JPS59211010A - Polarizing plane matching method of polarizing plane maintaining optical fiber - Google Patents

Polarizing plane matching method of polarizing plane maintaining optical fiber

Info

Publication number
JPS59211010A
JPS59211010A JP58085336A JP8533683A JPS59211010A JP S59211010 A JPS59211010 A JP S59211010A JP 58085336 A JP58085336 A JP 58085336A JP 8533683 A JP8533683 A JP 8533683A JP S59211010 A JPS59211010 A JP S59211010A
Authority
JP
Japan
Prior art keywords
face
optical fiber
fiber
polarization
output light
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP58085336A
Other languages
Japanese (ja)
Inventor
Ippei Sato
一平 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP58085336A priority Critical patent/JPS59211010A/en
Publication of JPS59211010A publication Critical patent/JPS59211010A/en
Pending legal-status Critical Current

Links

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
    • G02B6/4216—Packages, e.g. shape, construction, internal or external details incorporating polarisation-maintaining 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To execute quickly and exactly matching of a polarizing plane with other optical device, etc., and to automate easily a work by detecting quickly and exactly a main axis direction of an end face of a polarizing plane maintaining fiber. CONSTITUTION:When for instance, a winding part, etc. of an optical fiber 11 are heated intermittently, an optical path length of the fiber 11 is increased or decreased, and a phase difference between two component modes of an output light from an output end face B is increased or decreased, by which generally, an output light intensity of an analyser 15a is varied. A fact that the output end face B is rotated against the analyser 15 and an intensity of the output light is not varied with regard to a phase difference between each component mode of the output light of the fiber 11 signifies that one of main axes of the end face B of the fiber 11 conforms with the polarizing plane of the analyser 15 and other main is in an orthogonal arrangement, and the main axis direction of one end face of the fiber is detected easily. When this detected end face is connected to an optical device by matching the polarizing plane, the other end face can be connected easily at an optional time point by selecting the maximum or the minimum of the output intensity.

Description

【発明の詳細な説明】 （ａ）　　発明の技術分野 本発明は偏波面保存光ファイバの偏波面整合方法、すな
わち偏波面保存光ファイバを光デバイス等に接続する際
の相互間の偏波面の整合を実現する方法に関し、特に該
光ファイバ端面の主軸検出を迅速かつ正確に行なう検出
方法に関する。Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a method for matching polarization planes of polarization-maintaining optical fibers, that is, a method for matching polarization planes between polarization-maintaining optical fibers when connecting them to optical devices, etc. The present invention relates to a method for realizing this, and particularly to a detection method for quickly and accurately detecting the principal axis of the end face of an optical fiber.

（ｂ）・技術の背景 情報伝送の媒体として光を利用するシステムが光フアイ
バ通信をはじめとして近年急速に増加しているが、これ
らのシステムにおいてしばしば伝送される光の偏波面を
保存することが必要とされる。(b)・Technological background Systems that use light as a medium for information transmission have rapidly increased in recent years, including optical fiber communications, but in these systems it is often difficult to preserve the plane of polarization of the transmitted light. Needed.

例えば光フアイバ通信に用いられる光変調器、方向性結
合器或いはフィルタ等に用いられるストリップ型光導波
路は一般に異方性であり、また多くの光デバイスの意図
する特性は特定のモードのみについて得られるものであ
る。また光源に用いられるレーザ光も直線偏光に近い状
態であって、所要のモードの光のみを高い効率をもって
伝送するために、偏波面保存光ファイバが用いられる。For example, strip-type optical waveguides used in optical modulators, directional couplers, filters, etc. used in optical fiber communications are generally anisotropic, and the intended characteristics of many optical devices can only be obtained for specific modes. It is something. Further, the laser light used in the light source is also in a state close to linearly polarized light, and a polarization-maintaining optical fiber is used to transmit only light in a desired mode with high efficiency.

また例えば電気光学結晶内で偏波面相互間に生する位相
差によって電界強度を検出する光電界センサーに偏波光
を入出力する光ファイバは当然に偏波面が保存されなけ
ればならない。Furthermore, for example, an optical fiber that inputs and outputs polarized light to a photoelectric field sensor that detects the electric field intensity based on the phase difference generated between the polarization planes within an electro-optic crystal must preserve the polarization plane.

（ｅ）　　従来技術と問題点 先に述べた偏波面保存光ファイバを光伝送路とするに際
しては、その光ファイバと接続される光デバイスとの間
において偏波面が整合されることが必要である。(e) Prior art and problems When using the aforementioned polarization-maintaining optical fiber as an optical transmission line, it is necessary to match the polarization plane between the optical fiber and the optical device to be connected. .

この偏波面を整合させて接続を行なうだめの偏波面保存
光ファイバ端面の主軸方向を検出する従来方法は例えは
下記の通りである。第１図に示す如く、偏波面保存光フ
ァイバ１の第１の端面Ａに、偏光子２及びレンズ３を介
して直線偏波光を入力し、ファイバ１の第２の端面Ｂか
らの出力光をレンズ４及び検光子５を介して光検知器６
に導いて、出力光の消光比を測定すれば、一般的にはこ
の出力光は楕円偏波光である。この状態から端面Ａを回
転してまず消光比が減少する回転方向を見出し、端面Ａ
の回転と消光比の測定とを繰返して、漸く直線偏波光が
入力して直線偏波光が出力される端面Ａ及びＢの主軸方
向が検出される。この様に従来は試行錯誤によって偏波
面保存光ファイバの端面の主軸方向を検出してお如、そ
の作業に長時間を要し、また作業の自動化を試みてもそ
の過程が複雑となる。An example of a conventional method for matching the polarization planes and detecting the principal axis direction of the end face of a polarization-maintaining optical fiber for connection is as follows. As shown in FIG. 1, linearly polarized light is input to the first end surface A of the polarization-maintaining optical fiber 1 via the polarizer 2 and lens 3, and the output light from the second end surface B of the fiber 1 is input to the first end surface A of the polarization-maintaining optical fiber 1. Photodetector 6 via lens 4 and analyzer 5
If the extinction ratio of the output light is measured by guiding the light to From this state, rotate end face A, first find the rotation direction in which the extinction ratio decreases, and then
By repeating the rotation of and the measurement of the extinction ratio, the directions of the principal axes of the end faces A and B, through which the linearly polarized light is input and the linearly polarized light is output, are finally detected. As described above, conventionally, the direction of the principal axis of the end face of a polarization-maintaining optical fiber has been detected by trial and error, which requires a long time, and even if an attempt is made to automate the process, the process becomes complicated.

（ｄ）　　発明の目的 本発明は前記の従来の状況に鑑み、偏波面保存光ファイ
バの端面の主軸方向を迅速適確に検出して、偏波面を整
合した接続を容易に実施することができる偏波面整合方
法を提供することを目的とする。(d) Purpose of the Invention In view of the above-mentioned conventional situation, the present invention is capable of quickly and accurately detecting the direction of the principal axis of the end face of a polarization-maintaining optical fiber and easily performing a connection in which the polarization planes are matched. The purpose is to provide a polarization plane matching method.

ｔｅｌ　　発明の構成 本発明の前記目的は、偏波面保存光ファイバの第１の端
面に光を入力し、該光ファイバの第２の端面の出力光を
検光子に導入し、該光ファイバに光路長の増減を繰返す
作用を加えつつ、前記検光子からの出力光の強度を測定
し、該出力光の強度が前記光路長の増減によって変化し
ない前記検光子の偏波面の方向を、前記第２の端面の主
軸方向と判定するととによシ達成される。tel Structure of the Invention The object of the present invention is to input light into a first end face of a polarization-maintaining optical fiber, introduce output light from a second end face of the optical fiber into an analyzer, and create an optical path in the optical fiber. The intensity of the output light from the analyzer is measured while repeating the increase/decrease in the optical path length, and the direction of the polarization plane of the analyzer, in which the intensity of the output light does not change due to the increase/decrease in the optical path length, is determined by the second This is achieved by determining the direction of the main axis of the end face.

３− ただし前記の光ファイバの光路長の増減を繰返すために
該光ファイバに加える作用とは、例えば間欠的な加熱、
弾性振動等であって、これらの作用を加えることによっ
て偏波面保存光ファイバの出力端における偏波光の２つ
のモード間の位相差の増減が繰返えされる。3- However, the action applied to the optical fiber in order to repeatedly increase and decrease the optical path length of the optical fiber is, for example, intermittent heating,
By applying these effects, such as elastic vibrations, the phase difference between the two modes of polarized light at the output end of the polarization-maintaining optical fiber increases and decreases repeatedly.

なお、本発明においては入力光が直線偏波光である必要
はないが、入力光が直線偏波光である場合には、特に前
記入力光に対する前記第１の端面の相対的回転に関して
前記検光子の出力光の強度が極値とならざる方向に、該
第１の端面を配置して前記測定を実施する。Note that in the present invention, the input light does not need to be linearly polarized light, but if the input light is linearly polarized light, the analyzer may be particularly sensitive to relative rotation of the first end surface with respect to the input light. The measurement is performed by arranging the first end face in a direction in which the intensity of the output light does not reach an extreme value.

（ｆ）　　発明の実施例 以下本発明を実施例により図面を参照して具体的に説明
する。(f) Embodiments of the Invention The present invention will be specifically described below by way of embodiments with reference to the drawings.

第２図は本発明の実施例における偏波面保存光ファイバ
端面の主軸方向判定工程の説明図である。FIG. 2 is an explanatory diagram of a step of determining the principal axis direction of the end face of a polarization-maintaining optical fiber in an embodiment of the present invention.

図において、１１は偏波面保存光ファイバ、１２は光源
、１３及び１４はレンズ、１５は検光子、１６は光検知
器、１７は微分演算を含む演算回路、４− １８は光ファイバ１１の端面を回転させる回転機構を示
す。In the figure, 11 is a polarization maintaining optical fiber, 12 is a light source, 13 and 14 are lenses, 15 is an analyzer, 16 is a photodetector, 17 is an arithmetic circuit including a differential operation, and 4-18 are the end faces of the optical fiber 11. The rotation mechanism that rotates is shown.

本発明においては光源１２はその偏光状態が安定してい
ることは当然に必要であるが、前記従来例の如く直線偏
波光であることを必要としない。In the present invention, it is naturally necessary that the light source 12 has a stable polarization state, but it does not need to be linearly polarized light as in the conventional example.

更に光ファイバ１１の光入力端面Ａの主軸方向は、光源
が直線偏波光であるときに端面Ａの主軸方向がたまたま
光源の偏波面に一致することを避けることを除いて、何
等選択する必要はない。Furthermore, the direction of the principal axis of the optical input end surface A of the optical fiber 11 does not need to be selected in any way, except to avoid that the direction of the principal axis of the end surface A coincidentally coincides with the plane of polarization of the light source when the light source is linearly polarized light. do not have.

本実施例においては、検光子１５の出力光の強度を光検
知器１６によって求め、演算回路１７に含まれる微分回
路によって前記強度の変化率を求めて、この変化率が零
となるように回転機構１８によって光ファイバ１１の出
力端面Ｂを回転する構成がとられている。In this embodiment, the intensity of the output light of the analyzer 15 is determined by the photodetector 16, the rate of change in the intensity is determined by the differential circuit included in the arithmetic circuit 17, and the rotation is performed so that this rate of change becomes zero. A configuration is adopted in which the output end face B of the optical fiber 11 is rotated by the mechanism 18.

前記構成のもとで、光ファイバ１１の例えば巻回部分等
を断続的に加熱するならば光ファイノ（１１の光路長が
増減して、出力端面Ｂからの出力光の２成分モード間の
位相差の増減を生ずる。この位相差の増減によって一般
的には検光子１５の出力光の強度が変動する。Under the above configuration, if the winding portion of the optical fiber 11 is intermittently heated, the optical path length of the optical fiber 11 increases or decreases, and the position between the two component modes of the output light from the output end surface B changes. This causes an increase or decrease in the phase difference. Generally, the intensity of the output light from the analyzer 15 fluctuates due to this increase or decrease in the phase difference.

前述の如く光ファイバ１１の出力端面Ｂを検光子１５に
対して回転して、検光子１５の出力光の強度が、ファイ
バ１１の出力光の成分モード相互間の位相差に関して変
化しない状態とすることは、検光子１５の偏波面にファ
イバ１１の出力端面Ｂの主軸の１つが合致し、他の主軸
が直交する配置とすることである。この様にして偏波面
保存光ファイバの１方の端面の主軸方向が容易に検出さ
れる。As described above, the output end face B of the optical fiber 11 is rotated with respect to the analyzer 15 so that the intensity of the output light of the analyzer 15 does not change with respect to the phase difference between the component modes of the output light of the fiber 11. This means that one of the principal axes of the output end face B of the fiber 11 matches the polarization plane of the analyzer 15, and the other principal axes are orthogonal to each other. In this way, the principal axis direction of one end face of the polarization maintaining optical fiber can be easily detected.

前述の如く主軸が検出された１方の端面を光デバイスに
偏波面を整合して接続すれば、光ファイバの他方の端面
の接続は出力光強度の極大又は極小を選択することによ
って、任意の時点において容易に行なうことができる。As mentioned above, if one end surface where the principal axis is detected is connected to an optical device with the polarization plane matched, the connection of the other end surface of the optical fiber can be made in any arbitrary manner by selecting the maximum or minimum of the output light intensity. It can be easily done at any time.

前記実施例においては、偏波面保存光ファイバ１１の光
路長の増減を断続的加熱によって行なっているが、先に
述べた如く機械的に外力を加えて弾性振動を生じさせる
などの他の手段を用いてもよい。In the embodiment described above, the optical path length of the polarization-maintaining optical fiber 11 is increased or decreased by intermittent heating, but as described above, other means such as mechanically applying an external force to generate elastic vibrations may also be used. May be used.

また本発明の方法において、光源１２として楕円偏波又
は直紡偏波光源を用いるならば、前記実施例の如く光フ
ァイバ１１の出力側の主軸方向を検出した後に、光源に
対して入力側の端面Ａを回転して出力光の強度が極大又
は極小となる方向を検出することによって、この端面Ａ
の主軸方向をも容易に判定することができる。In addition, in the method of the present invention, if an elliptically polarized or direct polarized light source is used as the light source 12, after detecting the principal axis direction on the output side of the optical fiber 11 as in the above embodiment, By rotating the end face A and detecting the direction in which the intensity of the output light is maximum or minimum, this end face A
The direction of the main axis can also be easily determined.

（ｇ）　　発明の詳細 な説明した如く本発明によれば、偏波面保存光ファイバ
と光デバイス等との偏波面の整合を迅速かつ正確に行な
うことができ、特に作業の自動化が容易に可能となる。(g) As described in detail, according to the present invention, it is possible to quickly and accurately match the plane of polarization between a polarization-maintaining optical fiber and an optical device, etc., and in particular, automation of the work is easily possible. Become.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は偏波面保存光ファイバの端面の主軸方向検出方
法の従来例を示す説明図、第２図は本発明の実施例を示
す説明図である。 区において、１１は偏波面保存光ファイバ、１２は光源
、１３及び１４はレンズ、１５は検光子、１６は光検知
器、１７は演算口ｊ１４、ｔｓ：ＺＱ回転機構を示す。FIG. 1 is an explanatory diagram showing a conventional method for detecting the principal axis direction of an end face of a polarization-maintaining optical fiber, and FIG. 2 is an explanatory diagram showing an embodiment of the present invention. 11 is a polarization maintaining optical fiber, 12 is a light source, 13 and 14 are lenses, 15 is an analyzer, 16 is a photodetector, 17 is an arithmetic aperture j14, and ts:ZQ rotation mechanism.

Claims (2)

【特許請求の範囲】[Claims] （１）偏波面保存光ファイバの第１の端面に光を入力し
、収光ファイバの第２の端面の出力光を検光子に導入し
、該光ファイバに光路長の増減を繰返す作用を加えつつ
、前記検光子からの出力光の強度を測定し、該出力光の
強度が前記光路長の増減によって変化しない前記検光子
の偏波面の方向を、前記第２の端面の主軸方向と判定す
る工程を含んでなることを特徴とする偏波面保存光ファ
イバの偏波面整合方法。(1) Input light into the first end face of a polarization-maintaining optical fiber, introduce the output light from the second end face of the condensing fiber into an analyzer, and apply an action that repeatedly increases and decreases the optical path length to the optical fiber. At the same time, the intensity of the output light from the analyzer is measured, and the direction of the polarization plane of the analyzer, in which the intensity of the output light does not change with increase or decrease in the optical path length, is determined to be the principal axis direction of the second end surface. 1. A polarization plane matching method for a polarization maintaining optical fiber, the method comprising the steps of: （２）前記入力光に対する前記第１の端面の相対的回転
に関して前記検光子の出力光の強度が極値とならざる方
向に、該第１の端面を配置することを特徴とする特許請
求の範囲第１項記載の偏波面保存光ファイバの偏波面整
合方法。(2) The first end face is arranged in a direction in which the intensity of the output light of the analyzer does not reach an extreme value with respect to the relative rotation of the first end face with respect to the input light. A method for matching the polarization plane of a polarization maintaining optical fiber according to scope 1.
JP58085336A 1983-05-16 1983-05-16 Polarizing plane matching method of polarizing plane maintaining optical fiber Pending JPS59211010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58085336A JPS59211010A (en) 1983-05-16 1983-05-16 Polarizing plane matching method of polarizing plane maintaining optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58085336A JPS59211010A (en) 1983-05-16 1983-05-16 Polarizing plane matching method of polarizing plane maintaining optical fiber

Publications (1)

Publication Number Publication Date
JPS59211010A true JPS59211010A (en) 1984-11-29

Family

ID=13855794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58085336A Pending JPS59211010A (en) 1983-05-16 1983-05-16 Polarizing plane matching method of polarizing plane maintaining optical fiber

Country Status (1)

Country Link
JP (1) JPS59211010A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04123011A (en) * 1990-09-14 1992-04-23 Japan Aviation Electron Ind Ltd Light source module and optical fiber alignment and fixation device
CN104614803A (en) * 2015-01-27 2015-05-13 北京航空航天大学 ARM-based integrated polarization maintaining fiber axis positioning instrument

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04123011A (en) * 1990-09-14 1992-04-23 Japan Aviation Electron Ind Ltd Light source module and optical fiber alignment and fixation device
CN104614803A (en) * 2015-01-27 2015-05-13 北京航空航天大学 ARM-based integrated polarization maintaining fiber axis positioning instrument
CN104614803B (en) * 2015-01-27 2018-03-06 北京航空航天大学 Integrated polarization-preserving fiber axis fixing instrument based on ARM

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