JP2020021088A - Optical fiber coupler - Google Patents

Optical fiber coupler Download PDF

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JP2020021088A
JP2020021088A JP2019182389A JP2019182389A JP2020021088A JP 2020021088 A JP2020021088 A JP 2020021088A JP 2019182389 A JP2019182389 A JP 2019182389A JP 2019182389 A JP2019182389 A JP 2019182389A JP 2020021088 A JP2020021088 A JP 2020021088A
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optical fiber
coupler
adhesive
groove
fiber coupler
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JP7308120B2 (en
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雅人 ▲高▼屋
雅人 ▲高▼屋
Masato Takaya
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Tatsuta Electric Wire and Cable Co Ltd
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Tatsuta Electric Wire and Cable Co Ltd
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Priority claimed from JP2017111880A external-priority patent/JP6646621B2/en
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Priority to JP2022054306A priority patent/JP2022084892A/en
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Abstract

To provide an optical fiber coupler capable of suppressing variations in a polarization state of light passing through a coupler part.SOLUTION: An optical fiber coupler 1 comprises a substrate 2 with a groove 2a, a coupler part 13 in which a plurality of optical fibers 11 and 12 are inserted into the groove and respective midway portions thereof are joined together, and adhesives 3 disposed inside the groove. The optical fibers each have a glass part and a coating part for covering the glass part. Both ends of the coupler part are fixed in the groove with the adhesives. The adhesives each cover a whole periphery of the coating part and the glass part, and a Shore D hardness of the adhesives is 10 to 35. The plurality of optical fibers are of a single-mode optical fiber.SELECTED DRAWING: Figure 1

Description

本発明は、複数の光ファイバ間において、光の分離及び結合を行う光ファイバカプラに関する。   The present invention relates to an optical fiber coupler for separating and coupling light between a plurality of optical fibers.

一般に、光ファイバカプラを製造する場合、複数の光ファイバそれぞれの中途部を加熱し、光ファイバのクラッドを溶融させ、各中途部を延伸接合させてカプラ部を形成する。カプラ部は、例えば基板の溝に挿入され、接着剤によって溝の内側に固定される（例えば特許文献１参照）。   Generally, when an optical fiber coupler is manufactured, a halfway portion of each of a plurality of optical fibers is heated, a clad of the optical fiber is melted, and each halfway portion is stretch-bonded to form a coupler portion. The coupler portion is inserted into, for example, a groove of the substrate, and is fixed inside the groove by an adhesive (for example, see Patent Document 1).

特許文献１によれば、５Ｍｐａ以上の引張剪断接着強度を有する接着剤を使用した場合、光ファイバカプラを通過する光の挿入損失の変動量を抑制することができる。     According to Patent Document 1, when an adhesive having a tensile shear adhesive strength of 5 Mpa or more is used, the amount of change in insertion loss of light passing through the optical fiber coupler can be suppressed.

特開２００５−１８１８９９号公報JP 2005-181899 A

しかし、前記光ファイバカプラは、光の挿入損失の変動量以外の要素を考慮していない。   However, the optical fiber coupler does not take into account factors other than the amount of change in the insertion loss of light.

本発明に係る光ファイバカプラは斯かる事情に鑑みてなされたものであり、その目的は、カプラ部を通過する光における偏光状態の変動を抑制させることにある。   An optical fiber coupler according to the present invention has been made in view of such circumstances, and an object thereof is to suppress a change in a polarization state of light passing through a coupler unit.

本発明に係る光ファイバカプラは、溝を有する基板と、前記溝に挿入され、複数の光ファイバそれぞれの中途部を接合させたカプラ部と、前記溝の内側に配置された接着剤とを備える光ファイバカプラであって、前記光ファイバは、ガラス部と、該ガラス部を覆う被覆部とを有し、前記被覆部を除去した各光ファイバのガラス部を接合させることによって前記カプラ部は構成されており、前記カプラ部の両端は前記接着剤によって前記溝に固定され、前記接着剤は、前記溝の内側にて、周方向における前記ガラス部及び被覆部の全体を覆い、前記接着剤のショアＤ硬度は１０〜３５であり、前記複数の光ファイバはシングルモード光ファイバである。
本発明に係る光ファイバカプラにおいては、前記接着剤が接着する複数の光ファイバのガラス部は前記カプラ部よりも太い。 An optical fiber coupler according to the present invention includes a substrate having a groove, a coupler part inserted into the groove, and joining a middle part of each of the plurality of optical fibers, and an adhesive disposed inside the groove. An optical fiber coupler, wherein the optical fiber has a glass portion and a coating portion that covers the glass portion, and the coupler portion is configured by joining the glass portions of the optical fibers from which the coating portion has been removed. Both ends of the coupler portion are fixed to the groove by the adhesive, the adhesive covers the entirety of the glass portion and the coating portion in the circumferential direction inside the groove, the adhesive of the adhesive The Shore D hardness is 10 to 35, and the plurality of optical fibers are single mode optical fibers.
In the optical fiber coupler according to the present invention, the glass parts of the plurality of optical fibers to which the adhesive is bonded are thicker than the coupler parts.

本発明に係る光ファイバカプラにおいては、前記接着剤の粘度は、５０００〜１５０００ｍＰａ・ｓである。   In the optical fiber coupler according to the present invention, the viscosity of the adhesive is 5,000 to 15000 mPa · s.

本発明に係る光ファイバカプラにおいては、前記カプラ部を通過した光の方位角を経時的に測定した場合、５〜７５℃の温度変化に対する前記方位角の変動幅の絶対値は１０度以下である。   In the optical fiber coupler according to the present invention, when the azimuth of the light passing through the coupler unit is measured over time, the absolute value of the azimuth fluctuation range with respect to a temperature change of 5 to 75 ° C. is 10 degrees or less. is there.

本発明に係る光ファイバカプラにあっては、接着剤のショアＤ硬度を１０〜３５に設定することによって、カプラ部を通過する光の偏光状態の変動を抑制させることができる。   In the optical fiber coupler according to the present invention, by setting the Shore D hardness of the adhesive to 10 to 35, it is possible to suppress a change in the polarization state of light passing through the coupler.

光ファイバカプラを略示する断面図である。FIG. 2 is a sectional view schematically showing an optical fiber coupler. 基板及びカプラ部を略示する平面図である。It is a top view which shows a board | substrate and a coupler part schematically. 図１に示すＩＩＩ−ＩＩＩ線を切断線とした略示断面図である。FIG. 3 is a schematic sectional view taken along line III-III shown in FIG. 1. 偏光状態の温度依存性を測定する構成を略示するブロック図である。FIG. 3 is a block diagram schematically illustrating a configuration for measuring the temperature dependence of the polarization state. 楕円偏光した光がＺ方向に進行する場合におけるＸＹ面に投影された電場ベクトルの軌跡を略示する図である。FIG. 4 is a diagram schematically illustrating a locus of an electric field vector projected on an XY plane when elliptically polarized light travels in a Z direction. 偏光測定器によって経時的に測定された方位角θを示すグラフである。It is a graph which shows the azimuth angle (theta) measured with time by the polarimeter. 偏光測定器によって経時的に測定された楕円率角ηを示すグラフである。It is a graph which shows the ellipticity angle (eta) measured with time by the polarimeter. 測定開始時点の値を基準にした方位角θの変動値Δθを示すグラフである。9 is a graph showing a variation value Δθ of the azimuth angle θ based on a value at the start of measurement. 測定開始時点の値を基準にした楕円率角ηの変動値Δηを示すグラフである。9 is a graph showing a fluctuation value Δη of an ellipticity angle η based on a value at the start of measurement.

以下実施の形態に係る光ファイバカプラ１を図面に基づいて説明する。図１は、光ファイバカプラ１を略示する断面図、図２は、基板２及びカプラ部１３を略示する平面図、図３は、図１に示すＩＩＩ−ＩＩＩ線を切断線とした略示断面図である。   Hereinafter, an optical fiber coupler 1 according to an embodiment will be described with reference to the drawings. 1 is a cross-sectional view schematically illustrating the optical fiber coupler 1, FIG. 2 is a plan view schematically illustrating the substrate 2 and the coupler unit 13, and FIG. 3 is a cross-sectional view taken along line III-III illustrated in FIG. FIG.

光ファイバカプラ１は円柱状の基板２を備える。基板２の材質は、石英、インバー、コバール等が使用でき、本実施例では石英を使用している。基板２には、長手方向に沿った溝２ａが形成されている。溝２ａにはカプラ部１３が挿入されている。カプラ部１３は第１光ファイバ１１及び第２光ファイバ１２によって構成されている。第１光ファイバ１１はコア１１ａと、該コア１１ａの周囲を覆うクラッド１１ｂと、該クラッド１１ｂの周囲を覆う被覆部１１ｃとを有する。第２光ファイバ１２はコア１２ａと、該コア１２ａの周囲を覆うクラッド１２ｂと、該クラッド１２ｂの周囲を覆う被覆部１２ｃとを有する。第１光ファイバ１１及び第２光ファイバ１２の被覆部１１ｃ、１２ｃを除去した後、各クラッド１１ｂ、１２ｂをアルコール等で洗浄し、その後、第１光ファイバ１１及び第２光ファイバ１２それぞれの中途部を加熱し、第１光ファイバ１１及び第２光ファイバ１２のクラッド１１ｂ、１２ｂを溶融させ、各中途部を延伸接合させることによって、カプラ部１３は形成されている。なおカプラ部１３は三つ以上の光ファイバによって構成されていてもよい。   The optical fiber coupler 1 includes a columnar substrate 2. As the material of the substrate 2, quartz, invar, kovar, or the like can be used. In this embodiment, quartz is used. A groove 2a is formed in the substrate 2 along the longitudinal direction. A coupler 13 is inserted into the groove 2a. The coupler unit 13 includes a first optical fiber 11 and a second optical fiber 12. The first optical fiber 11 has a core 11a, a cladding 11b covering the periphery of the core 11a, and a covering portion 11c covering the periphery of the cladding 11b. The second optical fiber 12 has a core 12a, a cladding 12b covering the periphery of the core 12a, and a covering portion 12c covering the periphery of the cladding 12b. After removing the coating portions 11c and 12c of the first optical fiber 11 and the second optical fiber 12, the claddings 11b and 12b are washed with alcohol or the like, and then the first optical fiber 11 and the second optical fiber 12 are respectively disposed halfway. The coupler section 13 is formed by heating the sections, melting the claddings 11b and 12b of the first optical fiber 11 and the second optical fiber 12, and extending and joining the respective intermediate sections. Note that the coupler unit 13 may be configured by three or more optical fibers.

カプラ部１３において、第１光ファイバ１１を通過する光量と、第２光ファイバ１２を通過する光量との比率（分岐比）が所定比率になる。例えば、分岐比が５０：５０に設定されている場合、第１光ファイバ１１に導入された光の光量の５０％は、カプラ部１３にて第２光ファイバ１２に移動する。   In the coupler section 13, the ratio (branch ratio) between the amount of light passing through the first optical fiber 11 and the amount of light passing through the second optical fiber 12 becomes a predetermined ratio. For example, when the branching ratio is set to 50:50, 50% of the amount of light introduced into the first optical fiber 11 moves to the second optical fiber 12 by the coupler unit 13.

溝２ａの二箇所に接着剤３がそれぞれ設けられている。接着剤３は、例えば可視光硬化型樹脂材又は紫外線硬化型樹脂材を含み、エポキシ系樹脂材又はアクリレート系樹脂材を含む。接着剤３は溝２ａの両端部に配されている。   Adhesives 3 are provided at two places of the groove 2a. The adhesive 3 includes, for example, a visible light curable resin material or an ultraviolet curable resin material, and includes an epoxy resin material or an acrylate resin material. The adhesive 3 is provided on both ends of the groove 2a.

硬化後の接着剤３のショアＤ硬度は、例えば１０〜３５であり、好ましくは１５〜３５である。ショアＤ硬度が１０未満の場合、環境温度が上昇した場合に接着剤３が柔らかくなり過ぎて、カプラ部１３が変形しやすくなる。ショアＤ硬度が３５を超過する場合、カプラ部１３の一部に応力が集中し易くなり、カプラ部１３に歪みが生じやすい。カプラ部１３に歪みが生じた場合、カプラ部１３を通過する光の偏光状態が変動し易くなる。   The Shore D hardness of the cured adhesive 3 is, for example, 10 to 35, and preferably 15 to 35. If the Shore D hardness is less than 10, the adhesive 3 becomes too soft when the environmental temperature rises, and the coupler portion 13 is easily deformed. When the Shore D hardness exceeds 35, stress tends to concentrate on a part of the coupler portion 13 and distortion is likely to occur in the coupler portion 13. When distortion occurs in the coupler unit 13, the polarization state of light passing through the coupler unit 13 tends to change.

硬化前の接着剤３の粘度は、例えば、５０００〜１５０００ｍＰａ・ｓである。粘度が５０００ｍＰａ・ｓよりも小さい場合、毛細管現象によって接着剤３が溝２ａ内に拡がり過ぎ、接着剤３がカプラ部１３に付着する面積が過大になる。一方、粘度が１５０００ｍＰａ・ｓよりも大きい場合、接着剤３が硬過ぎて溝２ａ内のカプラ部１３に塗布しにくい。   The viscosity of the adhesive 3 before curing is, for example, 5000 to 15000 mPa · s. If the viscosity is less than 5000 mPa · s, the adhesive 3 spreads too much into the groove 2 a due to the capillary phenomenon, and the area where the adhesive 3 adheres to the coupler portion 13 becomes excessive. On the other hand, when the viscosity is larger than 15000 mPa · s, the adhesive 3 is too hard to be applied to the coupler portion 13 in the groove 2a.

カプラ部１３の両端付近、換言すれば、カプラ部１３が第１光ファイバ１１及び第２光ファイバ１２に分岐する部分は、溝２ａの両端部に配置されている。前述したように、溝２ａの両端部に、接着剤３がそれぞれ設けられている。接着剤３は、第１光ファイバ１１及び第２光ファイバ１２の被覆部１１ｃ、１２ｃと、被覆部１１ｃ、１２ｃを除去した第１光ファイバ１１及び第２光ファイバ１２のガラス部（カプラ部１３の両端付近であって第１光ファイバ１１及び第２光ファイバ１２が細くなっていないクラッド１１ｂ、１２ｂ及びコア１１ａ、１２ａ）とを溝２ａに固定している。   The portions near both ends of the coupler section 13, in other words, portions where the coupler section 13 branches into the first optical fiber 11 and the second optical fiber 12 are arranged at both ends of the groove 2a. As described above, the adhesive 3 is provided at each end of the groove 2a. The adhesive 3 covers the coating portions 11c and 12c of the first optical fiber 11 and the second optical fiber 12, and the glass portions (coupler portions 13) of the first and second optical fibers 11 and 12 from which the coating portions 11c and 12c are removed. And the claddings 11b and 12b and the cores 11a and 12a) near the both ends and where the first optical fiber 11 and the second optical fiber 12 are not thin, are fixed to the groove 2a.

カプラ部１３及び基板２は、金属部材によって構成された保護筒５に収納され、接着剤によって保護筒５に固定されている。保護筒５の材質は、ＳＵＳ、インバー、コバール等が使用できるが、実施例ではＳＵＳを使用している。保護筒５の両端部は封止部６によって封止されている。封止部６は、例えばシリコーン樹脂材を含む。第１光ファイバ１１及び第２光ファイバ１２は封止部６を貫通し、外向きに突出している。   The coupler unit 13 and the substrate 2 are housed in a protective cylinder 5 made of a metal member, and are fixed to the protective cylinder 5 with an adhesive. SUS, Invar, Kovar, or the like can be used as the material of the protective cylinder 5, but SUS is used in the embodiment. Both ends of the protective cylinder 5 are sealed by a sealing portion 6. The sealing portion 6 includes, for example, a silicone resin material. The first optical fiber 11 and the second optical fiber 12 penetrate the sealing portion 6 and protrude outward.

硬化後の接着剤３のショアＤ硬度を３５以下に設定することによって、カプラ部１３を通過する光の温度変化に対する偏光状態の変動を抑制させることができる。図４は、偏光状態の温度依存性を測定する構成を略示するブロック図である。   By setting the Shore D hardness of the adhesive 3 after curing to 35 or less, it is possible to suppress the change in the polarization state with respect to the temperature change of the light passing through the coupler unit 13. FIG. 4 is a block diagram schematically illustrating a configuration for measuring the temperature dependence of the polarization state.

光ファイバカプラ１は加熱／冷却装置２０に設けられている。加熱／冷却装置２０はペルチェ素子を備える。第１光ファイバ１１の一端部に光源２１が取り付けられており、他端部にパワーメータ２２が取り付けられている。パワーメータ２２は、カプラ部１３を通過した第１光ファイバ１１における光量を測定する。パワーメータ２２によって温度変化に対する光の挿入損失を測定することができる。   The optical fiber coupler 1 is provided in a heating / cooling device 20. The heating / cooling device 20 includes a Peltier device. A light source 21 is attached to one end of the first optical fiber 11, and a power meter 22 is attached to the other end. The power meter 22 measures the amount of light in the first optical fiber 11 that has passed through the coupler unit 13. The power meter 22 can measure the light insertion loss with respect to the temperature change.

第２光ファイバ１２の一端部には何も取り付けられておらず、他端部には偏光測定器２３が取り付けられている。偏光測定器２３は、Ｔｈｏｒｌａｂｓ社製の自由空間型偏光計「ＰＡＸ５７１０シリーズ」を用いることができ、実施例では、「ＰＡＮ５７１０ＩＲ−Ｔ」を用いた。偏光測定器２３によって、カプラ部１３を通過した光の温度変化に対する偏光状態の変動を測定することができる。   Nothing is attached to one end of the second optical fiber 12, and a polarimeter 23 is attached to the other end. As the polarimeter 23, a free space polarimeter “PAX5710 series” manufactured by Thorlabs can be used, and in the examples, “PAN5710IR-T” was used. The polarization measuring device 23 can measure a change in the polarization state of the light passing through the coupler section 13 with respect to a temperature change.

図５は、楕円偏光した光がＺ方向に進行する場合におけるＸＹ面に投影された電場ベクトルの軌跡を略示する図である。図５において、Ｘ軸及びＹ軸は直交する。Ｚ軸は、Ｘ軸及びＹ軸に直交し、紙面に垂直な方向に延びる。カプラ部１３を通過した光は楕円偏光して進行する。光がＺ軸方向に進行する場合、図５に示すように、ＸＹ面に投影された電場ベクトルの軌跡は楕円３０になる。なお楕円３０の長軸３１とＸ軸とのなす角度、即ち方位角をθとする。楕円３０と長軸３１との交点及び楕円３０と短軸３２との交点を結ぶ線分３３と、長軸３１とのなす角度、即ち楕円率角をηとする。   FIG. 5 is a diagram schematically illustrating the locus of the electric field vector projected on the XY plane when the elliptically polarized light travels in the Z direction. In FIG. 5, the X axis and the Y axis are orthogonal. The Z axis is orthogonal to the X axis and the Y axis and extends in a direction perpendicular to the plane of the drawing. The light that has passed through the coupler unit 13 travels as elliptically polarized light. When the light travels in the Z-axis direction, the locus of the electric field vector projected on the XY plane becomes an ellipse 30, as shown in FIG. Note that the angle between the major axis 31 of the ellipse 30 and the X axis, that is, the azimuth angle is θ. The angle between the major axis 31 and the line segment 33 connecting the intersection of the ellipse 30 and the major axis 31 and the intersection of the ellipse 30 and the minor axis 32, that is, the ellipticity angle is η.

図６は、偏光測定器２３によって経時的に測定された方位角θを示すグラフ、図７は、偏光測定器２３によって経時的に測定された楕円率角ηを示すグラフである。図６及び図７において、グラフ５０は、ショアＤ硬度９０の接着剤３を使用した光ファイバカプラ１に対する測定結果を示す。グラフ５１は、ショアＤ硬度２０の接着剤３を使用した光ファイバカプラ１に対する測定結果を示す。グラフ５２及び５３は、ショアＤ硬度３２の接着剤３を使用した光ファイバカプラ１に対する測定結果を示す。   FIG. 6 is a graph showing the azimuth angle θ measured over time by the polarimeter 23, and FIG. 7 is a graph showing the ellipticity angle η measured over time by the polarimeter 23. 6 and 7, a graph 50 shows a measurement result for the optical fiber coupler 1 using the adhesive 3 having a Shore D hardness of 90. A graph 51 shows a measurement result for the optical fiber coupler 1 using the adhesive 3 having a Shore D hardness of 20. Graphs 52 and 53 show measurement results for the optical fiber coupler 1 using the adhesive 3 having a Shore D hardness of 32.

測定開始時点の温度は２５℃である。測定開始後、２５秒経過した時、加熱／冷却装置２０の温度を５℃に変更し、３００秒経過した時、加熱／冷却装置２０の温度を７５℃に変更し、５００秒経過した時、加熱／冷却装置２０の温度を２５℃に変更する。   The temperature at the start of the measurement is 25 ° C. When 25 seconds have elapsed since the start of the measurement, the temperature of the heating / cooling device 20 was changed to 5 ° C., when 300 seconds passed, the temperature of the heating / cooling device 20 was changed to 75 ° C., and when 500 seconds passed, The temperature of the heating / cooling device 20 is changed to 25 ° C.

図６及び図７のグラフ５０に示すように、ショアＤ硬度９０の接着剤３を使用した場合、温度変更後、方位角θ及び楕円率角ηは大きく変動する。一方、グラフ５１〜５３に示すように、ショアＤ硬度２０又は３２の接着剤３を使用した場合、温度変更後でも方位角θ及び楕円率角ηはほとんど変動しない。   As shown in the graphs 50 of FIGS. 6 and 7, when the adhesive 3 having a Shore D hardness of 90 is used, the azimuth angle θ and the ellipticity angle η greatly change after the temperature is changed. On the other hand, as shown in the graphs 51 to 53, when the adhesive 3 having a Shore D hardness of 20 or 32 is used, the azimuth angle θ and the ellipticity angle η hardly change even after the temperature is changed.

グラフ５１〜５３における方位角θ及び楕円率角ηの変動幅について説明する。図８は、測定開始時点の値を基準にした方位角θの変動値Δθを示すグラフである。図８のグラフ５１に示すように、ショアＤ硬度２０の接着剤３を使用した場合、変動値Δθは、±１度の範囲内に存在する。図８のグラフ５２及び５３に示すように、変動値Δθは、−２〜＋３度の範囲内に存在する。   The variation range of the azimuth angle θ and the ellipticity angle η in the graphs 51 to 53 will be described. FIG. 8 is a graph showing a variation value Δθ of the azimuth angle θ based on the value at the start of the measurement. As shown in the graph 51 of FIG. 8, when the adhesive 3 having a Shore D hardness of 20 is used, the variation value Δθ exists in a range of ± 1 degree. As shown in the graphs 52 and 53 of FIG. 8, the variation value Δθ exists in the range of −2 to +3 degrees.

図９は、測定開始時点の値を基準にした楕円率角ηの変動値Δηを示すグラフである。図９のグラフ５１に示すように、ショアＤ硬度２０の接着剤３を使用した場合、変動値Δηは、−４〜２度の範囲内に存在する。図９のグラフ５２及び５３に示すように、変動値Δηは、±４度の範囲内に存在する。   FIG. 9 is a graph showing a variation value Δη of the ellipticity angle η based on the value at the start of the measurement. As shown in the graph 51 of FIG. 9, when the adhesive 3 having a Shore D hardness of 20 is used, the variation value Δη exists in the range of −4 to 2 degrees. As shown in the graphs 52 and 53 of FIG. 9, the fluctuation value Δη exists within a range of ± 4 degrees.

このように、ショアＤ硬度３５以下の接着剤３を使用した場合、方位角θ及び楕円率角ηはほとんど変動しない。即ち、カプラ部１３を通過する光における温度変化に対する偏光状態の変動を抑制することができる。   As described above, when the adhesive 3 having a Shore D hardness of 35 or less is used, the azimuth angle θ and the ellipticity angle η hardly change. That is, it is possible to suppress a change in the polarization state of the light passing through the coupler unit 13 with respect to a temperature change.

また接着剤３の粘度を５０００〜１５０００ｍＰａ・ｓに設定することによって、カプラ部１３の不要な箇所に接着剤３が付着することを防止し、また溝２ａ内のカプラ部１３に接着剤３を円滑に塗布することができる。そのため、光ファイバカプラ１の製造作業を円滑に実行することができる。   Further, by setting the viscosity of the adhesive 3 to 5000 to 15000 mPa · s, the adhesive 3 is prevented from adhering to unnecessary portions of the coupler portion 13, and the adhesive 3 is applied to the coupler portion 13 in the groove 2 a. It can be applied smoothly. Therefore, the manufacturing operation of the optical fiber coupler 1 can be performed smoothly.

また、光ファイバカプラ１の特性として、方位角θ及び楕円率角ηの変動幅の絶対値は１０度以下に収まることが望ましく、好ましくは５度以下に収まることが望ましい。上述したように、方位角θの変動幅の絶対値は３度以下に収まっており、楕円率角ηの変動幅の絶対値は４度以下に収まっている。   Further, as a characteristic of the optical fiber coupler 1, it is desirable that the absolute values of the variation widths of the azimuth angle θ and the ellipticity angle η are within 10 degrees or less, and preferably within 5 degrees. As described above, the absolute value of the fluctuation range of the azimuth angle θ is within 3 degrees, and the absolute value of the fluctuation range of the ellipticity angle η is within 4 degrees.

光ファイバカプラ１は、偏光特性の安定性が要求される光干渉計に用いることができ、例えば、ＯＣＴ（Ｏｐｔｉｃａｌ Ｃｏｈｅｒｅｎｃｅ Ｔｏｍｏｇｒａｐｈｙ）を利用した装置に使用される。一般的に、前記装置には偏波コントローラが設けられている。前記装置を使用する場合、前記装置が設置された環境の温度に応じて、偏波コントローラを操作し、偏光具合を調整する。偏波コントローラが手動で駆動される場合、ユーザの操作が必要であるが、ユーザが操作を失念することがある。従来、温度が大きく変わっているにも拘わらず、ユーザが偏波コントローラを操作せず、偏光具合を調整しなかった場合、光ファイバカプラ１の偏光状態が変わっているので、前記装置の使用に不具合が生じていた。   The optical fiber coupler 1 can be used for an optical interferometer that requires stability of polarization characteristics, and is used, for example, for an apparatus using OCT (Optical Coherence Tomography). Generally, the device is provided with a polarization controller. When the device is used, the polarization controller is operated to adjust the degree of polarization according to the temperature of the environment in which the device is installed. When the polarization controller is manually driven, user operation is required, but the user sometimes forgets the operation. Conventionally, when the user does not operate the polarization controller and does not adjust the degree of polarization despite the temperature has largely changed, the polarization state of the optical fiber coupler 1 has changed. There was a problem.

実施の形態に係る光ファイバカプラ１にあっては、温度変化に対する方位角θ及び楕円率角ηの変動幅の絶対値は１０度以下に収まるので、一度偏光の調整を行えば、温度変化により偏光が変化して再調整する必要がなく、ユーザの利便性を向上させることができる。   In the optical fiber coupler 1 according to the embodiment, since the absolute value of the variation width of the azimuth angle θ and the ellipticity angle η with respect to the temperature change falls within 10 degrees or less, once the polarization is adjusted, the temperature changes. It is not necessary to readjust the polarization and the convenience for the user can be improved.

５〜７５℃の範囲で温度を変化させても、方位角θ及び楕円率角ηの変動幅の絶対値は１０度以下に収まる。即ち、通常使用すると想定される環境温度において、偏光状態の変動を抑制することができる。   Even if the temperature is changed in the range of 5 to 75 ° C., the absolute value of the fluctuation range of the azimuth angle θ and the ellipticity angle η falls within 10 degrees or less. That is, the fluctuation of the polarization state can be suppressed at the environmental temperature assumed to be normally used.

本発明で使用される光ファイバとしては、波長帯が４４０〜２２００ｎｍの光をシングルモードで伝送するものが選択され、クラッド径１２５μｍ及び被覆径２５０μｍの光ファイバが選択されることが一般的である。実施の形態では、上記光ファイバの一例として、コーニング製のＨＩ７８０を使用した。   As the optical fiber used in the present invention, one that transmits light having a wavelength band of 440 to 2200 nm in a single mode is selected, and an optical fiber having a cladding diameter of 125 μm and a coating diameter of 250 μm is generally selected. . In the embodiment, HI780 manufactured by Corning was used as an example of the optical fiber.

今回開示した実施の形態は、全ての点で例示であって、制限的なものではないと考えられるべきである。各実施例にて記載されている技術的特徴は互いに組み合わせることができ、本発明の範囲は、特許請求の範囲内での全ての変更及び特許請求の範囲と均等の範囲が含まれることが意図される。   The embodiment disclosed this time is an example in all respects, and should be considered as not being restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all the modifications within the scope of the claims and the scope equivalent to the scope of the claims. Is done.

１ 光ファイバカプラ
２ 基板
２ａ 溝
３ 接着剤
１１ 第１光ファイバ
１２ 第２光ファイバ
１３ カプラ部 Reference Signs List 1 optical fiber coupler 2 substrate 2a groove 3 adhesive 11 first optical fiber 12 second optical fiber 13 coupler section

Claims (3)

溝を有する基板と、前記溝に挿入され、複数の光ファイバそれぞれの中途部を接合させたカプラ部と、前記溝の内側に配置された接着剤とを備える光ファイバカプラであって、
前記光ファイバは、ガラス部と、該ガラス部を覆う被覆部とを有し、
前記被覆部を除去した各光ファイバのガラス部を接合させることによって前記カプラ部は構成されており、
前記カプラ部の両端は前記接着剤によって前記溝に固定され、
前記接着剤は、前記溝の内側にて、周方向における前記ガラス部及び被覆部の全体を覆い、
前記接着剤のショアＤ硬度は１０〜３５であり、
前記複数の光ファイバはシングルモード光ファイバである
光ファイバカプラ。 A substrate having a groove, a coupler unit inserted into the groove, and joining a middle part of each of the plurality of optical fibers, and an optical fiber coupler including an adhesive disposed inside the groove,
The optical fiber has a glass portion and a covering portion that covers the glass portion,
The coupler portion is configured by joining the glass portion of each optical fiber after removing the coating portion,
Both ends of the coupler portion are fixed to the groove by the adhesive,
The adhesive covers the entirety of the glass portion and the covering portion in the circumferential direction inside the groove,
The Shore D hardness of the adhesive is 10 to 35,
An optical fiber coupler, wherein the plurality of optical fibers are single mode optical fibers. 前記接着剤が接着する前記複数の光ファイバのガラス部は前記カプラ部よりも太い
請求項１に記載の光ファイバカプラ。 The optical fiber coupler according to claim 1, wherein a glass part of the plurality of optical fibers to which the adhesive is bonded is thicker than the coupler part. 硬化前の前記接着剤の粘度は、５０００〜１５０００ｍＰａ・ｓである
請求項１又は２に記載の光ファイバカプラ。 The optical fiber coupler according to claim 1, wherein the viscosity of the adhesive before curing is 5,000 to 15000 mPa · s.
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