JPS61285427A - Optical attenuator - Google Patents
Optical attenuatorInfo
- Publication number
- JPS61285427A JPS61285427A JP12858185A JP12858185A JPS61285427A JP S61285427 A JPS61285427 A JP S61285427A JP 12858185 A JP12858185 A JP 12858185A JP 12858185 A JP12858185 A JP 12858185A JP S61285427 A JPS61285427 A JP S61285427A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- crystal film
- input
- optical fiber
- 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
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光減衰器、特に、光の減衰を離散的および精密
に制御できる光減衰器ｖｃｒ！Ａするう〔従来の技術〕
従来の光減衰器は金属膜を使用して固定的に光を減衰さ
せる方法や、機械的に光を遮って段階的に減衰させる方
法、さらに電圧を加えることに工り光を偏向させること
のできる素子を使用して光を連続的に減衰させる方法等
により実現されていた。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical attenuator, particularly an optical attenuator VCR that can discretely and precisely control the attenuation of light. A [Conventional technology] Conventional optical attenuators use a method to attenuate light in a fixed manner using a metal film, a method to attenuate the light in stages by mechanically blocking the light, and a method to attenuate the light in stages by applying a voltage. This was achieved by continuously attenuating the light using an element that can deflect the artificial light.
し返しながら、このような従来の光減衰器は機ため減衰
の制御が複雑になるという欠点があった。However, such conventional optical attenuators have the disadvantage that control of attenuation is complicated.
本発明の光減衰器は（ｎ十”）λ（ｎは整数０，１゜２
・・・・・・、λは波長を表す）の長さのロッドレンズ
２個と、その間ＩＣＨさまれた外部からの電気信号で制
御される液晶を含む液晶フィルム仁、２個のロッドレン
ズに接続される入力および出力用の光ファイバとから構
成される。The optical attenuator of the present invention is (n0'')λ (n is an integer 0, 1°2
......, 2 rod lenses with a length of It consists of connected input and output optical fibers.
次に１本発明の実施例について、図面を参照して説明す
る。Next, an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
第１図に示す光減衰器は入力用の元ファイバケズと、液
晶およびその動作を制御する電圧を与える透明電極から
なる液晶フィルム３と、長さが用の元ファイバーケーブ
ル５と、液晶フィルム３を制御するための液晶フィルム
制御回路６とを含んで構成される。The optical attenuator shown in Fig. 1 consists of an original fiber for input, a liquid crystal film 3 consisting of a transparent electrode that provides a voltage to control the liquid crystal and its operation, an original fiber cable 5 with a length of 1, and a liquid crystal film 3. It is configured to include a liquid crystal film control circuit 6 for controlling.
次に、Ｉ！１図および第２図を参照して、本発明の実施
例の動作を説明する。Next, I! The operation of the embodiment of the present invention will be described with reference to FIGS. 1 and 2.
入力用の元ファイバーケーブル１から入ってきり元ハロ
ッドレンズ２によりその光束を拡大される。拡大された
光束は液晶フィルム３を透過してロッドレンズ４１Ｃ入
るが、この際液晶フィルム３により制御され必要な元だ
けが透過する。液晶フィルム３を透過し、ロッドレンズ
４により集光された光が光ファイバケーブル５を通して
出力される。液晶フィルム３の液晶３′はセグメント毎
に液晶フィルム制御回路６Ｖｃエク制御され離散的（デ
ィジタル式）に液晶３′を通る透過光を減衰させること
ができる。The light beam enters from an input fiber cable 1 and is expanded by a Harrod lens 2. The expanded light flux passes through the liquid crystal film 3 and enters the rod lens 41C, but at this time it is controlled by the liquid crystal film 3 and only the necessary components are transmitted. Light transmitted through the liquid crystal film 3 and collected by the rod lens 4 is outputted through the optical fiber cable 5. The liquid crystal 3' of the liquid crystal film 3 is controlled segment by segment by a liquid crystal film control circuit 6Vc, so that the transmitted light passing through the liquid crystal 3' can be discretely (digitally) attenuated.
第２図は第１図に示す実施例の減衰時の一例を示す模式
図である。 ′
液晶３′は液晶フィルム制御回路６ｖｃ！！！１１その
半分が不透明となった液晶フィルム３の状態を示したも
のである。この場合、元ファイバケーブル１から入力し
た光は半分以下に減衰され出力光は入力の半分以下の光
量となる。FIG. 2 is a schematic diagram showing an example of the embodiment shown in FIG. 1 at the time of attenuation. 'Liquid crystal 3' is liquid crystal film control circuit 6vc! ! ! 11 shows the state of the liquid crystal film 3, half of which is opaque. In this case, the light input from the original fiber cable 1 is attenuated to less than half, and the output light becomes less than half the amount of input light.
本発明の光減衰器１ＩＣｎ十−）λの長さのロッドレン
ズ２個、液晶フィルムおよび液晶を制御するための液晶
フィルム制御回路を設けたことにより、１カ細かい光減
衰の制御を離散的に行なうことができるため、より精密
な計測、測定ｒｃｚ用でき、さらに光減衰量の制御を簡
単に実現できるとともに、構造が簡単なため安価に製造
できるという効果がある。The optical attenuator of the present invention is provided with two rod lenses each having a length of 1 ICn-)λ, a liquid crystal film, and a liquid crystal film control circuit for controlling the liquid crystal, so that fine control of optical attenuation can be performed discretely. Therefore, it is possible to perform more precise measurement and measurement rcz, and furthermore, it is possible to easily control the amount of optical attenuation, and because the structure is simple, it can be manufactured at low cost.
第１図は本発明の一実施例を示すブロック図、第２図に
ｇ１図に示す実施例における光減衰動作を説明するため
の模式図である。
１・・・・・・元ファイバケーブル、２・・・・・・ロ
ッドレンズ、３・・・・・・液晶フィルム、４・・・・
・・口・ラドレンズ、５・・・・・・光ファイバケーブ
ル、６・・・・・・液晶フィルム制＠回路、３′・・・
・・・液晶。
第 ２ 図FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a schematic diagram for explaining the light attenuation operation in the embodiment shown in diagram g1. 1... Original fiber cable, 2... Rod lens, 3... Liquid crystal film, 4...
... Mouth Rad lens, 5 ... Optical fiber cable, 6 ... Liquid crystal film system @ circuit, 3' ...
···liquid crystal. Figure 2
Claims (1)
出力光用の一対のロッドレンズと、前記一対のロッドレ
ンズの間に位置し液晶を有する液晶フィルムと、前記一
対のロッドレンズにそれぞれ接続される入力光用、出力
光用の一対の光ファイバケーブルと、入力用の前記光フ
ァイバケーブルから入力される光を精密に離散的に遮閉
して出力光量を制御するために前記液晶フィルムを制御
するための液晶フィルム制御回路とを含む光量を制御す
るために前記液晶フィルムを制御するための液晶フィル
ム制御回路とを含むことを特徴とする光減衰器。A pair of rod lenses for input light and output light having a wavelength of (n+1/4)λ<n is an integer>, a liquid crystal film located between the pair of rod lenses and having a liquid crystal, and the pair of rod lenses. A pair of optical fiber cables for input light and output light are respectively connected to the input optical fiber cables, and a pair of optical fiber cables for precisely and discretely blocking the light input from the input optical fiber cables to control the amount of output light. A light attenuator comprising: a liquid crystal film control circuit for controlling a liquid crystal film; and a liquid crystal film control circuit for controlling the liquid crystal film to control the amount of light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12858185A JPS61285427A (en) | 1985-06-13 | 1985-06-13 | Optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12858185A JPS61285427A (en) | 1985-06-13 | 1985-06-13 | Optical attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61285427A true JPS61285427A (en) | 1986-12-16 |
Family
ID=14988289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12858185A Pending JPS61285427A (en) | 1985-06-13 | 1985-06-13 | Optical attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61285427A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6826318B2 (en) | 2001-10-12 | 2004-11-30 | Fujitsu Limited | Variable polarization plane rotator and optical device using same |
-
1985
- 1985-06-13 JP JP12858185A patent/JPS61285427A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6826318B2 (en) | 2001-10-12 | 2004-11-30 | Fujitsu Limited | Variable polarization plane rotator and optical device using same |
| US6931165B2 (en) | 2001-10-12 | 2005-08-16 | Fujitsu Limited | Variable polarization plane rotator and optical device using same |
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