WO2024075226A1 - バンドル光ファイバ - Google Patents

バンドル光ファイバ Download PDF

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Publication number
WO2024075226A1
WO2024075226A1 PCT/JP2022/037319 JP2022037319W WO2024075226A1 WO 2024075226 A1 WO2024075226 A1 WO 2024075226A1 JP 2022037319 W JP2022037319 W JP 2022037319W WO 2024075226 A1 WO2024075226 A1 WO 2024075226A1
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WO
WIPO (PCT)
Prior art keywords
optical fiber
core
bundle
optical
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/037319
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English (en)
French (fr)
Japanese (ja)
Inventor
和秀 中島
千里 深井
隆 松井
悠途 寒河江
勝久 田口
亜弥子 岩城
誉人 桐原
聖 成川
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 JP2024555538A priority Critical patent/JPWO2024075226A1/ja
Priority to US19/116,025 priority patent/US20260098998A1/en
Priority to PCT/JP2022/037319 priority patent/WO2024075226A1/ja
Publication of WO2024075226A1 publication Critical patent/WO2024075226A1/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
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4202—Packages, e.g. shape, construction, internal or external details for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles

Definitions

  • This disclosure relates to an optical fiber bundle that bundles multiple optical fibers, and an optical transmission system and an optical communication system that include the optical fiber bundle.
  • Non-Patent Document 1 discloses virus inactivation using an LED light source that removes wavelengths harmful to the human body
  • Non-Patent Document 2 discloses a cleaning technology using an excimer lamp.
  • Visible light is used in applications such as artificial light sources in plant factories, communication, image propagation, etc.
  • Non-Patent Document 3 discloses a plant factory using light sources in various visible wavelength bands. Infrared light is widely used in optical communications in general.
  • Lamps and LEDs are generally used as ultraviolet and visible light sources. Lamps and LEDs have a wide irradiation area and are suitable for irradiating a relatively wide area with a single light source. However, there are issues with these light sources, such as the difficulty in installing them in certain environments and in irradiating narrow areas.
  • Non-Patent Document 4 image fibers in which multiple optical fibers are bundled are widely used, such as in endoscopes (see, for example, Non-Patent Document 4).
  • endoscopes see, for example, Non-Patent Document 4
  • a bundle optical fiber in which ultraviolet optical fibers or visible optical fibers are bundled as disclosed in Non-Patent Document 5 it is possible to improve the coupling efficiency from LEDs or lamps to optical fibers in the relevant wavelength region.
  • Bundled optical fibers are made by fabricating a single-core optical fiber having a core and cladding, and bundling multiple such single-core optical fibers.
  • it is necessary to prepare a glass material that forms the core and cladding, and to fabricate a base material for forming the optical fiber. This creates problems such as a complicated manufacturing process and increased costs.
  • Non-Patent Document 6 discloses multi-core optical fiber technology that has multiple cores that can operate independently within a single optical fiber
  • Non-Patent Document 7 discloses optical fiber technology that propagates different optical signals (multi-modes) equal to the number of cores by controlling the lightwave coupling between adjacent cores.
  • optical fibers disclosed in these publications are manufactured by, for example, drilling holes in a single glass preform, inserting multiple core materials into the holes, and integrating them to create an optical fiber preform.
  • general multi-core optical fibers for optical communications in the infrared region have the problem of requiring a complex manufacturing process.
  • the present invention aims to provide a bundle optical fiber that can be manufactured in a simple process, which increases the coupling efficiency of light from a light source and enables space division multiplexing transmission.
  • a resin having a lower refractive index than the core such as an ultraviolet-curable resin, is adhered to the core made from a single glass base material, so that a single-core optical fiber can be more easily produced and bundled.
  • the present invention relates to an optical fiber bundle in which a plurality of single-core resin-clad optical fibers, each having a glass core covered with a resin clad having a refractive index smaller than that of the glass core, are bundled together.
  • the clad of the single-core resin clad optical fiber is made of resin. Therefore, only the glass core needs to be drawn from a base material of a single material, and a base material including the clad and the core is not required, so that the single-core resin clad optical fiber can be manufactured by a simple process.
  • the coupling efficiency of the light from the light source can be improved by bundling the single-core resin clad optical fibers up to about the spot size of the light source.
  • by adjusting the thickness of the resin clad it is possible to make a coupled multi-core optical fiber or an uncoupled multi-core optical fiber.
  • the present invention can provide a bundle optical fiber that can be manufactured in a simple process, which increases the coupling efficiency of light from a light source and enables space division multiplexing transmission.
  • the bundle optical fiber according to the present invention is characterized in that it comprises an outer jacket filled between the single-core resin clad optical fibers, covering the plurality of single-core resin clad optical fibers, and making the cross-sectional diameter a desired value.
  • the refractive index N1 of the glass core, the refractive index N2 of the resin cladding, and the refractive index N3 of the jacket satisfy the relationship N2 ⁇ N3 ⁇ N1.
  • the optical transmission system comprises the above-mentioned bundle optical fiber, a light source that inputs light to one end of the optical fiber bundle; Equipped with The irradiation area of light from the light source at one end of the bundle optical fiber is characterized in that it includes all of the glass cores appearing at one end of the bundle optical fiber, or is inside a circle inscribed around all of the glass cores at the outermost periphery among the glass cores appearing at one end of the bundle optical fiber. Since the light from the light source can be efficiently irradiated onto each glass core, the coupling efficiency of the light from the light source can be improved.
  • the optical transmission system comprises the above-mentioned bundle optical fiber, a plurality of light sources for injecting light into each of the glass cores appearing at one end of the bundle optical fiber; A different optical signal may be transmitted for each of the glass cores, thereby performing space division multiplexing optical transmission using one of the bundle optical fibers.
  • the optical communication system according to the present invention includes the bundle optical fiber as an uncoupled multi-core optical fiber or a coupled multi-core optical fiber. This optical communication system enables space division multiplexing transmission.
  • the present invention provides a bundle optical fiber that can be manufactured in a simple process, improving the coupling efficiency of light from a light source and enabling space division multiplexing transmission.
  • 1A to 1C are diagrams illustrating a conventional method for manufacturing an optical fiber bundle.
  • 1A to 1C are diagrams illustrating a method for manufacturing an optical fiber bundle according to the present invention.
  • 1 is a diagram illustrating an optical transmission system according to the present invention;
  • 1 is a diagram illustrating an optical fiber bundle according to the present invention;
  • 1 is a diagram illustrating a single-core resin-clad optical fiber constituting an optical fiber bundle according to the present invention;
  • 1 is a diagram illustrating an optical fiber bundle according to the present invention;
  • 1 is a diagram illustrating an optical fiber bundle according to the present invention;
  • 1 is a diagram illustrating an optical fiber bundle according to the present invention;
  • 1 is a diagram illustrating a single-core resin-clad optical fiber constituting an optical fiber bundle according to the present invention;
  • 1 is a diagram illustrating an optical fiber bundle according to the present invention;
  • the bundle optical fiber 301 is a bundle of a plurality of single-core resin-clad optical fibers 30, each of which has a glass core 11 and a resin clad 15 covering the outer periphery of the glass core 11, the resin clad 15 having a refractive index smaller than that of the glass core 11.
  • Figure 1 is a manufacturing process diagram explaining a conventional bundle optical fiber 300, which serves as a comparative example. It is necessary to prepare a base material 10 in which a core glass 11 is covered with a cladding glass 12 (Figure 1(A)). This base material 10 is heated and drawn, and a coating material 13 is applied to the outer periphery of the cladding glass 12 to produce a single-core optical fiber 20 ( Figure 1(B)). Then, several of these optical fibers 20 are bundled together to produce a bundle optical fiber 300 ( Figure 1(C)).
  • the base material 10 as shown in Fig. 1(A) is not necessary. Only the core glass 11 is heated and drawn (Fig. 2(A)), and a resin clad 15 is applied to the outer circumference of the drawn core glass 11 to produce a single-core resin clad optical fiber 30 (Fig. 2(B)). Then, multiple single-core resin clad optical fibers 30 are bundled together to produce the bundle optical fiber 301 (Fig. 2(C)).
  • the bundle optical fiber 301 does not require the preparation of a base material 10, and can be produced through a simple process of applying a resin cladding 15 to the core glass 11 after drawing.
  • (Embodiment 2) 3 is a diagram illustrating an optical transmission system 401 that transmits light 51 (infrared light, visible light, ultraviolet light, etc.) from a light source 50 to a long distance using a bundle optical fiber 301.
  • the light source 50 is, for example, a lamp, an LED light source, a single mode LD, or a multimode LD.
  • the optical transmission system 401 comprises a bundle optical fiber 301 and a light source 50 that inputs light 51 to one end T1 of the bundle optical fiber 301, and is characterized in that all or most of the glass core 11 appearing at one end T1 of the bundle optical fiber 301 is included within the irradiation area of the light 51 from the light source 50 at one end T1 of the bundle optical fiber 301.
  • Figure 3 (B) is a diagram explaining the former case in which the irradiation area 51a of the light 51 from the light source 50 at one end T1 of the bundle optical fiber 301 includes all of the glass cores 11 appearing at one end T1 of the bundle optical fiber 301.
  • Fig. 3(C) is a diagram for explaining the latter case in which most of the glass cores 11 appearing at one end T1 of the bundle optical fiber 301 are included in the irradiation area 51a of the light 51. That is, Fig.
  • 3(C) is a diagram for explaining the case in which the irradiation area 51a of the light 51 from the light source 50 at one end T1 of the bundle optical fiber 301 is inside a circle C1 inscribed with all the glass cores 11 at the outermost periphery among the glass cores 11 appearing at one end T1 of the bundle optical fiber 301.
  • the phrase "almost entirely included” refers to a state in which the bundle surface is larger than the irradiation area 51a, and the light 51 is not incident on some of the glass cores 11, or only a part of the light 51 is incident on the glass cores 11.
  • the NA of the single-core resin clad optical fiber 30 is relatively large.
  • Figure 4 is a view of one end T1 of the bundle optical fiber 301 as viewed from the axial direction of the bundle optical fiber 301.
  • the NA of the single-core resin clad optical fiber 30 is set to 0.22, and the core radius is set to 100 ⁇ m.
  • the thickness of the resin clad 15 may be approximately several tens of ⁇ m or more, and in this example, is set to 10 ⁇ m as an example.
  • the core radius can be set to any value, but if the core radius is too large, the rigidity of the glass increases and flexibility is lost, so it is preferably approximately 150 ⁇ m or less.
  • the light source 50 is an LED in the ultraviolet wavelength range, in which the spot diameter of the light 51 at one end T1 of the bundle optical fiber 301 is approximately 1.5 mm.
  • 37 single-core resin clad optical fibers 30, each having an outer diameter of the resin clad 15 of 220 ⁇ m, are bundled in a hexagonal close-packed configuration. This allows the maximum diameter after bundling to be set to approximately 1.5 mm.
  • the cross-sectional shape of the bundle optical fiber 301 is similar to the light emitting surface of the light source 50, as described in this example.
  • the light intensity measured directly at the emission end of the LED, which is the light source 50, using a light receiving element with a light receiving surface larger than the LED light emitting surface was approximately 1.7 mW.
  • light from the LED was propagated 1 m through a conventional single-core glass clad optical fiber (one piece).
  • the light intensity of the light emitted from that optical fiber, measured using a light receiving element was approximately 17 ⁇ W. Therefore, the coupling efficiency for this optical fiber is approximately 1%.
  • light from the LED was propagated 1 m through the bundle optical fiber 301, and the light intensity of the emitted light, measured using a light receiving element, was approximately 1.7 mW. In this way, it was found that by bundling optical fibers, a coupling efficiency of almost 100% can be obtained.
  • the light from the light source spreads to a certain extent, if there is only one optical fiber as in the comparative example, most of the light cannot be coupled to the core glass of the optical fiber.
  • by bundling multiple optical fibers up to about the diameter of the spread light as in this embodiment it becomes possible to receive light that could not be received by a single optical fiber, and the coupling efficiency increases.
  • the optical communication system of this embodiment includes:
  • the optical fiber bundle 301 includes a bundle optical fiber 301 and a plurality of light sources that input light to each of the glass cores 11 appearing at one end T1 of the bundle optical fiber 301, and is characterized in that a different optical signal is transmitted for each glass core 11, and space division multiplexing optical transmission is performed using a single bundle optical fiber 301.
  • the bundle optical fiber 301 is used as an uncoupled multi-core optical fiber.
  • a single-mode single-core optical fiber is used in a large-capacity optical communication system utilizing an infrared wavelength region.
  • an uncoupled multi-core optical fiber in which single-mode single-core resin-clad optical fibers 30 are bundled will be described.
  • the single-core resin clad optical fiber 30 of this embodiment has a core glass 11 made of pure silica glass with a diameter of approximately 9 ⁇ m, and the relative refractive index difference between the resin clad 15 and the core glass 11 is set to approximately 0.35%.
  • the distance between adjacent cores when bundled must be sufficiently large. It is generally known that a distance of about 40 ⁇ m between adjacent cores can sufficiently reduce crosstalk due to optical coupling between cores (see, for example, Non-Patent Document 8).
  • the thickness of the resin cladding 15 is set to about 15.5 ⁇ m, and the minimum distance between adjacent cores (the center-to-center distance of the core glass 11) is set to 40 ⁇ m or more (see Figures 5 and 6).
  • seven single-core resin-clad optical fibers 30 are bundled in a hexagonal close-packed manner to realize a seven-core uncoupled multi-core optical fiber.
  • the number and shape of the optical fibers to be bundled can be set as desired.
  • the bundled optical fibers can be handled as a single unit by covering the entire bundled optical fibers with the outer resin coating 17. That is, the bundle optical fiber 301 of this embodiment is characterized by having an outer coating (outer resin coating 17) that is filled between the single-core resin clad optical fibers 30, covers the single-core resin clad optical fibers 30, and sets the cross-sectional diameter to a desired value.
  • the outer resin coating 17 is, for example, an index matching gel or an ultraviolet curable resin.
  • the refractive index N3 of the outer resin coating 17 be equal to or greater than the refractive index N2 of the resin cladding 15 and less than the refractive index N1 of the core glass 11.
  • the uncoupled multi-core optical fiber (bundle optical fiber 301) of this embodiment also has a similar diameter, which is preferable because it allows the use of existing optical connector technology or optical cable technology.
  • single-core resin clad optical fibers 30 with a diameter of about 40 ⁇ m are bundled in a square lattice shape, and while the whole is bundled in a spiral shape, the outer resin coating 17 is set so that the minimum thickness in the diagonal optical fiber direction is about 14.2 ⁇ m.
  • the bundle optical fiber 301 in FIG. 7 can be used as a 4-core uncoupled multi-core optical fiber with an outer diameter of 125 ⁇ m.
  • the optical communication system of this embodiment includes:
  • the optical fiber bundle 301 includes a bundle optical fiber 301 and a plurality of light sources that input light to each of the glass cores 11 appearing at one end T1 of the bundle optical fiber 301, and is characterized in that a different optical signal is transmitted for each glass core 11, and space division multiplexing optical transmission is performed using a single bundle optical fiber 301.
  • the bundle optical fiber 301 is used as a coupled-type multi-core optical fiber.
  • a single-mode single-core optical fiber is used in a large-capacity optical communication system utilizing an infrared wavelength region.
  • a coupled-type multi-core optical fiber in which single-mode single-core resin-clad optical fibers 30 are bundled will be described.
  • the diameter of the core glass 11 is set to about 9 ⁇ m and made of pure silica glass, and the relative refractive index difference between the resin clad 15 and the core glass 11 is set to about 0.35%, in order to achieve good single-mode operation in the communication wavelength band of 1260 to 1625 nm.
  • Non-Patent Document 7 discloses that good 12-mode propagation can be achieved by arranging 12 cores in a square lattice with a core spacing of 16.4 ⁇ m.
  • a germanium-doped core glass 11 having a diameter of about 9 ⁇ m was covered with a resin clad 15 having a thickness of about 4 ⁇ m to produce a single-core resin clad optical fiber 30 having a diameter of about 17 ⁇ m.
  • 12 of the single-core resin clad optical fibers 30 were bundled in a square lattice shape to produce a 12-core coupled multi-core optical fiber (bundle optical fiber 301).
  • the outer resin coating 17 is set so that the minimum thickness in the radial direction of the bundle optical fiber 301 is about 10.5 ⁇ m.
  • the refractive index N3 of the outer resin coating 17 can be set arbitrarily, but it is preferable to set it to be equal to the refractive index N2 of the resin clad 15, since this allows stable inter-core coupling to be maintained in the longitudinal direction.
  • Refractive index of core glass 11 N1
  • Refractive index of resin clad 15 N2
  • the optical fiber bundle 301 described in this embodiment has the following advantageous effects.
  • (Advantage 1) Simplified Manufacturing Process When manufacturing an optical fiber, since it is not necessary to construct the cladding from a glass material, the optical fiber preform can be made from a single glass material having a uniform refractive index.
  • (Advantage 2) Simplified Manufacturing Process By bundling the individual single-core resin-clad optical fibers 30, a multi-core optical fiber can be manufactured without carrying out the above-mentioned special preform processing.
  • Advantage 3 Space division multiplexing transmission is possible with suppressed light wave coupling between cores.
  • the amount of light wave coupling between adjacent optical fibers (cores) when bundled can be suppressed by suppressing the amount of light propagating light that leaks out of the cladding region in each optical fiber.
  • the amount of light wave coupling between adjacent optical fibers can be controlled, making it possible to achieve high-capacity optical communication transmission as space division multiplexing transmission using a coupled multicore fiber.
  • Optical fiber 30 Single-core resin clad optical fiber 50: Light source 51: Light 51a: Irradiation area 300, 301: Bundle optical fiber 401: Optical transmission system

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
PCT/JP2022/037319 2022-10-05 2022-10-05 バンドル光ファイバ Ceased WO2024075226A1 (ja)

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JP2024555538A JPWO2024075226A1 (https=) 2022-10-05 2022-10-05
US19/116,025 US20260098998A1 (en) 2022-10-05 2022-10-05 Bundled optical fiber
PCT/JP2022/037319 WO2024075226A1 (ja) 2022-10-05 2022-10-05 バンドル光ファイバ

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797504A (en) * 1980-12-10 1982-06-17 Furukawa Electric Co Ltd:The Forming method for end part of light guide
JPH03229204A (ja) * 1990-02-05 1991-10-11 Sumitomo Electric Ind Ltd プラスチッククラッド光ファイバシート
JP2003121662A (ja) * 2001-10-09 2003-04-23 Totoku Electric Co Ltd ライトガイドバンドルおよびその製造方法
JP2003322730A (ja) * 2002-04-30 2003-11-14 Sumitomo Electric Ind Ltd バンドルファイバ、これを用いた光源装置およびその製造方法
JP2013254144A (ja) * 2012-06-08 2013-12-19 Ushio Inc 貼り合わせ方法
JP2014106253A (ja) * 2012-11-22 2014-06-09 Fujikura Ltd バンドル型マルチコアファイバ
US20150055915A1 (en) * 2013-08-23 2015-02-26 Corning Incorporated Light-coupling apparatus and methods for light-diffusing optical fibers
JP2016148709A (ja) * 2015-02-10 2016-08-18 住友電気工業株式会社 光ファイバユニットおよび光ケーブル
JP2018506027A (ja) * 2014-12-23 2018-03-01 ゾロ テクノロジーズ，インコーポレイティド 広間隔波長のためのｔｄｌａｓ構造
JP2018130367A (ja) * 2017-02-16 2018-08-23 キヤノン株式会社 光伝送装置、光伝送方法および被検体情報取得装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797504A (en) * 1980-12-10 1982-06-17 Furukawa Electric Co Ltd:The Forming method for end part of light guide
JPH03229204A (ja) * 1990-02-05 1991-10-11 Sumitomo Electric Ind Ltd プラスチッククラッド光ファイバシート
JP2003121662A (ja) * 2001-10-09 2003-04-23 Totoku Electric Co Ltd ライトガイドバンドルおよびその製造方法
JP2003322730A (ja) * 2002-04-30 2003-11-14 Sumitomo Electric Ind Ltd バンドルファイバ、これを用いた光源装置およびその製造方法
JP2013254144A (ja) * 2012-06-08 2013-12-19 Ushio Inc 貼り合わせ方法
JP2014106253A (ja) * 2012-11-22 2014-06-09 Fujikura Ltd バンドル型マルチコアファイバ
US20150055915A1 (en) * 2013-08-23 2015-02-26 Corning Incorporated Light-coupling apparatus and methods for light-diffusing optical fibers
JP2018506027A (ja) * 2014-12-23 2018-03-01 ゾロ テクノロジーズ，インコーポレイティド 広間隔波長のためのｔｄｌａｓ構造
JP2016148709A (ja) * 2015-02-10 2016-08-18 住友電気工業株式会社 光ファイバユニットおよび光ケーブル
JP2018130367A (ja) * 2017-02-16 2018-08-23 キヤノン株式会社 光伝送装置、光伝送方法および被検体情報取得装置

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JPWO2024075226A1 (https=) 2024-04-11

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