JPS59204738A - Method for injecting light to polarized axis of optical fiber for maintaining plane of polarization - Google Patents

Method for injecting light to polarized axis of optical fiber for maintaining plane of polarization

Info

Publication number
JPS59204738A
JPS59204738A JP7981283A JP7981283A JPS59204738A JP S59204738 A JPS59204738 A JP S59204738A JP 7981283 A JP7981283 A JP 7981283A JP 7981283 A JP7981283 A JP 7981283A JP S59204738 A JPS59204738 A JP S59204738A
Authority
JP
Japan
Prior art keywords
polarization
optical fiber
light
polarizing plate
maintaining optical
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.)
Granted
Application number
JP7981283A
Other languages
Japanese (ja)
Other versions
JPH0354290B2 (en
Inventor
Takeyoshi Takuma
詫摩　勇悦
Hiroshi Kajioka
博 梶岡
Noribumi Shiina
則文 椎名
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.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP7981283A priority Critical patent/JPS59204738A/en
Publication of JPS59204738A publication Critical patent/JPS59204738A/en
Publication of JPH0354290B2 publication Critical patent/JPH0354290B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To measure an extinction ratio, by providing a disturbing part, which imparts the change of state to a part of an optical fiber for maintaining the plane of polarization, and injecting polarized light to a polarized axis accurately in a short time. CONSTITUTION:A polarizing plate 2a and a lambda/2 plate 3 are adjusted so that detected power becomes the minimum value, and the polarizing plate 2a and the lambda/2 plate 3 are fixed. A polarizing plate 2b is rotated, and the maximum value and the minimum value of the detected power are read by a detector 6. Based on the difference, an extinction ratio is obtained. An arbitrary vibration is imparted to an arbitrary part of an optical fiber 5 for maintaining the plane of polarization by a vibration applying part 7, e.g., a motor, a speaker and the like. When the polarized light, which agrees with an inherent polarized axis, is made incident to the optical fiber 5 for maintaining the plane of polarization, the device is not disturbed by the vibration and the polarizing direction of the transmitted light is not changed. Therefore, the optimum light injecting method is obtained.

Description

【発明の詳細な説明】 本発明は光通信等に用いられる偏波面保存光ファイノ々
の消光比測定系に係り、特に、偏波面保存光ファイノ々
偏光軸への光入射方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extinction ratio measurement system for polarization-maintaining optical fibers used in optical communications, and more particularly to a method for injecting light into the polarization axis of polarization-maintaining optical fibers.

第１図は偏波面保存光ファイ・ぐの従来の消光比測定系
の系統図である。光源１から出射した光は偏光板２ａ及
びλ／２板３を通過した後レンズ４ａで集光して偏波面
保存光ファイバ５へ入射させる。FIG. 1 is a system diagram of a conventional extinction ratio measurement system using a polarization preserving optical fiber. The light emitted from the light source 1 passes through a polarizing plate 2a and a λ/2 plate 3, and then is condensed by a lens 4a, and is made to enter a polarization-maintaining optical fiber 5.

この偏波面保存光ファイツクから出射した光はレンズ４
ｂで略平行光束とされ偏光板２ｂを通り光電式の検知器
６で検出される。The light emitted from this polarization preserving optical fiber is transmitted through the lens 4.
At b, the light beam is made into a substantially parallel beam, passes through a polarizing plate 2b, and is detected by a photoelectric detector 6.

消光比を測定するには、まづ、偏光板２ａとλ／２板３
の回転角を調節して検出電力が最小にｋつた時、λ／２
板３は固定し偏光板２ｂを回転させて信号電力の最大値
ｄ　Ｂｍａｘ、と最小値ｄＢｒｎｉｎ、を検出器で読み
、その差を求める。このように偏波面保存光ファイバ５
を静止させた状態では、光源１の光のコヒーレンス長と
偏波面保存光ファイバ５の結合長との関係で、固有偏光
軸に光が入射してぃなくとも検出電力が最小になったり
、或いは検出電力が時間的に変動することがあり、偏波
面保存光ファイバの偏光軸に偏光を合致させて入射させ
るのが極めて困難であるという問題点をもっていた。To measure the extinction ratio, first, polarizing plate 2a and λ/2 plate 3
When the detected power reaches the minimum by adjusting the rotation angle of λ/2
The plate 3 is fixed, the polarizing plate 2b is rotated, the maximum value dBmax and the minimum value dBrnin of the signal power are read by a detector, and the difference between them is determined. In this way, polarization maintaining optical fiber 5
When the light source 1 is stationary, the detected power is minimized even if the light is not incident on the eigenpolarization axis, or The detected power may fluctuate over time, and it is extremely difficult to align the polarized light with the polarization axis of the polarization-maintaining optical fiber.

本発明は上記従来技術の欠点を解消し、短時間で正確に
偏光軸に偏光を入射させて消光比を測定するととができ
る偏波面保存光ファイバ偏光軸への光入射方法を提供す
ることを目的とし、その特徴とするところは、偏波面保
存光ファイバの一部に状態の変化を与えるしよう乱部を
設け、第２の偏光板を回転させて光電検知器の検出電力
の最大・最小値の差が最大となるごとく設定することに
ある０ 第２図は本発明の一実施例である偏波面保存光ファイバ
の消光比測定系の系統図で、第１図と同じ部分には同一
符号を付しである。この場合は偏波面保存光ファイバ５
の一部に振動印加部７を設けている。消光比の測定は前
記と同様に、偏光板２ａとλ／２板３とを調節して検出
電力が最小となるようにして偏光板２ａとλ／２板３を
固定する。The present invention eliminates the drawbacks of the above-mentioned prior art and provides a method for injecting light into the polarization axis of a polarization-maintaining optical fiber, which allows the extinction ratio to be measured by accurately injecting polarized light into the polarization axis in a short time. Its purpose and characteristics are that a disturbance section is provided to change the state of a part of the polarization-maintaining optical fiber, and the second polarizing plate is rotated to detect the maximum and minimum values of the power detected by the photoelectric detector. Figure 2 is a system diagram of an extinction ratio measurement system for a polarization-maintaining optical fiber, which is an embodiment of the present invention. It is attached. In this case, polarization maintaining optical fiber 5
A vibration applying section 7 is provided in a part of the. To measure the extinction ratio, as described above, the polarizing plate 2a and the λ/2 plate 3 are fixed so that the detected power is minimized by adjusting the polarizing plate 2a and the λ/2 plate 3.

次に偏光板３を回転させて検出電力の最大値ｄＢｍａｘ
。Next, rotate the polarizing plate 3 to maximize the detected power in dBmax.
.

と最小値ｄＢｍｉｎ、を検出器６で読み、その差によっ
て消光比を求める。and the minimum value dBmin are read by the detector 6, and the extinction ratio is determined from the difference between them.

この測定中に偏波面保存光ファイバの任意の一部分を、
例えばモータやスピーカ等で任意の振動を与えて置く。During this measurement, any part of the polarization-maintaining optical fiber is
For example, apply arbitrary vibrations using a motor, speaker, etc.

一方、偏波面保存光ファイバ５に振動等の外部じよう乱
を与えた場合は、固有の偏光軸に合致した偏光が偏波面
保存光ファイバに入射しているときは、上記振動によっ
て乱されることなく伝送光の偏光方向も変化しないとい
う性ηをもっている。したがって、被検偏波面保存光フ
ァイノ々５に振動を与え乍ら検出電力が最小になる様に
λ／２板と偏光板２ｂを回転させてこれを固定するとき
は、最適の光入射方法となっている。On the other hand, when external disturbances such as vibrations are applied to the polarization-maintaining optical fiber 5, when polarized light that matches the unique polarization axis is incident on the polarization-maintaining optical fiber 5, it will be disturbed by the vibration. It has the property η that the polarization direction of the transmitted light also does not change. Therefore, when rotating and fixing the λ/2 plate and the polarizing plate 2b so that the detected power is minimized while giving vibration to the polarization-maintaining optical fibers 5 to be tested, it is necessary to use the optimum light input method. It has become.

このように偏波面保存光ファイバの一部分に簡単な手段
で任意の振動を与えるだけで固有の偏光軸に好適な状態
で光を入射させることが可能となったことは、消光比の
測定を容易にして能率化されることを示している。即ち
、この方法は動的な消光比測定系といえる。In this way, it is now possible to input light in a state suitable for a specific polarization axis by simply applying arbitrary vibration to a part of a polarization-maintaining optical fiber, which makes it easy to measure the extinction ratio. This shows that it can be streamlined. In other words, this method can be said to be a dynamic extinction ratio measurement system.

、本実施例の光入射方法は、第１の偏光板とλ／２゜板
の回転角度を調節して光電検知器での検知電力を最小の
状態とし、その後偏波面保存光ファイ・々の一部を振動
させ乍ら第２の偏光板を回転させて最大・最小の検知電
力の差が最大となるように設定することにより、容易に
、かつ、正確な消光比が求められるという効果をもって
いる。The light input method of this embodiment is to minimize the detected power by the photoelectric detector by adjusting the rotation angle of the first polarizing plate and the λ/2° plate, and then to connect the polarization-maintaining optical fibers. By rotating a part of the polarizing plate and setting it so that the difference between the maximum and minimum detected power is maximized, it is possible to easily and accurately determine the extinction ratio. There is.

上記実施例は偏波面保存光ファイ、Ｆに振動を与えて測
定しているが、振動の代９に適尚な物理的な外部じよう
乱、例えば、偏波面保存光ファイバの一部分に伸びを与
えるようにしてもよい。但し、この・伸びは時間的にラ
ンダムとなる様にしなければならない。なお、この伸び
はドライヤー等によって温風を局部的に吹きつけて温度
変化を与えることで生じさせるようにしてもよい。In the above embodiment, measurements are made by applying vibration to the polarization-maintaining optical fiber F, but instead of the vibration, appropriate physical external disturbances, such as elongation to a part of the polarization-maintaining optical fiber, are applied. You may also give it to them. However, this elongation must be made to be random over time. Note that this elongation may be caused by blowing hot air locally using a dryer or the like to change the temperature.

本発明の偏波面保存光ファイバ偏光軸への光入射方法は
、短時間で容易に固有偏光軸に合致させて偏光を入射す
ることができ、従来の測定系に僅かにじよう乱部を付加
するだけで容易に可能となシ、消光比を正確に測定でき
るという効果が得られる。The method of injecting light into the polarization axis of a polarization-maintaining optical fiber according to the present invention can easily input polarized light in a short time while matching the intrinsic polarization axis, and adds a slight disturbance to the conventional measurement system. The effect of accurately measuring the extinction ratio can be obtained by simply doing this.

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

第１図は偏波面保存光ファイバの従来の消光比測定系の
系統図、第２図は本発明の一実施例である偏波間保存光
ファイバの消光比測定系の系統図である。 ■・・・光源、２・・・偏光板、３・λ／２板、４・・
レンズ、５・・・偏波面保存光ファイバ、６・・・検知
器、７・・振動印加部。 第　１　図 Ｉ　　　ＺｃＬ３　　４α　　　　　５ｚ番　　　　６ ４Ａ　　２番　　ｂFIG. 1 is a system diagram of a conventional extinction ratio measurement system for a polarization-maintaining optical fiber, and FIG. 2 is a system diagram of an extinction ratio measurement system for a polarization-maintaining optical fiber, which is an embodiment of the present invention. ■...Light source, 2...Polarizing plate, 3.λ/2 plate, 4...
Lens, 5... Polarization preserving optical fiber, 6... Detector, 7... Vibration applying section. Figure 1 I ZcL3 4α 5z No. 6 4A No. 2 b

Claims (2)

【特許請求の範囲】[Claims] （１）　　光源より出射した光を第１の偏光板とλ／２
板を通過させた後に集光して偏波面保存光ファイバに入
射させ、この偏波面保存光ファイバよりの出射光を集光
し第２の偏光板を通過させて光電検知器で検知するごと
く構成した上記偏波面保存光ファイ・この消光比測定系
において、上記偏波面保存光ファイバの一部に状態の変
化を与えるしよう乱部を設け、上記第２の偏光板を回転
させて上記光電検知器の検出電力の最大・最小値の差が
最大となる如く設定することを特徴とする偏波面保存光
ファイバ偏光軸への光入射方法。(1) The light emitted from the light source is connected to the first polarizing plate by λ/2
After passing through the plate, the light is focused and input into a polarization-maintaining optical fiber, and the light emitted from the polarization-maintaining optical fiber is focused, passed through a second polarizing plate, and detected by a photoelectric detector. In this extinction ratio measurement system, a disturbance section is provided to change the state of a part of the polarization-maintaining optical fiber, and the second polarizing plate is rotated to detect the photoelectric detector. A method for introducing light into a polarization axis of a polarization-maintaining optical fiber, characterized in that the difference between the maximum and minimum values of detected power is set to be maximum. （２）上記しよう乱部が、振動印加部である特許請求の
範囲第１項記載の偏波面保存光ファイバ偏光軸への光入
射方法。(2) A method for introducing light into a polarization axis of a polarization-maintaining optical fiber according to claim 1, wherein the disturbance section is a vibration application section.
JP7981283A 1983-05-07 1983-05-07 Method for injecting light to polarized axis of optical fiber for maintaining plane of polarization Granted JPS59204738A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7981283A JPS59204738A (en) 1983-05-07 1983-05-07 Method for injecting light to polarized axis of optical fiber for maintaining plane of polarization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7981283A JPS59204738A (en) 1983-05-07 1983-05-07 Method for injecting light to polarized axis of optical fiber for maintaining plane of polarization

Publications (2)

Publication Number Publication Date
JPS59204738A true JPS59204738A (en) 1984-11-20
JPH0354290B2 JPH0354290B2 (en) 1991-08-19

Family

ID=13700616

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7981283A Granted JPS59204738A (en) 1983-05-07 1983-05-07 Method for injecting light to polarized axis of optical fiber for maintaining plane of polarization

Country Status (1)

Country Link
JP (1) JPS59204738A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6382336A (en) * 1986-09-26 1988-04-13 Anritsu Corp Optical fiber exciter
JPS63133035A (en) * 1986-11-26 1988-06-04 Anritsu Corp Light transmission characteristic tester
WO2002101439A1 (en) * 2001-06-07 2002-12-19 3M Innovative Properties Company Method and apparatus for aligning the polarization of a polarization maintaining optical fiber to the polarization of a light source
CN103293606A (en) * 2013-05-13 2013-09-11 光库通讯(珠海)有限公司 Fiber adapter and measurement method for extinction ratio of optical fiber connector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI749789B (en) * 2020-09-28 2021-12-11 東建安股份有限公司 Mask making machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120146A (en) * 1982-01-13 1983-07-16 Nippon Telegr & Teleph Corp <Ntt> Measuring method for polarization characteristic of optical fiber

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120146A (en) * 1982-01-13 1983-07-16 Nippon Telegr & Teleph Corp <Ntt> Measuring method for polarization characteristic of optical fiber

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6382336A (en) * 1986-09-26 1988-04-13 Anritsu Corp Optical fiber exciter
JPS63133035A (en) * 1986-11-26 1988-06-04 Anritsu Corp Light transmission characteristic tester
JPH0363010B2 (en) * 1986-11-26 1991-09-27 Anritsu Corp
WO2002101439A1 (en) * 2001-06-07 2002-12-19 3M Innovative Properties Company Method and apparatus for aligning the polarization of a polarization maintaining optical fiber to the polarization of a light source
US6721467B2 (en) 2001-06-07 2004-04-13 3M Innovative Properties Company Method and apparatus for aligning the polarization of a polarization maintaining optical fiber to the polarization of a light source
CN103293606A (en) * 2013-05-13 2013-09-11 光库通讯(珠海)有限公司 Fiber adapter and measurement method for extinction ratio of optical fiber connector

Also Published As

Publication number Publication date
JPH0354290B2 (en) 1991-08-19

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