WO2022009286A1 - 光ファイバ及びその接続方法 - Google Patents

光ファイバ及びその接続方法 Download PDF

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Publication number
WO2022009286A1
WO2022009286A1 PCT/JP2020/026481 JP2020026481W WO2022009286A1 WO 2022009286 A1 WO2022009286 A1 WO 2022009286A1 JP 2020026481 W JP2020026481 W JP 2020026481W WO 2022009286 A1 WO2022009286 A1 WO 2022009286A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
core
clad
clad portion
optical
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/JP2020/026481
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
栄伸 廣田
卓威 植松
裕之 飯田
崇 海老根
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 US18/013,113 priority Critical patent/US20230296828A1/en
Priority to PCT/JP2020/026481 priority patent/WO2022009286A1/ja
Priority to JP2022534514A priority patent/JP7405259B2/ja
Publication of WO2022009286A1 publication Critical patent/WO2022009286A1/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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
    • 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
    • G02B6/245—Removing protective coverings of light guides before coupling
    • 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
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals

Definitions

  • devices 91-1 and 91-2 are installed at both ends of the optical fiber 92.
  • An optical signal is output from the device, and optical communication is performed by recognizing each other's devices via the optical fiber 92.
  • the optical fiber 92-1 is cut (FIG. 3B), and a bifurcated splitter 93 capable of separating signals is attached (FIG. 3C).
  • FIG. 3A optical signals are output from the devices 91-1 and 91-2 to maintain communication.
  • the optical signals output from the devices 91-1 and 91-2 are stopped.
  • an optical signal can be transmitted and received from each device for the first time (FIG. 3D).
  • the optical fiber must be cut in order to attach a new device (applicable to device 91-3 in FIG. 3). Cutting the optical fiber means stopping the communication between the device 91-1 and the device 91-2, so that the service cannot be provided to the user.
  • FIG. 4 is a wiring mode for providing a service.
  • An optical subscriber line termination device (Optical Line Thermal: OLT) 82 is installed in the communication building, and an optical subscriber line network device (Optical Network Unit: ONU) 81 is installed in the user's home.
  • the OLT82 and ONU81 correspond to the device 91-1 and the device 91-2.
  • an integrated wiring rack (Integrated Distribution Module: IDM) 83 is used in the communication building, and an optical fiber cable 84 and an 8-branch splitter 85 are used outside the communication building.
  • IDM Integrated Distribution Module
  • FIG. 4 shows an example in which one ONU 81 is wired, that is, only one user is wired, but a plurality of ONU 81s can be connected to one OLT 82.
  • the position where the 8-branch splitter 85 is placed is determined based on the place where the user has applied and the forecast of the demand that the user will apply for.
  • the 8-branch splitter 85 can accommodate up to 8 users, but in such a scheme, all 8 users are rarely used. If it is not used, it will be useless.
  • the optical signal propagating through the core of the optical fiber can be taken out of the optical fiber anytime, anywhere without interrupting communication without using a splitter, or can be put into the core from the outside of the optical fiber. ing.
  • Patent Document 1 Non-Patent Document 1
  • This is a form in which an optical fiber is bent and an optical fiber probe is placed in the vicinity of the bent portion.
  • This is the principle that an optical signal is coupled between a bent portion of an optical fiber and a probe. That is, the optical communication propagating through the core of the optical fiber leaks from the bent portion due to the bending of the optical fiber, and the leaked light is received by the probe fiber. Further, the optical signal output from the tip of the probe fiber is coupled to the core of the bent optical fiber. Therefore, the input and output of the optical signal can be simultaneously established between the bent fiber and the probe.
  • the optical fiber has innumerable cracks on the glass surface during manufacturing.
  • the crack grows and the optical fiber itself breaks (Non-Patent Document 2). Therefore, the method of bending an optical fiber is limited to tests and operations that can be performed in a short time.
  • an object of the present disclosure is to enable input / output of an optical signal propagating in the core of an optical fiber without bending the optical fiber.
  • the optical fiber of the present disclosure includes a structure in which a part of the clad layer is replaced with a core glass and a resin material that can be peeled from the clad glass in the optical fiber having a core and a clad layer. Further, in the optical fiber connection method of the present disclosure, the optical fibers are connected by bringing the cores of the two optical fibers from which the resin material is peeled off into contact with each other.
  • the optical fiber of the present disclosure is With the core A clad layer having a lower refractive index than the core, A coating layer that covers the outer periphery of the clad layer and Equipped with The clad layer is The first clad portion whose main component is the same as that of the core, The second clad portion, which has a different main component from the first clad portion and is softer than the first clad portion, Equipped with The boundary surface between the first clad portion and the second clad portion is in contact with the core.
  • optical fiber connection method of the present disclosure is described. A part of the coating layer in the longitudinal direction of the two optical fibers according to the present disclosure is removed. The second clad portion of the two optical fibers was removed from the removed coating layer to expose the core. The cores of the two exposed optical fibers are brought into contact with each other.
  • An example of an optical fiber after removing the second clad portion is shown. It is explanatory drawing which shows an example of the output method of the optical signal using the optical fiber of this disclosure. It is explanatory drawing which shows an example of the input method of the optical signal using the optical fiber of this disclosure.
  • An example of an optical fiber after removing the second clad portion is shown.
  • An example of an optical fiber after removing the second clad portion is shown.
  • An example of a state in which an optical fiber is connected is shown. It is sectional drawing which shows the structural example of the optical fiber which concerns on this disclosure.
  • the clad layer 12 of the present invention includes two clad portions 12A and 12B made of different materials.
  • the main component of the first clad portion 12A is the same glass material as the core 11, and the main component of the other clad portion 12B is a material other than the glass material.
  • Examples of the material other than the glass contained in the clad portion 12B include a polymer resin and an acrylic resin, and any material having a predetermined refractive index can be applied.
  • the clad portion 12A may be referred to as a first clad portion or a glass clad portion
  • the clad portion 12B may be referred to as a second clad portion.
  • the optical fiber of the present disclosure can be manufactured by using a known drawing technique.
  • the drawing technology is to melt the glass by placing the glass rod, which is the base material of the optical fiber, in a high temperature environment of 1000 ° C or higher, and to make it thinner by pulling it.
  • the base material for forming the core 11 and the glass clad 12A is thinned by using a drawing technique.
  • the boundary surface 14 is formed on the clad layer of the optical fiber wire coming out of the wire drawing device.
  • the boundary surface 14 is a surface having an arbitrary shape capable of exposing at least a part of the core 11, for example, a flat surface.
  • FIG. 8 shows a method of extracting an optical signal.
  • optical fibers 10 and 20 are used.
  • the optical fibers 10 and 20 have the same configuration as the optical fiber 10 shown in FIG.
  • the lower optical fiber 10 is the same as in FIG. 7B, and the boundary surface 14 is formed.
  • an optical fiber 20 is prepared which is composed of the same core 21 and glass clad 22A as the core 11 and glass clad 12A of FIG. 7B and whose boundary surface 24 is exposed.
  • an optical signal leaks from the polished core 11 to the core 21 side of the optical fiber 20 attached.
  • the arrows in the drawing indicate that the optical signal is transferred from the core 11 to the core 21 side. Therefore, the optical signal propagating through the core 11 of the optical fiber can be taken out to the core 21.
  • the optical fiber 10 of the present embodiment shows an example in which the boundary surface 14 has a U-shape, but any concave shape such as a V-shape or a U-shape can be adopted. Further, also in the optical fiber 20 of the present embodiment, an example in which the boundary surface 24 has a U-shape is shown, but any convex shape such as a V-shape or a U-shape can be adopted.
  • the bottom surface 141 in contact with the core 11 and the bottom surface 241 in contact with the core 21 have a flat surface that is in contact with the outer circumference of the core, and only one point on the outer circumference of the core is exposed in a cross-sectional view. It is configured.
  • the surface of the boundary surface in contact with the outer periphery of the core any shape that can expose the core 11 can be adopted.
  • the boundary surface 14 may be such that a quarter region of the outer periphery of the core 11 as shown in FIG. 15 is exposed.
  • the area in contact between the core 11 and the second clad portion 12B increases, the loss of the optical signal propagating in the core 11 increases, so that the core 11 exposed by the boundary surface 14 is preferably less than half of the outer circumference. ..
  • the covering layer 13 may include a covering layer 13A covering the first clad portion 12A and a covering layer 13B covering the second clad portion 12B.
  • the colors and patterns of the coating layers 13A and 13B are different so that the first clad portion 12A and the second clad portion 12B can be identified.
  • the optical fiber of the present disclosure can easily expose the core, and when a user who wants to use the service appears, the coating and the clad can be scraped off, and the optical fiber can be easily connected. Furthermore, until now, an 8-branch splitter has been used, and some of the 8-branch splitters have not been used. The present invention also eliminates the need for a conventional 8-branch splitter.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Optical Couplings Of Light Guides (AREA)
PCT/JP2020/026481 2020-07-06 2020-07-06 光ファイバ及びその接続方法 Ceased WO2022009286A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US18/013,113 US20230296828A1 (en) 2020-07-06 2020-07-06 Optical fiber and its connection method
PCT/JP2020/026481 WO2022009286A1 (ja) 2020-07-06 2020-07-06 光ファイバ及びその接続方法
JP2022534514A JP7405259B2 (ja) 2020-07-06 2020-07-06 光ファイバ及びその接続方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/026481 WO2022009286A1 (ja) 2020-07-06 2020-07-06 光ファイバ及びその接続方法

Publications (1)

Publication Number Publication Date
WO2022009286A1 true WO2022009286A1 (ja) 2022-01-13

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JP (1) JP7405259B2 (enExample)
WO (1) WO2022009286A1 (enExample)

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Citations (2)

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US20190235171A1 (en) * 2018-01-31 2019-08-01 Corning Optical Communications LLC Optical couplers for evanescent coupling of polymer clad fibers to optical waveguides using alignment features

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JP7405259B2 (ja) 2023-12-26
US20230296828A1 (en) 2023-09-21
JPWO2022009286A1 (enExample) 2022-01-13

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