WO2014077069A1 - Optical multiplexer device - Google Patents

Optical multiplexer device Download PDF

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Publication number
WO2014077069A1
WO2014077069A1 PCT/JP2013/077821 JP2013077821W WO2014077069A1 WO 2014077069 A1 WO2014077069 A1 WO 2014077069A1 JP 2013077821 W JP2013077821 W JP 2013077821W WO 2014077069 A1 WO2014077069 A1 WO 2014077069A1
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Prior art keywords
optical fiber
optical
lens member
fiber
light
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PCT/JP2013/077821
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French (fr)
Japanese (ja)
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大登　正敬
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富士電機株式会社
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Publication of WO2014077069A1 publication Critical patent/WO2014077069A1/en

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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
    • 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
    • G02B6/2848—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 having refractive means, e.g. imaging elements between light guides as splitting, branching and/or combining devices, e.g. lenses, holograms
    • 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
    • G02B6/04—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
    • G02B6/24—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
    • 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
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends

Definitions

  • the present invention relates to an optical multiplexing device that combines a plurality of lights.
  • Patent Documents 1 and 2 disclose techniques for multiplexing light.
  • the technique described in Patent Document 1 combines light by coupling one end of a plurality of waveguides.
  • the technique described in Patent Document 2 combines light by welding a plurality of optical fibers on the input side to one optical fiber on the output side.
  • Patent Document 3 describes the following optical switch device. First, the light incident surfaces of a plurality of optical fibers on which output light is incident are aligned with each other. Then, by sliding the parabolic mirror parallel to these incident surfaces, the optical fiber on which light is incident is switched.
  • Patent Document 4 describes that light emitted from a light source is collimated using a reflecting surface having a curved surface.
  • an object of the present invention is to provide a compact optical multiplexer.
  • the optical multiplexer includes a plurality of first optical fibers, second optical fibers, lens members, and third optical fibers.
  • the second optical fiber has a plurality of cores.
  • the plurality of first optical fibers are optically connected to different cores of the second optical fiber at one end of the second optical fiber.
  • the lens member is opposed to the other end of the second fiber.
  • One end of the third optical fiber is opposed to the other end of the second fiber via the lens member.
  • the optical multiplexing device can be miniaturized.
  • FIG. 1 is a cross-sectional view illustrating a configuration of an optical multiplexing device 10 according to the first embodiment.
  • the optical multiplexing device 10 according to the present embodiment includes a plurality of first optical fibers 110, a second optical fiber 120, a lens member 130, and a third optical fiber 140.
  • the second optical fiber 120 has a plurality of cores 122. At one end 124 of the second optical fiber 120, the plurality of first optical fibers 110 are optically connected to different cores 122.
  • the lens member 130 faces the other end 126 of the second optical fiber 120.
  • the third optical fiber 140 has one end 144 opposed to the other end 126 of the second optical fiber 120 via the lens member 130. Details will be described below.
  • the first optical fiber 110 is a single mode fiber, for example, and has one core 112. However, the first optical fiber 110 may be a multimode fiber. In the present embodiment, one end 114 of the first optical fiber 110 is joined to one end 124 of the second optical fiber 120. However, the one end 114 of the first optical fiber 110 and the one end 124 of the second optical fiber 120 may be optically connected via a connector.
  • the one end 114 of the first optical fiber 110 is thinner than the other part of the first optical fiber 110 because it is melted and stretched when it is joined to the one end 124 of the second optical fiber 120. Further, the core 112 of the first optical fiber 110 is joined to the core 122 of the second optical fiber 120.
  • the number of first optical fibers 110 is the same as the number of cores 122 of the second optical fiber 120, but may be smaller than the number of cores 122.
  • the second optical fiber 120 is a multi-core fiber having a plurality of cores 122.
  • a multi-core fiber used for communication can be used.
  • the plurality of cores 122 are parallel to each other.
  • the lens member 130 condenses the light emitted from the plurality of cores 122 on one end 144 of the third optical fiber 140.
  • the lens member 130 is made of a translucent material, one end 132 is joined to the other end 126 of the second optical fiber 120, and the other end 134 is a curved surface. In this way, the coupling loss of light can be reduced.
  • the curved surface of the other end 134 is a paraboloid, for example.
  • the lens member 130 is formed using, for example, a graded index fiber. In this case, one end 132 of the lens member 130 and the other end 126 of the second optical fiber 120 are welded.
  • the other end 134 of the lens member 130 is formed into a curved surface by polishing, for example. However, the other end 134 may be processed into a curved surface by, for example, arc discharge.
  • the lens member 130 is formed using a graded index fiber, the one end 132 of the lens member 130 can be easily joined to the other end 126 of the second optical fiber 120.
  • the third optical fiber 140 is, for example, a single mode fiber and has one core 142. However, the third optical fiber 140 may be a multimode fiber. The third optical fiber 140 is preferably arranged so that a portion of the core 142 positioned at the one end 144 overlaps the focal point of the lens member 130.
  • the optical multiplexing device 10 includes a holding member 150.
  • the holding member 150 holds the other end 126 of the second optical fiber 120, the third optical fiber 140, and one end 144 of the third optical fiber 140.
  • the second optical fiber 120, the lens member 130, and the third optical fiber 140 are fixed so that the central axes overlap each other.
  • the holding member 150 is, for example, a cylindrical member, and the inner wall holds the other end 126 of the second optical fiber 120, the third optical fiber 140, and one end 144 of the third optical fiber 140.
  • the holding member 150 is cylindrical and the inner diameter thereof is equal to the diameter of the second optical fiber 120. Or slightly smaller.
  • FIG. 2 is a cross-sectional view of the second optical fiber 120.
  • the second optical fiber 120 has a plurality of cores 122.
  • one core 122 is disposed on the central axis of the second optical fiber 120, and the remaining cores 122 are disposed on a circumference centered on the central axis of the second optical fiber 120. ing.
  • the same number of first optical fibers 110 as the number of cores 122 is provided. However, the number of first optical fibers 110 may be smaller than the number of cores 122.
  • the first optical fiber 110 is connected to the core 122 positioned on the central axis of the second optical fiber 120, and the first optical fiber 110 is connected to any one of 122 positioned other than the central axis of the second optical fiber 120.
  • the plurality of cores 122 are disposed in the clad 127.
  • the clad 127 is covered with a protective film 128.
  • a method for joining the plurality of first optical fibers 110 and the second optical fibers 120 will be described.
  • a plurality of first optical fibers 110 are bundled.
  • the bundle of the plurality of first optical fibers 110 is partially heated and stretched. Thereby, the bundle
  • the bundle of the plurality of first optical fibers 110 is cut at the thinned portion. This cut surface becomes one end 114 of the first optical fiber 110.
  • one end 114 of the first optical fiber 110 and one end 124 of the second optical fiber 120 are melt-bonded.
  • the diameter of the mode field of the core 112 is increased by heating the core 112 positioned at the one end 114 of the first optical fiber 110. For this reason, the coupling loss between the first optical fiber 110 and the second optical fiber 120 is low.
  • FIG. 3 is a diagram for explaining an example of use of the optical multiplexing device 10.
  • Light enters the plurality of first optical fibers 110 from the light source 200.
  • the light source 200 has a laser light source, for example.
  • At least one light source 200 may further include a wavelength conversion element. That is, the plurality of light sources 200 may emit light having the same wavelength, or at least one light source 200 may emit light having a wavelength different from that of the other light sources 200.
  • the light incident on the first optical fiber 110 from the light source 200 enters the core 122 of the second optical fiber 120 from one end 114 of the first optical fiber 110.
  • the light incident on the core 122 enters the lens member 130 from the other end 126 of the second optical fiber 120.
  • the light incident on the lens member 130 enters the core 142 located at one end 144 of the third optical fiber 140 via the lens member 130.
  • the core 142 located at the one end 144 of the third optical fiber 140 coincides with the focal point of the lens member 130, the light emitted from the other end 126 of the second optical fiber 120 is highly efficient and the third light.
  • the light enters the core 142 of the fiber 140.
  • the lens member 130 is formed using a graded index fiber, the light propagating through the center of the lens member 130 spreads in the mode field but converges near the exit end face due to the influence of the refractive index distribution. To come. For this reason, the light emitted from the core 122 located on the central axis of the second optical fiber 120 is collected without being deviated from the central axis of the third optical fiber 140.
  • the light emitted from the core 122 located in the peripheral portion of the second optical fiber 120 propagates in the peripheral portion of the lens member 130. Since the graded index fiber has a high refractive index at the central portion and a low refractive index at the peripheral portion, the light propagating through the peripheral portion of the lens member 130 is gradually bent toward the central portion. Further, the light is refracted in the direction of entering the core 142 of the third optical fiber 140 when emitted from the other end 134 of the lens member 130.
  • the coupling efficiency in the optical multiplexing device 10 is about 60%, for example.
  • the apparatus including the light source 200 and the optical multiplexing device 10 includes, for example, an optical signal transmission device, a light source for a spectroscopic measurement device and a spectroscopic analysis device, a light source for a laser processing device, a light source for a laser microscope, a light source for a DNA analysis device, and an endoscope It is used as a light source for an eye fundus or a fundus examination apparatus.
  • the optical multiplexer 10 can be made small.
  • the light incident surface of the first optical fiber 110 and the light output surface of the third optical fiber 140 can be positioned to face each other, the light incident direction with respect to the optical multiplexing device 10 and the optical multiplexing The emission direction of light from the device 10 can be matched.
  • FIG. 4 is a cross-sectional view illustrating a configuration of the optical multiplexing device 10 according to the second embodiment.
  • the optical multiplexing device 10 according to the present embodiment has the same configuration as that of the optical multiplexing device 10 according to the first embodiment, except that the other end 134 of the lens member 130 has a shape along a spherical surface. is there. Also according to this embodiment, the same effect as that of the first embodiment can be obtained.
  • FIG. 5 is a cross-sectional view illustrating the configuration of the optical multiplexing device 10 according to the third embodiment.
  • the optical multiplexing apparatus 10 according to the present embodiment has the same configuration as that of the optical multiplexing apparatus 10 according to the first or second embodiment, except that an antireflection film 136 is provided.
  • the antireflection film 136 is provided on the other end 134 of the lens member 130.
  • the antireflection film 136 is a dielectric film, for example, and is formed using a vapor deposition method or the like.
  • the same effect as that of the first embodiment can be obtained. Further, since the antireflection film 136 is formed on the other end 134 of the lens member 130, it is possible to multiplex light with higher efficiency.

Abstract

In the present invention, a second optical fiber (120) has a plurality of cores (122). At one end of the second optical fiber (120), a plurality of first optical fibers (110) are each optically connected to differing cores (122). A lens member (130) faces the other end (126) of the second optical fiber (120). One end (144) of a third optical fiber (140) faces the other end (126) of the second optical fiber (120) with the lens member (130) therebetween. The one end (144) of the third optical fiber (140) preferably is positioned at the focal point of the lens member (130).

Description

光合波装置Optical multiplexer
　本発明は、複数の光を合波する光合波装置に関する。 The present invention relates to an optical multiplexing device that combines a plurality of lights.
　複数のレーザ光源から出射された複数の光を一つの光ファイバに入射するためには、これら複数の光を合波する必要がある。光を合波するための技術としては、例えば特許文献１，２に記載のものがある。特許文献１に記載の技術は、複数の導波路の一端を結合させることにより光を合波するものである。また特許文献２に記載の技術は、入力側の複数の光ファイバを、出力側の一つの光ファイバに溶着させることにより、光を合波するものである。 In order to allow a plurality of lights emitted from a plurality of laser light sources to enter one optical fiber, it is necessary to combine the plurality of lights. For example, Patent Documents 1 and 2 disclose techniques for multiplexing light. The technique described in Patent Document 1 combines light by coupling one end of a plurality of waveguides. The technique described in Patent Document 2 combines light by welding a plurality of optical fibers on the input side to one optical fiber on the output side.
　一方、特許文献３には、以下の光スイッチ装置が記載されている。まず、出力光が入射される複数の光ファイバの光入射面を互いにそろえておく。そして、これらの入射面に対して平行に放物面鏡をスライドさせることにより、光が入射する光ファイバを切り替える。 On the other hand, Patent Document 3 describes the following optical switch device. First, the light incident surfaces of a plurality of optical fibers on which output light is incident are aligned with each other. Then, by sliding the parabolic mirror parallel to these incident surfaces, the optical fiber on which light is incident is switched.
　また特許文献４には、光源から出射した光を、表面が湾曲した反射面を用いてコリメートすることが記載されている。 Patent Document 4 describes that light emitted from a light source is collimated using a reflecting surface having a curved surface.
特開２００６－３３０４３６号公報JP 2006-330436 A 特表２００７－１６３６５０号公報Special table 2007-163650 gazette 特開２００８－１４５４５９号公報JP 2008-145459 A 特表２００６－５１７６７５号公報Special table 2006-517675
　本発明者は、光合波装置を小型化することを検討した。すなわち本発明が目的とするところは、小型の光合波装置を提供することにある。 The present inventor studied to downsize the optical multiplexing device. That is, an object of the present invention is to provide a compact optical multiplexer.
　本発明によれば、光合波装置は、複数の第１光ファイバ、第２光ファイバ、レンズ部材、及び第３光ファイバを備えている。第２光ファイバは複数のコアを有している。複数の第１光ファイバは、第２光ファイバの一端において、第２光ファイバの互いに異なるコアに光学的に接続されている。レンズ部材は、第２ファイバの他端に対向している。第３光ファイバの一端は、レンズ部材を介して第２ファイバの他端に対向している。 According to the present invention, the optical multiplexer includes a plurality of first optical fibers, second optical fibers, lens members, and third optical fibers. The second optical fiber has a plurality of cores. The plurality of first optical fibers are optically connected to different cores of the second optical fiber at one end of the second optical fiber. The lens member is opposed to the other end of the second fiber. One end of the third optical fiber is opposed to the other end of the second fiber via the lens member.
　本発明によれば、光合波装置を小型化することができる。 According to the present invention, the optical multiplexing device can be miniaturized.
　上述した目的、およびその他の目的、特徴および利点は、以下に述べる好適な実施の形態、およびそれに付随する以下の図面によってさらに明らかになる。 The above-described object and other objects, features, and advantages will be further clarified by a preferred embodiment described below and the following drawings attached thereto.
第１の実施形態に係る光合波装置の構成を示す断面図である。It is sectional drawing which shows the structure of the optical multiplexing apparatus which concerns on 1st Embodiment. 第２光ファイバの断面図である。It is sectional drawing of a 2nd optical fiber. 光合波装置の使用例を説明するための図である。It is a figure for demonstrating the usage example of an optical multiplexer. 第２の実施形態に係る光合波装置の構成を示す断面図である。It is sectional drawing which shows the structure of the optical multiplexing apparatus which concerns on 2nd Embodiment. 第３の実施形態に係る光合波装置の構成を示す断面図である。It is sectional drawing which shows the structure of the optical multiplexing apparatus which concerns on 3rd Embodiment.
　以下、本発明の実施の形態について、図面を用いて説明する。尚、すべての図面において、同様な構成要素には同様の符号を付し、適宜説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.
（第１の実施形態）
　図１は、第１の実施形態に係る光合波装置１０の構成を示す断面図である。本実施形態に係る光合波装置１０は、複数の第１光ファイバ１１０、第２光ファイバ１２０、レンズ部材１３０、及び第３光ファイバ１４０を備えている。第２光ファイバ１２０は複数のコア１２２を有している。第２光ファイバ１２０の一端１２４において、複数の第１光ファイバ１１０は、互いに異なるコア１２２に光学的に接続されている。レンズ部材１３０は、第２光ファイバ１２０の他端１２６に対向している。第３光ファイバ１４０は、一端１４４がレンズ部材１３０を介して第２光ファイバ１２０の他端１２６に対向している。以下、詳細に説明する。 (First embodiment)
FIG. 1 is a cross-sectional view illustrating a configuration of an optical multiplexing device 10 according to the first embodiment. The optical multiplexing device 10 according to the present embodiment includes a plurality of first optical fibers 110, a second optical fiber 120, a lens member 130, and a third optical fiber 140. The second optical fiber 120 has a plurality of cores 122. At one end 124 of the second optical fiber 120, the plurality of first optical fibers 110 are optically connected to different cores 122. The lens member 130 faces the other end 126 of the second optical fiber 120. The third optical fiber 140 has one end 144 opposed to the other end 126 of the second optical fiber 120 via the lens member 130. Details will be described below.
　第１光ファイバ１１０は、例えばシングルモードファイバであり、一つのコア１１２を有している。ただし第１光ファイバ１１０は、マルチモードファイバであってもよい。本実施形態において、第１光ファイバ１１０の一端１１４は、第２光ファイバ１２０の一端１２４に接合されている。ただし、第１光ファイバ１１０の一端１１４と第２光ファイバ１２０の一端１２４は、コネクタを介して光学的に接続していても良い。 The first optical fiber 110 is a single mode fiber, for example, and has one core 112. However, the first optical fiber 110 may be a multimode fiber. In the present embodiment, one end 114 of the first optical fiber 110 is joined to one end 124 of the second optical fiber 120. However, the one end 114 of the first optical fiber 110 and the one end 124 of the second optical fiber 120 may be optically connected via a connector.
　第１光ファイバ１１０の一端１１４は、第２光ファイバ１２０の一端１２４に接合される際に溶融延伸されているため、第１光ファイバ１１０の他の部分より細くなっている。また、第１光ファイバ１１０のコア１１２は、第２光ファイバ１２０のコア１２２に接合されている。第１光ファイバ１１０の数は、例えば第２光ファイバ１２０のコア１２２の数と同数であるが、コア１２２の数よりも少なくても良い。 The one end 114 of the first optical fiber 110 is thinner than the other part of the first optical fiber 110 because it is melted and stretched when it is joined to the one end 124 of the second optical fiber 120. Further, the core 112 of the first optical fiber 110 is joined to the core 122 of the second optical fiber 120. For example, the number of first optical fibers 110 is the same as the number of cores 122 of the second optical fiber 120, but may be smaller than the number of cores 122.
　第２光ファイバ１２０は、複数のコア１２２を有するマルチコアファイバである。第２光ファイバ１２０としては、例えば通信用に用いられるマルチコアファイバを用いることができる。複数のコア１２２は互いに平行である。 The second optical fiber 120 is a multi-core fiber having a plurality of cores 122. As the second optical fiber 120, for example, a multi-core fiber used for communication can be used. The plurality of cores 122 are parallel to each other.
　レンズ部材１３０は、複数のコア１２２から出射した光を第３光ファイバ１４０の一端１４４に集光する。本実施形態において、レンズ部材１３０は、透光性の材料から形成されており、一端１３２が第２光ファイバ１２０の他端１２６に接合しており、他端１３４が曲面になっている。このようにすると、光の結合損失を低くすることができる。なお、他端１３４の曲面は、例えば放物面である。 The lens member 130 condenses the light emitted from the plurality of cores 122 on one end 144 of the third optical fiber 140. In the present embodiment, the lens member 130 is made of a translucent material, one end 132 is joined to the other end 126 of the second optical fiber 120, and the other end 134 is a curved surface. In this way, the coupling loss of light can be reduced. The curved surface of the other end 134 is a paraboloid, for example.
　レンズ部材１３０は、例えばグレーテッドインデックスファイバを用いて形成されている。この場合、レンズ部材１３０の一端１３２と第２光ファイバ１２０の他端１２６は、溶着されている。また、レンズ部材１３０の他端１３４は、例えば研磨によって曲面に形成されている。ただし他端１３４は、例えばアーク放電によって曲面に加工されていても良い。レンズ部材１３０をグレーテッドインデックスファイバを用いて形成すると、レンズ部材１３０の一端１３２を容易に第２光ファイバ１２０の他端１２６に接合することができる。 The lens member 130 is formed using, for example, a graded index fiber. In this case, one end 132 of the lens member 130 and the other end 126 of the second optical fiber 120 are welded. The other end 134 of the lens member 130 is formed into a curved surface by polishing, for example. However, the other end 134 may be processed into a curved surface by, for example, arc discharge. When the lens member 130 is formed using a graded index fiber, the one end 132 of the lens member 130 can be easily joined to the other end 126 of the second optical fiber 120.
　第３光ファイバ１４０は、例えばシングルモードファイバであり、一つのコア１４２を有している。ただし第３光ファイバ１４０はマルチモードファイバであってもよい。第３光ファイバ１４０は、好ましくは、コア１４２のうち一端１４４に位置する部分がレンズ部材１３０の焦点と重なるように配置されている。 The third optical fiber 140 is, for example, a single mode fiber and has one core 142. However, the third optical fiber 140 may be a multimode fiber. The third optical fiber 140 is preferably arranged so that a portion of the core 142 positioned at the one end 144 overlaps the focal point of the lens member 130.
　また光合波装置１０は、保持部材１５０を備えている。保持部材１５０は、第２光ファイバ１２０の他端１２６、第３光ファイバ１４０、及び第３光ファイバ１４０の一端１４４を保持している。第２光ファイバ１２０、レンズ部材１３０、及び第３光ファイバ１４０は、中心軸が互いに重なるように固定されている。保持部材１５０は例えば筒状の部材であり、内壁が第２光ファイバ１２０の他端１２６、第３光ファイバ１４０、及び第３光ファイバ１４０の一端１４４を保持している。なお、第２光ファイバ１２０の直径、レンズ部材１３０の直径、及び第３光ファイバ１４０の直径が互いに等しい場合、保持部材１５０は円筒状であり、その内径が第２光ファイバ１２０の直径に等しいか、わずかに小さい。 The optical multiplexing device 10 includes a holding member 150. The holding member 150 holds the other end 126 of the second optical fiber 120, the third optical fiber 140, and one end 144 of the third optical fiber 140. The second optical fiber 120, the lens member 130, and the third optical fiber 140 are fixed so that the central axes overlap each other. The holding member 150 is, for example, a cylindrical member, and the inner wall holds the other end 126 of the second optical fiber 120, the third optical fiber 140, and one end 144 of the third optical fiber 140. When the diameter of the second optical fiber 120, the diameter of the lens member 130, and the diameter of the third optical fiber 140 are equal to each other, the holding member 150 is cylindrical and the inner diameter thereof is equal to the diameter of the second optical fiber 120. Or slightly smaller.
　図２は、第２光ファイバ１２０の断面図である。上記したように、第２光ファイバ１２０は複数のコア１２２を有している。本図に示す例において、一つのコア１２２は第２光ファイバ１２０の中心軸に配置されており、残りのコア１２２は、第２光ファイバ１２０の中心軸を中心とした円周上に配置されている。第１光ファイバ１１０は、コア１２２の数と同数設けられているのが好ましい。ただし、第１光ファイバ１１０の数がコア１２２の数より少なくても良い。この場合、第２光ファイバ１２０の中心軸に位置するコア１２２には第１光ファイバ１１０が接続され、第２光ファイバ１２０の中心軸以外に位置する１２２のいずれかに、第１光ファイバ１１０が接続されないようにするのが好ましい。なお、複数のコア１２２はクラッド１２７内に配置されている。そしてクラッド１２７は、保護膜１２８で被覆されている。 FIG. 2 is a cross-sectional view of the second optical fiber 120. As described above, the second optical fiber 120 has a plurality of cores 122. In the example shown in the figure, one core 122 is disposed on the central axis of the second optical fiber 120, and the remaining cores 122 are disposed on a circumference centered on the central axis of the second optical fiber 120. ing. It is preferable that the same number of first optical fibers 110 as the number of cores 122 is provided. However, the number of first optical fibers 110 may be smaller than the number of cores 122. In this case, the first optical fiber 110 is connected to the core 122 positioned on the central axis of the second optical fiber 120, and the first optical fiber 110 is connected to any one of 122 positioned other than the central axis of the second optical fiber 120. Are preferably not connected. The plurality of cores 122 are disposed in the clad 127. The clad 127 is covered with a protective film 128.
　次に、複数の第１光ファイバ１１０と第２光ファイバ１２０との接合方法を説明する。まず、複数の第１光ファイバ１１０を束ねる。そして複数の第１光ファイバ１１０の束を部分的に加熱し、引き伸ばす。これにより、複数の第１光ファイバ１１０の束は、部分的に細くなる。そしてこの細くなった部分で複数の第１光ファイバ１１０の束を切断する。この切断面は、第１光ファイバ１１０の一端１１４となる。その後、第１光ファイバ１１０の一端１１４と第２光ファイバ１２０の一端１２４とを溶融接合する。なお、これらの工程において、第１光ファイバ１１０の一端１１４に位置するコア１１２を加熱することにより、コア１１２のモードフィールドの径は広がる。このため、第１光ファイバ１１０と第２光ファイバ１２０の結合損失は低くなる。 Next, a method for joining the plurality of first optical fibers 110 and the second optical fibers 120 will be described. First, a plurality of first optical fibers 110 are bundled. Then, the bundle of the plurality of first optical fibers 110 is partially heated and stretched. Thereby, the bundle | flux of the some 1st optical fiber 110 becomes thin partially. Then, the bundle of the plurality of first optical fibers 110 is cut at the thinned portion. This cut surface becomes one end 114 of the first optical fiber 110. Thereafter, one end 114 of the first optical fiber 110 and one end 124 of the second optical fiber 120 are melt-bonded. In these steps, the diameter of the mode field of the core 112 is increased by heating the core 112 positioned at the one end 114 of the first optical fiber 110. For this reason, the coupling loss between the first optical fiber 110 and the second optical fiber 120 is low.
　図３は、光合波装置１０の使用例を説明するための図である。複数の第１光ファイバ１１０には、それぞれ光源２００から光が入射される。光源２００は、例えばレーザ光源を有している。少なくとも一つの光源２００は、さらに波長変換素子を有していてもよい。すなわち複数の光源２００は、互いに同一の波長の光を出射しても良いし、少なくとも一つの光源２００が、他の光源２００とは異なる波長の光を出射しても良い。 FIG. 3 is a diagram for explaining an example of use of the optical multiplexing device 10. Light enters the plurality of first optical fibers 110 from the light source 200. The light source 200 has a laser light source, for example. At least one light source 200 may further include a wavelength conversion element. That is, the plurality of light sources 200 may emit light having the same wavelength, or at least one light source 200 may emit light having a wavelength different from that of the other light sources 200.
　光源２００から第１光ファイバ１１０に入射された光は、第１光ファイバ１１０の一端１１４から第２光ファイバ１２０のコア１２２に入射する。そしてコア１２２に入射された光は、第２光ファイバ１２０の他端１２６から、レンズ部材１３０に入射される。レンズ部材１３０に入射された光は、レンズ部材１３０を介して、第３光ファイバ１４０の一端１４４に位置するコア１４２に入射する。このようにして、複数の光源２００から出射した光は、いずれも第３光ファイバ１４０に集光されるため、合波された状態で外部に出射する。 The light incident on the first optical fiber 110 from the light source 200 enters the core 122 of the second optical fiber 120 from one end 114 of the first optical fiber 110. The light incident on the core 122 enters the lens member 130 from the other end 126 of the second optical fiber 120. The light incident on the lens member 130 enters the core 142 located at one end 144 of the third optical fiber 140 via the lens member 130. Thus, since all the light emitted from the plurality of light sources 200 is condensed on the third optical fiber 140, it is emitted to the outside in a combined state.
　ここで、第３光ファイバ１４０の一端１４４に位置するコア１４２がレンズ部材１３０の焦点に一致していた場合、第２光ファイバ１２０の他端１２６から出射した光は、高効率で第３光ファイバ１４０のコア１４２に入射する。 Here, when the core 142 located at the one end 144 of the third optical fiber 140 coincides with the focal point of the lens member 130, the light emitted from the other end 126 of the second optical fiber 120 is highly efficient and the third light. The light enters the core 142 of the fiber 140.
　なお、レンズ部材１３０がグレーテッドインデックスファイバを用いて形成されていた場合、レンズ部材１３０の中央部を伝搬する光は、モードフィールドは広がるが、屈折率の分布の影響により、出射端面付近では収束するようになる。このため、第２光ファイバ１２０の中心軸に位置するコア１２２から出射される光は、第３光ファイバ１４０の中心軸よりずれることなく集光される。 Note that when the lens member 130 is formed using a graded index fiber, the light propagating through the center of the lens member 130 spreads in the mode field but converges near the exit end face due to the influence of the refractive index distribution. To come. For this reason, the light emitted from the core 122 located on the central axis of the second optical fiber 120 is collected without being deviated from the central axis of the third optical fiber 140.
　一方、第２光ファイバ１２０の周辺部に位置するコア１２２から出射される光は、レンズ部材１３０の周辺部を伝搬する。グレーテッドインデックスファイバは中央部の屈折率が高く、周辺部の屈折率は低いため、レンズ部材１３０の周辺部を伝搬する光は中央部へ向かうように徐々に曲がっていく。さらにその光は、レンズ部材１３０の他端１３４から出射される際に、第３光ファイバ１４０のコア１４２に入射する方向に屈折する。 On the other hand, the light emitted from the core 122 located in the peripheral portion of the second optical fiber 120 propagates in the peripheral portion of the lens member 130. Since the graded index fiber has a high refractive index at the central portion and a low refractive index at the peripheral portion, the light propagating through the peripheral portion of the lens member 130 is gradually bent toward the central portion. Further, the light is refracted in the direction of entering the core 142 of the third optical fiber 140 when emitted from the other end 134 of the lens member 130.
　なお、光源２００が発光する光の波長が５００ｎｍ以上６００ｎｍ以下の範囲である場合、光合波装置１０における結合効率は、例えば６０％程度になる。 In addition, when the wavelength of the light emitted from the light source 200 is in the range of 500 nm to 600 nm, the coupling efficiency in the optical multiplexing device 10 is about 60%, for example.
　光源２００及び光合波装置１０を有する装置は、例えば光信号の送信装置、分光計測装置や分光分析装置の光源、レーザ加工装置の光源、レーザ顕微鏡用の光源、DNA分析装置用光源、内視鏡用の光源、又は眼底検査装置用の光源として使用される。 The apparatus including the light source 200 and the optical multiplexing device 10 includes, for example, an optical signal transmission device, a light source for a spectroscopic measurement device and a spectroscopic analysis device, a light source for a laser processing device, a light source for a laser microscope, a light source for a DNA analysis device, and an endoscope It is used as a light source for an eye fundus or a fundus examination apparatus.
　以上、本実施形態によれば、第２光ファイバ１２０を用いているため、複数の光源２００から出射される光の進行方向を容易に平行にすることができる。このため、第２光ファイバ１２０と第３光ファイバ１４０の間にレンズ部材１３０を配置することにより、容易に複数の光源２００から出射される光を第３光ファイバ１４０で合波することができる。このため、光合波装置１０を小さくすることができる。 As mentioned above, according to this embodiment, since the 2nd optical fiber 120 is used, the advancing direction of the light radiate | emitted from the several light source 200 can be made parallel easily. Therefore, by arranging the lens member 130 between the second optical fiber 120 and the third optical fiber 140, the light emitted from the plurality of light sources 200 can be easily multiplexed by the third optical fiber 140. . For this reason, the optical multiplexer 10 can be made small.
　また、第１光ファイバ１１０における光の入射面と、第３光ファイバ１４０における光の出射面を互いに対向する方向に位置させることができるため、光合波装置１０に対する光の入射方向と、光合波装置１０からの光の出射方向とを一致させることができる。 In addition, since the light incident surface of the first optical fiber 110 and the light output surface of the third optical fiber 140 can be positioned to face each other, the light incident direction with respect to the optical multiplexing device 10 and the optical multiplexing The emission direction of light from the device 10 can be matched.
（第２の実施形態）
　図４は、第２の実施形態に係る光合波装置１０の構成を示す断面図である。本実施形態に係る光合波装置１０は、レンズ部材１３０の他端１３４が球面に沿った形状を有している点を除いて、第１の実施形態に係る光合波装置１０と同様の構成である。
　本実施形態によっても、第１の実施形態と同様の効果を得ることができる。 (Second Embodiment)
FIG. 4 is a cross-sectional view illustrating a configuration of the optical multiplexing device 10 according to the second embodiment. The optical multiplexing device 10 according to the present embodiment has the same configuration as that of the optical multiplexing device 10 according to the first embodiment, except that the other end 134 of the lens member 130 has a shape along a spherical surface. is there.
Also according to this embodiment, the same effect as that of the first embodiment can be obtained.
（第３の実施形態）
　図５は、第３の実施形態に係る光合波装置１０の構成を示す断面図である。本実施形態に係る光合波装置１０は、反射防止膜１３６を有している点を除いて、第１又は第２の実施形態に係る光合波装置１０と同様の構成である。 (Third embodiment)
FIG. 5 is a cross-sectional view illustrating the configuration of the optical multiplexing device 10 according to the third embodiment. The optical multiplexing apparatus 10 according to the present embodiment has the same configuration as that of the optical multiplexing apparatus 10 according to the first or second embodiment, except that an antireflection film 136 is provided.
　反射防止膜１３６は、レンズ部材１３０の他端１３４に設けられている。反射防止膜１３６は、例えば誘電体膜であり、蒸着法などを用いて形成されている。 The antireflection film 136 is provided on the other end 134 of the lens member 130. The antireflection film 136 is a dielectric film, for example, and is formed using a vapor deposition method or the like.
　本実施形態によっても、第１の実施形態と同様の効果を得ることができる。また、レンズ部材１３０の他端１３４に反射防止膜１３６が形成されているため、さらに高い効率で光を合波することができる。 Also in this embodiment, the same effect as that of the first embodiment can be obtained. Further, since the antireflection film 136 is formed on the other end 134 of the lens member 130, it is possible to multiplex light with higher efficiency.
　以上、図面を参照して本発明の実施形態について述べたが、これらは本発明の例示であり、上記以外の様々な構成を採用することもできる。 As described above, the embodiments of the present invention have been described with reference to the drawings. However, these are exemplifications of the present invention, and various configurations other than the above can be adopted.
　この出願は、２０１２年１１月１９日に出願された日本出願特願２０１２－２５２９３４を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2012-252934 filed on November 19, 2012, the entire disclosure of which is incorporated herein.

Claims (5)

  1. 　複数の第１光ファイバと、
    　複数のコアを有している第２ファイバと、
    　前記第２ファイバの他端に対向しているレンズ部材と、
    　一端が前記レンズ部材を介して前記第２光ファイバの前記他端に対向している第３光ファイバと、
    を備え、
    　前記第２ファイバの一端において、前記複数の第１光ファイバは、互いに異なる前記コアに光学的に接続されている光合波装置。     A plurality of first optical fibers;
    A second fiber having a plurality of cores;
    A lens member facing the other end of the second fiber;
    A third optical fiber having one end facing the other end of the second optical fiber through the lens member;
    With
    At one end of the second fiber, the plurality of first optical fibers are optically connected to different cores from each other.
  2. 　請求項１に記載の光合波装置において、
    　前記第３光ファイバの前記一端は、前記レンズ部材の焦点に位置している光合波装置。     The optical multiplexing device according to claim 1,
    The optical multiplexing device in which the one end of the third optical fiber is located at a focal point of the lens member.
  3. 　請求項１又は２に記載の光合波装置において、
    　前記レンズ部材は、一端が前記第２ファイバの前記他端に接合しており、他端が曲面になっている光合波装置。     The optical multiplexing device according to claim 1 or 2,
    One end of the lens member is bonded to the other end of the second fiber, and the other end is a curved surface.
  4. 　請求項３に記載の光合波装置において、
    　前記レンズ部材は、グレーテッドインデックスファイバの端面を曲面に加工したものである光合波装置。     In the optical multiplexing device according to claim 3,
    The said lens member is an optical multiplexing apparatus which processed the end surface of the graded index fiber into the curved surface.
  5. 　請求項４に記載の光合波装置において、
    　前記レンズ部材の前記曲面に設けられた反射防止膜を備える光合波装置。     The optical multiplexing device according to claim 4, wherein
    An optical multiplexing device comprising an antireflection film provided on the curved surface of the lens member.
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JP2014102305A (en) 2014-06-05

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