WO2011004539A1 - Structure de liaison de multiples âmes de fibres optiques et procédé de fabrication de celle-ci - Google Patents

Structure de liaison de multiples âmes de fibres optiques et procédé de fabrication de celle-ci Download PDF

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Publication number
WO2011004539A1
WO2011004539A1 PCT/JP2010/003468 JP2010003468W WO2011004539A1 WO 2011004539 A1 WO2011004539 A1 WO 2011004539A1 JP 2010003468 W JP2010003468 W JP 2010003468W WO 2011004539 A1 WO2011004539 A1 WO 2011004539A1
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Prior art keywords
optical fiber
optical fibers
coupling structure
core
optical
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PCT/JP2010/003468
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English (en)
Japanese (ja)
Inventor
八若正義
金井一晃
佐竹武史
谷口浩一
大泉晴郎
阿久津剛二
Original Assignee
三菱電線工業株式会社
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Publication of WO2011004539A1 publication Critical patent/WO2011004539A1/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
    • G02B6/04—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
    • G02B6/02042—Multicore optical fibres

Definitions

  • the present invention relates to an optical fiber multi-core coupling structure and a method for manufacturing the same.
  • an optical combiner having a coupling portion in which one end portions of a plurality of optical fibers are bundled is configured, and a laser oscillator having the same performance is provided at the other end portion.
  • a method of emitting lasers from a plurality of laser oscillators collectively from the emission end of the coupling portion by connecting the lasers and inputting the lasers for example, Patent Document 1.
  • one end portions of a plurality of optical fibers each having a relatively high refractive index core and a relatively low refractive index cladding covering the core are bundled.
  • a coupling part configured as follows: The coupling portion is formed by bundling a plurality of rod members thinner than the plurality of optical fibers together with the plurality of optical fibers, and fusing them together.
  • the method for manufacturing a multi-core coupling structure of an optical fiber according to the present invention includes: a first end portion of a plurality of optical fibers each having a core having a relatively high refractive index and a clad having a relatively low refractive index covering the core; Are bundled together with a plurality of rod members, and they are fused and integrated to form a joint.
  • FIG. 1 is a perspective view showing an optical combiner of Embodiment 1.
  • FIG. It is a perspective view which shows an optical fiber core wire.
  • 3 is a front view of an end face of a coupling portion in the optical combiner of Embodiment 1.
  • FIG. 3 is an end face photograph of a coupling portion of the optical combiner according to the first embodiment.
  • (A) And (b) is a front view of the end surface of the connection part at the time of using a pipe material.
  • (A) And (b) is a cross-sectional view of a pipe material.
  • A) And (b) is a front view of the end surface of the mode coupling
  • FIG. 3 is an explanatory diagram of a method for manufacturing the optical combiner according to the first embodiment.
  • (A)-(d) is sectional drawing which shows the state which filled the pipe fiber with the optical fiber and the rod material. It is a perspective view which shows the optical combiner of Embodiment 2.
  • FIG. It is a front view of the end surface of the coupling part in the optical combiner of Embodiment 2. It is a perspective view which shows a thin diameter optical fiber core wire. It is an end surface photograph of the joint part of the conventional optical combiner.
  • FIG. 1 shows an optical combiner 100 having a multi-core coupling structure of optical fibers according to the first embodiment.
  • the optical combiner 100 according to the first embodiment is an optical device used for collecting and emitting lasers from a plurality of laser oscillators, for example.
  • the optical combiner 100 of the first embodiment includes a plurality of optical fiber cores 110.
  • the number of optical fiber cores 110 is, for example, 2 to 37 (seven in FIG. 1).
  • FIG. 2 shows the optical fiber core wire 110.
  • the plurality of optical fiber cores 110 may be configured by the same optical fiber core 110, or may be configured by mixing different optical fiber cores 110.
  • Each of the plurality of optical fiber cores 110 has a configuration in which an optical fiber 111 is covered with a coating layer 112.
  • the optical fiber 111 has a core 111a having a relatively high refractive index provided at the center of the fiber and a clad 111b having a relatively low refractive index provided concentrically so as to cover the core 111a.
  • the fiber diameter of the optical fiber 111 is, for example, 100 to 1500 ⁇ m.
  • the core 111a is preferably made of quartz.
  • the quartz core 111a may be doped with a dopant such as germanium (Ge) that increases the refractive index, but is preferably non-doped quartz that is not doped with a dopant.
  • the softening temperature of the core 111a is about 1700 ° C.
  • the core diameter is, for example, 50 to 1200 ⁇ m.
  • the clad 111b is preferably made of quartz.
  • the quartz clad 111b may be non-doped quartz that is not doped with a dopant, or may be doped with a dopant such as fluorine (F) or boron (B) that lowers the refractive index.
  • the softening temperature of the clad 111b is about 1600 ° C.
  • the clad 111b has a relatively low refractive index and a lower refractive index than the core 111a.
  • the thickness of the clad 111b is, for example, 10 to 150 ⁇ m.
  • the covering layer 112 is formed, for example, in a double layer in which a silicon resin layer and a polyamide resin layer are sequentially laminated from the inside.
  • a silicon resin layer and a polyamide resin layer are sequentially laminated from the inside.
  • the optical combiner 100 includes a plurality of rods that are thinner than the plurality of optical fibers 111 from which the coating layers 112 are peeled off at one end of the plurality of optical fiber cores 110.
  • the material 120 is bundled, and the joint part 130 formed by melting and integrating them is configured.
  • the coupling portion 130 has a configuration in which the cores 111a of the plurality of optical fibers 111 are arranged at intervals in a cladding coupling portion 131 in which the cladding 111b of the optical fiber 111 and the rod member 120 are integrally formed. Have.
  • the coupling portion is configured, and the adhesive burns due to the heat of the high-power laser, which may damage the laser guide.
  • the coupling portion is configured by bundling one end of a plurality of optical fibers and mechanically fixing them without using an adhesive, when dust or dirt enters the gap between the optical fibers, Because they cannot be removed, the high power laser may burn the dust and dirt, which may damage the laser guide.
  • the circular shape of the cross-section of the 'core 111a' is deformed, and light spreads beyond the numerical aperture of the optical fiber 111 having a circular cross section at the deformed portion, so that the quality of the laser is impaired and the optical fiber having a circular cross section
  • the optical fiber having the same numerical aperture as that of the bundle is connected, there is a problem that light spreading beyond the numerical aperture leaks from the connected optical fiber and causes loss.
  • the coupling portion 130 is formed by bundling a plurality of rod materials 120 thinner than them together with the plurality of optical fibers 111, and these are formed by fusion and integration.
  • the rod material 120 is interposed in the gap between the optical fibers 111 to restrict the flow of the optical fiber 111, particularly the clad 111b, thereby suppressing the deformation of the cross-sectional shape of the optical fiber 111, As a result, it is possible to suppress the quality of light emitted from the coupling unit 130 from being impaired, and it is possible to suppress loss due to light leakage.
  • the plurality of rod members 120 may be composed of the rod members 120 having the same material, shape, etc., or may be composed of a mixture of different rod members 120.
  • a large-diameter rod material 120 is provided between the optical fibers 111 outside the bundle of optical fibers 111, and a small-diameter rod material 120 is provided between the optical fibers 111 inside the bundle of optical fibers 111. It has been.
  • the rod member 120 is preferably made of quartz, and may be made of the same material as that of the clad 111b of the optical fiber 111 from the viewpoint of forming the uniform clad coupling portion 131.
  • the rod member 120 made of quartz may be doped with a dopant such as germanium (Ge) that increases the refractive index, or may be non-doped quartz that is not doped with a dopant.
  • the rod member 120 may have a circular cross-sectional shape or a polygon such as a triangle.
  • the softening temperature of the rod member 120 is about 1700 ° C., but from the viewpoint of regulating the deformation of the optical fiber 111 by starting the flow before the optical fiber 111 melts and sealing the gap between the optical fibers 111.
  • the temperature is preferably equal to or lower than the softening temperature of the core 111a and the clad 111b of the optical fiber 111.
  • the refractive index of the rod member 120 is preferably the same as the refractive index of the clad 111 b of the optical fiber 111 from the viewpoint of forming a uniform clad coupling part 131.
  • the rod member 120 has an outer diameter of about 150 ⁇ m, but is accommodated in a gap between the optical fibers 111 formed in the plurality of optical fibers 111 provided in the closest packing state. It is preferable that it is a size.
  • the plurality of optical fibers 111 and the plurality of rod members 120 are regularly closely packed and fused and integrated, but may be irregularly bundled and melted and integrated. .
  • the coupling unit 130 may have a configuration in which a bundle of a plurality of optical fibers 111 and a plurality of rod members 120 is integrated in a pipe member 140.
  • the pipe material 140 is preferably made of quartz, and is preferably made of the same material as the optical fiber 111.
  • the pipe material 140 has a length of 30 to 100 mm, the outer diameter is 1.40 to 2.00 mm, and the core diameter is 1200 ⁇ m and 4 cores. 30 to 100 mm and the outer diameter is 4.00 to 5.00 mm.
  • the coupling unit 130 may have a configuration in which a plurality of optical fibers 111 and a plurality of rod members 120 are bundled by a pipe member 140 and integrated with each other. As shown to (b), the structure by which the pipe material 140 of another body was covered on the part 130a in which the some optical fiber 111 was integrated may be sufficient.
  • the coupling portion 130 functions to confine light by air cladding.
  • the pipe material 140 connects the plurality of optical fibers 111 from the viewpoint of obtaining a higher light confinement effect. It is preferable to have a layer formed of a material having a lower refractive index than the material to be formed.
  • the pipe material 140 is doped with low refraction made of quartz doped with a dopant that lowers the refractive index, such as F (fluorine) or B (boron). 6 (b), and the inner doped low refractive index layer 141 and the outer non-doped high refractive index formed of quartz doped with such a dopant.
  • the layer 142 may be included.
  • the pipe material 140 may be formed of non-doped quartz that is not doped with a dopant.
  • the coupling portion 130 includes the clads 111b of the plurality of optical fibers 111, as shown in FIG.
  • a plurality of cores 111a are disposed in the clad coupling part 131 where the two are coupled to each other with a space therebetween, and a low refractive index layer 132 is provided by the doped low refractive index layer 141 of the pipe material 140 so as to cover them. It becomes the composition which was made.
  • the thickness of the low refractive index layer 132 is, for example, 50 to 500 ⁇ m.
  • the coupling portion 130 is formed as shown in FIG.
  • a plurality of cores 111a are disposed at intervals in a clad coupling portion 131 in which clads 111b of a plurality of optical fibers 111 are coupled to each other, and the pipe material 140 is covered so as to cover them.
  • a low-refractive index layer 132 made of an inner doped low-refractive index layer 141 that is an inner peripheral side portion is provided, and a support by an outer non-doped high-refractive index layer 142 that is an outer peripheral side portion of the pipe material 140 so as to cover it.
  • the layer 133 is provided.
  • the thickness of the low refractive index layer 132 is, for example, 10 to 100 ⁇ m.
  • the softening temperature of the pipe material 140 itself or at least the inner layer which is the inner peripheral side portion thereof is lower than the softening temperatures of the cores 111a and the clads 111b of the plurality of optical fibers 111.
  • the pipe material 140 melted earlier than the clad 111b or the inner doped low-refractive index layer 141, which is the inner peripheral portion thereof flows into the gap between the optical fibers 111 during the melt processing, and thereby the optical fiber.
  • the collapse of the structure of the 111 core 111a and the clad 111b can be suppressed. Therefore, the movement of light between the optical fibers 111 can be suppressed, and for example, the occurrence of unevenness in the emission pattern when emitted to the lens system can be suppressed.
  • the pipe material 140 itself or at least the inner layer preferably has the same refractive index as the clad 111b of the plurality of optical fibers 111.
  • the clad 111b of the plurality of optical fibers 111 may be made of the same material, while being melted faster than the optical fiber 111 and flows into the gap between the optical fibers 111, thereby the structure of the core 111a and the clad 111b.
  • the optical fiber 111 may be formed of a material having a softening temperature lower than that of the core 111a and the clad 111b.
  • the pipe material 140 itself or the outer layer is a part other than the pipe material 140 and the core 111a and the clad 111b of the plurality of optical fibers 111. It is preferable that the softening temperature is high. According to such a configuration, the pipe member 140 or the outer layer that is the outer peripheral side portion thereof is most difficult to melt during the melting process, whereby the joint portion 130 can be formed in a state in which the outer shape of the pipe member 140 is retained.
  • the optical combiner 100 peels the coating layer 112 at one end portion of the plurality of optical fiber cores 110, and ends one end portion and a plurality of end portions of the plurality of optical fibers 111.
  • the rod member 120 is heated in a bundled state, thereby melting and integrating them to form a joint 130, and then cleaving that portion to form an end face and polishing the end face be able to.
  • a coating layer is formed at one end of the plurality of optical fiber cores 110.
  • one end of a plurality of optical fibers 111 and a plurality of rod members 120 are inserted into a pipe member 140 and heated in a bundled state, thereby fusing them together and joining them. It can be manufactured by forming the portion 130 and cleaving the portion to form an end face and polishing the end face.
  • one end portion of the plurality of optical fiber cores 110 in the case of the configuration shown in FIG. 5B in which a separate pipe material 140 is covered on a portion where the plurality of optical fibers 111 and the plurality of rod members 120 are integrated, one end portion of the plurality of optical fiber cores 110.
  • the coating layer 112 is peeled off, and one end portions of the plurality of optical fibers 111 and the plurality of rod members 120 are heated in a bundled state, thereby melting and integrating them, and the pipe member 140 is put thereon to cover the coupling portion. It can be manufactured by forming 130 and cleaving the part to form an end face and polishing the end face.
  • heating means a torch, a carbon dioxide laser, etc. are mentioned, for example.
  • the heating temperature is, for example, 1200 to 2000 ° C. although it depends on the material of the optical fiber 111 and the like.
  • the optical combiner 100 according to the first embodiment can be used in a case where light is incident on a plurality of optical fibers 111 from a light source or a fiber laser, and is propagated and emitted from the coupling unit 130. Can also be used in applications in which light is incident from, propagated, distributed from a plurality of optical fibers 111, and emitted.
  • all of the plurality of optical fibers 111 may be used for laser transmission. However, in addition to such usage, only a part of them is used for laser transmission. May be used for purposes other than laser transmission, such as for laser monitoring.
  • a fiber 111 may be included.
  • the optical fiber 111 and the optical fiber 111 and the optical fiber 111 and the rod member 120 formed with the coupling portion 130 are formed by the above method. Since the space factor of the optical fiber 111 in the cross section of the bundle of rod members 120 is low, the effect of suppressing deformation of the cross-sectional shape of the optical fiber 111 by the rod member 120 is relatively low.
  • the coupling portion 130 is formed by the seven optical fibers 111 and the rod member 120, and two or three of the optical fibers 111 are used for laser transmission, the light is transmitted. Since the space factor of the optical fiber 111 in the cross section of the bundle of the fiber 111 and the rod material 120 becomes high, the deformation suppression effect of the cross-sectional shape of the optical fiber 111 by the rod material 120 becomes relatively high, and light with very little deformation. Laser transmission can be performed by the fiber 111. Further, when a failure occurs in the two to three optical fibers 111 used for laser transmission, the remaining unused optical fibers 111 can be used as an alternative.
  • the pipe member 140 is filled with a plurality of optical fibers 111 each having a fiber diameter of 1 mm so that the bundles are inscribed, and between the pipe member 140 and the bundle of optical fibers 111, and at the end.
  • the space factor of the optical fiber 111 in the cross section when a plurality of rod members 120 are filled so as to fit between the optical fibers 111 not tightly packed will be described.
  • Table 1 shows two optical fibers 111 and two rod members 120 as shown in FIG. 9A, and three optical fibers 111 and three rod members as shown in FIG. 9B.
  • 120 four optical fibers 111 and five rod members 120 as shown in FIG. 9 (c), and seven optical fibers 111 and six rods as shown in FIG. 9 (d).
  • the material 120 calculation of the void space factor in the pipe material and the optical fiber space factor in the pipe material in a cross section in a state where the pipe material 140 is filled with the plurality of optical fibers 111 and the plurality of rod materials 120 Results are shown.
  • the space factor in the pipe material is 28% for the two optical fibers 111 and the two rod members 120, 20% for the three optical fibers 111 and the three rod members 120, and four
  • the case of the optical fiber 111 and the five rod members 120 is 17%
  • the case of the seven optical fibers 111 and the six rod members 120 is 14%.
  • the optical fiber space factor in the pipe material is 50% in the case of two optical fibers 111 and two rod members 120, 65% in the case of three optical fibers 111 and three rod members 120, and four.
  • the optical fiber 111 and the five rod members 120 are 69%, and the seven optical fibers 111 and the six rod members 120 are 78%.
  • FIG. 1 shows an optical combiner 100 having an optical fiber multi-core coupling structure according to the second embodiment.
  • the optical combiner 100 of the second embodiment is also an optical device used for collecting and emitting lasers from a plurality of laser oscillators, for example.
  • the part of the same name as Embodiment 1 is shown with the same code
  • FIG. 1 shows an optical combiner 100 having an optical fiber multi-core coupling structure according to the second embodiment.
  • the optical combiner 100 of the second embodiment is also an optical device used for collecting and emitting lasers from a plurality of laser oscillators, for example.
  • the part of the same name as Embodiment 1 is shown with the same code
  • the optical combiner 100 in the optical combiner 100 according to the first embodiment, in the optical combiner 100 according to the first embodiment, instead of the large-diameter rod member 120 provided between the optical fibers 111 outside the bundle of the optical fibers 111, the finer than the optical fiber 111. It has a configuration in which a diameter optical fiber 151 is provided. Specifically, at one end of the plurality of optical fiber cores 110, a plurality of optical fibers 111 from which the coating layer 112 has been peeled are bundled, and a plurality of small-diameter optical fiber cores 150 (which are thinner than them).
  • a plurality of small-diameter optical fibers 151 from which the coating layer 152 has been peeled are disposed between the optical fibers 111 outside the bundle of optical fibers 111, and inside the bundle of optical fibers 111.
  • the rod member 120 is bundled so as to be disposed between the optical fibers 111, and a coupling portion 130 is formed by melting and integrating them.
  • the plurality of small-diameter optical fibers 151 can be used for purposes other than laser transmission, such as for laser monitoring.
  • FIG. 12 shows a thin optical fiber core wire 150.
  • the plurality of small-diameter optical fiber cores 150 may be configured by the same small-diameter optical fiber core 150, or may be configured by mixing different small-diameter optical fiber cores 150.
  • Each of the plurality of thin optical fiber cores 150 has a configuration in which the thin optical fiber 151 is covered with a coating layer 152.
  • the small-diameter optical fiber 151 has a relatively high refractive index core 151a provided at the center of the fiber and a relatively low refractive index clad 151b provided concentrically so as to cover the core 151a.
  • the fiber diameter of the thin optical fiber 151 is, for example, 100 to 500 ⁇ m.
  • the core 151a is preferably made of quartz.
  • the quartz core 151a may be doped with a dopant such as germanium (Ge) that increases the refractive index, but is preferably non-doped quartz that is not doped with a dopant.
  • the softening temperature of the core 151a is about 1700 ° C.
  • the core diameter is, for example, 50 to 400 ⁇ m.
  • the clad 151b is preferably made of quartz.
  • the quartz clad 151b may be non-doped quartz that is not doped with a dopant, or may be doped with a dopant such as fluorine (F) or boron (B) that lowers the refractive index.
  • the softening temperature of the clad 151b starts from flowing before the optical fiber 111 is melted to seal the gap between the optical fibers 111, thereby restricting the deformation of the optical fiber 111, so that the core 111a and the clad of the optical fiber 111 are controlled. It is preferably below the softening temperature of 111b.
  • the clad 151b has a relatively low refractive index and a lower refractive index than the core 151a.
  • the thickness of the clad 151b is, for example, 25 to 225 ⁇ m.
  • the covering layer 152 is made of, for example, an ultraviolet curable acrylic resin.
  • the light-proof combiner 100 having the coupling portion 130 at one end is taken as an example.
  • the embodiment is not particularly limited thereto, and may be a heat-resistant bundle having coupling portions at both ends. .
  • the coupling portion 130 is the exit end.
  • the present invention is not particularly limited to this, and another optical fiber core wire is connected to the coupling portion 130 at the exit end.
  • an optical coupling device can be configured by connecting a quartz rod made of a single material such as pure quartz.
  • the present invention relates to an optical fiber multi-core coupling structure and a method for manufacturing the same.
  • Optical combiner (optical fiber multi-core coupling structure) DESCRIPTION OF SYMBOLS 110 Optical fiber core wire 111 Optical fiber 111a Core 111b Clad 112 Coating layer 120 Rod material 130 Coupling part 131 Clad coupling part 132 Low refractive index layer 133 Support layer 140 Pipe material 141 Doped low refractive index layer (inner peripheral side part) 142 Non-doped High Refractive Index Layer 150 Thin Optical Fiber Core 151 Thin Optical Fiber (Rod Material) 151a Core 151b Clad 152 Coating layer

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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)

Abstract

L'invention porte sur une structure (100) pour relier de multiples âmes de fibres optiques. La structure (100) comporte une section de liaison (130) configurée par liaison des extrémités de multiples fibres optiques (111) comprenant une âme (111a) ayant un indice de réfraction relativement élevé et une gaine (111b) recouvrant l'âme (111a) et ayant un indice de réfraction relativement faible. La section de liaison (130) est formée par liaison des multiples fibres optiques (111) et de multiples éléments tiges (120) plus minces que les fibres optiques et par leur fusion en un seul tenant.
PCT/JP2010/003468 2009-07-09 2010-05-24 Structure de liaison de multiples âmes de fibres optiques et procédé de fabrication de celle-ci WO2011004539A1 (fr)

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JP2009162561 2009-07-09
JP2009-162561 2009-07-09
JP2009265420A JP2011034040A (ja) 2009-07-09 2009-11-20 光コンバイナ及びその製造方法
JP2009-265420 2009-11-20

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CN114072712A (zh) * 2019-08-09 2022-02-18 株式会社藤仓 光合并器、激光装置、以及光合并器的制造方法
CN112352176B (zh) * 2018-05-04 2023-09-12 努布鲁有限公司 三包层光纤

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