JPH01112219A - Polarization controller - Google Patents
Polarization controllerInfo
- Publication number
- JPH01112219A JPH01112219A JP26985787A JP26985787A JPH01112219A JP H01112219 A JPH01112219 A JP H01112219A JP 26985787 A JP26985787 A JP 26985787A JP 26985787 A JP26985787 A JP 26985787A JP H01112219 A JPH01112219 A JP H01112219A
- Authority
- JP
- Japan
- Prior art keywords
- polarization
- output terminals
- fiber coupler
- absolute single
- output
- 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
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 67
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 230000003287 optical effect Effects 0.000 abstract description 17
- 239000013307 optical fiber Substances 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
- C07C45/70—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction with functional groups containing oxygen only in singly bound form
- C07C45/71—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction with functional groups containing oxygen only in singly bound form being hydroxy groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は偏光の偏波面を制御する構造簡単な偏光コント
ローラに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polarization controller with a simple structure that controls the plane of polarization of polarized light.
［従来の技術］
光学領域においてジョーンズの原理が知られている。す
なわち、［任意の方向に偏光軸を傾けた複屈折物質及び
光学活性を有する物質の様に直線偏波を回転させること
が出来る旋光子が何個連続して連なろうとも、それらは
１つの複屈折物質と１つの旋光子とで代表できる」とい
うものである。[Prior Art] Jones' principle is known in the optical field. In other words, [no matter how many optical rotators that can rotate linearly polarized waves, such as birefringent materials whose polarization axes are tilted in arbitrary directions and optically active materials, are connected in succession, they are one It can be represented by a birefringent substance and one optical rotator.
通常のシングルモードファイバはこの例に当てはまる。A typical single mode fiber fits this example.
従ってシングルモードファイバを用いてコヒーレント光
通信を行う場合には、出射光の偏光状態を局部発振レー
ザのそれと一致させるために偏光コントローラが用いら
れる。Therefore, when performing coherent optical communication using a single mode fiber, a polarization controller is used to match the polarization state of the emitted light with that of the local oscillation laser.
この偏光不整合を補償する方法には次の３つが考えられ
ている。The following three methods have been considered to compensate for this polarization mismatch.
■ 光学的手段により受信光の偏波面制御を行う方法
■ 直交する偏波面に対して独立に検波を行い、これを
電気的に合成した後に復号する合成偏波ダイパーシティ
方法
■ 直交する偏波面に対して独立に検波、復号を行なっ
た後に、２つの受信データの符号則検査を行なってより
確からしい出力データを得る制御偏波ダイパーシティ方
法
［発明が解決しようとする問題点］
ところが、上記■、■の方法は複雑な信号処理を要し、
また■の方式は考え方は簡単であるが、光学的偏波制御
部が複雑になるという理由で採用されていない。■ A method for controlling the plane of polarization of received light using optical means.■ A composite polarization diapersity method in which the orthogonal polarization planes are independently detected, electrically synthesized, and then decoded. ■ A method for controlling the polarization plane of the received light using optical means. However, the above-mentioned ■ , ■ method requires complex signal processing,
Furthermore, although the concept of method (2) is simple, it has not been adopted because the optical polarization control section becomes complicated.
本発明の目的は、前記した従来技術の欠点を解消し、光
学的偏波制御を行なう構造簡単な偏光コントローラを提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a polarization controller with a simple structure that performs optical polarization control.
［問題点を解決するための手段］
本発明の偏光コントローラは、絶対単一偏波ファイバカ
プラーの入力端子の前方に、入射される偏光の偏波面を
回転制御する偏波面回転制御手段を設け、上記カプラー
の２つの出力端子のうちの１方の出力を検出器で検出し
てその検出値を最大にするように上記偏波面回転制御手
段により入射される偏光の回転制御を行うようにしたも
のである。[Means for Solving the Problems] The polarization controller of the present invention includes polarization plane rotation control means for rotationally controlling the polarization plane of incident polarized light in front of the input terminal of the absolute single polarization fiber coupler, The output of one of the two output terminals of the coupler is detected by a detector, and the rotation of the incident polarized light is controlled by the polarization plane rotation control means so as to maximize the detected value. It is.
［作 用コ
偏光コントローラに入射した偏光は、偏波面回転制御手
段によって偏波面の回転を受け、絶対単一偏波ファイバ
カプラーにその入力端子より入射し、所定の分岐比で２
つの出力端子から出射する。[Operation] The polarized light incident on the polarization controller undergoes rotation of the polarization plane by the polarization plane rotation control means, enters the absolute single polarization fiber coupler from its input terminal, and is divided into two polarizations at a predetermined branching ratio.
Emit from two output terminals.
一方の出力端子の出射光の出力は検出器で検出され、そ
の検出値を最大にするように偏波面回転制御手段により
入射される偏光の回転制御が行なわれる。従って、絶対
単一偏波ファイバカプラーのもう一方の出力端子からは
絶対単一偏波フッ・イバの偏波モードの直線偏光が出射
される。The output of the light emitted from one output terminal is detected by a detector, and the rotation of the incident polarized light is controlled by the polarization plane rotation control means so as to maximize the detected value. Therefore, linearly polarized light in the polarization mode of the absolute single polarization fiber is emitted from the other output terminal of the absolute single polarization fiber coupler.
［実施例コ 以下に本発明の実施例を図面を用いて説明する。[Example code] Embodiments of the present invention will be described below with reference to the drawings.
第１図に本発明の偏光コント［］−ラの一実施例を示す
。本実施例の偏光コントローラは、偏波面回転機構部２
と絶対単一偏波ファイバカプラー３と光デイテクタ４と
回転制御インターフェース５とから主に構成されており
、入射光ファイバ１より光が入射される。FIG. 1 shows an embodiment of the polarization controller of the present invention. The polarization controller of this embodiment has a polarization plane rotation mechanism section 2.
It mainly consists of an absolute single polarization fiber coupler 3, an optical detector 4, and a rotation control interface 5, into which light is input from an input optical fiber 1.
入射光ファイバ１の出射光は偏波面回転機構部２に入射
し、偏光面の回転を受ける。偏波面回転機構部２は、第
４図に示すように、旋光子としての１７２波長板１２を
回転駆動装置１４により機械的に回転させる構造である
。The output light from the input optical fiber 1 enters the polarization plane rotation mechanism section 2 and undergoes rotation of the polarization plane. As shown in FIG. 4, the polarization plane rotation mechanism 2 has a structure in which a 172-wavelength plate 12 serving as an optical rotator is mechanically rotated by a rotation drive device 14.
偏波面回転機構部２で偏光面の回転を受けた光は絶対単
一偏波ファイバカプラー３の一つの入力端子３．１に接
続される。（なお、本実施例ではもう一つの入力端子３
．２は使用されていない。）入力端子３，１から入射さ
れた光はカプラー３で分岐され、その２つの出力端子３
．３． ３．４から出射される。The light whose polarization plane has been rotated by the polarization plane rotation mechanism section 2 is connected to one input terminal 3.1 of the absolutely single polarization fiber coupler 3. (In this embodiment, another input terminal 3
．． 2 is not used. ) The light incident from the input terminals 3 and 1 is split by the coupler 3, and the light is split into two output terminals 3.
．． 3. It is emitted from 3.4.
絶対単一偏波ファイバカプラー３は、第２図に示すコア
６、クラッド７、ジャケット８．サポート９からなる楕
円ジャケット形の絶対単一偏波ファイバ１０を用い、こ
の絶対単一偏波ファイバ１０を第３図に示すように基板
１１に湾曲させて嵌め込んで楕円の長軸方向に機械的に
研削した２板の基板１１を張り合せたものである。本実
施例ではカプラー３の分岐比は５％とした。すなわち、
出力端子３．４には５％、出力端子３３には９５％の信
号光が出射される。なお、カプラー３の分岐比は伝送シ
ステムによって多少の変更を加える。The absolute single polarization fiber coupler 3 includes a core 6, a cladding 7, a jacket 8 . Using an elliptical jacket-shaped absolutely single polarized fiber 10 consisting of a support 9, this absolutely single polarized fiber 10 is curved and fitted into a substrate 11 as shown in FIG. It is made by bonding two boards 11 that have been ground together. In this example, the branching ratio of the coupler 3 was 5%. That is,
5% of the signal light is emitted to the output terminal 3.4, and 95% of the signal light is emitted to the output terminal 33. Note that the branching ratio of the coupler 3 is slightly changed depending on the transmission system.
出力端子３．４の出力光は光デイテクタ４により一
５ −
受光される。出力端子３．４側のファイバ１０はより絶
対単一動作を実現させるために所定の曲がりを与えてい
る。光デイテクタ４により出力端子３．４の出射光の強
度が検出され、その検出量が常に最大になるように回転
制御インターフェース５を介して偏波面回転機構部２が
制御される。これにより、入射光ファイバ１と絶対単一
偏波ファイバカプラー３の入力端子３．１の偏光面を整
合させることができ、直線偏光が出力端子３．３から出
射される。The output light from the output terminals 3 and 4 is unified by the optical detector 4.
5 - Light is received. The fiber 10 on the output terminal 3.4 side is given a predetermined bend in order to achieve more absolute single operation. The optical detector 4 detects the intensity of the light emitted from the output terminal 3.4, and the polarization plane rotation mechanism 2 is controlled via the rotation control interface 5 so that the detected amount is always maximized. Thereby, the polarization planes of the input optical fiber 1 and the input terminal 3.1 of the absolutely single polarized fiber coupler 3 can be matched, and linearly polarized light is emitted from the output terminal 3.3.
なお、上記実施例の偏波面回転機構部２は、１７２波長
板１２を回転駆動させるものであったが、入力端子３１
または入射光ファイバ１の出射端を直接回転させてもよ
いし、あるいは、第５図に示すように、ファラデー素子
１６を用い、ファラデー素子１６に巻回したコイルに流
れる電流を可変電流源１５で制御して、ファラデー素子
１６に印加される磁界をコントロールする構造のものと
してもよい。The polarization plane rotation mechanism 2 of the above embodiment rotates the 172-wavelength plate 12, but the input terminal 31
Alternatively, the output end of the input optical fiber 1 may be directly rotated, or as shown in FIG. It may also have a structure in which the magnetic field applied to the Faraday element 16 is controlled.
［発明の効果］
以上数するに本発明によれば、絶対単一偏波ファイバカ
プラーを用いているため、構造が簡易となり、また安定
した偏波面の直線偏光が得られる。従って、本発明の偏
光コントローラを用いることにより、コヒーレント通信
用伝送路として通常のシングルモードファイバの使用が
可能となり、光伝送系ゐ経済性が図れる。[Effects of the Invention] According to the present invention, since an absolutely single polarization fiber coupler is used, the structure is simple and linearly polarized light with a stable polarization plane can be obtained. Therefore, by using the polarization controller of the present invention, it is possible to use a normal single mode fiber as a transmission line for coherent communication, and the economic efficiency of the optical transmission system can be achieved.
第１図は本発明に係る偏光コントローラの一実施例の全
体構成を示す構成図、第２図は第１図の絶対単一偏波フ
ァイバカプラーに用いた絶対単一偏波、ファイバの横断
面図、第３図は第１図の絶対単一偏波ファイバカプラー
を拡大水するものであって、同図（ａ）は縦断面図、同
図（ｂ）は横断面図、第４図は第１図の偏波面回転機構
部の構成図、第５図は偏波面回転機構部の他の実施例を
示す構成図である。
図中、１は入射光ファイバ、２は偏波面回転機構部、３
は絶対単一偏波ファイバカプラー、４は光デイテクタ、
５は回転制御インターフェース、６はコア、７はクラッ
ド、８はジャケット、９はサポート、１０は絶対単一偏
波ファイバ、１１は石英基板、１２は１７２波長板、１
３はレンズ、１４は回転駆動装置、１５は可変電流源、
１６はファラデー素子である。FIG. 1 is a block diagram showing the overall configuration of an embodiment of the polarization controller according to the present invention, and FIG. 2 is a cross section of the absolute single polarization fiber used in the absolute single polarization fiber coupler of FIG. 3 shows an enlarged view of the absolute single polarization fiber coupler shown in FIG. FIG. 1 is a configuration diagram of the polarization plane rotation mechanism section, and FIG. 5 is a configuration diagram showing another embodiment of the polarization plane rotation mechanism section. In the figure, 1 is the input optical fiber, 2 is the polarization plane rotation mechanism, and 3 is the input optical fiber.
is an absolute single polarization fiber coupler, 4 is an optical detector,
5 is a rotation control interface, 6 is a core, 7 is a cladding, 8 is a jacket, 9 is a support, 10 is an absolutely single polarization fiber, 11 is a quartz substrate, 12 is a 172 wavelength plate, 1
3 is a lens, 14 is a rotary drive device, 15 is a variable current source,
16 is a Faraday element.
Claims (1)
射される偏光の偏波面を回転制御する偏波面回転制御手
段を設け、上記カプラーの２つの出力端子のうちの１方
の出力を検出器で検出してその検出値を最大にするよう
に上記偏波面回転制御手段により入射される偏光の回転
制御を行うことを特徴とする偏光コントローラ。A polarization plane rotation control means for controlling the rotation of the polarization plane of the incident polarized light is provided in front of the input terminal of the absolute single polarization fiber coupler, and the output of one of the two output terminals of the coupler is detected. A polarization controller characterized in that the rotation of the incident polarized light is controlled by the polarization plane rotation control means so as to maximize the detected value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26985787A JPH01112219A (en) | 1987-10-26 | 1987-10-26 | Polarization controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26985787A JPH01112219A (en) | 1987-10-26 | 1987-10-26 | Polarization controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01112219A true JPH01112219A (en) | 1989-04-28 |
Family
ID=17478166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26985787A Pending JPH01112219A (en) | 1987-10-26 | 1987-10-26 | Polarization controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01112219A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016008981A (en) * | 2014-06-20 | 2016-01-18 | 日本電信電話株式会社 | Polarization control element |
| JP2016008982A (en) * | 2014-06-20 | 2016-01-18 | 日本電信電話株式会社 | Polarization control element |
-
1987
- 1987-10-26 JP JP26985787A patent/JPH01112219A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016008981A (en) * | 2014-06-20 | 2016-01-18 | 日本電信電話株式会社 | Polarization control element |
| JP2016008982A (en) * | 2014-06-20 | 2016-01-18 | 日本電信電話株式会社 | Polarization control element |
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