WO2015046409A1 - Module pour élément optique - Google Patents

Module pour élément optique Download PDF

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Publication number
WO2015046409A1
WO2015046409A1 PCT/JP2014/075578 JP2014075578W WO2015046409A1 WO 2015046409 A1 WO2015046409 A1 WO 2015046409A1 JP 2014075578 W JP2014075578 W JP 2014075578W WO 2015046409 A1 WO2015046409 A1 WO 2015046409A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
optical element
optical
optical fiber
hole
Prior art date
Application number
PCT/JP2014/075578
Other languages
English (en)
Japanese (ja)
Inventor
徳一 宮崎
加藤　圭
Original Assignee
住友大阪セメント株式会社
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 住友大阪セメント株式会社 filed Critical 住友大阪セメント株式会社
Publication of WO2015046409A1 publication Critical patent/WO2015046409A1/fr

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Classifications

    • 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
    • G02B6/4248—Feed-through connections for the hermetical passage of fibres through a package wall

Definitions

  • the present invention relates to an optical element module, and more particularly, to an optical element module in which an optical element is accommodated in a casing and an optical fiber introduced into the casing and the optical element are optically coupled.
  • Optical elements such as optical modulators are frequently used in the optical communication field and the optical measurement field. Many of these optical elements are used as an optical element module in which an optical element is accommodated in a metal casing.
  • the optical element module is configured to introduce an optical fiber through a through hole provided in a side wall of the casing, optically couple the optical element inside the casing and the optical fiber, and seal the through hole. ing.
  • Patent Document 1 describes that a sealing structure of an optical fiber is sealed and fixed by using a through pipe without applying an excessive force to the optical fiber at an oblique incidence.
  • Patent Document 2 discloses a method of fixing an optical fiber when a fixing pipe is used to reduce the size of an optical element module.
  • Patent Document 3 discloses an optical element package having improved workability using an insertion pipe having a slit.
  • Patent Document 1 and Patent Document 2 there is a problem that the pipe portion is a separate body and the cost is increased. Moreover, in the structure like patent document 3, since the diameter of an insertion pipe is large, it is difficult for solder to flow between a pipe and an optical fiber, and sealing with a case wall part is difficult. Moreover, since the heating time required for the sealing operation becomes long, there is a problem that damage to the fiber coating and the protective member disposed outside the fiber coating increases.
  • the problem to be solved by the present invention is to solve the above-mentioned problems, have a small and low-cost structure, improve the working efficiency in the sealing work, and reduce the optical damage to the fiber coating and the like.
  • An element module is provided.
  • the optical element module of the present invention has the following technical features.
  • a housing for storing the optical element is provided, and the optical element is optically coupled to an optical fiber introduced into the housing through a through hole provided in a side wall of the housing.
  • a protective member for protecting the optical fiber led out from the through hole is arranged in a part of the optical fiber, and the fiber fixing portion integrated with the housing is interposed through the protective member.
  • a gap between the bare fiber part from which the optical fiber coating is removed and the side wall is sealed and fixed with a metal material inside the through hole.
  • the inner diameter of the through hole is 0.3 mm to 0.9 mm.
  • the inner diameter of the through hole is larger than the outer diameter of the bare fiber portion from which the fiber coating is removed, and is equal to or smaller than the outer diameter of the protective member. It is characterized by being set.
  • the optical fiber is butt-connected to the optical element, and the optical axis of the optical fiber at the connection portion passes through the optical element module. It is in the range of the inner diameter of the hole.
  • a housing for storing an optical element is provided, and the optical element is optically coupled to an optical fiber introduced into the housing through a through hole provided in a side wall of the housing.
  • a protective member that protects the optical fiber led out from the through hole is arranged in a part of the optical fiber, and the protective member is attached by a fiber fixing portion integrated with the housing.
  • the optical element module that holds the optical fiber via the gap between the bare fiber portion from which the optical fiber coating is removed and the side wall is sealed and fixed with a metal material inside the through hole.
  • the size of the through-hole formed in the first and second holes is small, and the fiber fixing part serves only to hold the optical fiber coated with the fiber, so that the structure can be simplified.
  • the sealing operation is easy, and in particular, reliable sealing can be performed between the optical fiber and the side wall. When sealing, the time required for the soldering operation can be shortened, and thermal damage to the fiber coating is small.
  • FIG. 1 shows an embodiment of the optical element module of the present invention.
  • the present invention includes a housing for storing an optical element, and the optical element is optically coupled to an optical fiber introduced into the housing through a through hole provided in a side wall of the housing. Outside the housing, a protective member that protects the optical fiber led out from the through hole is arranged in a part of the optical fiber, and the protective member is attached by a fiber fixing portion integrated with the housing.
  • a gap between the bare fiber portion from which the optical fiber coating is removed and the side wall is sealed and fixed with a metal material inside the through hole.
  • the “bare fiber part” in the present invention means an optical fiber composed only of a core and a clad, and “optical fiber strand” in which a thin protective film (primary coating) such as UV coating is applied to the bare fiber part. It is distinguished from an “optical fiber core wire” in which a protective film made of a resin such as nylon is used for a coating layer (secondary coating) covering the optical fiber.
  • the coated state of the optical fiber other than the sealing portion of the housing may have a coating as long as it does not greatly affect the metallization process or the sealing process.
  • the covering state of the optical fiber in the portion inserted into the housing depends on the size of the through hole in the housing side wall, but at least the secondary coating is preferably removed from the viewpoint of work efficiency. .
  • optical fiber coating in the present invention mainly means the above “primary coating”.
  • protective member in the present invention corresponds to the “secondary coating” and “loose tube” as described later.
  • a through hole is provided on the side wall of the housing, and the fiber fixing portion is integrally processed on the side wall or joined by welding or soldering so as to be connected to the through hole.
  • the optical fiber bare fiber portion
  • the side wall This eliminates the need for parts such as a pipe penetrating through, thereby reducing the size and reducing the number of parts.
  • FIG. 2 shows the shape of the fiber fixing part bonded to the side wall of the casing.
  • FIG. 2A is a view seen from above
  • FIG. 2B is a cross-sectional view taken along the dotted line AA in FIG.
  • the fiber fixing part is a cylindrical body such as a cylinder, and a slit is formed in a part of the outer periphery so that the optical fiber can be easily inserted.
  • the side of the fiber fixing portion to be joined to the housing has a tapered inner diameter as shown in FIG. 1, and an opening connected to the through hole in the side wall is formed.
  • a bare fiber part the part inserted into the housing may have a coating remaining within a range not hindering sealing
  • the optical fiber can be smoothly inserted from the fiber fixing part into the through hole in the side wall, and further inside the housing, and not only the workability is improved, but also the push-in condition and the amount of bending of the optical fiber can be easily adjusted. Become.
  • the width w of the slit may be set to be wider than the width of the coated or protected optical fiber (including the primary coating, the secondary coating, or the loose tube). This is a series of operations from inserting the bare fiber part from which the fiber coating has been removed into the through hole, positioning the optical fiber, then performing the sealing operation, and finally fixing the optical fiber to the fiber fixing part. It is set so that it is easy to perform.
  • the bare fiber part from which the fiber coating has been removed is inserted from the fiber fixing part, and the tip of the optical fiber is connected to the optical element by butt connection (butt joint) or the like.
  • butt connection butt joint
  • FIG. 1 an optical element in which an optical waveguide such as an optical modulator is formed is illustrated as the optical element, but the optical element of the present invention is not limited to this.
  • the optical fiber is sealed and fixed in the through hole provided in the side wall of the housing.
  • the fiber coating is removed, and in order to maintain sealing performance, a metal film, for example, Au or the like is formed on the glass portion of the optical fiber by vapor deposition or plating through a base metal such as Cr ( Metallization process).
  • a metal film for example, Au or the like is formed on the glass portion of the optical fiber by vapor deposition or plating through a base metal such as Cr ( Metallization process).
  • Cr Metallization process
  • it may be pre-soldered with a special metal solder for glass.
  • the coating state of the optical fiber other than the sealing portion of the casing there may be a coating as long as it does not greatly affect the metallization process or the sealing process.
  • the covering state of the optical fiber in the portion inserted into the housing depends on the size of the through hole in the housing side wall, but at least the secondary coating is preferably removed from the viewpoint of work efficiency. .
  • Solder paste or the like is injected into the sealing portion from the work hole or slit provided in the fiber fixing portion, and a soldering iron or the like is brought into contact with the concave portion formed on the housing side of the fiber fixing portion to locally heat, or induction Solder paste or the like is melted by a heating means or the like and hermetically sealed between a case (through hole inner wall) plated with a metal such as Au and the optical fiber.
  • the diameter of the bare fiber part from which the fiber coating is removed is a single mode fiber, it is about 0.125 mm. Therefore, by setting the inner diameter of the through hole to about 0.3 mm to 0.9 mm, a capillary phenomenon occurs when the solder is melted. Thus, the solder can be fixed to the inside of the side wall of the housing uniformly and efficiently.
  • the inner diameter of the through hole is larger than the outer diameter of the bare fiber part from which the fiber coating has been removed and less than the outer diameter of the protective member (secondary coating, loose tube, etc.) that protects the optical fiber.
  • the position of the through hole and the size of the inner diameter are determined by inserting the optical fiber into the through hole and connecting the optical fiber to the optical element so that the optical axis of the optical fiber at the connection portion is the through hole.
  • the through hole is provided on the extension line of the optical axis connected to the optical element so that the optical fiber is in contact with the through hole and the optical fiber is not damaged at the time of alignment and fixing with the optical element.
  • the through hole is inclined with respect to the side wall, so that the optical element and the optical fiber can be connected to each other while maintaining the Snell angle.
  • the optical element and the optical fiber are not in a straight line, it is possible to suppress an excessive stress from being applied to the connection portion between the optical element and the optical fiber.
  • an optical fiber having a fiber coating or a protective member is placed inside the fiber fixing portion, and the opening end of the fiber fixing portion is closed with a fiber fixing auxiliary member. Then, an adhesive is poured from the slit or the working hole to fix at least the optical fiber coated with the fiber and the fiber fixing portion.
  • the amount of the adhesive poured into the slit or the working hole of the fiber fixing portion may be such that both the bare fiber portion from which the fiber coating is removed and the optical fiber covered with the fiber are fixed.
  • a protective member such as a loose tube.
  • a protective member such as a loose tube, it is desirable that these are also fixed to the fiber fixing portion with an adhesive.
  • the inner diameter of the fiber fixing part is desirably about 0.3 to 2 mm larger than the outer diameter of the fiber-coated optical fiber housed in the fiber fixing part (or the outer diameter of the protective member). If the inner diameter of the fiber fixing part is too small, it will interfere with the inflow of the adhesive when a highly viscous adhesive is used, and this will affect the bond strength between the fiber-coated optical fiber (or protective member) and the fiber fixing part. . If the inner diameter of the fiber fixing part is too large, a large amount of adhesive is required for fixing.
  • the fiber fixing portion is connected in an oblique direction (not vertical) to the side wall of the housing, but can also be connected to the side wall vertically.
  • an excessive force is applied to the optical fiber, increasing the loss and stress. Damage due to can be prevented.
  • the shape of the fiber fixing portion is not limited to a cylindrical shape, and may be a square shape or the like.
  • the housing-side portion of the fiber fixing portion can have a thin structure to improve heat conduction to the solder and shorten the heating time. Thereby, damage to the fiber coating can also be suppressed.
  • an optical element module having a small and low-cost structure, improving the working efficiency in the sealing operation, and reducing the heat damage to the fiber coating. It becomes possible to do.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

L'invention a pour objet de mettre en oeuvre un module pour élément optique présentant une structure de petite taille et de faible coût, dont l'efficacité de fonctionnement et le scellage sont améliorés, et dont le risque de détérioration thermique d'une gaine optique est réduit. On décrit un module pour élément optique comprenant un boîtier pour loger un élément optique. L'élément optique est couplé optiquement à une fibre optique introduite dans le boîtier à travers un trou traversant ménagé dans une paroi latérale du boîtier. A l'extérieur du boîtier, un élément de protection de la fibre optique sortant du trou traversant est disposé sur une partie de la fibre optique. La fibre optique est retenue par une section de fixation de la fibre solidarisée au boîtier du fait que l'élément de protection est placé entre la section de fixation de la fibre et la fibre optique. Le module pour élément optique se caractérise en ce que, dans le trou traversant, un espace situé entre la paroi latérale et une section nue de la fibre dont la gaine est retirée est scellé et fixé au moyen d'un matériau métallique.
PCT/JP2014/075578 2013-09-30 2014-09-26 Module pour élément optique WO2015046409A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-205188 2013-09-30
JP2013205188A JP5825315B2 (ja) 2013-09-30 2013-09-30 光学素子モジュール

Publications (1)

Publication Number Publication Date
WO2015046409A1 true WO2015046409A1 (fr) 2015-04-02

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PCT/JP2014/075578 WO2015046409A1 (fr) 2013-09-30 2014-09-26 Module pour élément optique

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JP (1) JP5825315B2 (fr)
WO (1) WO2015046409A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180284371A1 (en) * 2017-03-31 2018-10-04 Sumitomo Osaka Cement Co., Ltd Optical element module

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017097091A (ja) * 2015-11-20 2017-06-01 日本電気株式会社 光通信モジュールおよび該光通信モジュールの製造方法
JP6649843B2 (ja) 2016-05-13 2020-02-19 Ｎｔｔエレクトロニクス株式会社 光回路
JP6995384B2 (ja) * 2019-08-22 2022-01-14 湖北工業株式会社 光ファイバフィードスルー

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07199003A (ja) * 1993-12-28 1995-08-04 Sumitomo Osaka Cement Co Ltd 光素子用筺体構造
JP2003098495A (ja) * 2001-09-21 2003-04-03 Sumitomo Osaka Cement Co Ltd 出力光モニタ付光導波路型光変調器
JP2013190631A (ja) * 2012-03-14 2013-09-26 Sumitomo Osaka Cement Co Ltd 光デバイス・モジュール及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07199003A (ja) * 1993-12-28 1995-08-04 Sumitomo Osaka Cement Co Ltd 光素子用筺体構造
JP2003098495A (ja) * 2001-09-21 2003-04-03 Sumitomo Osaka Cement Co Ltd 出力光モニタ付光導波路型光変調器
JP2013190631A (ja) * 2012-03-14 2013-09-26 Sumitomo Osaka Cement Co Ltd 光デバイス・モジュール及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180284371A1 (en) * 2017-03-31 2018-10-04 Sumitomo Osaka Cement Co., Ltd Optical element module

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Publication number Publication date
JP5825315B2 (ja) 2015-12-02
JP2015069130A (ja) 2015-04-13

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