JPS6168532A - Spot size measurement for optical fiber - Google Patents
Spot size measurement for optical fiberInfo
- Publication number
- JPS6168532A JPS6168532A JP18972384A JP18972384A JPS6168532A JP S6168532 A JPS6168532 A JP S6168532A JP 18972384 A JP18972384 A JP 18972384A JP 18972384 A JP18972384 A JP 18972384A JP S6168532 A JPS6168532 A JP S6168532A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- light
- fiber
- spot size
- probe
- 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
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）
本発明の光ファイバのスポットサイズ測定方法は、光フ
ァイバ端面の寸法を測定するものであり、特にシングル
モード光ファイバの寸法測定に使用するのに適するもの
である。Detailed Description of the Invention (Industrial Application Field) The optical fiber spot size measuring method of the present invention measures the dimensions of the end face of an optical fiber, and is particularly suitable for measuring the dimensions of a single mode optical fiber. It is suitable for
（従来の技術）
光ファイバのスポットサイズは、光ファイバ端面の光強
度分布（第２図）のうち光強度が最大である中心点Ｏか
ら光強度が最大値のｌ ／ ｅに減少する点Ｐまでの半
径である。(Prior art) The spot size of an optical fiber is defined as the point P where the light intensity decreases from the center point O where the light intensity is maximum to the maximum value l/e in the light intensity distribution at the end face of the optical fiber (Fig. 2). The radius is up to.
このスポットサイズの測定方法にはニアフィールドパタ
ーン法（ＮＦＰ法）がある。これは光ファイバの光強度
分布を顕微鏡で拡大し、それをテレビカメラを通してス
ポットサイズを測定する方法である。There is a near field pattern method (NFP method) as a method for measuring this spot size. This is a method of magnifying the light intensity distribution of an optical fiber using a microscope and measuring the spot size using a television camera.
（発明が解決しようとする問題点）
ＮＦＰ法はテレビカメラを使用するため受光感度むら、
位置歪、暗電流、ブルーミング（にじみ出し）等の問題
があるため測定値が不正確であるという問題があった。(Problems to be solved by the invention) Since the NFP method uses a television camera, there is unevenness in light reception sensitivity.
There was a problem in that the measured values were inaccurate due to problems such as positional distortion, dark current, and blooming.
また従来はスポットサイズの測定にＦＦＰ法を使用する
こともおこなわれていたが、これはモードパターンを直
接測定できないという問題がある。Furthermore, conventionally, the FFP method has been used to measure the spot size, but this method has a problem in that the mode pattern cannot be directly measured.
（問題点を解決するための手段）
本発明はＮＦＰ法における測定誤差の要因となるテレビ
カメラを使用せずに、ファイバプローブと直線性の良い
検出器の組合せにより測定するようにしたものである。(Means for Solving the Problems) The present invention uses a combination of a fiber probe and a detector with good linearity to perform measurements without using a television camera, which causes measurement errors in the NFP method. .
本発明の方法は、光ファイバの端面をレンズで拡大して
結像させ、この像を光ファイバプローブで検出すると共
に光ファイバプローブの位置を移動させることによって
光ファイバ端面の各位置の光分４ｊ強度を測定するよう
にしたものである。The method of the present invention magnifies the end face of an optical fiber with a lens to form an image, detects this image with an optical fiber probe, and moves the position of the optical fiber probe, thereby obtaining light components 4j at each position on the end face of the optical fiber. It is designed to measure strength.
その−例として第１図に示すものは次のようにしである
。The example shown in FIG. 1 is as follows.
Ｌ Ｅ Ｄ又はＬＤ等の光源ｌからの出力を、片端コネ
クタイζＩきピッグテールファイバ２で導き、このファ
イバ２をＶ溝連結具３により被測定ファイバ４と接続す
る。The output from a light source l such as LED or LD is guided through a pigtail fiber 2 with a connector at one end ζI, and this fiber 2 is connected to a fiber to be measured 4 through a V-groove connector 3.
被測定ファイバ４の多端はＸＹＺ微調台５のステージに
セットシ、接眼レンズ１３によってモニタしてピントを
合せる。The other end of the fiber 4 to be measured is set on a stage of an XYZ fine adjustment table 5, and is monitored and focused by an eyepiece 13.
レンズ７．８により結像された位置に光ファイバプロー
ブ９を設置し、この光ファイバプローブ９の受光端側を
中央演算処理装置（ＣＰＵ）１２でコントロールされる
ＣＰＵコントロール微動台６によりＸＹ軸の２軸に動か
し′て、拡大された像の各位置の光をスポット的に順次
取出して検出する。An optical fiber probe 9 is installed at the position imaged by the lens 7.8, and the light receiving end side of the optical fiber probe 9 is moved along the XY axes by a CPU control fine movement table 6 controlled by a central processing unit (CPU) 12. By moving it along two axes, light from each position of the enlarged image is sequentially extracted and detected in spots.
ファイバプローブ９の多端はディテクタｌＯに接続し、
これで検出されてた光をロックインアンプ１１を通して
中央演算処理装置（ＣＰＵ）１２に入力Ｓせ、光ファイ
バプローブ９で検出した各位置の光レベルをこのＣＰＵ
で演算処理して光シングルモードファイバのモードパタ
ーンをＪｌｌ定する。The other end of the fiber probe 9 is connected to the detector lO,
The detected light is now input to the central processing unit (CPU) 12 through the lock-in amplifier 11, and the light level at each position detected by the optical fiber probe 9 is input to the central processing unit (CPU) 12.
The mode pattern of the optical single mode fiber is determined by performing calculation processing.
第１図のファイバプローブ９としては開口比ＮＡが０１
５５、コア径が１１０ｇｍ程度の高ＮＡの光ファイバを
使用するのがよい。The fiber probe 9 in FIG. 1 has an aperture ratio NA of 01.
55. It is preferable to use a high NA optical fiber with a core diameter of about 110 gm.
ディテクタ１０としては熱雑音を下げるため液体窒素で
冷却されたゲルマニュウムデイテクタを使用するのがよ
い。As the detector 10, it is preferable to use a germanium detector cooled with liquid nitrogen in order to reduce thermal noise.
第１図の１４はハーフミラ−である。14 in FIG. 1 is a half mirror.
（発明の効果）
本発明は以−１−のようにしてなるため次のような各種
効果がある。(Effects of the Invention) Since the present invention is constructed as described below-1-, it has the following various effects.
（１）テレビカメラを使用しないため、テレビカメラを
使用する場合の各種欠点である直線性、位置歪、ｎ１２
電流、プルーミング等が全て解消され、そのためシンプ
ルモードファイバの光強度分布を１確に測定することが
できる。(1) Since a TV camera is not used, there are various drawbacks when using a TV camera such as linearity, position distortion, n12
Current, pluming, etc. are all eliminated, and therefore the light intensity distribution of the simple mode fiber can be accurately measured.
（２）光ファイバプローブと直線性の良いディテクタの
紹合せにより測定するものであるため高精度の１１１１
定ができる。(2) Highly accurate 1111 because the measurement is performed by introducing an optical fiber probe and a detector with good linearity.
can be determined.
第１図はシンプルモードファイバのスポットサイズ測定
装置の一例を概略図、第２図はスポットサイズの説明図
である。
４は被測定ファイバ、
６はＣＰＵコントロール微調合、
７は対物レンズ
８は接眼レンズ、
９は光ファイバプローブ
１０はディテクタ、
１２は中央演算処理装置FIG. 1 is a schematic diagram of an example of a spot size measuring device for a simple mode fiber, and FIG. 2 is an explanatory diagram of the spot size. 4 is a fiber to be measured, 6 is a CPU control fine adjustment, 7 is an objective lens 8 is an eyepiece, 9 is an optical fiber probe 10 is a detector, 12 is a central processing unit
Claims (1)
光強度を検出する光ファイバプローブを移動させて光強
度分布における各位置の光強度を検出し、この検出デー
タから中央演算処理装置でスポットサイズを求めるよう
にしたことを特徴とする光ファイバのスポットサイズ測
定方法。The light intensity distribution on the end face of the optical fiber is expanded using a lens,
An optical fiber spot characterized in that an optical fiber probe for detecting light intensity is moved to detect the light intensity at each position in the light intensity distribution, and a central processing unit calculates the spot size from this detected data. Size measurement method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18972384A JPS6168532A (en) | 1984-09-12 | 1984-09-12 | Spot size measurement for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18972384A JPS6168532A (en) | 1984-09-12 | 1984-09-12 | Spot size measurement for optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6168532A true JPS6168532A (en) | 1986-04-08 |
Family
ID=16246109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18972384A Pending JPS6168532A (en) | 1984-09-12 | 1984-09-12 | Spot size measurement for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6168532A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01134225A (en) * | 1987-11-20 | 1989-05-26 | Nippon Telegr & Teleph Corp <Ntt> | Mode field diameter measuring instrument for single mode optical fiber |
| JPH01295529A (en) * | 1988-05-23 | 1989-11-29 | Nec Corp | Integrated circuit with switching clock |
| WO2002059665A3 (en) * | 2001-01-24 | 2003-02-20 | Adc Telecommunications Inc | Mems optical switch including tapered fiber with hemispheric lens |
| CN105092218A (en) * | 2015-09-10 | 2015-11-25 | 安徽华夏显示技术股份有限公司 | Test device for striped glass screens |
-
1984
- 1984-09-12 JP JP18972384A patent/JPS6168532A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01134225A (en) * | 1987-11-20 | 1989-05-26 | Nippon Telegr & Teleph Corp <Ntt> | Mode field diameter measuring instrument for single mode optical fiber |
| JPH01295529A (en) * | 1988-05-23 | 1989-11-29 | Nec Corp | Integrated circuit with switching clock |
| WO2002059665A3 (en) * | 2001-01-24 | 2003-02-20 | Adc Telecommunications Inc | Mems optical switch including tapered fiber with hemispheric lens |
| CN105092218A (en) * | 2015-09-10 | 2015-11-25 | 安徽华夏显示技术股份有限公司 | Test device for striped glass screens |
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