WO2023170862A1 - Procédé de spécification de position d'âme, procédé de connexion de fibre optique et dispositif de connexion de fibre optique - Google Patents

Procédé de spécification de position d'âme, procédé de connexion de fibre optique et dispositif de connexion de fibre optique Download PDF

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Publication number
WO2023170862A1
WO2023170862A1 PCT/JP2022/010585 JP2022010585W WO2023170862A1 WO 2023170862 A1 WO2023170862 A1 WO 2023170862A1 JP 2022010585 W JP2022010585 W JP 2022010585W WO 2023170862 A1 WO2023170862 A1 WO 2023170862A1
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WIPO (PCT)
Prior art keywords
core
optical fiber
core optical
optical fibers
interferometer
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Application number
PCT/JP2022/010585
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English (en)
Japanese (ja)
Inventor
一貴 納戸
卓威 植松
裕之 飯田
栄伸 廣田
研司 井上
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日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2022/010585 priority Critical patent/WO2023170862A1/fr
Publication of WO2023170862A1 publication Critical patent/WO2023170862A1/fr

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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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • 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
    • G02B6/255—Splicing of light guides, e.g. by fusion or bonding

Definitions

  • the present disclosure relates to a core position specifying method for specifying the position of each core at the end of a multi-core optical fiber, an optical fiber connecting method for connecting the ends of two multi-core optical fibers in which the position of each core has been specified, and an optical fiber.
  • connection devices Regarding connection devices.
  • Figure 1 shows the structure of an optical fiber.
  • the optical fiber is composed of a core glass 11 through which light propagates, a clad glass 12 that covers the core glass, and a coating 13 that protects the glass portion.
  • the diameter of the core glass 11 is 10 ⁇ m
  • the diameter of the cladding glass 12 is 125 ⁇ m
  • the diameter of the optical fiber including the coating is 250 ⁇ m.
  • the characteristics of an optical fiber can be changed by changing the refractive index difference and refractive index distribution between the core glass and cladding glass, but the structure consisting of the core and cladding glass is common to all optical fibers. .
  • FIG. 2 shows a cross-sectional view of the optical fiber glass.
  • FIG. 2(A) shows an optical fiber in which the center O of the clad glass 12 and the center Oc of the core glass 11 are offset, and there is eccentricity. Such optical fibers are not currently manufactured.
  • FIG. 1(B) shows that the centers of the clad glass 12 and the core glass 11 are aligned, and there is no eccentricity.
  • a single-core optical fiber has a core placed in the center of a clad glass.
  • FIG. 3 A method for connecting optical fibers without eccentricity is shown in FIG. 3 (see, for example, Non-Patent Document 1).
  • the fusion splicing technique uses image recognition technology and a micrometer in conjunction to align the ends of the two optical fibers 31 placed in the V-groove 30 with high precision. Thereafter, an arc discharge 33 is formed between the two electrode rods 32, and the end portions of the optical fibers 31 are melted and connected by the heat, thereby integrating the two.
  • optical fibers can be fusion spliced.
  • the reason why fusion splicing can be performed by aligning the optical fibers is that the core is located at the center of the optical fiber.
  • FIG. 4(A) shows the structure of a single-core optical fiber having one core
  • FIG. 4(B) shows the structure of a multi-core optical fiber having four cores, as examples.
  • FIG. 5 shows a cross-sectional view of the multi-core optical fiber shown in FIG. 4(B). Four pieces of core glass 11 are arranged in clad glass 12.
  • Non-Patent Document 1 In the optical fiber splicing method of Non-Patent Document 1, simply butting two multi-core optical fibers together causes the cores to be misaligned, and fusion splicing cannot be performed as is. This is because many core glasses 11 are arranged in the clad glass 12. Furthermore, current image recognition technology does not have the accuracy to identify the position of the core from outside the optical fiber. That is, there is a problem in that it is difficult to connect multi-core optical fibers using the method of connecting single-core optical fibers.
  • the present invention provides a method for specifying the core position of a multi-core optical fiber from the outside and enabling fusion splicing of the multi-core optical fibers, and an optical fiber connection method.
  • An object of the present invention is to provide a method and an optical fiber connection device.
  • the core position specifying method involves injecting test light from the side surface of an optical fiber and specifying the position of the core from the state of the reflected light reflected inside.
  • the core position identification method includes: Injecting the test light from the optical interferometer perpendicularly into the side of the multi-core optical fiber;
  • the present invention is characterized in that the reflected light of the test light reflected within the multi-core optical fiber is captured by the interferometer, and the position of the core in the cross section of the multi-core optical fiber is specified from the change in the intensity of the reflected light.
  • the interferometer is a swept wavelength optical coherence tomography (SS-OCT).
  • the present invention can provide a core position specifying method that can specify the position of the core of a multi-core optical fiber from the outside and enable fusion splicing of the multi-core optical fibers.
  • the optical fiber connection method includes: identifying the positions of the cores at the ends of the two multi-core optical fibers using the core position identifying method; The end portions of the two multi-core optical fibers are faced to each other so that the cores are aligned, and the end portions of the two multi-core optical fibers are connected.
  • the optical fiber connection method is as follows: specifying the position of the core at an end of one of the multi-core optical fibers using the core position specifying method; facing an end of the other multi-core optical fiber to an end of the multi-core optical fiber;
  • the core position specifying method according to claim 1 or 2, specifying the position of the core at the other end of the multi-core optical fiber;
  • the method may include rotating one of the multi-core optical fibers around an axis to align the cores at the opposing ends, and connecting the ends of the two multi-core optical fibers. .
  • the optical fiber connection method includes: By injecting the test light perpendicularly into the side surface of the multi-core optical fiber, by capturing the reflected light reflected by the test light within the multi-core optical fiber, and from the change in the intensity of the reflected light, the core in the cross section of the multi-core optical fiber is detected.
  • an interferometer for determining the position of the a holder that holds the two multi-core optical fibers with their respective ends facing each other; a rotation mechanism that rotates one of the multi-core optical fibers around an axis and aligns the cores at the opposing ends; an electrode rod that fusion-connects the ends of the two multi-core optical fibers; This can be realized with an optical fiber connection device equipped with
  • the present invention provides a core position identification method, an optical fiber connection method, and an optical fiber connection device that can identify the core position of a multicore optical fiber from the outside and enable fusion splicing of the multicore optical fibers. I can do it.
  • FIG. 2 is a diagram illustrating the structure of an optical fiber.
  • FIG. 2 is a diagram illustrating a cross-sectional structure of an optical fiber. It is a figure explaining the connection method of an optical fiber.
  • FIG. 2 is a diagram illustrating a single-core optical fiber and a multi-core optical fiber.
  • FIG. 2 is a diagram illustrating a cross-sectional structure of a multi-core optical fiber.
  • FIG. 3 is a diagram illustrating a core position specifying method according to the present invention.
  • FIG. 3 is a diagram illustrating an interferometer used in the core position specifying method according to the present invention.
  • FIG. 3 is a diagram illustrating an optical fiber connection method according to the present invention.
  • FIG. 1 is a diagram illustrating an optical fiber connection device according to the present invention.
  • FIG. 3 is a diagram illustrating an optical fiber connection method according to the present invention.
  • FIG. 1 is a diagram illustrating an optical fiber connection device according to the present invention.
  • FIGS. 6 and 7 are diagrams illustrating the core position specifying method of this embodiment.
  • This core location method is Injecting test light L T from the optical interferometer 70 perpendicularly into the side surface of the multi-core optical fiber 50 (step S01);
  • the position of the core in the cross section of the multi-core optical fiber 50 is determined by capturing the reflected light L R reflected by the test light L T in the multi-core optical fiber 50 with the interferometer 70 (step S02), and from the change in the intensity of the reflected light L R. Identifying (step S03) It is characterized by
  • the interferometer 70 is a swept wavelength optical coherence tomography (SS-OCT).
  • the interferometer 70 includes a wavelength swept light source 71, a beam splitter 72, a reference mirror 73, and a detector 74.
  • the interferometer 70 identifies the core position as follows.
  • the light from the light source 71 is split by a beam splitter 72, and one part is made into the optical fiber 50 to be measured as the test light LT , and the other part is made into the reference mirror 73 as the reference light LX .
  • the test light LT incident on the optical fiber 50 is reflected at the interface between the core and the cladding, which have different refractive indexes, and is emitted from the optical fiber 50 as reflected light LR .
  • the location where the reflected light LR is generated can be regarded as a location where there is a difference in refractive index, that is, the boundary between the core and the cladding.
  • the interferometer 70 identifies the location where the reflected light LR is generated in the following manner.
  • the reflected light L R reflected from the optical fiber 50 and the reference light L X reflected from the reference mirror 73 overlap again on the beam splitter 72 .
  • the reflected light L R and the reference light L X interfere with each other, and if the distance traveled through the optical fiber 50 and the distance traveled back and forth through the reference mirror 73 are equal, the interference frequency becomes 0. Therefore, by moving the reference mirror 73 and using the detector 74 to find the position where the frequency of the interference light between the reflected light L R and the reference light L It is possible to determine whether a core exists.
  • the interferometer 70 can thus identify the positions of a plurality of cores from the side of the optical fiber 50 by utilizing the difference in refraction between the core and the cladding.
  • the positions of the plurality of cores can be specified by changing the wavelength of the light source 71 without moving the reference mirror 73.
  • FIGS. 8 and 9 are diagrams for explaining the optical fiber connection method of this embodiment.
  • This optical fiber connection method is Identifying the positions of the plurality of cores at the ends 50a of the two multi-core optical fibers 50 using the core position identifying method described in Embodiment 1 (step S11); The ends 50a of the two multi-core optical fibers 50 are faced to each other so that the positions of their respective cores are aligned (step S12), and the ends 50a of the two multi-core optical fibers are connected (step S13). It is characterized by
  • step S11 a plurality of core positions at the end portions 50a of the two multi-core optical fibers 50 to be connected are specified using the method described in the first embodiment.
  • step S12 two multi-core optical fibers 50 are placed in the V-groove 30 with their ends 50a facing each other as shown in FIG.
  • the positions of a plurality of cores at the end portion 50a are known in both cases, the positions of the two cores are aligned so that they face each other.
  • step S13 the ends 50a of the two multi-core optical fibers 50 are fusion-spliced as described in FIG. 3.
  • FIGS. 10 and 11 are diagrams illustrating the optical fiber connection method of this embodiment.
  • This optical fiber connection method is Identifying the positions of the plurality of cores at the end 50a of one multi-core optical fiber 50-1 using the core position identifying method described in Embodiment 1 (step S21); facing the end 50a of the other multi-core optical fiber 50-2 to the end 50a of the multi-core optical fiber 50-1 (step S22); Identifying the positions of the plurality of cores at the end 50a of the multi-core optical fiber 50-2 using the core position identifying method described in Embodiment 1 (step S23); Rotating one of the multi-core optical fibers (50-1 or 50-2) around the axis and aligning the positions of the respective cores at the opposing ends 50a (step S24), and rotating the two multi-core optical fibers ( 50-1, 50-2) (step S25) It is characterized by
  • FIG. 11 is a diagram illustrating the optical fiber connection device of this embodiment.
  • This optical fiber connection device is By making the test light L T perpendicularly incident on the side surface of the multi-core optical fiber 50, by capturing the reflected light L R reflected by the test light L T within the multi-core optical fiber 50, and by changing the intensity of the reflected light L R , the multi-core an interferometer 70 that specifies the positions of the plurality of cores in the cross section of the optical fiber 50; a holder (V groove 30) that holds two multi-core optical fibers (50-1, 50-2) with their respective ends 50a facing each other; a rotation mechanism 80 that rotates one of the multi-core optical fibers (in this embodiment, the multi-core optical fiber 50-2) around an axis and aligns the positions of the respective cores at the opposing ends 50a; an electrode rod 32 that fusion-connects the ends 50a of two multi-core optical fibers (50-1, 50-2); Equipped with
  • the position of each core of two multi-core optical fibers can be specified. However, in many cases, simply butting the ends of two multicore optical fibers together will result in the cores being misaligned, so it is necessary to align the core positions.
  • the test light LT is incident on the surface of the multi-core optical fiber 50-2 using the interferometer 70, thereby positioning the multiple cores in real time.
  • Fusion splicing is performed when the core position of multi-core optical fiber 50-2 matches the core position of multi-core optical fiber 50-1, which has been arranged with the core position known in advance.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Le but de la présente invention est de fournir un procédé de spécification de position d'âme, un procédé de connexion de fibre optique et un dispositif de connexion de fibre optique, capables de spécifier de manière externe la position d'une âme d'une fibre optique à âmes multiples et permettant un épissage par fusion entre des fibres optiques à âmes multiples.　Le procédé de spécification de position d'âme selon la présente invention est caractérisé en ce qu'il amène une lumière de test LT provenant d'un interféromètre optique 70 à entrer dans une surface latérale d'une fibre optique à âmes multiples 50 à un angle droit (étape S01) ; capturer la lumière réfléchie LR, qui est la lumière de test LT réfléchie à l'intérieur de la fibre optique à âmes multiples 50, avec l'interféromètre optique 70 (étape S02) ; et spécifier la position d'une âme sur une section transversale de la fibre optique à âmes multiples 50 sur la base d'un changement d'intensité de la lumière réfléchie LR (étape S03).
PCT/JP2022/010585 2022-03-10 2022-03-10 Procédé de spécification de position d'âme, procédé de connexion de fibre optique et dispositif de connexion de fibre optique WO2023170862A1 (fr)

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PCT/JP2022/010585 WO2023170862A1 (fr) 2022-03-10 2022-03-10 Procédé de spécification de position d'âme, procédé de connexion de fibre optique et dispositif de connexion de fibre optique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009244082A (ja) * 2008-03-31 2009-10-22 Fujifilm Corp 光源および光断層画像化装置
KR20110005022A (ko) * 2009-07-09 2011-01-17 한국과학기술연구원 광섬유 타원율 측정 장치 및 방법
US20140376000A1 (en) * 2013-06-23 2014-12-25 Acacia Communications Inc. Integrated optical coherence tomography systems and methods
WO2017130627A1 (fr) * 2016-01-25 2017-08-03 日本電信電話株式会社 Dispositif d'alignement et procédé d'alignement
JP2018515799A (ja) * 2015-03-27 2018-06-14 インテュイティブ サージカル オペレーションズ， インコーポレイテッド 接続されるべきマルチコア光ファイバの干渉法整列

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009244082A (ja) * 2008-03-31 2009-10-22 Fujifilm Corp 光源および光断層画像化装置
KR20110005022A (ko) * 2009-07-09 2011-01-17 한국과학기술연구원 광섬유 타원율 측정 장치 및 방법
US20140376000A1 (en) * 2013-06-23 2014-12-25 Acacia Communications Inc. Integrated optical coherence tomography systems and methods
JP2018515799A (ja) * 2015-03-27 2018-06-14 インテュイティブ サージカル オペレーションズ， インコーポレイテッド 接続されるべきマルチコア光ファイバの干渉法整列
WO2017130627A1 (fr) * 2016-01-25 2017-08-03 日本電信電話株式会社 Dispositif d'alignement et procédé d'alignement

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