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WO2024214272A1 - Système de détection de fibre optique - Google Patents

Système de détection de fibre optique Download PDF

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Publication number
WO2024214272A1
WO2024214272A1 PCT/JP2023/015112 JP2023015112W WO2024214272A1 WO 2024214272 A1 WO2024214272 A1 WO 2024214272A1 JP 2023015112 W JP2023015112 W JP 2023015112W WO 2024214272 A1 WO2024214272 A1 WO 2024214272A1
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WO
WIPO (PCT)
Prior art keywords
optical
terminal
optical fiber
terminals
optical switch
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.)
Pending
Application number
PCT/JP2023/015112
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English (en)
Japanese (ja)
Inventor
大輔 飯田
千尋 鬼頭
優介 古敷谷
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 PCT/JP2023/015112 priority Critical patent/WO2024214272A1/fr
Publication of WO2024214272A1 publication Critical patent/WO2024214272A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/31—Digital deflection, i.e. optical switching

Definitions

  • This disclosure relates to optical measurement technology for measuring the condition of optical fibers.
  • Non-Patent Document 1 Optical measurement technology has been proposed to measure the condition of optical fibers (see, for example, Non-Patent Document 1).
  • test light is injected into a single fiber, and backscattered light is measured that propagates in the opposite direction from various points in the optical fiber and returns to the measuring device. This makes it possible to measure or estimate disturbances applied to the optical fiber (bending, temperature changes, strain changes, vibrations, etc.).
  • An optical fiber sensing system has been proposed that uses communication optical fibers as sensors (see, for example, Non-Patent Document 2).
  • Communication optical fibers are already laid out throughout the city, and it is expected that the state of the surrounding environment can be estimated simply by measuring them, and that this information can be used for a variety of applications.
  • optical amplifiers are connected to communication optical fibers to amplify the communication light. Because optical amplifiers only transmit light in one direction, backscattered light cannot be measured in the communication optical fiber to which the optical amplifier is connected. This has led to the problem that a communication network that includes a communication optical fiber to which an optical amplifier is connected cannot be used in an optical fiber sensing system.
  • the purpose of this disclosure is to make it possible to apply optical fiber sensing systems to communication networks that include communication optical fibers connected to optical amplifiers.
  • this disclosure by combining the optical circulator and the return function of the optical switch, it is possible to measure optical fibers in all directions connected to the optical switch with a single measurement device. As a result, this disclosure makes it possible to select all optical fibers as measurement targets even in optical switches that contain a mixture of optical amplifiers, optical isolators, etc.
  • the optical fiber sensing system disclosed herein comprises a communication network to which the optical switch disclosed herein is connected, and a measurement device connected to the communication network, which inputs test light into the communication network and measures backscattered light in at least one of the optical fibers connected to the communication network.
  • the optical fiber sensing method disclosed herein is an optical fiber sensing method using a communication network to which the optical switch disclosed herein is connected, in which a measurement device connected to the communication network inputs test light into the communication network and measures backscattered light in at least one of the optical fibers connected to the communication network.
  • the optical switch of the present disclosure comprises: An optical switch in which any one of a first plurality of terminals is connected to any one of a second plurality of terminals, an optical fiber having an optical amplifier inserted therein is connected to any one of the first plurality of terminals; a first optical circulator connected to any one of the first plurality of terminals is inserted in a position of the optical fiber farther from the optical switch than the optical amplifier is; A second optical circulator is connected to interconnect a plurality of terminals included in the second plurality of terminals.
  • the optical switch of the present disclosure comprises: a terminal connected to an optical fiber into which the optical amplifier is inserted is connected to a first terminal among terminals connected to the second optical circulator; a terminal connected to the first optical circulator is connected to a second terminal of the terminals connected to the second optical circulator; A terminal of the first plurality of terminals to which test light is incident may be connected to a third terminal of the terminals connected to the second optical circulator.
  • the optical switch of the present disclosure comprises: two of the first plurality of terminals are connected in a loop; a terminal connected to an optical fiber into which the optical amplifier is inserted is connected to a first terminal among terminals connected to the second optical circulator; a terminal connected to the first optical circulator is connected to a second terminal of the terminals connected to the second optical circulator; a terminal of the second plurality of terminals to which the test light is incident is connected to one of the terminals connected to the loop; The other terminal connected to the loop may be connected to a third terminal among the terminals connected to the second optical circulator.
  • the optical switch of the present disclosure comprises: the second optical circulator is inserted into an optical fiber connected to a terminal to which the test light is input, a terminal connected to an optical fiber into which the optical amplifier is inserted is connected to a first terminal among terminals connected to the second optical circulator; The terminal connected to the first optical circulator may be connected to a second terminal of the terminals connected to the second optical circulator.
  • the optical switch of the present disclosure may be connected to a third optical circulator that connects the terminals included in the first plurality of terminals to each other.
  • a communication network that includes a communication optical fiber connected to an optical amplifier can be made applicable to an optical fiber sensing system.
  • 1 illustrates an example embodiment of an optical fiber sensing system of the present disclosure.
  • 1 shows a basic configuration of an optical switch according to the present disclosure.
  • 1 shows a basic configuration of an optical switch according to the present disclosure.
  • 1 shows a basic configuration of an optical switch according to the present disclosure.
  • 1 illustrates an example of an optical switch including a third optical circulator according to the present disclosure.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration of the optical switch of the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • 2 shows an example of a connection configuration between optical switches according to the present embodiment.
  • Optical fiber sensing system An embodiment of the optical fiber sensing system of the present disclosure is shown in Fig. 1.
  • a measurement device 21 is connected to a communication network 100 to which a plurality of optical switches 11 are connected.
  • the optical switches 11#1 and 11#2 of this embodiment are optical switches in which any of the first plurality of terminals PI1-PIm is connected to any of the second plurality of terminals PO1-POn, and any optical switch available in the communication network 100 can be used.
  • an m ⁇ n type optical switch 11 in which m terminals PI1-PIm and n terminals PO1-POn are arranged opposite each other and the oppositely arranged terminals can be connected one-to-one will be used for explanation.
  • the measuring device 21 is a device that measures or estimates disturbances (bending, temperature changes, strain changes, vibrations, etc.) applied to the optical fiber by emitting test light and measuring the backscattered light of the test light in the optical fiber.
  • disturbances bending, temperature changes, strain changes, vibrations, etc.
  • the optical fiber sensing system of this embodiment executes the optical fiber sensing method of the present disclosure.
  • the optical fiber sensing method of the present disclosure is an optical fiber sensing method using a communication network 100 to which an optical switch 11 of the present disclosure is connected, in which a measurement device 21 connected to the communication network 100 inputs test light into the communication network 100 and measures backscattered light in at least one of the optical fibers connected to the communication network 100.
  • test light emitted from the measuring device 21 is propagated to the optical switch 11#2 via the optical switch 11#1, and the backscattered light of any optical fiber connected to the optical switch 11#2 is measured by the measuring device 21.
  • the terminal into which the test light is input and from which the backscattered light is output is the terminal P21 on the m side.
  • optical switches constituting the communication network 100 are only optical switches 11#1 and 11#2, but the present disclosure can be applied to a communication network 100 to which any number of optical switches 11 are connected. This makes it possible to perform sensing while simultaneously providing a service to a user, and to provide a high-quality service that does not stop communication for sensing.
  • FIG. 2 and 3 show the basic configuration of an optical switch according to the present disclosure.
  • an optical fiber 101 is connected to the m-side terminal
  • Fig. 3 an optical fiber 101 is connected to the n-side terminal.
  • an optical circulator 103 connected to the optical switch 11 is inserted in a position in the optical fiber 101 farther from the optical switch 11 than the optical amplifier 102.
  • the optical circulator 103 functions as a "first optical circulator" in this disclosure, and is intended to input or output light in the same direction as the communication light from terminal P101A, and to input or output light in the opposite direction to the communication light from terminal P101B. For this reason, the terminals of the optical circulator 103 are set according to the transmission direction of the communication light in the optical fiber 101.
  • the optical switch 11 is connected to an optical circulator 104 for turning back.
  • the optical circulator 104 functions as a "second optical circulator" in this disclosure, and is connected to the side opposite the terminals P101A and 101B. For example, in the example of FIG. 2, it is connected to the n-side terminal, and in the example of FIG. 3, it is connected to the m-side terminal. This forms a three-terminal turn back function with the optical circulator 104 in between.
  • terminal connected to terminal P101A functions as the "first terminal”
  • terminal connected to terminal P101B functions as the "second terminal”
  • terminal connected to terminal P21 functions as the "third terminal”.
  • loop 105 may be connected to the n-side terminal.
  • one of terminals P105A or P105B is connected to terminal P21.
  • terminals P104A, P104B, and P104C connected to optical circulator 104 the terminal connected to terminal P101A functions as the "first terminal”
  • the terminal connected to terminal P101B functions as the "second terminal”
  • the terminal connected to the other of terminals P105A or P105B functions as the "third terminal”.
  • an optical circulator 106 may be inserted into the optical fiber connected to terminal P21.
  • the optical circulator 106 functions as a "second optical circulator" in this disclosure.
  • the terminal connected to terminal P101A functions as a "first terminal”
  • the terminal connected to terminal P101B functions as a "second terminal”.
  • test light is output from one of terminals P21A and P21B to the optical switch 11, and backscattered light is output from the optical switch 11 to the other of terminals P21A and P21B.
  • the optical fiber sensing system of the present disclosure inserts an optical circulator 103 into a one-way transmission optical fiber 101 into which an optical amplifier 102 is inserted, and by using an optical circulator 104 in combination, it becomes possible to input test light into the optical fiber 101 and transfer backscattered light to a measuring device 21.
  • the present disclosure makes it possible to apply an optical fiber sensing system to an optical fiber 101 into which an optical amplifier 102 is inserted, by using an optical switch 11 equipped with optical circulators 103 and 104.
  • FIG. 5 shows an example of the optical switch 11 of this embodiment.
  • the optical switch 11 of the present disclosure may have optical circulators 23 and 25, which correspond to the optical circulator 104, connected to the terminals on both sides arranged opposite each other. If the measurement target is an optical fiber 12, the optical circulator 23 functions as the "third optical circulator” in this disclosure. If the measurement target is an optical fiber 14, the optical circulator 25 functions as the "third optical circulator” in this disclosure. As a result, a turn back function that forms three terminals by sandwiching the optical circulators 23 and 25 is configured on both the m-side terminal and the n-side terminal.
  • optical fibers 12 and 14 corresponding to optical fiber 101 may be connected to the terminals on both sides arranged opposite each other.
  • optical fibers 13 and 15 without an optical amplifier inserted may be connected to the terminals on both sides arranged opposite each other.
  • a loop 26 that can function as loop 105 may be connected.
  • the connections between the terminals in the optical switch 11 and the settings of the terminals of the optical circulators such as the optical circulators 22, 23, 24, and 25 can be switched remotely or automatically.
  • the configuration of the optical switch 11 disclosed herein it is possible to provide an optical fiber sensing system that can select and measure all optical fibers in all directions with a single measuring device 21. This is explained in detail below.
  • (First embodiment) 6 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 12, and the traveling direction of the communication light in the optical amplifier 16 is a direction away from the optical switch 11.
  • the optical circulator 22 outputs light from terminal P12A to the optical fiber 12, and outputs light from the optical fiber 12 to terminal P12B.
  • the optical switch 11 connects terminals P21 and P25A, terminals P12A and P25B, and terminals P12B and P25C.
  • the test light from the measuring device 21 is output from terminal P21 to terminal P25A.
  • the test light output to terminal P25A passes through the optical circulator 25 and is output from terminal P25B to terminal P12A. This causes the test light to be incident on the optical fiber 12.
  • the backscattered light in the optical fiber 12 passes through the optical circulator 22 and is output from terminal P12B to terminal P25C.
  • the backscattered light output to terminal P25C passes through the optical circulator 25 and is output from terminal P25A to terminal P21. This causes the backscattered light in the optical fiber 12 to be transferred from the optical switch 11 to the measuring device 21.
  • Second Embodiment 7 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 12, and the traveling direction of the communication light in the optical amplifier 16 is the direction approaching the optical switch 11.
  • the optical switch 11 connects the terminals P12B and P25B, and the terminals P12A and P25C. Therefore, the test light is output from the terminal P25B to the terminal P12B, and the backscattered light is output from the terminal P12A to the terminal P25C. Therefore, like the first embodiment, the backscattered light in the optical fiber 12 is transferred from the optical switch 11 to the measurement device 21.
  • the first and second embodiments include an optical circulator 22 that functions as a first optical circulator and an optical circulator 25 that functions as a second optical circulator, making it possible to apply an optical fiber sensing system to an optical fiber 12 into which an optical amplifier 16 is inserted and which is connected to the same side as terminal P21.
  • the optical switch 11 of the present disclosure can be adapted simply by changing the settings of the terminal of the optical circulator 22.
  • Third Embodiment 8 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 14, and the traveling direction of the communication light in the optical amplifier 17 is a direction away from the optical switch 11.
  • the optical circulator 24 outputs light from terminal P14A to the optical fiber 14, and outputs light from the optical fiber 14 to terminal P14B.
  • the optical switch 11 connects terminals P21 and P26A, terminals P23A and P26B, terminals P23B and P14A, and terminals P23C and P14B.
  • the test light from the measuring device 21 is output from terminal P21 to terminal P26A.
  • the test light output to terminal P26A is output from terminal P26B to terminal P23A.
  • the test light output to terminal P23A is output from terminal P23B to terminal P14A. This causes the test light to be incident on the optical fiber 14.
  • the backscattered light in the optical fiber 14 passes through the optical circulator 24 and is output from terminal P14B to terminal P23C.
  • the backscattered light output to terminal P23C passes through the optical circulator 23 and is output from terminal P23A to terminal P26B.
  • the backscattered light output to terminal P26B is output from terminal P26A to terminal P21.
  • the backscattered light in the optical fiber 14 is transferred from the optical switch 11 to the measuring device 21.
  • (Fourth embodiment) 9 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 14, and the traveling direction of the communication light in the optical amplifier 17 is the direction approaching the optical switch 11.
  • the optical switch 11 connects the terminals P23B and P14B, and the terminals P23C and P14A. Therefore, the test light is output from the terminal P23B to the terminal P14B, and the backscattered light is output from the terminal P14A to the terminal P23C. Therefore, like the third embodiment, the backscattered light in the optical fiber 14 is transferred from the optical switch 11 to the measurement device 21.
  • the third and fourth embodiments include an optical circulator 24 that functions as a first optical circulator and an optical circulator 23 that functions as a second optical circulator, making it possible to apply an optical fiber sensing system to an optical fiber 14 into which an optical amplifier 17 is inserted and which is connected to the side opposite the terminal 21.
  • the optical switch 11 of the present disclosure can be adapted simply by changing the settings of the terminal of the optical circulator 24.
  • Fifth Embodiment 10 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is an optical fiber 13 in which no optical amplifier is inserted.
  • Terminal P13 to which the optical fiber 13 is connected is disposed on the same m side as terminal P21.
  • the optical switch 11 connects terminals P21 and P26A, and terminals P13 and P26B.
  • the test light from the measuring device 21 is output from terminal P21 to terminal P26A.
  • the test light output to terminal P26A is output from terminal P26B to terminal P13. This causes the test light to be incident on the optical fiber 13.
  • the backscattered light in the optical fiber 13 is output from terminal P13 to terminal P26B.
  • the backscattered light output to terminal P26B is output from terminal P26A to terminal P21. This causes the backscattered light in the optical fiber 13 to be transferred from the optical switch 11 to the measuring device 21.
  • Sixth Embodiment 11 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is an optical fiber 15 in which no optical amplifier is inserted.
  • a terminal P15 to which the optical fiber 15 is connected is disposed on the n-side opposite to the terminal P21.
  • the optical switch 11 connects the terminals P21 and P15.
  • the test light from the measuring device 21 is output from terminal P21 to terminal P15. This causes the test light to be incident on the optical fiber 12.
  • the backscattered light in the optical fiber 15 is output from terminal P15 to terminal P26B.
  • the backscattered light output to terminal P26B is output from terminal P15 to terminal P21. This causes the backscattered light in the optical fiber 15 to be transferred from the optical switch 11 to the measuring device 21.
  • any optical fiber connected to the optical switch 11 can be applied to the optical fiber sensing system by using only one terminal P21 as an input/output terminal.
  • Seventh Embodiment 12 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 14, and the traveling direction of the communication light in the optical amplifier 17 is a direction away from the optical switch 11.
  • the optical circulator 24 outputs light from a terminal P14A to the optical fiber 14, and outputs light from the optical fiber 14 to a terminal P14B.
  • an optical circulator 27 functioning as a second optical circulator is inserted into an optical fiber connected to the terminal to which the test light is incident.
  • the optical switch 11 of this embodiment includes a terminal P21A that outputs the test light to terminal P14A, a terminal P21B for transferring the backscattered light from terminal P14B to the measuring device 21, and an optical circulator 27 that connects terminals P21A and P21B.
  • the optical switch 11 connects terminals P21A and P14A, and terminals P21B and P14B.
  • the test light from the measuring device 21 passes through the optical circulator 27 and is output from terminal P21A to terminal P14A. This causes the test light to be incident on the optical fiber 14.
  • the backscattered light in the optical fiber 14 passes through the optical circulator 24 and is output from terminal P14B to terminal 21B.
  • the backscattered light output to terminal P21B is transferred to the measuring device 21 via the optical circulator 27.
  • the backscattered light in the optical fiber 14 is transferred from the optical switch 11 to the measuring device 21.
  • Eighth embodiment 13 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 14, and the traveling direction of the communication light in the optical amplifier 17 is the direction approaching the optical switch 11.
  • the optical switch 11 connects the terminals P21A and P14B, and the terminals P21B and P14A. Therefore, the test light is output from the terminal P21A to the terminal P14B, and the backscattered light is output from the terminal P14A to the terminal P21B. Therefore, like the seventh embodiment, the backscattered light in the optical fiber 14 is transferred from the optical switch 11 to the measuring device 21.
  • the seventh and eighth embodiments include an optical circulator 24 that functions as a first optical circulator and an optical circulator 27 that functions as a second optical circulator, making it possible to apply an optical fiber sensing system to an optical fiber 14 into which an optical amplifier 17 is inserted and which is connected to the side opposite terminals P21A and P21B.
  • the optical switch 11 of the present disclosure can be adapted simply by changing the settings of the terminals of the optical circulator 24 and the connections of the optical switch 11.
  • Ninth embodiment 14 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 12, and the traveling direction of the communication light in the optical amplifier 16 is a direction away from the optical switch 11.
  • the optical circulator 22 outputs light from a terminal P12A to the optical fiber 12, and outputs light from the optical fiber 12 to a terminal P12B.
  • the optical switch 11 also includes an optical circulator 27.
  • the optical switch 11 connects terminals P21A and P26A, terminals P21B and P25B, terminals P12A and P26B, and terminals P12B and 25A.
  • the test light from the measuring device 21 is output from terminal P21A to terminal P26A.
  • the test light output to terminal P26A is output from terminal P26B to terminal P12A. This causes the test light to be incident on the optical fiber 12.
  • the backscattered light in the optical fiber 12 passes through the optical circulator 22 and is output from terminal P12B to terminal P25A.
  • the backscattered light output to terminal P25A passes through the optical circulator 25 and is output from terminal P25B to terminal P21B. This causes the backscattered light in the optical fiber 12 to be transferred from the optical switch 11 to the measuring device 21.
  • Tenth Embodiment 15 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is the optical fiber 12, and the traveling direction of the communication light in the optical amplifier 16 is the direction approaching the optical switch 11.
  • the optical switch 11 connects the terminals P12A and P25A, and the terminals P12B and P26B. Therefore, the test light is output from the terminal P26B to the terminal P12B, and the backscattered light is output from the terminal P12A to the terminal P25A. Therefore, similar to the ninth embodiment, the backscattered light in the optical fiber 12 is transferred from the optical switch 11 to the measurement device 21.
  • the ninth and tenth embodiments include an optical circulator 22 that functions as a first optical circulator and an optical circulator 25 that functions as a second optical circulator, and two of the n-side terminals are connected by a loop 26, so that even in an optical switch 11 that includes an optical circulator 27, it is possible to apply an optical fiber sensing system to an optical fiber 12 into which an optical amplifier 16 is inserted and which is connected to the same side as terminals P21A and P21B.
  • the optical switch 11 of the present disclosure can be adapted simply by changing the settings of the terminals of the optical circulator 22 and the connections of the optical switch 11.
  • Eleventh Embodiment 16 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is an optical fiber 13 in which no optical amplifier is inserted.
  • a terminal P13 to which the optical fiber 13 is connected is arranged on the same m-side as the terminal P21.
  • the optical switch 11 also includes an optical circulator 27, and an optical circulator 25 at the n-side terminal.
  • the optical switch 11 connects terminals P21A and P25C, terminals P12B and P25B, and terminals P13 and P25A.
  • the test light from the measuring device 21 is output from terminal P21A to terminal P25C.
  • the test light output to terminal P25C is output from terminal P25A to terminal P13 via the optical circulator 25. This causes the test light to be incident on the optical fiber 13.
  • the backscattered light in the optical fiber 13 is output from terminal P13 to terminal P25A.
  • the backscattered light output to terminal P25A is output from terminal P25B to terminal P21B via the optical circulator 25. This causes the backscattered light in the optical fiber 13 to be transferred from the optical switch 11 to the measuring device 21.
  • Twelfth embodiment 17 shows an example of a connection configuration of the optical switch 11 of this embodiment.
  • the measurement target is an optical fiber 15 in which no optical amplifier is inserted.
  • a terminal P15 to which the optical fiber 15 is connected is disposed on the n-side opposite to a terminal P21.
  • optical circulators 23 and 25 and a loop 26 are also provided.
  • the optical switch 11 connects terminals P21A and P26A, terminals P21B and P25A, terminals P23A and P15, terminals P23B and P25C, and terminals P23C and P26B.
  • the test light from the measuring device 21 is output from terminal P21A to terminal P26A.
  • the test light output to terminal P26A is output from terminal P26B to terminal P23C.
  • the test light output to terminal P23C is output from terminal P23A to P15 via the optical circulator 23. This causes the test light to be incident on the optical fiber 15.
  • the backscattered light in the optical fiber 15 is output from terminal P15 to terminal P23A.
  • the backscattered light output to terminal P23A passes through the optical circulator 23 and is output from terminal P23B to terminal P25C.
  • the backscattered light output to terminal P25CA passes through the optical circulator 25 and is output from terminal P25A to terminal P21B. In this way, the backscattered light in the optical fiber 15 is transferred from the optical switch 11 to the measuring device 21.
  • any optical fiber connected to the optical switch 11 can be applied to the optical fiber sensing system, even if an optical circulator 27 is inserted in the optical fiber connected to the terminal where the test light is incident.
  • the optical switch 11#1 is connected as in the sixth embodiment, and the optical fiber 15 connected to the optical switch 11#1 is connected to the terminal P21 of the optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 15 to propagate the test light from the measuring device 21 from the optical switch 11#1 to the optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be transferred from terminal P21 of optical switch 11#2 to optical switch 11#1. Therefore, any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system. Note that in addition to the optical fiber connected to optical switch 11#2, optical fiber 15 connecting optical switches 11#1 and 11#2 may also be used in the optical fiber sensing system.
  • the optical switch 11#1 is connected as in the third embodiment, and the optical fiber 14 connected to the optical switch 11#1 is connected to the optical circulator 27 of the optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 14 to propagate the test light from the measurement device 21 from the optical switch 11#1 to the optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system.
  • the optical fiber 14 connecting optical circulators 24 and 27 may also be used in the optical fiber sensing system.
  • optical switch 11#1 is connected as in the twelfth embodiment, and the optical fiber 15 connected to optical switch 11#1 is connected to terminal P21 of optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 15 to propagate test light from the measurement device 21 from optical switch 11#1 to optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be transferred from terminal P21 of optical switch 11#2 to optical switch 11#1. Therefore, any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system. Note that in addition to the optical fiber connected to optical switch 11#2, optical fiber 15 connecting optical switches 11#1 and 11#2 may also be used in the optical fiber sensing system.
  • the optical switch 11#1 is connected as in the seventh embodiment, and the optical fiber 14 connected to the optical switch 11#1 is connected to the optical circulator 27 of the optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 14 to propagate the test light from the measurement device 21 from the optical switch 11#1 to the optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system.
  • the optical fiber 14 connecting optical circulators 24 and 27 may also be used in the optical fiber sensing system.
  • optical switch 11#2 is connected to the n-side terminal of the optical switch 11#1
  • the optical switch 11#2 may be connected to the m-side terminal of the optical switch 11#1.
  • the m-side terminal of the optical switch 11#2 is disposed on the optical switch 11#1 side.
  • optical switch 11#1 is connected as in the fifth embodiment, and the optical fiber 13 connected to optical switch 11#1 is connected to terminal P21 of optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 13 to propagate test light from the measurement device 21 from optical switch 11#1 to optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be transferred from terminal P21 of optical switch 11#2 to optical switch 11#1. Therefore, any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system. Note that in addition to the optical fiber connected to optical switch 11#2, the optical fiber 13 connecting optical switches 11#1 and 11#2 may also be used in the optical fiber sensing system.
  • the optical switch 11#1 is connected as in the first embodiment, and the optical fiber 12 connected to the optical switch 11#1 is connected to the optical circulator 27 of the optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 12 to propagate the test light from the measurement device 21 from the optical switch 11#1 to the optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system.
  • the optical fiber 12 connecting optical circulators 22 and 27 may also be used in the optical fiber sensing system.
  • optical switch 11#1 is connected as in the eleventh embodiment, and the optical fiber 13 connected to optical switch 11#1 is connected to terminal P21 of optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 13 to propagate test light from the measurement device 21 from optical switch 11#1 to optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be transferred from terminal P21 of optical switch 11#2 to optical switch 11#1. Therefore, any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system. Note that in addition to the optical fiber connected to optical switch 11#2, the optical fiber 13 connecting optical switches 11#1 and 11#2 may also be used in the optical fiber sensing system.
  • the optical switch 11#1 is connected as in the tenth embodiment, and the optical fiber 12 connected to the optical switch 11#1 is connected to the optical circulator 27#2 of the optical switch 11#2.
  • the optical fiber sensing system of this embodiment can use the optical fiber 12 to propagate the test light from the measurement device 21 from the optical switch 11#1 to the optical switch 11#2.
  • any optical fiber connected to optical switch 11#2 can be used in the optical fiber sensing system.
  • the optical fiber 12 connecting optical circulators 22 and 27#2 may also be used in the optical fiber sensing system.
  • the optical fiber sensing system of the present disclosure includes the optical switch 11 of the present disclosure, and therefore can use test light from a single measuring device 21 to measure backscattered light in optical fibers connected to n ⁇ m (n, m: number of terminals) terminals of the optical switch 11 with the measuring device 21. Therefore, by employing the optical switch 11 of the present disclosure in an optical switch that connects optical fibers already laid throughout the city, the present disclosure can measure or estimate disturbances (bending, temperature changes, strain changes, vibrations, etc.) applied to the optical fibers already laid throughout the city with only a single measuring device 21.
  • disturbances bending, temperature changes, strain changes, vibrations, etc.
  • Optical switch 21 Measuring device 12-15, 101, Optical fiber 16, 17, 102: Optical amplifier 22-25, 27, 103, 104, 106: Optical circulator 26, 105: Loop 100: Communication network

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Communication System (AREA)

Abstract

Un système de détection de fibre optique selon la présente divulgation comprend : un réseau de communication auquel est connecté un commutateur optique, dans lequel l'une quelconque d'une pluralité de premières bornes est connectée à l'une quelconque d'une pluralité de secondes bornes ; et un dispositif de mesure qui est connecté au réseau de communication, amène la lumière de test à entrer dans le réseau de communication, et mesure la lumière rétrodiffusée dans au moins l'une des fibres optiques connectées au réseau de communication. Dans le commutateur optique, une fibre optique dans laquelle un amplificateur optique est inséré est connectée à l'une quelconque de la pluralité de premières bornes, et un premier circulateur optique à connecter à l'une quelconque de la pluralité de premières bornes est inséré à une position plus éloignée du commutateur optique que l'amplificateur optique à l'intérieur de la fibre optique.
PCT/JP2023/015112 2023-04-14 2023-04-14 Système de détection de fibre optique Pending WO2024214272A1 (fr)

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PCT/JP2023/015112 WO2024214272A1 (fr) 2023-04-14 2023-04-14 Système de détection de fibre optique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0451620A (ja) * 1990-06-19 1992-02-20 Sumitomo Electric Ind Ltd 光通信システム
JPH11119173A (ja) * 1997-10-17 1999-04-30 Nippon Telegr & Teleph Corp <Ntt> 光波長選択フィルタおよび光波長同調型トランシーバ
US20170205253A1 (en) * 2014-07-25 2017-07-20 Fotech Solutions Limited Distributed Optical Fibre Sensors
US20190025095A1 (en) * 2016-01-20 2019-01-24 Fotech Solutions Limited Distributed Optical Fibre Sensors
JP2022031310A (ja) * 2017-07-26 2022-02-18 テッラ１５ プロプライエタリー リミテッド 分布光学センシングシステム及び方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0451620A (ja) * 1990-06-19 1992-02-20 Sumitomo Electric Ind Ltd 光通信システム
JPH11119173A (ja) * 1997-10-17 1999-04-30 Nippon Telegr & Teleph Corp <Ntt> 光波長選択フィルタおよび光波長同調型トランシーバ
US20170205253A1 (en) * 2014-07-25 2017-07-20 Fotech Solutions Limited Distributed Optical Fibre Sensors
US20190025095A1 (en) * 2016-01-20 2019-01-24 Fotech Solutions Limited Distributed Optical Fibre Sensors
JP2022031310A (ja) * 2017-07-26 2022-02-18 テッラ１５ プロプライエタリー リミテッド 分布光学センシングシステム及び方法

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