WO2015046409A1 - Optical element module - Google Patents

Optical element module 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
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Prior art keywords
fiber
optical element
optical
optical fiber
hole
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PCT/JP2014/075578
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French (fr)
Japanese (ja)
Inventor
徳一 宮崎
加藤　圭
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住友大阪セメント株式会社
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Publication of WO2015046409A1 publication Critical patent/WO2015046409A1/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
    • G02B6/42—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.

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  • 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

The purpose of the present invention is to provide an optical element module, which is provided with a small and low-cost structure, and whereby operation efficiency of sealing operations is improved, and a thermal damage of a fiber coat is reduced. Disclosed is an optical element module wherein: a housing for housing an optical element is provided; the optical element is optically coupled to an optical fiber introduced into the housing through a through hole that is provided in a side wall of the housing; and outside of the housing, a protection member that protects the optical fiber led out from the through hole is disposed on a part of the optical fiber, and the optical fiber is held by means of a fiber fixing section integrally formed with the housing by having the protection member between the fiber fixing section and the optical fiber. The optical element module is characterized in that, in the through hole, a gap between the side wall and a bare fiber section having an optical fiber coat removed therefrom is sealed and fixed using a metal material.

Description

光学素子モジュールOptical element module
　本発明は、光学素子モジュールに関するものであり、特に、光学素子を筐体内に収容し、該筐体の内部に導入した光ファイバと該光学素子とを光学的に結合した光学素子モジュールに関する。 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.
　光通信分野や光計測分野において、光変調器などの光学素子が多用されている。これらの光学素子の多くは、金属の筐体内に光学素子を収容された光学素子モジュールとして使用される。光学素子モジュールでは、筐体の側壁に設けた貫通穴を通じて光ファイバを導入し、筐体内部ある光学素子と該光ファイバとを光学的に結合すると共に、該貫通穴を封止するよう構成されている。 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.
　特許文献１には、光ファイバの封止構造について、貫通パイプを利用して斜め入射で光ファイバに無理な力を加えることなく封止固定することが記載されている。 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.
　特許文献２には、光学素子モジュールを小型化するために、固定用パイプを用いた場合の光ファイバの固定方法が開示されている。 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.
　特許文献３には、スリットをもった挿通パイプを用いて作業性を向上させた光素子パッケージが開示されている。 Patent Document 3 discloses an optical element package having improved workability using an insertion pipe having a slit.
　特許文献１や特許文献２に開示された従来技術では、パイプ部が別体となっており、コストが高くなるという問題がある。また、特許文献３のような構造では、挿通パイプの径が大きいため、半田がパイプと光ファイバとの間に流れ難く、ケース壁部での封止は難しい。また、封止作業に必要な加熱時間が長くなるため、ファイバ被覆やその外側に配置される保護部材へのダメージが大きくなるという問題もある。 In the prior art disclosed in 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.
特開平７－１９９００３号公報Japanese Patent Laid-Open No. 7-199003 特開２００４－１４５２５３号公報JP 2004-145253 A 特開２００９－１２８６７７号公報JP 2009-128677 A
　本発明が解決しようとする課題は、上述したような問題を解決し、小型で低コストな構造を備え、封止作業での作業効率が向上すると共に、ファイバ被覆等への熱ダメージも少ない光学素子モジュールを提供することである。 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.
　上記課題を解決するため、本発明の光学素子モジュールは、以下のような技術的特徴を有する。
（１）　光学素子を収納する筐体を備え、該光学素子は、該筐体の側壁に設けられた貫通穴を通じて該筐体内に導入された光ファイバと光学的に結合しており、該筐体の外部では、該貫通穴から導出された光ファイバを保護する保護部材が該光ファイバの一部に配置されると共に、該筐体と一体化しているファイバ固定部により、該保護部材を介して該光ファイバを保持する光学素子モジュールにおいて、該貫通穴の内部では、光ファイバの被覆が除去されたベアファイバ部と該側壁との隙間が金属材料で封止固定されていることを特徴とする。 In order to solve the above problems, the optical element module of the present invention has the following technical features.
(1) 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. Outside the body, 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. In the optical element module that holds the optical fiber, 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. To do.
（２）　上記（１）に記載の光学素子モジュールにおいて、該貫通穴の内径は、０．３ｍｍ～０．９ｍｍであることを特徴とする。 (2) In the optical element module according to (1), the inner diameter of the through hole is 0.3 mm to 0.9 mm.
（３）　上記（１）又は（２）に記載の光学素子モジュールにおいて、該貫通穴の内径は、該ファイバ被覆が除去されたベアファイバ部の外径より大きく、該保護部材の外径以下に設定されていることを特徴とする。 (3) In the optical element module according to (1) or (2) above, 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.
（４）　上記（１）乃至（３）のいずれかに記載の光学素子モジュールにおいて、該光学素子に該光ファイバが突き合わせ接続されており、当該接続部での光ファイバの光軸が、該貫通穴の内径の範囲内にあることを特徴とする。 (4) In the optical element module according to any one of (1) to (3), 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.
（５）　上記（１）乃至（４）のいずれかに記載の光学素子モジュールにおいて、該貫通穴は、該側壁に対して傾斜していることを特徴とする。 (5) The optical element module according to any one of (1) to (4), wherein the through hole is inclined with respect to the side wall.
　本発明により、光学素子を収納する筐体を備え、該光学素子は、該筐体の側壁に設けられた貫通穴を通じて該筐体内に導入された光ファイバと光学的に結合しており、該筐体の外部では、該貫通穴から導出された光ファイバを保護する保護部材が該光ファイバの一部に配置されると共に、該筐体と一体化しているファイバ固定部により、該保護部材を介して該光ファイバを保持する光学素子モジュールにおいて、該貫通穴の内部では、光ファイバの被覆が除去されたベアファイバ部と該側壁との隙間が金属材料で封止固定されているため、側壁に形成する貫通穴の大きさも小さく、ファイバ固定部もファイバ被覆された光ファイバを保持するだけの役目であるため構造も単純化することが可能となる。しかも、封止作業も容易であり、特に、光ファイバと側壁との間で確実な封止を行うことができる。封止に際しては、半田作業に必要な時間も短縮でき、ファイバ被覆への熱ダメージも少ない。 According to the present invention, 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. 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. In 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. In addition, 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.
本発明の光学素子モジュールの一部を示す断面図である。It is sectional drawing which shows a part of optical element module of this invention. 本発明の光学素子モジュールに使用されるファイバ固定部の一例を示す図である。It is a figure which shows an example of the fiber fixing | fixed part used for the optical element module of this invention.
　以下、本発明を好適例を用いて詳細に説明する。
　図１は、本発明の光学素子モジュールの実施例を示す。
　本発明は、光学素子を収納する筐体を備え、該光学素子は、該筐体の側壁に設けられた貫通穴を通じて該筐体内に導入された光ファイバと光学的に結合しており、該筐体の外部では、該貫通穴から導出された光ファイバを保護する保護部材が該光ファイバの一部に配置されると共に、該筐体と一体化しているファイバ固定部により、該保護部材を介して該光ファイバを保持する光学素子モジュールにおいて、該貫通穴の内部では、光ファイバの被覆が除去されたベアファイバ部と該側壁との隙間が金属材料で封止固定されていることを特徴とする。 Hereinafter, the present invention will be described in detail using preferred examples.
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. In the optical element module that holds the optical fiber via, 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. And
　本発明における「ベアファイバ部」とは、コアとクラッドのみからなる光ファイバを意味し、該ベアファイバ部にＵＶコーティング等の薄い保護膜（一次被覆）を施した「光ファイバ素線」、さらに該光ファイバを覆う被覆層（二次被覆）にナイロン等の樹脂製保護膜を使用した「光ファイバ芯線」とは区別される。筺体の封止部以外の光ファイバの被覆状態については、メタライズ処理や封止処理に大きな影響を及ぼさない限りにおいて被覆があってもよい。ただし、該筺体の内部に挿入される部分の光ファイバの被覆状態に関しては、該筺体側壁の貫通穴の大きさにも依存するが、少なくとも二次被覆が除かれていることが作業効率上好ましい。 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. However, 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. .
　また、本発明における「光ファイバの被覆（ファイバ被覆）」とは、主に上記「一次被覆」を意味する。さらに、本発明における「保護部材」には、上記「二次被覆」や後述するような「ルースチューブ」が該当する。 Further, “optical fiber coating (fiber coating)” in the present invention mainly means the above “primary coating”. Further, the “protective member” in the present invention corresponds to the “secondary coating” and “loose tube” as described later.
　本発明の光学素子モジュールでは、筐体の側壁に貫通穴を設けると共に、該貫通穴に繋がるようにファイバ固定部が側壁に一体加工されている、あるいは溶接又は半田固定等で接合されている。後述するように、光ファイバ（ベアファイバ部）は側壁に設けられた貫通穴内で封止固定されるため、多くの部品が筐体と一体化され、特許文献１乃至３に示すように、側壁を貫通して配置するパイプなどの部品が不要となり、サイズを小型化できると共に、部品点数の削減も行うことが可能となる。 In the optical element module of the present invention, 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. As will be described later, since the optical fiber (bare fiber portion) is sealed and fixed in a through hole provided in the side wall, many parts are integrated with the housing, and as shown in Patent Documents 1 to 3, 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.
　図２に、筐体側壁に接合されたファイバ固定部の形状を示す。図２（ａ）は上側から見た図であり、図２（ｂ）は、図２（ａ）における点線Ａ－Ａにおける断面図を示す。ファイバ固定部は円筒等の筒状体であり、外周の一部に光ファイバを挿入し易いようにスリットが形成されている。 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, and 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.
　ファイバ固定部の筐体に接合される側は、内部の内径が図１に示すようなテーパ形状となっており、側壁の貫通穴に繋がる開口が形成されている。テーパ形状の傾斜を設けることで、該ファイバ被覆が除去されたベアファイバ部（筐体内に挿入される部分には、封止を妨げない範囲で被覆が残っていても良い）を挿入する際に、ファイバ固定部から側壁の貫通穴、さらには筐体内部に、円滑に光ファイバを挿入でき、作業性が向上するばかりか、光ファイバの押し込み具合や撓み量を容易に調整することが可能となる。 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. When inserting a bare fiber part (the part inserted into the housing may have a coating remaining within a range not hindering sealing) by providing a taper-shaped slope. In addition, 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.
　スリットの幅ｗは、被覆あるいは保護された（一次被覆又は二次被覆、あるいはルースチューブを備えた）光ファイバの幅よりも広くなるよう設定されていてもよい。これは、ファイバ被覆が除去されたベアファイバ部を貫通穴に挿入し、光ファイバの位置決めを行い、続いて封止作業を行い、最後に光ファイバをファイバ固定部に固定するまでの一連の作業を行い易いように設定されている。 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.
　次に、光ファイバを固定する手順について説明する。ファイバ被覆が除去されたベアファイバ部をファイバ固定部から挿入し、光ファイバの先端を光学素子に突き合わせ接続（バットジョイント）等で接続する。図１では、光学素子として、光変調器などのような光導波路が形成された光学素子を例示しているが、本発明の光学素子はこれに限定されない。 Next, the procedure for fixing the optical fiber will be described. 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. In 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.
　筐体の側壁に設けられた貫通穴内で、光ファイバは封止固定される。封止固定部近辺ではファイバ被覆は除去され、封止性を保つため、光ファイバのガラス部分に蒸着やメッキで金属膜、例えばＡｕなどがＣｒ等の下地金属を介して成膜されている（メタライズ処理）。また、金属膜のほかにガラス用の特殊金属半田等で予半田しておいても良い。該筺体の封止部以外の光ファイバの被覆状態については、メタライズ処理や封止処理に大きな影響を及ぼさない限りにおいて被覆があってもよい。ただし、該筺体の内部に挿入される部分の光ファイバの被覆状態に関しては、該筺体側壁の貫通穴の大きさにも依存するが、少なくとも二次被覆が除かれていることが作業効率上好ましい。 The optical fiber is sealed and fixed in the through hole provided in the side wall of the housing. In the vicinity of the sealing fixing portion, 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). In addition to the metal film, it may be pre-soldered with a special metal solder for glass. As for 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. However, 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. .
　封止部には、ファイバ固定部に設けた作業穴やスリットから半田ペースト等を注入し、ファイバ固定部の筐体側に形成された凹部に半田ごてなどを当接し局部加熱すること、あるいは誘導加熱手段などで半田ペースト等を溶融し、Ａｕなどの金属がメッキされた筐体（貫通穴内壁）と光ファイバ間で気密封止される。 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.
　該ファイバ被覆が除去されたベアファイバ部の直径はシングルモードファイバであれば、０．１２５ｍｍ程度のため、貫通穴の内径を０．３ｍｍ～０．９ｍｍ程度とすることで、半田溶融時に毛細管現象で、均一に効率良く筐体側壁内部に半田固定することができる。 If 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.
　また、貫通穴の内径を、ファイバ被覆が除去されたベアファイバ部の外径より大きく、光ファイバを保護する保護部材（二次被覆やルースチューブ等）の外径以下に設定することで、最初の光ファイバを貫通穴に通す際に、保護部材まで筐体内に挿入することが抑制され、作業効率が高くなる。 Also, by setting the inner diameter of the through hole to be 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, When the optical fiber is passed through the through hole, the insertion of the protective member into the housing is suppressed, and the working efficiency is increased.
　また、貫通穴の位置や内径の大きさは、光ファイバを貫通穴に挿入し、光学素子に該光ファイバを突き合わせ接続する際に、当該接続部での光ファイバの光軸が、該貫通穴の内径の範囲内にあるように設定することで、より作業効率を高めることが可能となる。つまり、貫通穴に光ファイバが接触し、光学素子との調芯・固定作業時に光ファイバを破損させないように、光学素子と接続される光軸の延長線上に貫通穴を設ける。光軸の延長が、貫通穴の直径の範囲となるように位置を設定することで、作業性が良く、また封止固定後も光ファイバに異常な応力や曲げが発生することを防止することができる。 Further, 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. By setting so as to be within the range of the inner diameter, it is possible to further improve the working efficiency. That is, 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. By setting the position so that the extension of the optical axis is in the range of the diameter of the through hole, workability is good, and it is possible to prevent abnormal stress and bending from occurring in the optical fiber even after sealing and fixing Can do.
　さらに、貫通穴は、側壁に対して傾斜させていることで、光学素子と光ファイバとがスネル角を保って接続するのを補助することができる。また、光学素子と光ファイバとが一直線上に無い場合には、このような構成により両者の接続部に余分な応力が加わるのを抑制することもできる。 Furthermore, 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. In addition, when 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.
　封止を行った後は、ファイバ被覆や保護部材を備えた光ファイバをファイバ固定部の内部に収め、ファイバ固定補助部材でファイバ固定部の開口端部を塞ぐ。そして、スリットや作業穴から接着剤を流し込み、少なくともファイバ被覆された光ファイバとファイバ固定部とを固着させる。ファイバ固定部のスリットや作業穴に流し込まれる接着剤は、ファイバ被覆が除去されたベアファイバ部、ファイバ被覆された光ファイバ両方が固定される程度の量であるとよい。 After sealing, 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.
　ファイバ固定部の内部に収められるファイバ被覆された光ファイバに関しては、さらにルースチューブなどの保護部材があっても良い。ルースチューブなどの保護部材がある場合はこれらも接着剤によりファイバ固定部と固着されることが望ましい。 For the fiber-coated optical fiber housed inside the fiber fixing part, there may be a protective member such as a loose tube. When there is a protective member such as a loose tube, it is desirable that these are also fixed to the fiber fixing portion with an adhesive.
　ファイバ固定部の内径は、ファイバ固定部の内部に収められるファイバ被覆された光ファイバの外径（あるいは保護部材の外径）より０．３～２ｍｍ程度大きいことが望ましい。ファイバ固定部の内径が小さすぎると粘性が高い接着剤を使用した場合に接着剤の流入に支障をきたし、ファイバ被覆された光ファイバ（あるいは保護部材）とファイバ固定部の固着強度に影響を及ぼす。ファイバ固定部の内径が大き過ぎると固着に多量の接着剤を要する。 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.
　図１では、ファイバ固定部は、筐体の側壁に対して斜め方向（垂直でない）に接続されていたが、側壁に垂直に接続することも可能である。その場合は、貫通穴について側壁に垂直に形成し、光学素子とファイバ接続部の光軸の延長が貫通穴の直径内にすることで、光ファイバに無理な力が掛り、損失の増加や応力による破損を防ぐことができる。 In FIG. 1, 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. In that case, by forming the through hole perpendicular to the side wall and extending the optical axis of the optical element and the fiber connection part within the diameter of the through hole, an excessive force is applied to the optical fiber, increasing the loss and stress. Damage due to can be prevented.
　ファイバ固定部の形状としては、円筒形状に限らず角型等の形状であっても良い。また、ファイバ固定部の筐体側の部分を肉薄構造とし、半田への熱伝導を良くし、加熱時間を短縮することもできる。これによりファイバ被覆へのダメージも抑制できる。 The shape of the fiber fixing portion is not limited to a cylindrical shape, and may be a square shape or the like. In addition, 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.
　以上のように、本発明に係る光学素子モジュールによれば、小型で低コストな構造を備え、封止作業での作業効率が向上すると共に、ファイバ被覆への熱ダメージも少ない光学素子モジュールを提供することが可能となる。 As described above, according to the optical element module of the present invention, there is provided 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.

Claims (5)

  1. 　光学素子を収納する筐体を備え、
    　該光学素子は、該筐体の側壁に設けられた貫通穴を通じて該筐体内に導入された光ファイバと光学的に結合しており、
    　該筐体の外部では、該貫通穴から導出された光ファイバを保護する保護部材が該光ファイバの一部に配置されると共に、該筐体と一体化しているファイバ固定部により、該保護部材を介して該光ファイバを保持する光学素子モジュールにおいて、
    　該貫通穴の内部では、光ファイバの被覆が除去されたベアファイバ部と該側壁との隙間が金属材料で封止固定されていることを特徴とする光学素子モジュール。     A housing for storing optical elements is provided.
    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 casing, a protective member for protecting the optical fiber led out from the through hole is disposed in a part of the optical fiber, and the protective member is provided by a fiber fixing portion integrated with the casing. In an optical element module that holds the optical fiber via
    Inside the through hole, 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.
  2. 　請求項１に記載の光学素子モジュールにおいて、該貫通穴の内径は、０．３ｍｍ～０．９ｍｍであることを特徴とする光学素子モジュール。 2. The optical element module according to claim 1, wherein the through hole has an inner diameter of 0.3 mm to 0.9 mm.
  3. 　請求項１又は２に記載の光学素子モジュールにおいて、該貫通穴の内径は、該ファイバ被覆が除去されたベアファイバ部の外径より大きく、該保護部材の外径以下に設定されていることを特徴とする光学素子モジュール。 3. The optical element module according to claim 1, wherein an inner diameter of the through hole is set to be larger than an outer diameter of the bare fiber portion from which the fiber coating is removed and equal to or smaller than the outer diameter of the protective member. An optical element module.
  4. 　請求項１乃至３のいずれかに記載の光学素子モジュールにおいて、該光学素子に該光ファイバが突き合わせ接続されており、当該接続部での光ファイバの光軸が、該貫通穴の内径の範囲内にあることを特徴とする光学素子モジュール。 4. The optical element module according to claim 1, wherein the optical fiber is butt-connected to the optical element, and the optical axis of the optical fiber at the connection portion is within the range of the inner diameter of the through hole. And an optical element module.
  5. 　請求項１乃至４のいずれかに記載の光学素子モジュールにおいて、該貫通穴は、該側壁に対して傾斜していることを特徴とする光学素子モジュール。 5. The optical element module according to claim 1, wherein the through hole is inclined with respect to the side wall.
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JP6649843B2 (en) 2016-05-13 2020-02-19 Ｎｔｔエレクトロニクス株式会社 Optical circuit
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