JPH02129603A - Optical attenuator - Google Patents
Optical attenuatorInfo
- Publication number
- JPH02129603A JPH02129603A JP63282324A JP28232488A JPH02129603A JP H02129603 A JPH02129603 A JP H02129603A JP 63282324 A JP63282324 A JP 63282324A JP 28232488 A JP28232488 A JP 28232488A JP H02129603 A JPH02129603 A JP H02129603A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- loss
- bobbin
- diameter
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 10
- 238000005253 cladding Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 208000014733 refractive error Diseases 0.000 description 1
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
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はたアッテネータに関し、特にたファイバー自体
によシ所要損失を得るタイプの尤アッテネータに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an attenuator, and more particularly to an attenuator of the type in which the required loss is obtained by means of the fiber itself.
従来、この種の九アッテネータとしては、所要の減設置
を得るため、２本のｙｔ、７アイパをつき合わせ、その
間の空隙による損失を利用するギャップ形、２本のファ
イバのつき合せ面に減衰膜をはさみこむ減衰膜形もしく
は２本のファイバをＸ形に組合せてクロス点を融着する
融着形叫が実用化されている。また、たアッテネータに
尤ファイバを用いたものとしては、金属コーティングフ
ァイバを用いたもの（昭６２−２７３５０２ ）がある
。Conventionally, in order to obtain the required reduction in installation, this type of 9-attenuator has a gap type, in which two yt, 7-eyepers are butted together and the loss due to the gap between them is utilized, and the attenuation is applied to the butting surface of the two fibers. A damping film type in which a membrane is sandwiched, or a fused type in which two fibers are combined in an X shape and the cross points are fused has been put into practical use. Further, as an attenuator using a magnetic fiber, there is one using a metal coated fiber (Sho 62-273502).
上述した従来の光アッテネータは、ギャップ形ではギャ
ップ間隔調整および長期間にわたるギャップ位置関係の
保持の困難、減衰膜形では減衰膜自体の作成が困難でか
つつき合わせ面の機械的位置関係の決定およびその長期
間にわたる保持の困蒲、Ｒ着形では融着時に損失をコン
トロールすることの困難等があり、いずれも簡易に所要
の光損失を得る目的に対しては欠点となっていた。また
、金属コートファイバは単位長１の損失が比較的少なく
、５〜６ｄＢ／’ｋｍであり、また高価であるという欠
点を有していた。With the above-mentioned conventional optical attenuators, it is difficult to adjust the gap spacing and maintain the gap position over a long period of time in the gap type, and it is difficult to create the attenuation film itself in the attenuating film type, and it is difficult to determine the mechanical positional relationship of the abutting surfaces. There are difficulties in maintaining it for a long period of time, and difficulty in controlling loss during fusion in the case of R-type, both of which are drawbacks for the purpose of easily obtaining the required optical loss. Further, metal coated fibers have the drawbacks of relatively low loss per unit length of 5 to 6 dB/'km, and are expensive.
〔１％！題を解決するための手段〕
本発明の光アッテネータは、前述した従来の問題を改善
するためになされたものであり、光ファイバを細径のボ
ビンに巻きつけた構造を有して構成されている。[1%! Means for Solving the Problems] The optical attenuator of the present invention has been made in order to improve the above-mentioned conventional problems, and has a structure in which an optical fiber is wound around a small diameter bobbin. There is.
本発明においては、光７アイバが細径のボビンに巻かれ
ることにより、クラッドによる光とじこめ効果が劣化し
、光伝送損失が増加して減衰量が得られる。In the present invention, by winding the optical fiber on a bobbin with a small diameter, the light confinement effect by the cladding is degraded, the optical transmission loss increases, and an attenuation amount is obtained.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
図は本発明による光アッテネータの一実施例を示す斜視
図である。図において、１１１：細径のボビン、２はこ
のボビン１の外周面に巻き付けられた光ファイバである
。The figure is a perspective view showing one embodiment of the optical attenuator according to the present invention. In the figure, 111 is a small-diameter bobbin, and 2 is an optical fiber wound around the outer peripheral surface of the bobbin 1.
一般にたファイバは、細径に巻かれると、クラッドによ
る光とじこめ効果が劣化し、光伝送損失が増加する。巻
き径と損失との関係は、一般に′＃。Generally, when a fiber is wound to a small diameter, the light confinement effect by the cladding deteriorates and optical transmission loss increases. The relationship between winding diameter and loss is generally '#.
ファイバの構造寸法、比屈折真差（△）等によシ異なる
が、通常のシリカコアシングルモード光ファイバの場合
、直径２０ｍｍφのボビンに巻いた場合に１巻き当り約
０．０６３ｄＢ （１ｄＢ／ｍに和尚）から ０．６３
ｄＢ （１０ｄＢ／ｍ Ｋ相当）程度の損失とがる。It varies depending on the structural dimensions of the fiber, the relative refractive error (△), etc., but in the case of a normal silica core single mode optical fiber, when wound on a bobbin with a diameter of 20 mmφ, the power per turn is approximately 0.063 dB (1 dB/m 0.63
The loss is about dB (equivalent to 10 dB/m K).
したがって所要の減衰量を得られるまで光ファイバ２を
ボビン１に巻きつけることにより容易に尤アッテネータ
が実現できる。この場合、光損失を測定しつつ、巻き数
を調整することによシ、減衰量の微細な調整を行なうこ
とができる。Therefore, an attenuator can be easily realized by winding the optical fiber 2 around the bobbin 1 until the required amount of attenuation is obtained. In this case, the amount of attenuation can be finely adjusted by adjusting the number of turns while measuring the optical loss.
高い損失を少ない巻き数で簀現するには、曲げ損失の大
きい（Δの小さい）光ファイバを使用することになる。In order to achieve high loss with a small number of turns, an optical fiber with high bending loss (small Δ) is used.
以上説明したように本発明に尤アッテネータは、たファ
イバを細径の・ドビンに巻きつけることＫより構成した
ので、クラッドからの放射損失およびマイクロベンディ
ング損失を増加させ、その損失増加を利用することによ
シ、元アッテネータを実現できる。この光アッテネータ
はギャップ保持。As explained above, since the attenuator of the present invention is constructed by winding the fiber around a small diameter dobbin, the radiation loss and microbending loss from the cladding are increased, and the increased loss can be utilized. It is possible to realize a former attenuator. This optical attenuator maintains a gap.
減り嘆の必要が彦いため、実現が容易であり、ファイバ
断線以外の故障モードが無いため、ボビンへの巻きつけ
応力を小さくして製作すれば、極めて高信頼度の尤アッ
テネータとなる。また、ボビン径と巻きつけ回数を選べ
ば異なる減衰量の各種の大きさの光アッテネータが実現
できるという極めて優れた効果が得られる。It is easy to implement because there is no need to reduce the amount of wear and tear, and there is no failure mode other than fiber breakage, so if the winding stress around the bobbin is reduced and the attenuator is manufactured, it becomes an extremely reliable attenuator. Further, by selecting the bobbin diameter and the number of windings, it is possible to realize optical attenuators of various sizes with different attenuation amounts, which is an extremely excellent effect.
図は本発明による尤アッテネータの一実施例を示す斜視
図である。
１・・・Φボビン、２・・・１１タフアイバ。The figure is a perspective view showing an embodiment of the attenuator according to the present invention. 1...Φ bobbin, 2...11 Tough Aiba.
Claims (1)
とした光アツテネータ。An optical attenuator characterized by winding an optical fiber around a small diameter bobbin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63282324A JPH02129603A (en) | 1988-11-10 | 1988-11-10 | Optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63282324A JPH02129603A (en) | 1988-11-10 | 1988-11-10 | Optical attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02129603A true JPH02129603A (en) | 1990-05-17 |
Family
ID=17650933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63282324A Pending JPH02129603A (en) | 1988-11-10 | 1988-11-10 | Optical attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02129603A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6572830B1 (en) | 1998-10-09 | 2003-06-03 | Motorola, Inc. | Integrated multilayered microfludic devices and methods for making the same |
-
1988
- 1988-11-10 JP JP63282324A patent/JPH02129603A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6572830B1 (en) | 1998-10-09 | 2003-06-03 | Motorola, Inc. | Integrated multilayered microfludic devices and methods for making the same |
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