WO2023228394A1 - 光通信システム、光ノード、及び光給電方法 - Google Patents

光通信システム、光ノード、及び光給電方法 Download PDF

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Publication number
WO2023228394A1
WO2023228394A1 PCT/JP2022/021668 JP2022021668W WO2023228394A1 WO 2023228394 A1 WO2023228394 A1 WO 2023228394A1 JP 2022021668 W JP2022021668 W JP 2022021668W WO 2023228394 A1 WO2023228394 A1 WO 2023228394A1
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WO
WIPO (PCT)
Prior art keywords
optical
light
wavelength
controller
node
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/021668
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English (en)
French (fr)
Japanese (ja)
Inventor
友裕 川野
晃弘 黒田
栄伸 廣田
和英 中江
ひろし 渡邉
和典 片山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2024522860A priority Critical patent/JP7782689B2/ja
Priority to US18/864,871 priority patent/US20250317217A1/en
Priority to PCT/JP2022/021668 priority patent/WO2023228394A1/ja
Publication of WO2023228394A1 publication Critical patent/WO2023228394A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • 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
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Definitions

  • the present disclosure relates to an optical communication system that optically supplies power to an optical node, an optical node thereof, and an optical power supply method thereof.
  • Optical fiber networks especially access networks that connect telecommunications carriers and optical terminals, require optical fibers to be connected to arbitrary routes or changed routes in order to use equipment efficiently during installation and maintenance. Route switching is performed at a certain frequency. Normally, this kind of work requires going to the site and physically changing the connection, but a technology has been proposed in which this can be done remotely using an optical switch.
  • Non-Patent Document 1 reports a technology that connects and controls a communication building in which a laser is installed and a plurality of optical nodes that operate optical switches remotely using a single optical fiber.
  • a self-holding optical switch is installed in the optical node, and a single laser enables optical power supply to multiple optical nodes and communication with the optical nodes.
  • Non-Patent Document 1 has a problem in that when the stored energy of the optical node disappears for some reason, the aforementioned optical switch cannot be controlled, making it difficult to perform optical power supply and communicate with the optical node. .
  • the present invention aims to provide an optical communication system, an optical node, and an optical power supply method that can prevent the stored energy of each optical node from disappearing.
  • the optical communication system according to the present invention makes it possible to use different optical power feeding wavelengths for each optical node and simultaneously optically feed power to all optical nodes.
  • the optical communication system is an optical communication system in which a plurality of optical nodes are connected in series with optical fibers from an upstream controller to a downstream direction, and the controller supplies optical power to the optical nodes.
  • the controller inputs wavelength-multiplexed light, which is a combination of lights of different wavelengths for each optical node, into the optical fiber;
  • the optical node is an optical branching unit that branches and extracts the wavelength-multiplexed light assigned to itself from among the wavelength-multiplexed light from the upstream side, and outputs the wavelength-multiplexed light containing other wavelengths to the downstream side; a photoelectric conversion unit that charges a storage battery with light of a wavelength branched by the light branching unit; It is characterized by having the following.
  • the optical node according to the present invention is each optical node in which a plurality of optical nodes are connected in series with an optical fiber from an upstream controller to a downstream direction, and optical power is supplied from the controller,
  • the controller branches and extracts the light of the wavelength assigned to itself from the wavelength multiplexed light that is multiplexed with light of different wavelengths for each of the optical nodes input to the optical fiber, and extracts the light of the wavelength that includes other wavelengths.
  • an optical branching section that outputs multiplexed light to the downstream side; a photoelectric conversion unit that charges a storage battery with light of a wavelength branched by the light branching unit; It is characterized by having the following.
  • the optical power supply method according to the present invention is an optical power supply method performed from the controller to the optical node in an optical communication system in which a plurality of optical nodes are connected in series with optical fibers from an upstream controller to a downstream direction.
  • the controller branches and extracts the light of the wavelength assigned to itself from the wavelength multiplexed light that is multiplexed with light of different wavelengths for each of the optical nodes input to the optical fiber, and extracts the light of the wavelength that includes other wavelengths.
  • Outputting multiplexed light to the downstream side It is characterized by charging its own storage battery with the branched light of the wavelength assigned to itself.
  • the controller transmits wavelength-multiplexed light, which combines lights of different wavelengths for each optical node, to the optical fiber.
  • Each optical node is configured with an exclusive specific wavelength.
  • Each optical node uses a wavelength filter to extract light of a wavelength set for itself from the wavelength-multiplexed light transmitted from the upstream side of the optical fiber, and uses it for optical power supply. Therefore, the controller can simultaneously supply optical power to all optical nodes.
  • the present invention can provide an optical communication system, an optical node, and an optical power feeding method that can avoid the loss of stored energy in each optical node.
  • the logical connection between the communication building and the optical node is one-to-one, so while communicating with one optical node, it is not possible to communicate with other nodes, and all Another problem is that it is difficult to manage the excess or deficiency of optical power supply for optical nodes. Furthermore, in the case of the system of Non-Patent Document 1, while communicating with one optical node, other optical nodes cannot be constantly monitored, so there is also the problem that it is difficult to improve the efficiency of optical power supply.
  • the optical node of the optical communication system according to the present invention further includes a control unit that grasps the power storage status of the storage battery and notifies the controller to adjust the light intensity of the light of the wavelength assigned to the optical node. It is characterized by Further, the optical node of the optical communication system according to the present invention includes an optical receiver that receives light of a wavelength assigned to the optical node and modulated by the controller, and an optical receiver that receives light of a wavelength assigned to the optical node and modulated by the controller; The controller further includes a modulator that modulates the light having the wavelength and transmits the modulated light to the controller.
  • this optical communication system since wavelength multiplexed light is used, the controller can communicate with all optical nodes simultaneously by modulating this light. Therefore, this optical communication system can constantly monitor all optical nodes and manage excess or deficiency of optical power supply. In particular, it is possible to improve energy efficiency by increasing the light intensity of wavelengths directed to optical nodes where stored energy is decreasing and decreasing the light intensity of wavelengths directed to optical nodes where stored power is sufficient. .
  • the optical node of the optical communication system according to the present invention is characterized in that it includes two of the storage batteries, one of the storage batteries is for a load, and the other of the storage batteries is for the control unit.
  • the present invention can provide an optical communication system, an optical node, and an optical power supply method that can prevent the stored energy of each optical node from disappearing. According to the present invention, by preparing a corresponding number of lasers for multiple optical nodes, multiplexing and transmitting the signals, a single optical fiber can simultaneously provide optical power supply function and optical communication to multiple optical nodes.
  • a highly reliable optical communication system can be provided because functions can be realized simultaneously and communication with optical nodes can be performed at any timing.
  • FIG. 1 is a diagram illustrating the configuration of an optical communication system and an optical node according to the present invention.
  • FIG. 3 is a diagram illustrating an optical power feeding method according to the present invention. It is a figure explaining the voltage curve by charging of a storage battery.
  • FIG. 1 is a diagram illustrating the configuration of an optical communication system 301 and an optical node 1 of this embodiment.
  • a plurality of optical nodes (1-1, 1-2, 1-3, . . . ) are connected in series through optical fibers 2 from an upstream controller 13 to a downstream direction, and the controller 13 connects each optical node in the downstream direction.
  • Optical power is supplied to the nodes (1-1, 1-2, 1-3, . . . ).
  • optical node 1 when explaining individual optical nodes, they are distinguished by using codes such as 1-1, 1-2, 1-3, etc., and content common to all optical nodes is When explaining, it is written as "optical node 1".
  • individual optical fibers when explaining individual optical fibers, they are distinguished by using codes such as 2-0, 2-1, 2-2, 2-3, etc., and the content common to all optical fibers is When explaining, it is written as "optical fiber 2".
  • the direction of the controller 13 will be described as "upstream”, and the direction toward the optical node 1-1, optical node 1-2, optical node 1-3, . . . will be described as "downstream”.
  • the controller 13 inputs wavelength-multiplexed light obtained by combining lights of different wavelengths for each optical node 1 to the optical fiber 2-0.
  • the controller 13 includes a control unit 11, a first power feeding laser 3-1 that outputs light of a first wavelength, and a first power feeding laser 3-1 that outputs light of a second wavelength different from the first wavelength.
  • the controller 13 is installed in a communication building where power can be secured. Laser beams emitted from the first power feeding laser 3 and the second power feeding laser 4 are input to the optical fiber 2-0 via the WDM coupler 9 and the optical circulator 12.
  • the number of power feeding lasers is two, but the number of power feeding lasers is increased or decreased depending on the number of optical nodes.
  • the optical node 1 is installed, for example, in a place where there is no power supply. Each optical node 1 is connected in series from a controller 13 by optical fibers (2-0, 2-1, 2-2, 2-3, . . . ). As described above, the optical communication system 301 is characterized in that a plurality of optical nodes 1 are connected in series to one controller device 13 via the optical fiber 2.
  • the optical node 1 is an optical branching section (wavelength filter 23) that branches and extracts the wavelength-multiplexed light assigned to itself from among the wavelength-multiplexed light from the upstream side, and outputs the wavelength-multiplexed light containing other wavelengths to the downstream side; a photoelectric conversion unit (photoelectric conversion elements 24, 30) that charges a storage battery (26, 27) with light of a wavelength branched by the light branching unit; Equipped with.
  • the optical node 1 uses a wavelength filter 23 to extract only the light of the wavelength assigned to the optical node from the wavelength-multiplexed downstream light from the optical fiber 2, converts it into electric power using a photoelectric conversion element, and stores the electricity in a storage battery. Then, driving power is supplied from the storage battery to all active elements (optical switch 31, etc.) included in the optical node.
  • the optical branching unit 20 is a branching ratio coupler, and has a branching ratio of, for example, 90:10 or 99:1, and branches more optical power to the photoelectric conversion element 24 for power feeding.
  • the photoelectric conversion element 24 is made of an element suitable for communication in the long wavelength band of 1300 nm to 1600 nm, for example, indium gallium arsenide. Photoelectric conversion elements with an open circuit voltage of 5 V or less and a conversion efficiency of about 30% are easily available. For this reason, the wavelength of light output by each laser of the controller 13 is set to a wavelength corresponding to the photoelectric conversion element.
  • the device power storage unit 27 stores electrical energy converted by the photoelectric conversion element 24.
  • the device power storage unit 27 is, for example, an electric double layer capacitor. Note that when supplying voltage to each active element, the supply voltage is adjusted as appropriate by a booster circuit 28 (DC/DC converter, etc.).
  • the light with low optical power branched by the optical branching section 20 is guided to the optical branching section 22 via the optical circulator 21 and input to the photoelectric conversion element 30 for receiving optical signals and the upstream communication section 29.
  • the photoelectric conversion element 30 receives a control signal from the controller 13.
  • the upstream communication unit 29 is an optical switch that can control ON/OFF to attenuate or not attenuate a part of the downstream light, and modulates the upstream communication light directed to the controller 13 .
  • the uplink communication section 29 is desirably one that operates at low voltage and with extremely low power consumption of several nW or less. For example, an electrostatically driven MEMS optical switch that requires low driving power and is generally available may be used. is possible.
  • the optical node 1 has a microcontroller 25 for control.
  • the microcontroller 25 is mainly composed of four functions (1) to (4).
  • (1) Downlink frame analysis function The microcontroller 25 analyzes the downlink frame included in the downlink light from the controller 13 received by the photoelectric conversion element 30. The frame includes a request for node information, an execution instruction regarding switching, and the like.
  • (2) Uplink signal generation function The microcontroller 25 modulates the uplink communication section 29 to generate uplink signal light in cooperation with the downlink frame analysis function.
  • (3) Optical switch operation control function The microcontroller 25 cooperates with the downlink frame analysis function, reads instructions from the controller 13, and operates the optical switch 31 for switching communication services.
  • (4) Power monitoring function The microcontroller 25 monitors the amount of energy stored in the storage battery 27. The microcontroller 25 always grasps the amount of energy stored in the storage battery 27 via a voltage monitor or the like, and notifies the controller 13 via the signal generation function based on a set threshold value.
  • the microcontroller 25 is characterized in that the optical node itself manages the amount of stored energy, communicates with the controller 13, and receives execution instructions from the controller 13 by coordinating the four functions described above. shall be.
  • the optical node 1 includes two storage batteries.
  • One of the storage batteries (storage battery 27) is used for the load (active element such as the optical switch 31), and the other storage battery (storage battery 26) is used for the control unit (microcontroller 25, etc.). It is preferable that it is for the uplink communication section 29).
  • the optical node 1 has a microcontroller power storage unit 26 for driving the microcontroller 25 and the upstream communication unit 29, in addition to the device power storage unit 27.
  • a microcontroller power storage unit 26 for driving the microcontroller 25 and the upstream communication unit 29, in addition to the device power storage unit 27.
  • the microcontroller 25 may be reset.
  • the optical switch 1 can control which storage battery (26 or 27) is used to store electricity using the load switch A 32.
  • the optical switch 1 since the optical node 1 needs to be driven with a small amount of power, it is sufficient to supply power to and drive power-consuming devices such as the booster circuit 28 and the optical switch 31 only when necessary. Therefore, the optical switch 1 includes a load switch O 33 and a load switch C 34.
  • the booster circuit 28 is driven only when the load switch Otsu 33 is ON.
  • Each load switch is arranged on the power supply line from the device power storage unit 27 so that the optical switch 31 is driven only when the load switch No. 34 is ON.
  • the microcontroller 25 of the optical node 1 grasps the power storage status of the storage battery 27 and sends a notification to the controller 13 to adjust the light intensity of the light of the wavelength assigned to itself.
  • FIG. 2 is a flowchart for explaining the power monitoring function.
  • the control unit 11 of the controller 13 monitors and understands the amount of electricity stored in each optical node 1 by inquiring about the amount of electricity stored (step S01).
  • the control unit 11 (“No” in step S02)
  • the output of the power feeding laser 3-x corresponding to the optical node 1-x is increased within the upper limit of the light intensity that can be input to the optical fiber 2 (step S03).
  • control unit 11 determines that the power amount of the device power storage unit 27 of any optical node 1-x (x is 1, 2, 3, . . . ) is not insufficient (“Yes” in step S02). , and if there is a surplus (“Yes” in step S04), the output of the power feeding laser 3-x corresponding to the optical node 1-x is lowered (step S05). In other cases (“No” in step S04), the control unit 11 maintains the output of the power feeding laser corresponding to the optical node (step S06).
  • FIG. 3 is a diagram illustrating a voltage curve due to charging of the device storage battery 27.
  • the output voltage of the storage battery 27 passes through the voltage Va that can operate the optical switch 31, and then the output voltage of the photoelectric conversion element 24. It approaches Vb infinitely.
  • the rate of increase in voltage becomes slower.
  • a state where the output voltage of the storage battery 27 is higher than the voltage Va that can operate the optical switch is a "sufficient power state”
  • the output voltage of the storage battery 27 is the output voltage Vb of the photoelectric conversion element 24.
  • a state close to , for example, a state where the voltage value is 90% of the output voltage Vb of the photoelectric conversion element 24 is defined as "a state where there is a surplus in electric energy”.
  • a state in which the output voltage of the storage battery 27 is lower than the voltage Va at which the optical switch can be operated is defined as a "state in which the amount of electric power is insufficient".
  • the control unit 11 can adjust the output of the power supply laser and optimally supply power to the optical node 1. becomes.
  • the excess or deficiency of the storage battery may be similarly applied to the storage battery 26 for the microcontroller.
  • the optical communication system transmits a plurality of downlink laser beams supplied from the controller 13 to each optical node 1 through a single path (optical fiber 2).
  • the optical power as power for power supply to each optical node 1
  • it is used as a control signal for each optical node 1 to control power management of the node and control the optical power of the node.
  • It is characterized in that it is used for both controlling the switch 31. Therefore, the present invention can simultaneously realize optical power supply and optical switch control functions for a plurality of optical nodes using a single path, and can provide a highly reliable optical node system.
  • each optical node is assigned a unique wavelength, and each optical node is equipped with a wavelength filter that extracts the wavelength, so it is possible to operate each optical node individually. Therefore, it is easy to expand the system by increasing the number of optical nodes included in the system.
  • the light transmitted to multiple optical nodes has different wavelengths, there is no interference with uplink signals emitted to the communication building side, and it is possible to receive them at any timing. Therefore, it is possible to quickly respond to alarms from optical nodes, for example, and it is possible to provide an optical node system with quick response.
  • the laser output of the optical power supply light supplied to each optical node can be individually varied depending on the amount of electricity stored in the optical node and the necessity of optical switch operation. For this reason, by suppressing the output of the corresponding laser for optical nodes that use less power, the power amount of the power supply optical laser inside the facility is suppressed, and for optical nodes that have a small amount of stored power, the output of the corresponding power supply laser is reduced. By increasing the battery voltage, it is possible to charge quickly and quickly respond to requests for optical switch operation.
  • Optical node 2 1, 1-1, 1-2, 1-3, ...: Optical node 2, 2-0, 2-1, 2-2, 2-3, ...: Optical fiber 3-1, 3- 2,...: Power feeding laser 5: First modulator 6: Second modulator 7: First optical receiver 8: Second optical receiver 9: WDM coupler 10: WDM coupler 11: Control Part 12: Optical circulator 13: Controller 20: Optical coupler 21: Optical circulator 22: Optical coupler 23: Wavelength filter 24: Photoelectric conversion element 25: Microcontroller 26: Storage battery for microcontroller 27: Storage battery for device 28: Boost circuit 29: Upstream communication section 30: Photoelectric conversion element 31: Optical switch 32: Load switch A 33: Load switch O 34: Load switch C 301: Optical communication system

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Optical Communication System (AREA)
PCT/JP2022/021668 2022-05-27 2022-05-27 光通信システム、光ノード、及び光給電方法 Ceased WO2023228394A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2024522860A JP7782689B2 (ja) 2022-05-27 2022-05-27 光通信システム、光ノード、及び光給電方法
US18/864,871 US20250317217A1 (en) 2022-05-27 2022-05-27 Optical communication system, optical node, and optical power supply method
PCT/JP2022/021668 WO2023228394A1 (ja) 2022-05-27 2022-05-27 光通信システム、光ノード、及び光給電方法

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025180A (ja) * 1999-07-06 2001-01-26 Nippon Telegr & Teleph Corp <Ntt> 光パワー給電装置
WO2011158283A1 (ja) * 2010-06-14 2011-12-22 富士通テレコムネットワークス株式会社 光伝送システム
JP2018042170A (ja) * 2016-09-09 2018-03-15 日本電信電話株式会社 光通信システム及び給電方法
WO2021075196A1 (ja) * 2019-10-18 2021-04-22 京セラ株式会社 受電装置、給電装置及び光ファイバー給電システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025180A (ja) * 1999-07-06 2001-01-26 Nippon Telegr & Teleph Corp <Ntt> 光パワー給電装置
WO2011158283A1 (ja) * 2010-06-14 2011-12-22 富士通テレコムネットワークス株式会社 光伝送システム
JP2018042170A (ja) * 2016-09-09 2018-03-15 日本電信電話株式会社 光通信システム及び給電方法
WO2021075196A1 (ja) * 2019-10-18 2021-04-22 京セラ株式会社 受電装置、給電装置及び光ファイバー給電システム

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JPWO2023228394A1 (https=) 2023-11-30
US20250317217A1 (en) 2025-10-09

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