JPS61134641A - Method for measuring extinction ratio of constant polarization fiber - Google Patents
Method for measuring extinction ratio of constant polarization fiberInfo
- Publication number
- JPS61134641A JPS61134641A JP25790184A JP25790184A JPS61134641A JP S61134641 A JPS61134641 A JP S61134641A JP 25790184 A JP25790184 A JP 25790184A JP 25790184 A JP25790184 A JP 25790184A JP S61134641 A JPS61134641 A JP S61134641A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- light
- mode
- extinction ratio
- mode field
- 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
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
- G01M11/337—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 by measuring polarization dependent loss [PDL]
Landscapes
- 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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光通信分野に於いてシングルモードファイバか
ら出射された或る角度の偏波成分のパワーの測定に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to measuring the power of a polarized wave component at a certain angle emitted from a single mode fiber in the field of optical communications.
シングルモードファイバから出射された或る角度の偏波
成分のパワーを測定する場合、主とじて該ファイバのモ
ードフィールド部以外から出た基本モード（ＨＥＩＩ）
以外の光成分の影響を受けて消光比の測定が正確に出来
ないと云う問題があり、此の改善が強く望まれていた。When measuring the power of a polarized wave component at a certain angle emitted from a single mode fiber, the fundamental mode (HEII) emitted from a region other than the mode field of the fiber is mainly measured.
There is a problem in that the extinction ratio cannot be measured accurately due to the influence of other light components, and there has been a strong desire to improve this.
第２図は従来の定偏波ファイバ消光比測定法の一例を示
す図である。FIG. 2 is a diagram showing an example of a conventional polarization constant fiber extinction ratio measurement method.
図中、１は試料ファイバ、２はレンズ、３は検光子、４
はレンズ、５は光検知器である。尚以下全図を通じ同一
記号は同一対象物を表す。In the figure, 1 is the sample fiber, 2 is the lens, 3 is the analyzer, and 4
is a lens, and 5 is a photodetector. The same symbols represent the same objects throughout all the figures below.
従来定偏波ファイバの消光比を測定するには、試料ファ
イバｌ （シングルモードファイバ）の一端から主軸方
向に直線偏波光を入射し、他端から出る出射光の偏光度
を測定する。To measure the extinction ratio of a conventional polarization-constant fiber, linearly polarized light is input from one end of the sample fiber l (single mode fiber) in the principal axis direction, and the degree of polarization of the output light from the other end is measured.
此の偏光度を消光比と云っている。This degree of polarization is called the extinction ratio.
此の様に試料ファイバ１から出射された光の内、或る角
度の偏波成分のみのパワーを測定する従来の方法を以下
に示す。A conventional method for measuring the power of only the polarized component at a certain angle of the light emitted from the sample fiber 1 will be described below.
第２図に示す様に試料ファイバ１ （シングルモードフ
ァイバ旬から出射された光をレンズ２により平行光線と
して検光子３に投光する。As shown in FIG. 2, the light emitted from the sample fiber 1 (single mode fiber) is projected onto an analyzer 3 as parallel light by a lens 2.
検光子３は特定の角度の偏波成分の光のみを取り出すも
ので、此の検光子３により或る偏光成分のみを取り出し
、此れを再びレンズ４により集光して試料ファイバ１の
モードフィールド径に比し大口径の光検知器５で受光し
、其のパワーを測定する方法が採られていた。尚モード
フィールド部とはＨＥ ＋ ＋モードが伝搬する領域で
ある。The analyzer 3 extracts only light with a polarized component at a specific angle. This analyzer 3 extracts only a certain polarized component, which is then focused again by a lens 4 to determine the mode field of the sample fiber 1. A method has been adopted in which the light is received by a photodetector 5 having a large diameter compared to the diameter, and the power of the light is measured. Note that the mode field portion is a region where the HE + + mode propagates.
然しなから上記従来方法では試料ファイバ１のＨＥ ＋
１モード以外の光、例えばクラッド部から伝わって来
た光も大口径の光検知器５で受光されるので、試料ファ
イバ１のＨＥ、、モードの偏波状態とは違う値を測定す
ることになる。However, in the above conventional method, the HE + of sample fiber 1
Since light other than mode 1, for example light transmitted from the cladding section, is also received by the large-diameter photodetector 5, a value different from the polarization state of the HE mode of the sample fiber 1 is measured. Become.
従って試料ファイバ１のモードフィールド部を伝わって
来たＨＥ、、モード光の偏光度を正確に測定出来ない。Therefore, the degree of polarization of the HE mode light transmitted through the mode field portion of the sample fiber 1 cannot be accurately measured.
例えば、試料ファイバ１のＨＥ Ｉｔモード光の偏波状
態を、Ｘ軸方向の成分をＥ、ｌ、Ｙ軸方向の成分をＥＹ
とし、ＥＸ＝Ｅ、Ｉｏ 、ＥＶ＝Ｅｙ０ とする。 但
しＥ、Ｉｏ 〉Ｅｙｏ とする。For example, for the polarization state of the HE It mode light of sample fiber 1, the component in the X-axis direction is E, l, and the component in the Y-axis direction is EY.
Let EX=E, Io, EV=Ey0. However, E, Io > Eyo.
ＨＥ、、モード以外、例えばクラッド部を伝わる光の偏
波状態を、Ｅｘ ” ＥＸｏ’ 、ＥＹ ＝ Ｅｙｏ’
とする。HE,,For example, the polarization state of light traveling through the cladding is expressed as Ex ” EXo', EY = Eyo'
shall be.
勿論、Ｅ、、’ 、Ｅｙ、’ は何れもＥえ。に比し、
格段と小さい値である。Of course, E,,',Ey,' are all Ee. Compared to
This is a much smaller value.
此の場合ＨＥ、、モード光の偏光度Ｐは、である。In this case, HE, the polarization degree P of the mode light is.
然しモードフィールド部以外を伝わる光も受ける為Ｅｘ
、Ｅｙとも少し変わり、偏光度も変化する。此の場合
の偏光度Ｐ′は下式の様になる。However, since it also receives light transmitted through areas other than the mode field, Ex
, Ey, and the degree of polarization also changes. In this case, the degree of polarization P' is expressed by the following formula.
但し、光フアイバ内を伝搬する光はインコーヒレントと
した。However, the light propagating within the optical fiber was assumed to be incoherent.
以上説明したように従来の測定方法ではモードフィール
ド部以外を伝わる光の影響を受けて、正確な偏光度を測
定出来ないと云う欠点があった。As explained above, the conventional measurement method has the disadvantage that it is not possible to accurately measure the degree of polarization due to the influence of light transmitted outside the mode field section.
本発明の目的は上記従来方式の欠点を除去し、コア以外
を伝わる光の影響を受けない定偏波ファイバ消光比測定
法を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional methods and to provide a method for measuring extinction ratio of a constant polarization fiber that is not affected by light transmitted through areas other than the core.
Ｃ問題点を解決するための手段〕
問題点を解決するための手段は、シングルモードファイ
バから出射された或る角度の偏波成分のパワーを測定す
るシステムに於いて、前記ファイバから出射された光の
うち或る方向の偏光を取り出した後、前記偏光を前記フ
ァイバのモードフィールド径以下のモードフィールド径
を有し、且つクラッドモードを除去する機能を備えたフ
ァイバで受光し、其の入射光のパワーを測定することに
より達成される。Means for Solving Problem C] Means for solving the problem is, in a system that measures the power of a polarized wave component at a certain angle emitted from a single mode fiber. After extracting polarized light in a certain direction from the light, the polarized light is received by a fiber having a mode field diameter smaller than or equal to the mode field diameter of the fiber and having a function of removing the cladding mode, and the incident light is This is achieved by measuring the power of
本発明に依ると、シングルモードファイバから出射され
た或る角度の偏波成分を取り出した後、・前記ファイバ
のモードフィールド径以下のモードフィールド径を有す
るクラッドモードを除去する機能を備えたファイバで受
けるので真にシングルモードファイバのモードフィール
ド部から出射された光成分のみを測定出来ると云う効果
が生まれる。According to the present invention, after extracting a polarized wave component at a certain angle emitted from a single mode fiber, the fiber is Therefore, it is possible to truly measure only the light component emitted from the mode field portion of the single mode fiber.
第１図は本発明に依る定偏波ファイバ消光比測定法の一
実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the polarization constant fiber extinction ratio measurement method according to the present invention.
図中、６は本発明に依る受光ファイバである。In the figure, 6 is a light receiving fiber according to the present invention.
以下図に従って本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
本発明に依る測定方法は従来の技術の項で説明した従来
方法と同じ操作を行う。然し本発明では光検知器５の前
に受光ファイバ６を使用する点が異なる。The measuring method according to the invention performs the same operations as the conventional method described in the prior art section. However, the present invention differs in that a light receiving fiber 6 is used before the photodetector 5.
本発明に於いて使用される受光ファイバ６は試料ファイ
バ１のモードフィールド径以下のモードフィールド径を
有し、且つクラッドモードを除去する機能を備えた受光
ファイバである。The light-receiving fiber 6 used in the present invention has a mode field diameter smaller than the mode field diameter of the sample fiber 1, and has a function of removing cladding modes.
従って試料ファイバｌのモードフィールド部以外を伝搬
して来た光は受光ファイバ６のモードフィールド部には
入射しない。Therefore, the light that has propagated outside the mode field section of the sample fiber 1 does not enter the mode field section of the light receiving fiber 6.
然るに受光ファイハロはクラッドモードを除去する機能
を備えた受光ファイバであるので、此の光は伝わらない
。此の為受光ファイバ６の出口に設けられたパワーメー
ターは試料ファイバ１のＨＥ、モード光のみの光パワー
を測定することが可能である。However, since the light-receiving fiber halo is a light-receiving fiber with a function of removing the cladding mode, this light is not transmitted. For this reason, the power meter provided at the exit of the light receiving fiber 6 can measure the optical power of only the HE mode light of the sample fiber 1.
以上詳細に説明した様に本発明によれば、試料ファイバ
の基本モード以外の光成分を大幅に除去出来るので正確
に定偏波ファイバの消光比を測定出来ると云う大きい効
果がある。As explained in detail above, according to the present invention, optical components other than the fundamental mode of the sample fiber can be largely removed, so that the extinction ratio of the polarization constant fiber can be accurately measured.
第１図は本発明に依る定偏波ファイバ消光比測定法の一
実施例を示す図である。
第２図は従来の定偏波ファイバ消光比測定法の一例を示
す図である。
図中、■は試料ファイバ、２はレンズ、３は検光子、４
はレンズ、５は光検知器、６は本発明に依る受光ファイ
バである。
３Ｐ １ 囚FIG. 1 is a diagram showing an embodiment of the polarization constant fiber extinction ratio measurement method according to the present invention. FIG. 2 is a diagram showing an example of a conventional polarization constant fiber extinction ratio measurement method. In the figure, ■ is the sample fiber, 2 is the lens, 3 is the analyzer, and 4
5 is a lens, 5 is a photodetector, and 6 is a light receiving fiber according to the present invention. 3P 1 Prisoner
Claims (1)
成分のパワーを測定するシステムに於いて、前記ファイ
バから出射された光のうち或る方向の偏光を取り出した
後、前記偏光を前記ファイバのモードフィールド径以下
のモードフィールド径を有し、且つクラッドモードを除
去する機能を備えたファイバで受光し、其の入射光のパ
ワーを測定することを特徴とする定偏波ファイバ消光比
測定法。In a system that measures the power of a polarized component at a certain angle emitted from a single mode fiber, after extracting polarized light in a certain direction from the light emitted from the fiber, the polarized light is converted to the mode of the fiber. A constant polarization fiber extinction ratio measurement method characterized by receiving light with a fiber having a mode field diameter smaller than the field diameter and having a function of removing a cladding mode, and measuring the power of the incident light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25790184A JPS61134641A (en) | 1984-12-06 | 1984-12-06 | Method for measuring extinction ratio of constant polarization fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25790184A JPS61134641A (en) | 1984-12-06 | 1984-12-06 | Method for measuring extinction ratio of constant polarization fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61134641A true JPS61134641A (en) | 1986-06-21 |
Family
ID=17312760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25790184A Pending JPS61134641A (en) | 1984-12-06 | 1984-12-06 | Method for measuring extinction ratio of constant polarization fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61134641A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002059665A3 (en) * | 2001-01-24 | 2003-02-20 | Adc Telecommunications Inc | Mems optical switch including tapered fiber with hemispheric lens |
| CN102183360A (en) * | 2011-03-04 | 2011-09-14 | 天津大学 | Method and device for detecting polarization extinction ratio of optical polarizer |
| CN105865747A (en) * | 2016-03-24 | 2016-08-17 | 山东理工大学 | Multi-channel extinction ratio detection device |
| CN113422282A (en) * | 2021-08-24 | 2021-09-21 | 中国工程物理研究院激光聚变研究中心 | Preparation method of all-fiber self-imaging laser beam combiner |
-
1984
- 1984-12-06 JP JP25790184A patent/JPS61134641A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002059665A3 (en) * | 2001-01-24 | 2003-02-20 | Adc Telecommunications Inc | Mems optical switch including tapered fiber with hemispheric lens |
| CN102183360A (en) * | 2011-03-04 | 2011-09-14 | 天津大学 | Method and device for detecting polarization extinction ratio of optical polarizer |
| CN105865747A (en) * | 2016-03-24 | 2016-08-17 | 山东理工大学 | Multi-channel extinction ratio detection device |
| CN113422282A (en) * | 2021-08-24 | 2021-09-21 | 中国工程物理研究院激光聚变研究中心 | Preparation method of all-fiber self-imaging laser beam combiner |
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