  • the second station power supply light having the second wavelength ⁇ n + 2 is transmitted from the master station apparatus 10 to the slave station apparatus 20, and power can be supplied to the slave station apparatus 20 by performing photoelectric conversion.
  • the master station optical amplifier 15 is provided in the master station apparatus 10. As a result, even when the optical transmission line 40 is long and has a large loss, it is possible to transmit a large optical power and supply stable power to the slave station device 20 and the relay station device 30.
  • FIG. 3 is a diagram for explaining a modification of the master station device.
  • optical amplifiers AP1 to APn are respectively provided after the optical transmitters OS1 to OSn. Further, optical amplifiers APn + 1 to APm are provided at the subsequent stage of the power supply light sources LDn + 1 to LDm.
  • An optical multiplexer 12 is provided at the subsequent stage of the optical amplifiers AP1 to APn and the optical amplifiers APn + 1 to APm, and the main signal light and the power supply light are combined by the optical multiplexer 12.
  • FIG. 4 is a diagram for explaining an optical transmission system according to still another embodiment of the present invention.
  • the optical transmission system 100 shown in FIG. 4 connects the master station device 10 that transmits the modulated main signal light, the slave station device 20 that receives the main signal light, and the master station device 10 and the slave station device 20. And an optical transmission line 40.
  • This optical transmission system 100 is also a point-to-point WDM optical transmission system.
  • the master station device 10 includes n optical transmitters OS1 to OSn, n power supply light sources LD1 to LDn, an optical multiplexer 12 provided at the subsequent stage of the optical transmitters OS1 to OSn, and a power supply unit.
  • An optical multiplexer 13 provided downstream of the light sources LD1 to LDn, an optical switch 16 provided downstream of the optical multiplexers 12, 13, and a master optical amplifier 14 provided in parallel downstream of the optical switch 16, 15.
  • the wavelength bands ⁇ 1 to ⁇ n of light output from the optical transmitters OS1 to OSn and the power supply light sources LD1 to LDn are set to be the same, but may be different.
  • the optical transmission line 40 is redundantly configured by an active optical transmission line 41 and a standby optical transmission line 42.
  • Each of the working optical transmission line 41 and the standby optical transmission line 42 has one end connected to the optical switch 16 of the master station device 10 and the other end connected to the optical switch 26 of the slave station device 20.
  • the master optical amplifier 14 is provided on the working optical transmission line 41, and the master optical amplifier 15 is provided on the standby optical transmission line 42.
  • the slave station device 20 includes an optical switch 26 connected to the working optical transmission line 41 and the standby optical transmission line 42, optical demultiplexers 22 and 23 provided at the subsequent stage of the optical switch 26, and an optical demultiplexer. 22, n optical receivers OR1 to ORn provided in the subsequent stage, n photoelectric converters OE1 to OEn provided in the subsequent stage of the optical demultiplexer 23, the sub-station power supply device 24, and the charging device 25.
  • the optical switch 16 of the master station device 10 and the optical switch 26 of the slave station device 20 perform switching of the optical transmission line to be operated between the active optical transmission line 41 and the standby optical transmission line 42.
  • the slave station device 20 is not connected to a power line from the outside of the device.
  • FIG. 4 the transmission paths of the main signal light and the power supply light during normal operation are indicated by bold lines.
  • the main signal lights of wavelengths ⁇ 1 to ⁇ n output from the optical transmitters OS 1 to OSn are combined by the optical multiplexer 12 and then input to the optical switch 16.
  • the wavelengths ⁇ 1 to ⁇ n output from the power supply light sources LD1 to LDn are combined by the optical multiplexer 13 and then output to the optical switch 16.
  • the optical switch 16 outputs the wavelength multiplexed light of the main signal light having the wavelengths ⁇ 1 to ⁇ n to the working optical transmission line 41 and the wavelength multiplexed light of the power supply light having the wavelengths ⁇ 1 to ⁇ n to the standby optical transmission.
  • the output is set to the path 42.
  • the wavelength multiplexed light of the main signal light having the wavelengths ⁇ 1 to ⁇ n is amplified by the master optical amplifier 14, and the wavelength multiplexed light of the power supply light having the wavelengths ⁇ 1 to ⁇ n is amplified by the master optical amplifier 15.
  • the wavelength multiplexed light of the main signal light transmitted through the active optical transmission line 41 and the wavelength multiplexed light of the power supply light transmitted through the standby optical transmission line 42 are input to the optical switch 26.
  • the optical switch 26 is set to output the wavelength multiplexed light of the main signal light to the optical demultiplexer 22 and to output the wavelength multiplexed light of the power supply light to the optical demultiplexer 23.
  • the main signal lights having wavelengths ⁇ 1 to ⁇ n demultiplexed by the optical demultiplexer 22 are received by the optical receivers OR1 to ORn, and predetermined reception processing such as photoelectric conversion, timing extraction, identification reproduction, and error correction is performed. After that, it is output as a client signal.
  • the power supply light having the wavelengths ⁇ 1 to ⁇ n demultiplexed by the optical demultiplexer 23 is photoelectrically converted by the photoelectric converters OE1 to OEn.
  • the photoelectrically converted power is sent to the power supply device 24 in the slave station.
  • the slave station power supply device 24 supplies the power from the photoelectric converters OE1 to OEn to various devices in the slave station device 20.
  • the slave station power supply device 24 supplies power for operation to the optical receivers OR1 to ORn.
  • the slave station power supply device 24 outputs a part of the power from the photoelectric converters OE1 to OEn to the charging device 25.
  • the charging device 25 charges the power supplied from the slave station power supply device 24 during normal operation.
  • FIG. 5 is a diagram for explaining a transmission path when a failure occurs in the working optical transmission path.
  • the optical switch 16 switches the transmission path so that the wavelength multiplexed light of the main signal light having the wavelengths ⁇ 1 to ⁇ n is output to the standby optical transmission line 42.
  • the optical switch 26 switches the path so that the wavelength division multiplexed light of the main signal light transmitted through the backup optical transmission path 42 is input to the optical demultiplexer 22.
  • the charging device 25 supplies the power charged during normal operation to the power supply device 24 in the slave station.
  • the slave station power supply device 24 supplies the power supplied from the charging device 25 to the optical receivers OR1 to ORn. By using this power, the main signal light can be received even when a failure occurs.
  • the power supply light different from the main signal light is transmitted from the master station device 10 via the optical transmission line 40 during the normal operation. It is possible to supply electric power to the slave station device 20 by transmitting to 20 and performing photoelectric conversion.
  • the master station optical amplifier 15 for amplifying the power supply light is provided in the master station apparatus 10, even when the standby optical transmission line 42 is long and has a large loss, a large optical power is transmitted to the slave station. Stable power can be supplied to the station apparatus 20.
  • the optical transmission system 100 even when a failure occurs in the working optical transmission line 41, the transmission path of the main signal light is switched and the electric power charged in the charging device 25 is supplied. By using it, the main signal light can be reliably transmitted.
  • the reliability of the apparatus can be improved, and the standby optical transmission line 42 can be effectively utilized during normal operation.
  • FIG. 6 is a diagram for explaining an optical transmission system according to still another embodiment of the present invention.
  • the optical transmission system 100 shown in FIG. 6 constitutes an optical ring network.
  • a plurality of terminal devices are connected to each other via an optical transmission line to form a ring-shaped optical communication network.
  • FIG. 6 shows an optical ring network in which master station devices 10a and 10b and a slave station device 20 are arranged as terminal devices. Note that the configurations of the master station devices 10a and 10b and the slave station device 20 are substantially the same as those shown in FIG. 5, and thus detailed description is omitted and some components are not shown.
  • the transmission paths of the main signal light and the power supply light during normal operation are indicated by arrows.
  • the optical switch 16 outputs the wavelength-multiplexed light of the main signal light having the wavelengths ⁇ 1 to ⁇ n to the working optical transmission line 41 and the first power supply light having the first wavelength ⁇ 1 as the standby optical transmission line. 42 is set to output.
  • the wavelength multiplexed light of the main signal light is amplified by the master optical amplifier 14 and then transmitted counterclockwise through the working optical transmission line 41 to reach the slave station device 20.
  • the first power supply light is amplified by the master optical amplifier 15 and then transmitted clockwise through the backup optical transmission line 42 to reach the slave station device 20.
  • the wavelength multiplexed light of the main signal light transmitted through the working optical transmission line 41 and the first power supply light transmitted through the standby optical transmission line 42 are input to the optical switch 26.
  • the optical switch 26 is set so that the wavelength-multiplexed light of the main signal light is input to an optical receiver (not shown) and the first power supply light is input to the photoelectric converter OE.
  • the slave station power supply device 24 supplies the power from the photoelectric converter OE to various devices in the slave station device 20 and stores a part of the power in the charging device 25.
  • the second power supply light having the second wavelength ⁇ 2 is output from the master station device 10b arranged in the middle of the standby optical transmission line 42. .
  • the second power supply light is combined with the first power supply light, and then transmitted to the slave station device 20 via the standby optical transmission line 42.
  • the electric power obtained by photoelectrically converting the second electric power supply light is also supplied to various devices in the slave station device 20, and a part of the electric power is stored in the charging device 25.
  • FIG. 7 is a diagram for explaining a transmission path when a failure occurs in the active optical transmission path.
  • the optical switch 16 switches the transmission path so that the wavelength multiplexed light of the main signal light having the wavelengths ⁇ 1 to ⁇ n is output to the standby optical transmission line 42.
  • the optical switch 26 switches the path so that the wavelength-multiplexed light of the main signal light transmitted through the backup optical transmission path 42 is input to the optical receiver.
  • the master station device 10b stops the multiplexing of the second power supply light.
  • the charging device 25 supplies the power charged during normal operation to the power supply device 24 in the slave station.
  • the slave station power supply device 24 supplies the power supplied from the charging device 25 to an optical receiver or the like. By using this power, the main signal light can be received even when a failure occurs.
  • the first power supply light from the master station device 10a is transmitted to the slave station device 20 via the optical transmission line 40 during normal operation.
  • the power can be supplied to the slave station device 20 by performing photoelectric conversion.
  • the master station optical amplifier 15 that amplifies the first power supply light is provided in the master station apparatus 10a, even when the standby optical transmission line 42 is long and has a large loss, it transmits a large optical power. Stable power can be supplied to the slave station device 20.
  • the main signal light is switched by switching the transmission path of the main signal light and using the power charged in the charging device 25. It is possible to reliably transmit light.
  • the reliability of the apparatus can be improved, and the standby optical transmission line 42 can be effectively used during normal operation.
  • the optical ring network since the optical ring network is configured, the second power supply light from the master station device 10b located in the middle of the standby optical transmission line 42 is multiplexed to the slave station device 20. Can be transmitted. Thereby, the electric power supplied to the slave station apparatus 20 can be increased.
  • the optical ring network is configured, even if a failure such as a disconnection occurs in the backup optical transmission line 42 between the master station devices 10a and 10b, the second The power supply light can be transmitted to the slave station device 20. Thereby, since the situation where power is not supplied to the slave station device 20 can be avoided, the reliability of the device can be further improved.
  • FIG. 8 is a diagram for explaining wavelengths used as main signal light and power supply light.
  • FIG. 8 is a diagram illustrating loss characteristics of the transmission line fiber.
  • the wavelengths ⁇ n + 1 to ⁇ m of the power supply light are ITU-Grid wavelengths within L-band (1570 nm to 1610 nm) can be used.
  • the ITU-Grid wavelength in the L-band may be used as the wavelengths ⁇ 1 to ⁇ n of the main signal light
  • the ITU-Grid wavelength in the C-band may be used as the wavelengths ⁇ n + 1 to ⁇ m of the power supply light.
  • the ITU-Grid wavelength in the C-band may be used as the wavelengths ⁇ 1 to ⁇ n of the main signal light and the power supply light, or the L-band.
  • the ITU-Grid wavelength may be used.
  • the transmission distance per span is 15 km
  • the transmission line fiber loss is 0.2 dB / km
  • the power from the master station device is
  • the output optical power of the power supply light is 10 dBm
  • the input optical power of the slave station apparatus can obtain power of about 7 dBm (5 mW).
  • the present invention can be used in an optical transmission system that transmits and receives an optical signal through an optical transmission line.

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

Provided is an optical transmission system which makes it possible to supply sufficient electrical power from a parent device to a child device via an optical transmission line. An optical transmission system (100) is provided with a parent device (10), a child device (20), and an optical transmission line (40). The parent device (10) is provided with optical transmitters (OS1 to OSn) for outputting main signal light, electrical power supplying light sources (LDn + 1 to LDm) for outputting electrical power supplying light separately from the main signal light, and a parent device optical amplifier (14) for amplifying the main signal light and the electrical power supplying light. A relay station device (30) transmits the main signal light and the electrical power supplying light from the parent device (10). The child device (20) handles the receiving of the main signal light by using the electrical power obtained by means of the photoelectric conversion of the electrical power supplying light.

Description

光伝送システムOptical transmission system
　本発明は、光伝送路を介して光信号の送受信を行う光伝送システムに関する。 The present invention relates to an optical transmission system that transmits and receives optical signals via an optical transmission line.
　従来より、光伝送システムの親局装置から遠隔地の子局装置へ光ファイバを介して電力を供給することで、子局側において電源確保を不要とする光給電技術が提案されている（例えば、特許文献１参照）。 2. Description of the Related Art Conventionally, an optical power feeding technique has been proposed in which power is not required on the slave station side by supplying power via an optical fiber from a master station device of an optical transmission system to a remote slave station device (for example, , See Patent Document 1).
特開２００５－１９８３９６号公報JP 2005-198396 A
　光給電技術においては、光ファイバを長距離化した場合や、多段中継によるファイバ接続損失が増大した場合に、子局装置に伝達される光パワーレベルが低下し、子局装置に十分な電力が供給されない可能性がある。子局装置における電力の不足は、システムの信頼性に影響を及ぼすおそれがある。 In the optical power feeding technology, when the optical fiber is extended or when the fiber connection loss due to multi-stage relay increases, the optical power level transmitted to the slave station device decreases, and sufficient power is supplied to the slave station device. May not be supplied. Insufficient power in the slave station device may affect the reliability of the system.
　本発明はこうした状況に鑑みてなされたものであり、その目的は、親局装置から子局装置へ光伝送路を介して十分な電力を供給することのできる光伝送システムを提供することにある。 The present invention has been made in view of such circumstances, and an object thereof is to provide an optical transmission system capable of supplying sufficient power from a master station device to a slave station device via an optical transmission path. .
　上記課題を解決するために、本発明のある態様の光伝送システムは、主信号光を出力する光送信器と、主信号光とは別の電力供給光を出力する電力供給用光源と、主信号光および電力供給光を増幅する光増幅器と、を備える親局装置と、親局装置からの主信号光および電力供給光を伝送する光伝送路と、電力供給光を光電変換することにより得られる電力を用いて、主信号光の受信処理を行う子局装置と、を備える。 In order to solve the above problems, an optical transmission system according to an aspect of the present invention includes an optical transmitter that outputs main signal light, a power supply light source that outputs power supply light different from the main signal light, An optical amplifier that amplifies signal light and power supply light, an optical transmission line that transmits main signal light and power supply light from the master station device, and photoelectric conversion of the power supply light. And a slave station device that performs reception processing of the main signal light using the generated power.
　この態様によると、親局装置から主信号光とは別の電力供給光を光伝送路を介して子局装置に伝送し、光電気変換を行うことで、子局装置に電力を供給することが可能となる。これにより、例えば子局装置を電源線の敷設されていない場所に設置する場合であっても、光伝送路ファイバのみを導入することで装置設置が可能となる。 According to this aspect, power is supplied to the slave station device by transmitting the power supply light different from the main signal light from the master station device to the slave station device via the optical transmission line and performing photoelectric conversion. Is possible. Thereby, for example, even when the slave station device is installed in a place where the power supply line is not installed, the device can be installed by introducing only the optical transmission line fiber.
　ここで、本態様においては、親局装置に光増幅器を設け電力供給光を増幅する構成としている。これにより、例えば光伝送路が長距離で損失が大きい場合であっても、大きな光パワーを伝送して子局装置へ安定した電力を供給することができる。 Here, in this aspect, an optical amplifier is provided in the master station apparatus to amplify the power supply light. Thereby, for example, even when the optical transmission path is long and the loss is large, it is possible to transmit a large optical power and supply stable power to the slave station apparatus.
　主信号光と電力供給光は、互いに波長が異なってもよい。また、親局装置は、主信号光と電力供給光とを合波する光合波器をさらに備え、光増幅器は、光合波器からの波長多重光を一括して増幅してもよい。また、光増幅器は、光送信器と電力供給用光源の後段にそれぞれ設けられており、親局装置は、増幅された主信号光と電力供給光とを合波する光合波器をさらに備えてもよい。 The main signal light and the power supply light may have different wavelengths. The master station device may further include an optical multiplexer that combines the main signal light and the power supply light, and the optical amplifier may collectively amplify the wavelength multiplexed light from the optical multiplexer. In addition, the optical amplifier is provided at the subsequent stage of the optical transmitter and the power supply light source, and the master station device further includes an optical multiplexer that combines the amplified main signal light and the power supply light. Also good.
　親局装置と子局装置との間に配置された中継局装置をさらに備え、電力供給光は、第１波長を有する第１電力供給光と、第１波長と異なる第２波長を有する第２電力供給光とを含み、光合波器は、主信号光、第１電力供給光、および第２電力供給光を合波した波長多重光を出力し、中継局装置は、波長多重光から第１電力供給光を分離する第１光スイッチと、主信号光と第２電力供給光の波長多重光を増幅する中継光増幅器と、第１電力供給光を光電変換し、中継光増幅器に電力を供給する中継局内電力供給装置と、を備え、子局装置は、中継局装置からの波長多重光から第２電力供給光を分離する第２光スイッチと、主信号光の受信処理を行う光受信器と、第２電力供給光を光電変換し、光受信器に電力を供給する子局内電力供給装置とを備えてもよい。 The relay station apparatus further includes a relay station apparatus disposed between the master station apparatus and the slave station apparatus, and the power supply light includes a first power supply light having a first wavelength and a second wavelength having a second wavelength different from the first wavelength. The optical multiplexer outputs wavelength multiplexed light obtained by combining the main signal light, the first power supply light, and the second power supply light, and the relay station device outputs the first signal from the wavelength multiplexed light. A first optical switch that separates the power supply light, a repeater optical amplifier that amplifies the wavelength multiplexed light of the main signal light and the second power supply light, photoelectrically converts the first power supply light, and supplies power to the repeater optical amplifier A relay station power supply device, and the slave station device is a second optical switch that separates the second power supply light from the wavelength multiplexed light from the relay station device, and an optical receiver that performs a reception process of the main signal light And an intra-slave power supply device that photoelectrically converts the second power supply light and supplies power to the optical receiver; It may be provided.
　光伝送路は、現用系光伝送路と予備系光伝送路とにより冗長構成されており、親局装置および子局装置は、現用系光伝送路と予備系光伝送路の間で運用する光伝送路の切替を行う光スイッチをさらに備え、光スイッチは、通常運用時は現用系光伝送路に主信号光が送信され、且つ予備系光伝送路に電力供給光が送信されるよう光伝送路を選択するとともに、現用系光伝送路で障害が発生した場合は予備系光伝送路により主信号光が送信されるよう光伝送路を切り替えてもよい。 The optical transmission line is redundantly composed of a working optical transmission line and a standby optical transmission line, and the master station device and the slave station device are optical devices operated between the working optical transmission line and the standby optical transmission line. The optical switch further includes an optical switch for switching the transmission line, and the optical switch transmits the main signal light to the active optical transmission line and the power supply light to the standby optical transmission line during normal operation. The optical transmission line may be switched so that the main signal light is transmitted through the standby optical transmission line when a failure occurs in the active optical transmission line.
　子局装置は、通常運用時に電力供給光を光電変換することにより得られる電力を充電する充電装置をさらに備え、現用系光伝送路で障害が発生した場合、充電装置に充電された電力を用いて主信号光の受信処理を行ってもよい。 The slave station device further includes a charging device that charges electric power obtained by photoelectrically converting the power supply light during normal operation, and uses a power charged in the charging device when a failure occurs in the active optical transmission line. The main signal light may be received.
　親局装置と子局装置は、ポイント・トゥ・ポイントネットワークにおける端局装置として配置されてもよい。また、親局装置と子局装置は、光リングネットワークにおける端局装置として配置されてもよい。 The master station device and the slave station device may be arranged as terminal devices in a point-to-point network. Further, the master station device and the slave station device may be arranged as terminal devices in the optical ring network.
　なお、以上の構成要素の任意の組合せ、本発明の表現を装置、方法、システム、プログラム、プログラムを格納した記録媒体などの間で変換したものもまた、本発明の態様として有効である。 It should be noted that any combination of the above-described constituent elements and the expression of the present invention converted between the apparatus, method, system, program, recording medium storing the program, etc. are also effective as an aspect of the present invention.
　本発明によれば、親局装置から子局装置へ光伝送路を介して十分な電力を供給できる光伝送システムを提供できる。 According to the present invention, it is possible to provide an optical transmission system capable of supplying sufficient power from a master station device to a slave station device via an optical transmission path.
本発明の実施形態に係る光伝送システムを説明するための図である。It is a figure for demonstrating the optical transmission system which concerns on embodiment of this invention. 本発明の別の実施形態に係る光伝送システムを説明するための図である。It is a figure for demonstrating the optical transmission system which concerns on another embodiment of this invention. 親局装置の変形例を説明するための図である。It is a figure for demonstrating the modification of a main | base station apparatus. 本発明のさらに別の実施形態に係る光伝送システムを説明するための図である。It is a figure for demonstrating the optical transmission system which concerns on another embodiment of this invention. 図４の光伝送システムにおいて、現用系光伝送路で障害が発生した場合における伝送経路を説明するための図である。FIG. 5 is a diagram for explaining a transmission path when a failure occurs in an active optical transmission path in the optical transmission system of FIG. 4. 本発明のさらに別の実施形態に係る光伝送システムを説明するための図である。It is a figure for demonstrating the optical transmission system which concerns on another embodiment of this invention. 図６の光伝送システムにおいて、現用系光伝送路で障害が発生した場合における伝送経路を説明するための図である。FIG. 7 is a diagram for explaining a transmission path when a failure occurs in an active optical transmission path in the optical transmission system of FIG. 6. 主信号光および電力供給光として用いる波長を説明するための図である。It is a figure for demonstrating the wavelength used as main signal light and electric power supply light.
　図１は、本発明の実施形態に係る光伝送システムを説明するための図である。図１に示す光伝送システム１００は、変調された主信号光を送信する親局装置１０と、主信号光を受信する子局装置２０と、親局装置１０と子局装置２０とを接続する光伝送路４０と、親局装置１０と子局装置２０との間に配置された中継局装置３０とを備える。光伝送システム１００は、複数の異なる波長の主信号光を多重して、親局装置１０と子局装置２０との間で光伝送路４０を介して伝送するポイント・トゥ・ポイントのＷＤＭ光伝送システムである。 FIG. 1 is a diagram for explaining an optical transmission system according to an embodiment of the present invention. An optical transmission system 100 illustrated in FIG. 1 connects a master station device 10 that transmits a modulated main signal light, a slave station device 20 that receives the main signal light, and the master station device 10 and the slave station device 20. An optical transmission line 40 and a relay station device 30 arranged between the master station device 10 and the slave station device 20 are provided. The optical transmission system 100 multiplexes a plurality of main signal lights having different wavelengths and transmits them between a master station device 10 and a slave station device 20 via an optical transmission line 40, and performs point-to-point WDM optical transmission. System.
　親局装置１０は、ｎ個（ｎは１以上の任意の整数）の光送信器ＯＳ１～ＯＳｎと、ｍ－ｎ個（ｍはｎより大きい任意の整数）の電力供給用光源ＬＤｎ＋１～ＬＤｍと、光送信器ＯＳ１～ＯＳｎおよび電力供給用光源ＬＤｎ＋１～ＬＤｍの後段に設けられた光合波器１２と、光合波器１２の後段に設けられた親局光増幅器１４とを備える。 The master station device 10 includes n (n is an arbitrary integer greater than or equal to 1) optical transmitters OS1 to OSn, and mn (m is an arbitrary integer greater than n) power supply light sources LDn + 1 to LDm. , Optical transmitters OS1 to OSn and power supply light sources LDn + 1 to LDm, an optical multiplexer 12 provided at the subsequent stage, and a master optical amplifier 14 provided at the subsequent stage of the optical multiplexer 12.
　光送信器ＯＳ１～ＯＳｎは、それぞれ、入力されたクライアント信号をフレーム化し、誤り訂正符号の付与など所定の送信処理を施した後、主信号光（波長λ１～λｎ）を出力する。主信号光の波長λ１～λｎは、それぞれ異なる波長である。 Each of the optical transmitters OS1 to OSn converts the input client signal into a frame, performs a predetermined transmission process such as adding an error correction code, and then outputs the main signal light (wavelengths λ1 to λn). The wavelengths λ1 to λn of the main signal light are different from each other.
　電力供給用光源ＬＤｎ＋１～ＬＤｍは、それぞれ、波長λ１～λｎの主信号光とは別の電力供給光（波長λｎ＋１～λｍ）を出力する。電力供給用光源ＬＤｎ＋１～ＬＤｍとしては、例えばレーザダイオードを用いることができる。電力供給光の波長λｎ＋１～λｍは、主信号の波長λ１～λｎとは異なる波長である。 The power supply light sources LDn + 1 to LDm output power supply light (wavelengths λn + 1 to λm) different from the main signal light of wavelengths λ1 to λn, respectively. As the power supply light sources LDn + 1 to LDm, for example, laser diodes can be used. The wavelengths λn + 1 to λm of the power supply light are different from the wavelengths λ1 to λn of the main signal.
　光合波器１２は、波長λ１～λｎの主信号光と、波長λｎ＋１～λｍの電力供給光とを合波して波長多重光を生成し、親局光増幅器１４に出力する。 The optical multiplexer 12 combines the main signal light having the wavelengths λ1 to λn and the power supply light having the wavelengths λn + 1 to λm to generate wavelength multiplexed light, which is output to the master optical amplifier 14.
　親局光増幅器１４は、光合波器１２からの波長多重光を一括して増幅し、光伝送路４０に出力する。親局光増幅器１４としては、エルビウム添加光ファイバ増幅器（ＥＤＦＡ）、半導体光増幅器（ＳＯＡ）等を用いることができる。 The master optical amplifier 14 collectively amplifies the wavelength multiplexed light from the optical multiplexer 12 and outputs it to the optical transmission line 40. As the master optical amplifier 14, an erbium-doped optical fiber amplifier (EDFA), a semiconductor optical amplifier (SOA), or the like can be used.
　なお、本実施形態において、親局装置１０には装置外部からの電源線が接続されており、親局装置１０内の各種デバイスは、該電源線から供給される電力により動作する。 In the present embodiment, a power line from the outside of the apparatus is connected to the master station apparatus 10, and various devices in the master station apparatus 10 operate with power supplied from the power line.
　光伝送路４０は、親局装置１０の親局光増幅器１４により増幅された主信号光および電力供給光の波長多重光を子局装置２０に伝送する。光伝送路４０としては、シングルモード光ファイバを用いることができる。 The optical transmission line 40 transmits the wavelength division multiplexed light of the main signal light and the power supply light amplified by the master optical amplifier 14 of the master station device 10 to the slave station device 20. As the optical transmission line 40, a single mode optical fiber can be used.
　光伝送路４０の中途には、中継局装置３０が設けられている。この中継局装置３０は、光伝送路４０内を伝搬中に減衰した波長多重光を増幅し、子局装置２０に向けて出力する中継光増幅器３２を備える。なお、本実施形態において、中継局装置３０には装置外部からの電源線が接続されており、中継局装置３０内の中継光増幅器３２は、該電源線から供給される電力により動作する。 In the middle of the optical transmission line 40, the relay station device 30 is provided. The repeater station device 30 includes a repeater optical amplifier 32 that amplifies the wavelength multiplexed light attenuated during propagation in the optical transmission line 40 and outputs the amplified light to the slave station device 20. In the present embodiment, the relay station device 30 is connected to a power line from the outside of the device, and the repeater optical amplifier 32 in the relay station device 30 operates with power supplied from the power line.
　子局装置２０は、光伝送路４０に接続された光分波器２２と、光分波器２２の後段に設けられたｎ個の光受信器ＯＲ１～ＯＲｎと、同じく光分波器２２の後段に設けられたｍ－ｎ個の光電変換器ＯＥｎ＋１～ＯＥｍと、子局内電力供給装置２４とを備える。なお、本実施形態において、子局装置２０には装置外部からの電源線が接続されていない。 The slave station device 20 includes an optical demultiplexer 22 connected to the optical transmission line 40, n optical receivers OR 1 to ORn provided at the subsequent stage of the optical demultiplexer 22, and the optical demultiplexer 22. There are provided mn photoelectric converters OEn + 1 to OEm provided in the subsequent stage and a power supply device 24 in the slave station. In the present embodiment, the slave station device 20 is not connected to a power line from the outside of the device.
　光分波器２２は、光伝送路４０を伝送された波長多重光を、波長λ１～λｎの主信号光および波長λｎ＋１～λｍの電力供給光に分波する。光合波器１２や光分波器２２としては、アレイ型導波路回折格子（ＡＷＧ）、ファイバグレーディング、誘電体多層膜などを用いることができる。波長λ１～λｎの主信号光は、それぞれ光受信器ＯＲ１～ＯＲｎにより受信され、光電変換、タイミング抽出、識別再生、誤り訂正などの所定の受信処理が行われた後、クライアント信号として出力される。 The optical demultiplexer 22 demultiplexes the wavelength multiplexed light transmitted through the optical transmission path 40 into main signal light with wavelengths λ1 to λn and power supply light with wavelengths λn + 1 to λm. As the optical multiplexer 12 and the optical demultiplexer 22, an array type waveguide diffraction grating (AWG), fiber grading, a dielectric multilayer film, or the like can be used. The main signal lights of wavelengths λ1 to λn are received by the optical receivers OR1 to ORn, respectively, are subjected to predetermined reception processing such as photoelectric conversion, timing extraction, identification reproduction and error correction, and then output as client signals. .
　一方、波長λｎ＋１～λｍの電力供給光は、それぞれ光電変換器ＯＥｎ＋１～ＯＥｍにより光電変換される。光電変換器ＯＥｎ＋１～ＯＥｍとしては、例えばフォトダイオードを用いることができる。各光電変換器ＯＥｎ＋１～ＯＥｍから出力された電力は、子局内電力供給装置２４に送られる。 On the other hand, power supply lights having wavelengths λn + 1 to λm are photoelectrically converted by photoelectric converters OEn + 1 to OEm, respectively. For example, photodiodes can be used as the photoelectric converters OEn + 1 to OEm. The electric power output from each of the photoelectric converters OEn + 1 to OEm is sent to the power supply device 24 in the slave station.
　子局内電力供給装置２４は、光電変換器ＯＥｎ＋１～ＯＥｍから送られた電力を、子局装置２０内の各種デバイスに供給する。例えば、光受信器ＯＲ１～ＯＲｎは、子局内電力供給装置２４からの電力を用いて、上述の受信処理を行う。 The slave station power supply device 24 supplies the power sent from the photoelectric converters OEn + 1 to OEm to various devices in the slave station device 20. For example, the optical receivers OR1 to ORn perform the above-described reception process using the power from the intra-stationary power supply device 24.
　以上説明したように、本実施形態に係る光伝送システム１００によれば、親局装置１０から主信号光とは別の電力供給光を光伝送路４０を介して子局装置２０に伝送し、光電気変換を行うことで子局装置２０に電力を供給することが可能となる。これにより、例えば子局装置２０を電源線の敷設されていない場所に設置する場合であっても、光伝送路ファイバのみを導入することで装置設置が可能となる。 As described above, according to the optical transmission system 100 according to the present embodiment, the power supply light different from the main signal light is transmitted from the master station device 10 to the slave station device 20 via the optical transmission path 40, It becomes possible to supply electric power to the slave station device 20 by performing the photoelectric conversion. Thereby, for example, even when the slave station device 20 is installed in a place where the power line is not installed, the device can be installed by introducing only the optical transmission line fiber.
　ここで、本実施形態においては、親局装置１０に親局光増幅器１４を設け、さらに中継局装置３０に中継光増幅器３２を設けている。これにより、光伝送路４０が長距離で損失が大きい場合においても、大きな光パワーを伝送して子局装置２０へ安定した電力を供給することが可能となる。 Here, in this embodiment, the master station optical amplifier 14 is provided in the master station apparatus 10, and the repeater optical amplifier 32 is provided in the repeater station apparatus 30. Accordingly, even when the optical transmission line 40 is long and has a large loss, it is possible to transmit a large optical power and supply stable power to the slave station device 20.
　図２は、本発明の別の実施形態に係る光伝送システムを説明するための図である。図２に示す光伝送システム１００は、変調された主信号光を送信する親局装置１０と、主信号光を受信する子局装置２０と、親局装置１０と子局装置２０とを接続する光伝送路４０と、親局装置１０と子局装置２０との間に配置された中継局装置３０とを備える。この光伝送システム１００もまた、ポイント・トゥ・ポイントのＷＤＭ光伝送システムである。 FIG. 2 is a diagram for explaining an optical transmission system according to another embodiment of the present invention. The optical transmission system 100 shown in FIG. 2 connects the master station device 10 that transmits the modulated main signal light, the slave station device 20 that receives the main signal light, and the master station device 10 and the slave station device 20. An optical transmission line 40 and a relay station device 30 arranged between the master station device 10 and the slave station device 20 are provided. This optical transmission system 100 is also a point-to-point WDM optical transmission system.
　親局装置１０は、ｎ個（ｎは１以上の任意の整数）の光送信器ＯＳ１～ＯＳｎと、２個の電力供給用光源ＬＤｎ＋１およびＬＤｎ＋２と、光送信器ＯＳ１～ＯＳｎの後段に設けられた光合波器１２と、電力供給用光源ＬＤｎ＋１およびＬＤｎ＋２の後段に設けられた光合波器１３と、光合波器１２の後段に設けられた親局光増幅器１４と、光合波器１３の後段に設けられた親局光増幅器１５とを備える。 The master station apparatus 10 is provided in the subsequent stage of n optical transmitters OS1 to OSn (n is an arbitrary integer equal to or greater than 1), two power supply light sources LDn + 1 and LDn + 2, and optical transmitters OS1 to OSn. The optical multiplexer 12, the optical multiplexer 13 provided at the subsequent stage of the power supply light sources LDn + 1 and LDn + 2, the master optical amplifier 14 provided at the subsequent stage of the optical multiplexer 12, and the optical multiplexer 13 at the subsequent stage. And a master optical amplifier 15 provided.
　光送信器ＯＳ１～ＯＳｎは、それぞれ波長λ１～λｎの主信号光を出力する。また、電力供給用光源ＬＤｎ＋１は、所定の第１波長λｎ＋１を有する第１電力供給光を出力し、電力供給用光源ＬＤｎ＋２は、所定の第２波長λｎ＋２を有する第２電力供給光を出力する。第１波長λｎ＋１と第２波長λｎ＋２は、異なる波長である。 The optical transmitters OS1 to OSn output main signal lights having wavelengths λ1 to λn, respectively. The power supply light source LDn + 1 outputs first power supply light having a predetermined first wavelength λn + 1, and the power supply light source LDn + 2 outputs second power supply light having a predetermined second wavelength λn + 2. The first wavelength λn + 1 and the second wavelength λn + 2 are different wavelengths.
　光送信器ＯＳ１～ＯＳｎからの主信号光は、光合波器１２により合波された後、親局光増幅器１４により増幅される。一方、第１電力供給光および第２電力供給光は、光合波器１３により合波された後、親局光増幅器１５により増幅される。親局光増幅器１４および１５から出力された主信号光、第１電力供給光および第２電力供給光は、カプラ１７で合波された後、光伝送路４０に送られる。 The main signal light from the optical transmitters OS 1 to OSn is multiplexed by the optical multiplexer 12 and then amplified by the master optical amplifier 14. On the other hand, the first power supply light and the second power supply light are combined by the optical multiplexer 13 and then amplified by the master optical amplifier 15. The main signal light, the first power supply light, and the second power supply light output from the master optical amplifiers 14 and 15 are combined by the coupler 17 and then sent to the optical transmission line 40.
　中継局装置３０は、光伝送路４０からの波長多重光を受ける光スイッチ３４と、光スイッチの後段に設けられた中継光増幅器３２と、光スイッチ３４により分離された光を受ける光電変換器ＯＥｎ＋１と、中継局内電力供給装置３６とを備える。光スイッチとしては、波長選択スイッチ（WSS:Wave Selectable Switch）を用いることができる。なお、本実施形態において、中継局装置３０には装置外部からの電源線が接続されていない。 The relay station device 30 includes an optical switch 34 that receives wavelength-multiplexed light from the optical transmission line 40, a relay optical amplifier 32 that is provided at the subsequent stage of the optical switch, and a photoelectric converter OEn + 1 that receives light separated by the optical switch 34. And a relay station power supply device 36. A wavelength selective switch (WSS: Wave Selectable Switch) can be used as the optical switch. In the present embodiment, the relay station device 30 is not connected to a power line from the outside of the device.
　光スイッチ３４は、受信した波長多重光から、波長λｎ＋１の第１電力供給光を分離する。この分離された第１電力供給光は、光電変換器ＯＥｎ＋１に送られる。一方、波長１～λｎの主信号光および波長λｎ＋２の第２電力供給光は、中継光増幅器３２に送られる。 The optical switch 34 separates the first power supply light having the wavelength λn + 1 from the received wavelength multiplexed light. The separated first power supply light is sent to the photoelectric converter OEn + 1. On the other hand, the main signal light of wavelengths 1 to λn and the second power supply light of wavelength λn + 2 are sent to the repeater optical amplifier 32.
　波長λｎ＋１の第１電力供給光は、光電変換器ＯＥｎ＋１で光電変換される。光電変換器ＯＥｎ＋１から出力された電力は、中継局内電力供給装置３６に送られる。中継局内電力供給装置３６は、光電変換器ＯＥｎ＋１からの電力を中継局装置３０内の各種デバイスに供給する。例えば、中継光増幅器３２は、中継局内電力供給装置３６からの電力を用いて、波長λ１～λｎおよびλｎ＋２の波長多重光を増幅する。この増幅された波長多重光は、子局装置２０に送られる。 The first power supply light having the wavelength λn + 1 is photoelectrically converted by the photoelectric converter OEn + 1. The power output from the photoelectric converter OEn + 1 is sent to the relay station power supply device 36. The relay station power supply device 36 supplies the power from the photoelectric converter OEn + 1 to various devices in the relay station device 30. For example, the repeater optical amplifier 32 amplifies the wavelength multiplexed light of wavelengths λ1 to λn and λn + 2 using the power from the relay station power supply device 36. The amplified wavelength multiplexed light is sent to the slave station device 20.
　子局装置２０は、光伝送路４０に接続された光スイッチ２６と、光スイッチ２６の後段に設けられた子局光増幅器２８と、子局光増幅器２８の後段に設けられた光分波器２２と、光分波器２２に後段に設けられたｎ個の光受信器ＯＲ１～ＯＲｎと、光スイッチ２６により分離された光を受ける光電変換器ＯＥｎ＋２と、子局内電力供給装置２４とを備える。なお、本実施形態において、子局装置２０には装置外部からの電源線が接続されていない。 The slave station device 20 includes an optical switch 26 connected to the optical transmission line 40, a slave station optical amplifier 28 provided at the subsequent stage of the optical switch 26, and an optical demultiplexer provided at the subsequent stage of the slave station optical amplifier 28. 22, n optical receivers OR 1 to ORn provided in the subsequent stage of the optical demultiplexer 22, a photoelectric converter OEn + 2 that receives the light separated by the optical switch 26, and a sub-station power supply device 24. . In the present embodiment, the slave station device 20 is not connected to a power line from the outside of the device.
　光スイッチ２６は、受信した波長多重光から、第２波長λｎ＋２の第２電力供給光を分離する。この分離された第２電力供給光は、光電変換器ＯＥｎ＋２に送られる。一方、波長１～λｎの主信号光は、子局光増幅器２８に送られる。 The optical switch 26 separates the second power supply light having the second wavelength λn + 2 from the received wavelength multiplexed light. The separated second power supply light is sent to the photoelectric converter OEn + 2. On the other hand, the main signal light of wavelengths 1 to λn is sent to the slave optical amplifier 28.
　波長１～λｎの主信号光は、光分波器２２により分波された後、光受信器ＯＲ１～ＯＲｎにより受信され、光電変換、タイミング抽出、識別再生、誤り訂正などの所定の受信処理が行われた後、クライアント信号として出力される。 The main signal light of wavelengths 1 to λn is demultiplexed by the optical demultiplexer 22 and then received by the optical receivers OR1 to ORn, and predetermined reception processing such as photoelectric conversion, timing extraction, identification reproduction, error correction, and the like is performed. After being performed, it is output as a client signal.
　一方、第２電力供給光は、光電変換器ＯＥｎ＋２で光電変換される。光電変換器ＯＥｎ＋２から出力された電力は、子局内電力供給装置２４に送られる。子局内電力供給装置２４は、光電変換器ＯＥｎ＋２からの電力を子局装置２０内の各種デバイスに供給する。例えば、子局内電力供給装置２４は、子局光増幅器２８、光受信器ＯＲ１～ＯＲｎなどに動作のための電力を供給する。 On the other hand, the second power supply light is photoelectrically converted by the photoelectric converter OEn + 2. The power output from the photoelectric converter OEn + 2 is sent to the slave station power supply device 24. The slave station power supply device 24 supplies the power from the photoelectric converter OEn + 2 to various devices in the slave station device 20. For example, the slave station power supply device 24 supplies power for operation to the slave station optical amplifier 28, the optical receivers OR1 to ORn, and the like.
　以上説明したように、図２に示す光伝送システム１００によれば、親局装置１０から第１波長λｎ＋１の第１電力供給光を中継局装置３０に伝送し、光電気変換を行うことで中継局装置３０に電力を供給することができる。また、親局装置１０から第２波長λｎ＋２の第２電力供給光を子局装置２０に伝送し、光電気変換を行うことで子局装置２０に電力を供給することができる。これにより、例えば子局装置２０や中継局装置３０を電源線の敷設されていない場所に設置する場合であっても、光伝送路ファイバのみを導入することで装置設置が可能となる。 As described above, according to the optical transmission system 100 shown in FIG. 2, the first power supply light having the first wavelength λn + 1 is transmitted from the master station device 10 to the relay station device 30 and is relayed by performing photoelectric conversion. Power can be supplied to the station device 30. In addition, the second station power supply light having the second wavelength λn + 2 is transmitted from the master station apparatus 10 to the slave station apparatus 20, and power can be supplied to the slave station apparatus 20 by performing photoelectric conversion. Thereby, for example, even when the slave station device 20 or the relay station device 30 is installed in a place where the power line is not laid, the device can be installed by introducing only the optical transmission line fiber.
　ここで、本実施形態においては、親局装置１０に親局光増幅器１５を設けている。これにより、光伝送路４０が長距離で損失が大きい場合においても、大きな光パワーを伝送して子局装置２０や中継局装置３０へ安定した電力を供給することが可能となる。 Here, in this embodiment, the master station optical amplifier 15 is provided in the master station apparatus 10. As a result, even when the optical transmission line 40 is long and has a large loss, it is possible to transmit a large optical power and supply stable power to the slave station device 20 and the relay station device 30.
　図３は、親局装置の変形例を説明するための図である。図３に示す親局装置１０においては、光送信器ＯＳ１～ＯＳｎの後段に光増幅器ＡＰ１～ＡＰｎがそれぞれ設けられている。また、電力供給用光源ＬＤｎ＋１～ＬＤｍの後段に光増幅器ＡＰｎ＋１～ＡＰｍが設けられている。そして、光増幅器ＡＰ１～ＡＰｎと光増幅器ＡＰｎ＋１～ＡＰｍの後段に光合波器１２が設けられ、該光合波器１２により主信号光と電力供給光とが合波される構成となっている。 FIG. 3 is a diagram for explaining a modification of the master station device. In the master station device 10 shown in FIG. 3, optical amplifiers AP1 to APn are respectively provided after the optical transmitters OS1 to OSn. Further, optical amplifiers APn + 1 to APm are provided at the subsequent stage of the power supply light sources LDn + 1 to LDm. An optical multiplexer 12 is provided at the subsequent stage of the optical amplifiers AP1 to APn and the optical amplifiers APn + 1 to APm, and the main signal light and the power supply light are combined by the optical multiplexer 12.
　このように、合波した波長多重光を一括して増幅するのではなく、波長ごとに増幅器を設けることで、光源の出力パワー、光伝送路４０の特性、および中継局装置や子局装置で必要とされる電力などに応じて、波長ごとに適切な増幅率を設定することができる。 In this way, instead of amplifying the multiplexed wavelength multiplexed light in a lump, by providing an amplifier for each wavelength, the output power of the light source, the characteristics of the optical transmission line 40, and the repeater station apparatus or slave station apparatus An appropriate amplification factor can be set for each wavelength according to the required power.
　図４は、本発明のさらに別の実施形態に係る光伝送システムを説明するための図である。図４に示す光伝送システム１００は、変調された主信号光を送信する親局装置１０と、主信号光を受信する子局装置２０と、親局装置１０と子局装置２０とを接続する光伝送路４０とを備える。この光伝送システム１００もまた、ポイント・トゥ・ポイントのＷＤＭ光伝送システムである。 FIG. 4 is a diagram for explaining an optical transmission system according to still another embodiment of the present invention. The optical transmission system 100 shown in FIG. 4 connects the master station device 10 that transmits the modulated main signal light, the slave station device 20 that receives the main signal light, and the master station device 10 and the slave station device 20. And an optical transmission line 40. This optical transmission system 100 is also a point-to-point WDM optical transmission system.
　親局装置１０は、ｎ個の光送信器ＯＳ１～ＯＳｎと、ｎ個の電力供給用光源ＬＤ１～ＬＤｎと、光送信器ＯＳ１～ＯＳｎの後段に設けられた光合波器１２と、電力供給用光源ＬＤ１～ＬＤｎの後段に設けられた光合波器１３と、光合波器１２、１３の後段に設けられた光スイッチ１６と、光スイッチ１６の後段に並列に設けられた親局光増幅器１４、１５とを備える。本実施形態において、光送信器ＯＳ１～ＯＳｎおよび電力供給用光源ＬＤ１～ＬＤｎが出力する光の波長帯λ１～λｎは、同一に設定しているが、異なっていてもよい。 The master station device 10 includes n optical transmitters OS1 to OSn, n power supply light sources LD1 to LDn, an optical multiplexer 12 provided at the subsequent stage of the optical transmitters OS1 to OSn, and a power supply unit. An optical multiplexer 13 provided downstream of the light sources LD1 to LDn, an optical switch 16 provided downstream of the optical multiplexers 12, 13, and a master optical amplifier 14 provided in parallel downstream of the optical switch 16, 15. In the present embodiment, the wavelength bands λ1 to λn of light output from the optical transmitters OS1 to OSn and the power supply light sources LD1 to LDn are set to be the same, but may be different.
　本実施形態において、光伝送路４０は、現用系光伝送路４１と予備系光伝送路４２とにより冗長構成されている。現用系光伝送路４１および予備系光伝送路４２は、それぞれ一端が親局装置１０の光スイッチ１６に接続され、他端が子局装置２０の光スイッチ２６に接続されている。そして、親局光増幅器１４は現用系光伝送路４１上に、親局光増幅器１５は予備系光伝送路４２上に設けられている。 In this embodiment, the optical transmission line 40 is redundantly configured by an active optical transmission line 41 and a standby optical transmission line 42. Each of the working optical transmission line 41 and the standby optical transmission line 42 has one end connected to the optical switch 16 of the master station device 10 and the other end connected to the optical switch 26 of the slave station device 20. The master optical amplifier 14 is provided on the working optical transmission line 41, and the master optical amplifier 15 is provided on the standby optical transmission line 42.
　子局装置２０は、現用系光伝送路４１および予備系光伝送路４２に接続された光スイッチ２６と、光スイッチ２６の後段に設けられた光分波器２２および２３と、光分波器２２の後段に設けられたｎ個の光受信器ＯＲ１～ＯＲｎと、光分波器２３の後段に設けられたｎ個の光電変換器ＯＥ１～ＯＥｎと、子局内電力供給装置２４と、充電装置２５とを備える。 The slave station device 20 includes an optical switch 26 connected to the working optical transmission line 41 and the standby optical transmission line 42, optical demultiplexers 22 and 23 provided at the subsequent stage of the optical switch 26, and an optical demultiplexer. 22, n optical receivers OR1 to ORn provided in the subsequent stage, n photoelectric converters OE1 to OEn provided in the subsequent stage of the optical demultiplexer 23, the sub-station power supply device 24, and the charging device 25.
　本実施形態において、親局装置１０の光スイッチ１６および子局装置２０の光スイッチ２６は、現用系光伝送路４１と予備系光伝送路４２の間で運用する光伝送路の切替を行う。なお、本実施形態において、子局装置２０には装置外部からの電源線が接続されていない。 In this embodiment, the optical switch 16 of the master station device 10 and the optical switch 26 of the slave station device 20 perform switching of the optical transmission line to be operated between the active optical transmission line 41 and the standby optical transmission line 42. In the present embodiment, the slave station device 20 is not connected to a power line from the outside of the device.
　次に、図４に示す光伝送システム１００の動作について説明する。図４には、通常運用時における主信号光および電力供給光の伝送経路が太線で図示されている。 Next, the operation of the optical transmission system 100 shown in FIG. 4 will be described. In FIG. 4, the transmission paths of the main signal light and the power supply light during normal operation are indicated by bold lines.
　光送信器ＯＳ１～ＯＳｎから出力された波長λ１～λｎの主信号光は、光合波器１２で合波された後、光スイッチ１６に入力される。また、電力供給用光源ＬＤ１～ＬＤｎから出力された波長λ１～λｎは、光合波器１３で合波された後、光スイッチ１６に出力される。 The main signal lights of wavelengths λ 1 to λn output from the optical transmitters OS 1 to OSn are combined by the optical multiplexer 12 and then input to the optical switch 16. The wavelengths λ1 to λn output from the power supply light sources LD1 to LDn are combined by the optical multiplexer 13 and then output to the optical switch 16.
　通常運用時において、光スイッチ１６は、波長λ１～λｎの主信号光の波長多重光を現用系光伝送路４１に出力し、波長λ１～λｎの電力供給光の波長多重光を予備系光伝送路４２に出力するよう設定される。波長λ１～λｎの主信号光の波長多重光は、親局光増幅器１４により増幅され、波長λ１～λｎの電力供給光の波長多重光は、親局光増幅器１５により増幅される。 During normal operation, the optical switch 16 outputs the wavelength multiplexed light of the main signal light having the wavelengths λ1 to λn to the working optical transmission line 41 and the wavelength multiplexed light of the power supply light having the wavelengths λ1 to λn to the standby optical transmission. The output is set to the path 42. The wavelength multiplexed light of the main signal light having the wavelengths λ1 to λn is amplified by the master optical amplifier 14, and the wavelength multiplexed light of the power supply light having the wavelengths λ1 to λn is amplified by the master optical amplifier 15.
　現用系光伝送路４１を伝送された主信号光の波長多重光および予備系光伝送路４２を伝送されたの電力供給光の波長多重光は、光スイッチ２６に入力される。通常運用時において、光スイッチ２６は、主信号光の波長多重光を光分波器２２に出力し、電力供給光の波長多重光を光分波器２３に出力するよう設定される。 The wavelength multiplexed light of the main signal light transmitted through the active optical transmission line 41 and the wavelength multiplexed light of the power supply light transmitted through the standby optical transmission line 42 are input to the optical switch 26. During normal operation, the optical switch 26 is set to output the wavelength multiplexed light of the main signal light to the optical demultiplexer 22 and to output the wavelength multiplexed light of the power supply light to the optical demultiplexer 23.
　光分波器２２により分波された波長λ１～λｎの主信号光は、光受信器ＯＲ１～ＯＲｎにより受信され、光電変換、タイミング抽出、識別再生、誤り訂正などの所定の受信処理が行われた後、クライアント信号として出力される。 The main signal lights having wavelengths λ1 to λn demultiplexed by the optical demultiplexer 22 are received by the optical receivers OR1 to ORn, and predetermined reception processing such as photoelectric conversion, timing extraction, identification reproduction, and error correction is performed. After that, it is output as a client signal.
　一方、光分波器２３により分波された波長λ１～λｎの電力供給光は、光電変換器ＯＥ１～ＯＥｎで光電変換される。光電変換された電力は、子局内電力供給装置２４に送られる。子局内電力供給装置２４は、光電変換器ＯＥ１～ＯＥｎからの電力を子局装置２０内の各種デバイスに供給する。例えば、子局内電力供給装置２４は、光受信器ＯＲ１～ＯＲｎなどに動作のための電力を供給する。 On the other hand, the power supply light having the wavelengths λ1 to λn demultiplexed by the optical demultiplexer 23 is photoelectrically converted by the photoelectric converters OE1 to OEn. The photoelectrically converted power is sent to the power supply device 24 in the slave station. The slave station power supply device 24 supplies the power from the photoelectric converters OE1 to OEn to various devices in the slave station device 20. For example, the slave station power supply device 24 supplies power for operation to the optical receivers OR1 to ORn.
　また、子局内電力供給装置２４は、光電変換器ＯＥ１～ＯＥｎからの電力の一部を、充電装置２５に出力する。充電装置２５は、通常運用時の間、子局内電力供給装置２４から供給された電力を充電する。 Also, the slave station power supply device 24 outputs a part of the power from the photoelectric converters OE1 to OEn to the charging device 25. The charging device 25 charges the power supplied from the slave station power supply device 24 during normal operation.
　図５は、現用系光伝送路において障害が発生した場合における伝送経路を説明するための図である。現用系光伝送路４１において断線などの障害５０が発生した場合、光スイッチ１６は、波長λ１～λｎの主信号光の波長多重光が予備系光伝送路４２に出力されるよう伝送経路を切り替える。また、光スイッチ２６は、予備系光伝送路４２を伝送された主信号光の波長多重光が光分波器２２に入力されるよう経路を切り替える。 FIG. 5 is a diagram for explaining a transmission path when a failure occurs in the working optical transmission path. When a fault 50 such as a disconnection occurs in the active optical transmission line 41, the optical switch 16 switches the transmission path so that the wavelength multiplexed light of the main signal light having the wavelengths λ1 to λn is output to the standby optical transmission line 42. . The optical switch 26 switches the path so that the wavelength division multiplexed light of the main signal light transmitted through the backup optical transmission path 42 is input to the optical demultiplexer 22.
　また、障害発生時において、充電装置２５は、通常運用時に充電された電力を子局内電力供給装置２４に供給する。子局内電力供給装置２４は、充電装置２５から供給された電力を光受信器ＯＲ１～ＯＲｎなどに供給する。この電力を用いることにより、障害発生時であっても主信号光の受信処理を行うことができる。 Further, when a failure occurs, the charging device 25 supplies the power charged during normal operation to the power supply device 24 in the slave station. The slave station power supply device 24 supplies the power supplied from the charging device 25 to the optical receivers OR1 to ORn. By using this power, the main signal light can be received even when a failure occurs.
　以上説明したように、本実施形態に係る光伝送システム１００によれば、通常運用時において、親局装置１０から主信号光とは別の電力供給光を光伝送路４０を介して子局装置２０に伝送し、光電気変換を行うことで子局装置２０に電力を供給することができる。ここで、親局装置１０に電力供給光を増幅する親局光増幅器１５を設けているので、予備系光伝送路４２が長距離で損失が大きい場合においても、大きな光パワーを伝送して子局装置２０へ安定した電力を供給することができる。 As described above, according to the optical transmission system 100 according to the present embodiment, the power supply light different from the main signal light is transmitted from the master station device 10 via the optical transmission line 40 during the normal operation. It is possible to supply electric power to the slave station device 20 by transmitting to 20 and performing photoelectric conversion. Here, since the master station optical amplifier 15 for amplifying the power supply light is provided in the master station apparatus 10, even when the standby optical transmission line 42 is long and has a large loss, a large optical power is transmitted to the slave station. Stable power can be supplied to the station apparatus 20.
　また、本実施形態に係る光伝送システム１００によれば、現用系光伝送路４１に障害が発生した場合であっても、主信号光の伝送経路を切り替えるとともに充電装置２５に充電された電力を用いることで、主信号光の伝送を確実に行うことができる。このように、本実施形態によれば、装置の信頼性を高めることができるとともに、通常運用時において予備系光伝送路４２を有効に活用することができる。 Further, according to the optical transmission system 100 according to the present embodiment, even when a failure occurs in the working optical transmission line 41, the transmission path of the main signal light is switched and the electric power charged in the charging device 25 is supplied. By using it, the main signal light can be reliably transmitted. Thus, according to the present embodiment, the reliability of the apparatus can be improved, and the standby optical transmission line 42 can be effectively utilized during normal operation.
　図６は、本発明のさらに別の実施形態に係る光伝送システムを説明するための図である。図６に示す光伝送システム１００は、光リングネットワークを構成している。この光リングネットワークは、複数の端局装置を光伝送路で相互に接続し、リング状の光通信ネットワークを構成したものである。図６には、端局装置として、親局装置１０ａおよび１０ｂと、子局装置２０とが配置された光リングネットワークが示されている。なお、親局装置１０ａおよび１０ｂと、子局装置２０の構成は、図５に示したものとほぼ同一であるため、詳細な説明は省略するとともに、一部の構成要素の図示を省略する。 FIG. 6 is a diagram for explaining an optical transmission system according to still another embodiment of the present invention. The optical transmission system 100 shown in FIG. 6 constitutes an optical ring network. In this optical ring network, a plurality of terminal devices are connected to each other via an optical transmission line to form a ring-shaped optical communication network. FIG. 6 shows an optical ring network in which master station devices 10a and 10b and a slave station device 20 are arranged as terminal devices. Note that the configurations of the master station devices 10a and 10b and the slave station device 20 are substantially the same as those shown in FIG. 5, and thus detailed description is omitted and some components are not shown.
　図６には、通常運用時における主信号光および電力供給光の伝送経路が矢印で図示されている。通常運用時において、光スイッチ１６は、波長λ１～λｎの主信号光の波長多重光を現用系光伝送路４１に出力し、第１波長λ１を有する第１電力供給光を予備系光伝送路４２に出力するよう設定される。主信号光の波長多重光は、親局光増幅器１４により増幅された後、現用系光伝送路４１を反時計回りで伝送され、子局装置２０に到達する。一方、第１電力供給光は、親局光増幅器１５により増幅された後、予備系光伝送路４２を時計回りで伝送され、子局装置２０に到達する。 In FIG. 6, the transmission paths of the main signal light and the power supply light during normal operation are indicated by arrows. During normal operation, the optical switch 16 outputs the wavelength-multiplexed light of the main signal light having the wavelengths λ1 to λn to the working optical transmission line 41 and the first power supply light having the first wavelength λ1 as the standby optical transmission line. 42 is set to output. The wavelength multiplexed light of the main signal light is amplified by the master optical amplifier 14 and then transmitted counterclockwise through the working optical transmission line 41 to reach the slave station device 20. On the other hand, the first power supply light is amplified by the master optical amplifier 15 and then transmitted clockwise through the backup optical transmission line 42 to reach the slave station device 20.
　現用系光伝送路４１を伝送された主信号光の波長多重光および予備系光伝送路４２を伝送されたの第１電力供給光は、光スイッチ２６に入力される。通常運用時において、光スイッチ２６は、主信号光の波長多重光が光受信器（図示せず）に入力され、第１電力供給光が光電変換器ＯＥに入力されるように設定される。図４の光伝送システムと同様に、子局内電力供給装置２４は、光電変換器ＯＥからの電力を子局装置２０内の各種デバイスに供給するとともに、電力の一部を充電装置２５に蓄える。 The wavelength multiplexed light of the main signal light transmitted through the working optical transmission line 41 and the first power supply light transmitted through the standby optical transmission line 42 are input to the optical switch 26. During normal operation, the optical switch 26 is set so that the wavelength-multiplexed light of the main signal light is input to an optical receiver (not shown) and the first power supply light is input to the photoelectric converter OE. Similar to the optical transmission system in FIG. 4, the slave station power supply device 24 supplies the power from the photoelectric converter OE to various devices in the slave station device 20 and stores a part of the power in the charging device 25.
　また、本実施の形態においては、図６に示すように、予備系光伝送路４２の中途に配置された親局装置１０ｂから、第２波長λ２を有する第２電力供給光が出力されている。この第２電力供給光は、第１電力供給光と合波された後、予備系光伝送路４２を介して子局装置２０に伝送される。この第２電力供給光を光電変換することにより得られた電力もまた、子局装置２０内の各種デバイスに供給されるとともに、電力の一部が充電装置２５に蓄えられる。 In the present embodiment, as shown in FIG. 6, the second power supply light having the second wavelength λ2 is output from the master station device 10b arranged in the middle of the standby optical transmission line 42. . The second power supply light is combined with the first power supply light, and then transmitted to the slave station device 20 via the standby optical transmission line 42. The electric power obtained by photoelectrically converting the second electric power supply light is also supplied to various devices in the slave station device 20, and a part of the electric power is stored in the charging device 25.
　図７は、現用系光伝送路において障害が発生した場合における伝送経路を説明するための図である。現用系光伝送路４１において断線などの障害５０が発生した場合、光スイッチ１６は、波長λ１～λｎの主信号光の波長多重光が予備系光伝送路４２に出力されるよう伝送経路を切り替える。また、光スイッチ２６は、予備系光伝送路４２を伝送された主信号光の波長多重光が光受信器に入力されるよう経路を切り替える。さらに、親局装置１０ｂは、第２電力供給光の合波を中止する。 FIG. 7 is a diagram for explaining a transmission path when a failure occurs in the active optical transmission path. When a fault 50 such as a disconnection occurs in the active optical transmission line 41, the optical switch 16 switches the transmission path so that the wavelength multiplexed light of the main signal light having the wavelengths λ1 to λn is output to the standby optical transmission line 42. . The optical switch 26 switches the path so that the wavelength-multiplexed light of the main signal light transmitted through the backup optical transmission path 42 is input to the optical receiver. Furthermore, the master station device 10b stops the multiplexing of the second power supply light.
　また、障害発生時において、充電装置２５は、通常運用時に充電された電力を子局内電力供給装置２４に供給する。子局内電力供給装置２４は、充電装置２５から供給された電力を光受信器などに供給する。この電力を用いることにより、障害発生時であっても主信号光の受信処理を行うことができる。 Further, when a failure occurs, the charging device 25 supplies the power charged during normal operation to the power supply device 24 in the slave station. The slave station power supply device 24 supplies the power supplied from the charging device 25 to an optical receiver or the like. By using this power, the main signal light can be received even when a failure occurs.
　以上説明したように、本実施形態に係る光伝送システム１００によれば、通常運用時において、親局装置１０ａからの第１電力供給光を光伝送路４０を介して子局装置２０に伝送し、光電気変換を行うことで子局装置２０に電力を供給することができる。ここで、親局装置１０ａに第１電力供給光を増幅する親局光増幅器１５を設けているので、予備系光伝送路４２が長距離で損失が大きい場合においても、大きな光パワーを伝送して子局装置２０へ安定した電力を供給することができる。 As described above, according to the optical transmission system 100 according to the present embodiment, the first power supply light from the master station device 10a is transmitted to the slave station device 20 via the optical transmission line 40 during normal operation. The power can be supplied to the slave station device 20 by performing photoelectric conversion. Here, since the master station optical amplifier 15 that amplifies the first power supply light is provided in the master station apparatus 10a, even when the standby optical transmission line 42 is long and has a large loss, it transmits a large optical power. Stable power can be supplied to the slave station device 20.
　また、本実施形態によれば、現用系光伝送路４１に障害が発生した場合であっても、主信号光の伝送経路を切り替えるとともに充電装置２５に充電された電力を用いることで、主信号光の伝送を確実に行うことができる。このように、本実施形態によれば、装置の信頼性を高めることができるとともに、通常運用時においては予備系光伝送路４２を有効に活用することができる。 Further, according to the present embodiment, even when a failure occurs in the working optical transmission line 41, the main signal light is switched by switching the transmission path of the main signal light and using the power charged in the charging device 25. It is possible to reliably transmit light. Thus, according to the present embodiment, the reliability of the apparatus can be improved, and the standby optical transmission line 42 can be effectively used during normal operation.
　また、本実施形態によれば、光リングネットワークを構成したことにより、予備系光伝送路４２の中途に位置する親局装置１０ｂからの第２電力供給光を合波して子局装置２０に伝送することができる。これにより、子局装置２０に供給する電力を増大できる。 In addition, according to the present embodiment, since the optical ring network is configured, the second power supply light from the master station device 10b located in the middle of the standby optical transmission line 42 is multiplexed to the slave station device 20. Can be transmitted. Thereby, the electric power supplied to the slave station apparatus 20 can be increased.
　さらに、本実施形態によれば、光リングネットワークを構成したことにより、例えば親局装置１０ａと１０ｂの間の予備系光伝送路４２において断線などの障害が発生した場合であっても、第２電力供給光は子局装置２０に伝送することができる。これにより、子局装置２０に電力が供給されなくなる事態を回避できるので、装置の信頼性をより高めることができる。 Furthermore, according to the present embodiment, since the optical ring network is configured, even if a failure such as a disconnection occurs in the backup optical transmission line 42 between the master station devices 10a and 10b, the second The power supply light can be transmitted to the slave station device 20. Thereby, since the situation where power is not supplied to the slave station device 20 can be avoided, the reliability of the device can be further improved.
　図８は、主信号光および電力供給光として用いる波長を説明するための図である。図８は、伝送路ファイバの損失特性を示す図である。 FIG. 8 is a diagram for explaining wavelengths used as main signal light and power supply light. FIG. 8 is a diagram illustrating loss characteristics of the transmission line fiber.
　例えば、上述の図１に示す実施形態において、主信号光の波長λ１～λｎとしてＣ－ｂａｎｄ（１５３０ｎｍ～１５７０ｎｍ）内のＩＴＵ－Ｇｒｉｄ波長を用いた場合、電力供給光の波長λｎ＋１～λｍは、Ｌ－ｂａｎｄ（１５７０ｎｍ～１６１０ｎｍ）内のＩＴＵ－Ｇｒｉｄ波長を用いることができる。あるいは、主信号光の波長λ１～λｎとしてＬ－ｂａｎｄ内のＩＴＵ－Ｇｒｉｄ波長を用い、電力供給光の波長λｎ＋１～λｍとして、Ｃ－ｂａｎｄ内のＩＴＵ－Ｇｒｉｄ波長を用いてもよい。 For example, in the embodiment shown in FIG. 1 described above, when the ITU-Grid wavelength in the C-band (1530 nm to 1570 nm) is used as the wavelengths λ1 to λn of the main signal light, the wavelengths λn + 1 to λm of the power supply light are ITU-Grid wavelengths within L-band (1570 nm to 1610 nm) can be used. Alternatively, the ITU-Grid wavelength in the L-band may be used as the wavelengths λ1 to λn of the main signal light, and the ITU-Grid wavelength in the C-band may be used as the wavelengths λn + 1 to λm of the power supply light.
　また、例えば、上述の図４～図７に示す実施形態において、主信号光および電力供給光の波長λ１～λｎとして、Ｃ－ｂａｎｄ内のＩＴＵ－Ｇｒｉｄ波長を用いてもよいし、Ｌ－ｂａｎｄ内のＩＴＵ－Ｇｒｉｄ波長を用いてもよい。 Further, for example, in the above-described embodiments shown in FIGS. 4 to 7, the ITU-Grid wavelength in the C-band may be used as the wavelengths λ1 to λn of the main signal light and the power supply light, or the L-band. The ITU-Grid wavelength may be used.
　本実施形態に係る光伝送システムにより子局装置に供給できる電力を簡単に試算すると、例えば、１スパン当りの伝送距離を１５ｋｍ、伝送路ファイバ損失を０．２ｄＢ／ｋｍとし、親局装置からの電力供給光の出力光パワーを１０ｄＢｍとした場合、子局装置の入力光パワーは、７ｄＢｍ(５ｍＷ)程度の電力を得ることができる。 When the power that can be supplied to the slave station device by the optical transmission system according to this embodiment is simply calculated, for example, the transmission distance per span is 15 km, the transmission line fiber loss is 0.2 dB / km, and the power from the master station device is When the output optical power of the power supply light is 10 dBm, the input optical power of the slave station apparatus can obtain power of about 7 dBm (5 mW).
　以上、本発明を実施の形態をもとに説明した。この実施の形態は例示であり、それらの各構成要素や各処理プロセスの組合せにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。 The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.
　１０，１０ａ，１０ｂ　親局装置、　１２，１３　光合波器、　１４，１５　親局光増幅器、　１６，２６　光スイッチ、　２０　子局装置、　２４　子局内電力供給装置、　２５　充電装置、　３０　中継局装置、　３２　中継光増幅器、　３６　中継局内電力供給装置、　４０　光伝送路、　４１　現用系光伝送路、　４２　予備系光伝送路、　１００　光伝送システム。 10, 10a, 10b master station device, 12, 13 optical multiplexer, 14, 15 master station optical amplifier, 16, 26 optical switch, 20 slave station device, 24 slave station power supply device, 25 charging device, 30 relay station device , 32 relay optical amplifier, 36 power supply device in relay station, 40 optical transmission line, 41 working optical transmission line, 42 standby optical transmission line, 100 optical transmission system.
　本発明は、光伝送路を介して光信号の送受信を行う光伝送システムに利用することができる。 The present invention can be used in an optical transmission system that transmits and receives an optical signal through an optical transmission line.

Claims (9)

  1. 　主信号光を出力する光送信器と、前記主信号光とは別の電力供給光を出力する電力供給用光源と、前記主信号光および前記電力供給光を増幅する光増幅器と、を備える親局装置と、
    　前記親局装置からの前記主信号光および前記電力供給光を伝送する光伝送路と、
    　前記電力供給光を光電変換することにより得られる電力を用いて、前記主信号光の受信処理を行う子局装置と、
    　を備えることを特徴とする光伝送システム。     An optical transmitter that outputs main signal light; a power supply light source that outputs power supply light different from the main signal light; and an optical amplifier that amplifies the main signal light and the power supply light. A station device;
    An optical transmission line for transmitting the main signal light and the power supply light from the master station device;
    A slave station device that performs reception processing of the main signal light using power obtained by photoelectrically converting the power supply light;
    An optical transmission system comprising:
  2. 　前記主信号光と前記電力供給光は、互いに波長が異な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 main signal light and the power supply light have different wavelengths.
  3. 　前記親局装置は、前記主信号光と前記電力供給光とを合波する光合波器をさらに備え、
    　前記光増幅器は、前記光合波器からの波長多重光を一括して増幅することを特徴とする請求項２に記載の光伝送システム。     The master station device further includes an optical multiplexer that combines the main signal light and the power supply light,
    The optical transmission system according to claim 2, wherein the optical amplifier collectively amplifies the wavelength multiplexed light from the optical multiplexer.
  4. 　前記光増幅器は、前記光送信器と前記電力供給用光源の後段にそれぞれ設けられており、
    　前記親局装置は、増幅された前記主信号光と前記電力供給光とを合波する光合波器をさらに備えることを特徴とする請求項２に記載の光伝送システム。     The optical amplifiers are provided in the subsequent stage of the optical transmitter and the power supply light source, respectively.
    The optical transmission system according to claim 2, wherein the master station device further includes an optical multiplexer that multiplexes the amplified main signal light and the power supply light.
  5. 　前記親局装置と前記子局装置との間に配置された中継局装置をさらに備え、
    　前記電力供給光は、第１波長を有する第１電力供給光と、前記第１波長と異なる第２波長を有する第２電力供給光とを含み、
    　前記光合波器は、前記主信号光、前記第１電力供給光、および前記第２電力供給光を合波した波長多重光を出力し、
    　前記中継局装置は、前記波長多重光から前記第１電力供給光を分離する第１光スイッチと、前記主信号光と前記第２電力供給光の波長多重光を増幅する中継光増幅器と、前記第１電力供給光を光電変換し、前記中継光増幅器に電力を供給する中継局内電力供給装置と、を備え、
    　前記子局装置は、前記中継局装置からの波長多重光から前記第２電力供給光を分離する第２光スイッチと、前記主信号光の受信処理を行う光受信器と、前記第２電力供給光を光電変換し、前記光受信器に電力を供給する子局内電力供給装置とを備えることを特徴とする請求項３または４に記載の光伝送システム。     A relay station device arranged between the master station device and the slave station device;
    The power supply light includes a first power supply light having a first wavelength and a second power supply light having a second wavelength different from the first wavelength,
    The optical multiplexer outputs wavelength multiplexed light obtained by combining the main signal light, the first power supply light, and the second power supply light,
    The relay station device includes: a first optical switch that separates the first power supply light from the wavelength multiplexed light; a repeater optical amplifier that amplifies the wavelength multiplexed light of the main signal light and the second power supply light; A relay station power supply device that photoelectrically converts the first power supply light and supplies power to the relay optical amplifier;
    The slave station device includes a second optical switch that separates the second power supply light from the wavelength multiplexed light from the relay station device, an optical receiver that performs reception processing of the main signal light, and the second power supply. 5. The optical transmission system according to claim 3, further comprising: a sub-station power supply device that photoelectrically converts light and supplies power to the optical receiver. 6.
  6. 　前記光伝送路は、現用系光伝送路と予備系光伝送路とにより冗長構成されており、
    　前記親局装置および前記子局装置は、前記現用系光伝送路と前記予備系光伝送路の間で運用する光伝送路の切替を行う光スイッチをさらに備え、
    　前記光スイッチは、通常運用時は前記現用系光伝送路に前記主信号光が送信され、且つ前記予備系光伝送路に前記電力供給光が送信されるよう光伝送路を選択するとともに、現用系光伝送路で障害が発生した場合は前記予備系光伝送路により前記主信号光が送信されるよう光伝送路を切り替え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 line is redundantly configured by an active optical transmission line and a standby optical transmission line,
    The master station device and the slave station device further include an optical switch that switches an optical transmission line operated between the active optical transmission line and the standby optical transmission line,
    The optical switch selects the optical transmission line so that the main signal light is transmitted to the active optical transmission line and the power supply light is transmitted to the standby optical transmission line during normal operation, and the active switch 2. The optical transmission system according to claim 1, wherein when a failure occurs in the optical transmission line, the optical transmission line is switched so that the main signal light is transmitted through the backup optical transmission line.
  7. 　前記子局装置は、通常運用時に前記電力供給光を光電変換することにより得られる電力を充電する充電装置をさらに備え、現用系光伝送路で障害が発生した場合、前記充電装置に充電された電力を用いて前記主信号光の受信処理を行うことを特徴とする請求項６に記載の光伝送システム。 The slave station device further includes a charging device that charges electric power obtained by photoelectrically converting the power supply light during normal operation, and when a failure occurs in the active optical transmission line, the charging device is charged. The optical transmission system according to claim 6, wherein reception processing of the main signal light is performed using electric power.
  8. 　前記親局装置と前記子局装置は、ポイント・トゥ・ポイントネットワークにおける端局装置として配置されることを特徴とする請求項１から７のいずれかに記載の光伝送システム。 The optical transmission system according to any one of claims 1 to 7, wherein the master station device and the slave station device are arranged as terminal devices in a point-to-point network.
  9. 　前記親局装置と前記子局装置は、光リングネットワークにおける端局装置として配置されることを特徴とする請求項１から７のいずれかに記載の光伝送システム。 The optical transmission system according to any one of claims 1 to 7, wherein the master station device and the slave station device are arranged as terminal devices in an optical ring network.
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