WO2022249456A1 - 光モニタデバイス及び光強度測定方法 - Google Patents

光モニタデバイス及び光強度測定方法 Download PDF

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Publication number
WO2022249456A1
WO2022249456A1 PCT/JP2021/020452 JP2021020452W WO2022249456A1 WO 2022249456 A1 WO2022249456 A1 WO 2022249456A1 JP 2021020452 W JP2021020452 W JP 2021020452W WO 2022249456 A1 WO2022249456 A1 WO 2022249456A1
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WO
WIPO (PCT)
Prior art keywords
light
optical
incident
intensity
optical fibers
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Ceased
Application number
PCT/JP2021/020452
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English (en)
French (fr)
Japanese (ja)
Inventor
良 小山
宜輝 阿部
和典 片山
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to PCT/JP2021/020452 priority Critical patent/WO2022249456A1/ja
Priority to JP2023523915A priority patent/JP7609268B2/ja
Publication of WO2022249456A1 publication Critical patent/WO2022249456A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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

Definitions

  • the present disclosure relates to an optical monitor device, and more particularly to an optical monitor device for detecting the intensity of light in an optical transmission device and feeding back the detection result to other components.
  • Optical fiber communication often uses the detection of the intensity of light propagating through an optical fiber to control communication and confirm the soundness of equipment. For example, in an access network, test light is propagated through an optical fiber, and the optical intensity is detected to check the loss and soundness of the optical fiber, as well as the target and connection of the core wires.
  • WDM Widelength Division Multiplexing
  • Patent Literature 1 describes a technique for splitting light at a constant splitting ratio using two parallel waveguides, which makes it possible to measure the intensity and propagation loss of optical signals in an access network.
  • Patent Document 2 describes a technique for simultaneously monitoring the intensity of optical signals of a plurality of optical fibers by combining one-dimensionally arranged optical fibers and a dielectric multilayer film.
  • optical monitor device with the conventional arrangement configuration still has the following problems.
  • the optical fiber and the light intensity sensor correspond one-to-one, and it is necessary to arrange the sensor and the optical fiber at the same pitch. Furthermore, it is necessary to precisely position the optical fiber so that the light from the optical fiber is incident on the sensor.
  • Patent No. 3450104 (Furukawa Electric) Japanese Patent Application Laid-Open No. 2004-219523 (Fujitsu, withdrawn)
  • the present disclosure has been made in view of these points, and aims to provide a compact optical monitor device with several tens of cores that can be manufactured at low cost.
  • the optical monitor device of the present disclosure comprises: In an optical monitoring device that detects the intensity of light propagating through multiple optical fibers, an optical component for branching a part of the incident light from the plurality of optical fibers in a first direction and the rest in a second direction at a constant branching ratio, and a light-receiving unit that receives light emitted from the optical component in a second direction; with The light receiving unit is having a light receiving surface large enough to receive all of the light emitted from the optical component in the second direction; More light receiving elements than the optical fibers are arranged two-dimensionally on the light receiving surface.
  • the light intensity measurement method of the present disclosure includes A light intensity measuring method for collectively measuring the intensity of light propagating through a plurality of optical fibers using the optical monitor device of the present disclosure, obtaining in advance the correspondence relationship between the plurality of optical fibers and each light receiving element by measuring the light receiving intensity at each light receiving element when each optical fiber is emitted from the plurality of optical fibers, Detecting the light intensity of each light receiving element received by the light receiving unit in a state where the plurality of optical fibers are propagating the light whose intensity is to be measured, Based on the correspondence relationship, for each of the plurality of optical fibers, (i) intensity of light received by the light receiving unit; (ii) light intensity of incident light incident from the plurality of incident-side optical fibers; (iii) the light intensity of the output light emitted to the plurality of output-side optical fibers; measure at least one of
  • an optical monitoring device for optical fibers with a large number of fibers, such as several tens of fibers, can be used. can be realized in a small size and at a low cost. Further, according to the present disclosure, highly accurate positioning of the light receiving element is not required.
  • FIG. 1 illustrates an example embodiment of an optical monitoring device of the present disclosure
  • An example of the arrangement of incident-side optical fibers is shown.
  • 4 shows an example of arrangement of light receiving elements in a light receiving section.
  • An example of light propagating through a spatial optical system is shown.
  • 1 illustrates an example embodiment of an optical monitoring device of the present disclosure
  • the optical monitor device of this embodiment has the configuration illustrated in FIG.
  • the optical monitoring device of this embodiment is an optical monitoring device that detects the intensity of light propagating through a plurality of incident-side optical fibers 11, For each incident light from the incident side optical fiber 11, most of the incident light is branched in a specific first direction and the rest is branched in another specific second direction at a constant branching ratio, and each branched light a spatial optical system 30 for emitting the a plurality of incident-side optical fibers 11 arranged in a two-dimensional array so that light is incident on the spatial optical system 30; a plurality of output-side optical fibers 12 arranged to receive most of the light 42 emitted from the spatial optical system 30; a light receiving unit 5 arranged to receive a part of the light 43 emitted from the spatial optical system 30; an incident-side optical lens 21 disposed between the spatial optical system 30 and the incident-side optical fiber 11 to convert each incident light from the incident-side optical fiber 11 to the spatial optical system 30 into parallel light; Output-
  • FIG. 1 shows an example in which the specific angle is 45 degrees and the direction of reflected light is 90 degrees
  • the direction of reflected light is not fixed at 90 degrees and can be changed as needed.
  • the spatial optical system 30 is not limited to a spatial system, and any optical component having a branching surface capable of branching into two light beams in different directions can be used.
  • light from the incident side optical fiber 11 becomes parallel light at the incident side optical lens 21, and loss due to diffusion is prevented. Furthermore, most of the light 42 is guided to the output side optical lens 22 by the spatial optical system 30 .
  • the exit-side optical lens 22 collects the light that has passed through the spatial optical system 30 and couples it to the exit-side optical fiber 12 . In this way, most of the light 42 emitted from the incident side optical fiber 11 can be guided to the emitting side optical fiber 12 with little loss.
  • part of the light 43 split by the spatial optical system 30 is guided to the light receiving section 5 arranged in a direction different from that of the majority of the light 42 .
  • the light receiving section 5 has a light receiving surface large enough to receive all the emitted light 43 from the spatial optical system 30 .
  • light-receiving elements larger in number than the incident-side optical fibers 11 are arranged two-dimensionally. Thereby, the intensity of part of the light propagating from the incident side optical fiber 11 to the emitting side optical fiber 12 can be measured.
  • FIG. 2 illustrates the arrangement of the incident-side optical fiber 11
  • FIG. 3 illustrates the arrangement of the light receiving elements on the light receiving surface of the light receiving section 5.
  • FIG. M incident-side optical fibers F1 to FM are arranged two-dimensionally at a constant pitch of four.
  • N light receiving elements M1 to MN are two-dimensionally arranged at a constant pitch.
  • the pitch of the incident side optical fibers F1 to FM does not match the pitch of the light receiving elements M1 to MN, and no special alignment is performed.
  • an image of the outgoing light 43 of the incident side optical fiber F1 is formed as shown in FIG. 3, for example.
  • the emitted light 43 is detected by the light receiving elements M2 to M5, M15 to M18, M28 to M31, and M41 to M44.
  • the light receiving unit 5 detects the sum of the light intensities detected by the light receiving elements M2 to M5, M15 to M18, M28 to M31, and M41 to M44 as the light intensity of the emitted light 43 from the incident side optical fiber F1.
  • the light intensity of each of the light receiving elements M1 to MN when the light of the reference intensity Pr is emitted from the incident side optical fiber F1 is measured in advance and recorded.
  • the correspondences Or 11 to Or 1N between the incident-side optical fiber F1 and the light receiving elements M1 to MN can be obtained.
  • the incident side optical fibers F2 to FM the corresponding relationships Or 21 to Or MN between the incident side optical fibers F2 to FM and the light receiving elements M1 to MN are recorded.
  • ij is the light intensity received by the j-th light-receiving element provided in the light-receiving unit 5 when the light is emitted from the i-th optical fiber among the incident-side optical fibers F1 to FM.
  • Equation 2 the light intensities O 1 to O N detected by the light receiving elements M1 to MN are Since it is the sum of the light incident from F1 to FM, it is represented by Equation 2.
  • Equation (3) the intensity of light incident on the light receiving section 5 from each of the optical fibers F1 to FM is expressed by Equation (3).
  • Equation 4 the intensity of the light incident from the incident side optical fiber 11 is given by Equation 4, and the intensity of the light propagated to the outgoing side optical fiber 12 is given by Equation 4. 5 can be estimated.
  • the light intensity measurement method of the present disclosure includes Acquire in advance the correspondence represented by Equation 1, While the incident-side optical fiber 11 is propagating the light whose intensity is to be measured, the light intensity is measured by the light receiving unit 5 using Equation 3, Measure the light intensity incident from the incident side optical fiber 11 using Equation 4, Using Equation 5, the intensity of light propagated to the output side optical fiber 12 is measured.
  • the light intensity of the light receiving unit 5 is measured by detecting the intensity of light received by each light receiving element when light is emitted from each incident side optical fiber 11 .
  • the correspondence relationship between the incident-side optical fiber 11 and each light receiving element is obtained in advance. Therefore, the intensity of light propagating through the incident-side optical fiber 11 can be collectively measured based on the correspondence relationship.
  • the spatial optical system 30 is provided between the entrance-side member 30A and the exit-side member 30B made of a material with a uniform refractive index.
  • Another single-layer film 33 having a uniform refractive index is provided, and the single-layer film 33 is provided at a specific angle (45 degrees in the figure) with respect to the optical axis of the incident light 41 .
  • the first refractive index interface 33A between the single layer film 33 and the entrance side member 30A and the second refractive index interface 33B between the single layer film 33 and the exit side member 30B are specified as the optical axis of the incident light. is set at an angle of
  • the lights 42B1 and 42B2 with different wavelengths travel in different directions in the single layer film 33. Therefore, the incident positions of the lights 42B1 and 42B2 with different wavelengths on the refractive index interface 33B are different.
  • light incident from the refractive index interface 33B travels in the same direction as the incident side member 30A due to refraction between the single layer film 33 and the emitting side member 30B. Therefore, even if the optical axes of the incident end surfaces of the output-side optical fibers 12 are arranged in parallel, the transmitted light can be coupled to the output-side optical fibers 12 regardless of the wavelength.
  • the single-layer film 33 causes a difference in the incident position to the refractive index interface 33B depending on the wavelength. Therefore, when the emitted lights 43B1 and 43B2 have different wavelengths, the emitted lights 43B1 and 43B2 have different reflection positions at the refractive index interface 33B. Therefore, in the present disclosure, the correspondence represented by Equation 1 may be obtained for each wavelength.
  • the position of the output-side optical lens 22 is determined according to the center wavelength and refraction angle of the incident light 41 and the thickness S of the single layer film 33 .
  • the width of the light reaching the output side optical lens 22 mainly depends on the wavelength width of the incident light 41 and the thickness S of the single layer film 33 . If the width of the light reaching the output-side optical lens 22 is small with respect to the diameter of the output-side optical lens 22, the light loss is small. Therefore, by setting the diameter of the exit-side optical lens 22 to a value equal to or larger than the value determined according to the wavelength width of the incident light 41 and the thickness S of the single-layer film 33, the optical loss can be reduced. On the other hand, if the diameter of the output-side optical lens 22 is greater than or equal to the installation interval of the incident-side fibers, it collides with the adjacent lens. .
  • the incident-side optical fiber 11 and the output-side optical fiber 12 are two-dimensionally arranged, and the spatial optical system 30 splits the two-dimensionally arranged light flux.
  • the size can be reduced more than using an optical monitoring device for each single fiber or an optical monitoring device in which optical fibers are arranged one-dimensionally.
  • the cost can be easily reduced because the number of constituent parts is small.
  • FIG. 5 shows a second example embodiment of the present disclosure.
  • the entrance side member 30A and the exit side member 30B can be made of a transparent material such as quartz glass.
  • the single-layer film 33 can utilize an air layer by arranging a spacer 34 having a uniform predetermined thickness between the incident-side member 30A and the emitting-side member 30B to form a gap.
  • the incident-side optical lens 21 and the output-side optical lens 22 can be realized by a collimator in which a GRIN (GRaded INdex) fiber is incorporated in a rectangular ferrule used in an optical connector or the like.
  • GRIN GRaded INdex
  • the incident-side optical fiber 11 and the output-side optical fiber 12 are also incorporated in the rectangular ferrules 23 and 24 similarly to the incident-side optical lens 21 and the output-side optical lens 22, and the guide pins 25 and the guide holes are used as in the optical connector.
  • the optical axes of the incident-side optical fiber 11, the incident-side optical lens 21, the exit-side optical fiber 12, and the exit-side optical lens 22 can be aligned.
  • the light receiving section 5 can be realized by a commercially available optical image sensor.
  • the single layer film 33 may be glass having a lower refractive index than the incident side member 30A and the output side member 30B.
  • the spatial optical system 30 is not limited to a cubic shape, and may have any shape such as a rectangular parallelepiped.
  • the light receiving section 5 can be arranged at any position where the light branched by the spatial optical system 30 can be received.
  • the light receiving section 5 may be embedded inside the spatial optical system 30 .
  • the optical monitoring device of the present disclosure can be used for monitoring any light transmitted in an optical transmission system.
  • the optical monitoring device of the present disclosure is installed in any device used in an optical transmission system, such as a transmitter, a receiver, or a relay device, and the measurement result at the light receiving unit 5 is measured at any part inside or outside the device.
  • the optical monitor device of the present disclosure can be inserted in the middle of a transmission line in an optical transmission system to measure the intensity and propagation loss of an optical signal in the transmission line.
  • This disclosure can be applied to the information and communications industry.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
PCT/JP2021/020452 2021-05-28 2021-05-28 光モニタデバイス及び光強度測定方法 Ceased WO2022249456A1 (ja)

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PCT/JP2021/020452 WO2022249456A1 (ja) 2021-05-28 2021-05-28 光モニタデバイス及び光強度測定方法
JP2023523915A JP7609268B2 (ja) 2021-05-28 2021-05-28 光モニタデバイス及び光強度測定方法

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62184404A (ja) * 1986-02-10 1987-08-12 Hitachi Ltd マトリクス型光合分波デバイス
US6873760B2 (en) * 2002-03-19 2005-03-29 Opti Work, Inc. Integrated optical fiber collimator
WO2007026510A1 (ja) * 2005-08-29 2007-03-08 Matsushita Electric Industrial Co., Ltd. ファイバレーザおよび光学装置
JP2007214189A (ja) * 2006-02-07 2007-08-23 Komatsu Ltd レーザチャンバのウィンドウ劣化判定装置および方法
JP2010050299A (ja) * 2008-08-22 2010-03-04 Gigaphoton Inc 偏光純度制御装置及びそれを備えたガスレーザ装置
US20100202048A1 (en) * 2007-04-22 2010-08-12 Yaakov Amitai Collimating optical device and system
JP2012533915A (ja) * 2009-06-26 2012-12-27 アルカテル−ルーセント 光横モード多重化信号のための受信機
WO2014049852A1 (ja) * 2012-09-28 2014-04-03 株式会社日立製作所 光ファイバと接続する光路変換光結合デバイスおよび光モジュール
CN104092493A (zh) * 2014-07-30 2014-10-08 四川飞阳科技有限公司 一种单向光功率监测器

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Publication number Priority date Publication date Assignee Title
US7050669B2 (en) * 2001-04-30 2006-05-23 Trex Enterprises Corp. Optical cross connect switch with axial alignment beam
JP5749578B2 (ja) * 2011-06-09 2015-07-15 株式会社エンプラス レンズアレイおよびこれを備えた光モジュール
CN208569113U (zh) * 2018-08-03 2019-03-01 武汉华工正源光子技术有限公司 一种带空气间隙的背光监控光组件及装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62184404A (ja) * 1986-02-10 1987-08-12 Hitachi Ltd マトリクス型光合分波デバイス
US6873760B2 (en) * 2002-03-19 2005-03-29 Opti Work, Inc. Integrated optical fiber collimator
WO2007026510A1 (ja) * 2005-08-29 2007-03-08 Matsushita Electric Industrial Co., Ltd. ファイバレーザおよび光学装置
JP2007214189A (ja) * 2006-02-07 2007-08-23 Komatsu Ltd レーザチャンバのウィンドウ劣化判定装置および方法
US20100202048A1 (en) * 2007-04-22 2010-08-12 Yaakov Amitai Collimating optical device and system
JP2010050299A (ja) * 2008-08-22 2010-03-04 Gigaphoton Inc 偏光純度制御装置及びそれを備えたガスレーザ装置
JP2012533915A (ja) * 2009-06-26 2012-12-27 アルカテル−ルーセント 光横モード多重化信号のための受信機
WO2014049852A1 (ja) * 2012-09-28 2014-04-03 株式会社日立製作所 光ファイバと接続する光路変換光結合デバイスおよび光モジュール
CN104092493A (zh) * 2014-07-30 2014-10-08 四川飞阳科技有限公司 一种单向光功率监测器

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