JPH07113987A - Optical angle modulation-to-intensity modulation conversion device - Google Patents
Optical angle modulation-to-intensity modulation conversion deviceInfo
- Publication number
- JPH07113987A JPH07113987A JP25866893A JP25866893A JPH07113987A JP H07113987 A JPH07113987 A JP H07113987A JP 25866893 A JP25866893 A JP 25866893A JP 25866893 A JP25866893 A JP 25866893A JP H07113987 A JPH07113987 A JP H07113987A
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- JP
- Japan
- Prior art keywords
- modulation
- angle
- light
- intensity
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、オプトエレクトロニク
ス、光情報処理、光通信等の分野において用いられる光
角度変調−強度変調変換装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical angle modulation / intensity modulation conversion device used in the fields of optoelectronics, optical information processing, optical communication and the like.
【０００２】[0002]
【従来の技術およびその問題点】光情報処理は、光が有
する高速性、並列性という優れた特性を十分に発揮させ
る次世代の通信、情報処理の基幹になるものとして注目
されている。光通信、光情報処理は一部で実用化され、
盛んに利用されているが、これらのものは光の強度上に
変調信号を乗せるといった方式が取られており、光の高
速性を十分に発揮できないという問題点があった。そこ
で、大容量、超高速に通信及び信号処理を行う為には光
の振動自身、即ち光の周波数や位相を直接変調する角度
変調方式が必要とされる。2. Description of the Related Art Optical information processing has been attracting attention as a core of next-generation communication and information processing that can fully exhibit the excellent characteristics of light such as high speed and parallelism. Optical communication and optical information processing have been partially put into practical use,
Although these are widely used, there is a problem in that these systems employ a method in which a modulation signal is placed on the intensity of light and cannot sufficiently exhibit the high speed of light. Therefore, in order to carry out communication and signal processing with a large capacity and at an ultra-high speed, an angle modulation method for directly modulating the vibration itself of light, that is, the frequency and phase of light is required.
【０００３】[0003]
【問題点を解決するための手段】本発明の目的は、前記
問題点を解決し、旋光性物質の旋光分散特性を利用する
ことにより、簡単な構造で角度変調された光信号を強度
変調された光信号に変換することができる新規な変換装
置を提供することである。本発明は、角度変調された光
信号を強度変調された光信号に変換する装置であって、
旋光分散要素と偏光要素を具備してなることを特徴とす
る光角度変調−強度変調変換装置に関する。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and utilize the optical rotatory dispersion characteristic of an optical rotatory substance to intensity-modulate an angle-modulated optical signal with a simple structure. It is an object of the present invention to provide a novel conversion device capable of converting an optical signal to an optical signal. The present invention is a device for converting an angle-modulated optical signal into an intensity-modulated optical signal,
The present invention relates to an optical angle modulation-intensity modulation conversion device comprising an optical rotation dispersion element and a polarization element.
【０００４】本発明の旋光分散要素としては、旋光分散
性能を有する物質の結晶やポリマー、あるいは旋光分散
性能を有する物質をポリマーや溶液中にドープしたり、
ポリマーの側鎖に導入したものが挙げられる。あるい
は、旋光性を有するポリマーや低分子中に色素等の発色
物質を導入し発色物質に旋光分散性能を誘起したもので
もよい。また、複数の旋光分散性材料をブレンドしたも
のでもよい。As the optical rotatory dispersion element of the present invention, crystals or polymers of a substance having optical rotatory dispersion performance, or doping of a substance having optical rotatory dispersion performance into a polymer or a solution,
The thing introduced into the side chain of a polymer is mentioned. Alternatively, it may be a polymer having optical rotatory power or a substance in which a color-forming substance such as a dye is introduced into a low molecule to induce the optical-rotating dispersion performance in the color-forming substance. Further, it may be a blend of a plurality of optical rotation dispersive materials.
【０００５】旋光分散性能を有する物質としては、分子
自体が旋光分散性能を有するキラル化合物や、結晶化に
より旋光分散性能を示す物質、あるいは、外部の電場、
磁場、あるいは基板のラビング等により旋光分散性能を
示す物質などが挙げられる。例えば、アミノ酸、ポリペ
プチド、酒石酸、ヘリセン、ポリグルタメート、水晶、
コレステリック液晶、ネマチック液晶等が挙げられる。
偏光要素としては、例えば、複屈折を利用したもの、二
色性を利用したもの、反射を利用したもの等が挙げられ
る。As the substance having the optical rotatory dispersion performance, a chiral compound in which the molecule itself has the optical rotatory dispersion performance, a substance exhibiting the optical rotatory dispersion performance by crystallization, or an external electric field,
Examples thereof include a substance exhibiting optical rotation dispersion performance due to a magnetic field or rubbing of a substrate. For example, amino acids, polypeptides, tartaric acid, helicene, polyglutamates, crystals,
Cholesteric liquid crystals, nematic liquid crystals and the like can be mentioned.
Examples of the polarizing element include those utilizing birefringence, those utilizing dichroism, and those utilizing reflection.
【０００６】本発明においては、旋光性の波長分散、即
ち周波数分散を利用して角度変調−強度変調変換を行
う。入射信号光の周波数、即ち波長が変化すると旋光角
が変化するので、偏光要素を透過する光の量が変化す
る。したがって、角度変調された光信号を強度変調され
た光信号に変換することができる。In the present invention, the angle modulation-intensity modulation conversion is carried out by utilizing the optical chromatic dispersion, that is, the frequency dispersion. When the frequency of the incident signal light, that is, the wavelength changes, the optical rotation angle changes, so that the amount of light transmitted through the polarization element changes. Therefore, the angle-modulated optical signal can be converted into the intensity-modulated optical signal.
【０００７】[0007]
【実施例】以下に、実施例を示して本発明を具体的に説
明する。 実施例１ 図１は、本発明における周波数変調された光信号を強度
変調された電気信号に変換する装置の概略図である。１
１は入射信号光であり代表的な角度変調である周波数変
調されている。信号光は、偏光子１２によって直線偏光
となって旋光分散要素１３に入射する。１３により偏光
面が回転した信号光は、検光子１４を一部が透過して光
検出器１５によって電気信号に変換される。EXAMPLES The present invention will be specifically described below with reference to examples. Embodiment 1 FIG. 1 is a schematic diagram of an apparatus for converting a frequency-modulated optical signal into an intensity-modulated electric signal according to the present invention. 1
Reference numeral 1 is incident signal light, which is frequency-modulated, which is a typical angle modulation. The signal light becomes linearly polarized light by the polarizer 12 and enters the optical rotation dispersion element 13. A part of the signal light whose polarization plane is rotated by 13 is transmitted through the analyzer 14 and converted into an electric signal by the photodetector 15.
【０００８】ここで、検光子１４は変調を受けていない
角周波数ω0の信号光を消光する方位からバイアス角θ
回転して設定してある。この時、検光子１４を透過する
光の強度はｓｉｎθの２乗に比例する。ここで信号光が
周波数変調を受けて角周波数がΔωだけ変化した場合、
旋光分散要素１３を透過した光は旋光分散によって旋光
角が変化する。この時の旋光角の変化量をΔη0とする
と、検光子１４を透過する光の強度はｓｉｎ（θ−Δη
0）の２乗に比例した量になる。Here, the analyzer 14 has a bias angle θ from the azimuth at which the signal light of the angular frequency ω 0 that has not been modulated is extinguished.
It is set to rotate. At this time, the intensity of light transmitted through the analyzer 14 is proportional to the square of sin θ. Here, when the signal light undergoes frequency modulation and the angular frequency changes by Δω,
The angle of optical rotation of the light transmitted through the optical rotatory dispersion element 13 changes due to optical rotatory dispersion. If the amount of change in the optical rotation angle at this time is Δη 0 , the intensity of light transmitted through the analyzer 14 is sin (θ−Δη
It becomes an amount proportional to the square of 0 ).
【０００９】このように、信号光に乗った周波数変調信
号は、強度変調に変換され、光検出器によって電気信号
として取り出される。この時の信号強度の変化量は近似
的にΔη0ｓｉｎ２θに比例する。以上、周波数変調に
ついて説明したが、位相変調の場合は微分が出力信号の
強度変化に変換されて取り出される。As described above, the frequency-modulated signal carried on the signal light is converted into intensity-modulated signal and taken out as an electric signal by the photodetector. The amount of change in signal strength at this time is approximately proportional to Δη 0 sin2θ. Although the frequency modulation has been described above, in the case of phase modulation, the differential is converted into the intensity change of the output signal and is extracted.
【００１０】[0010]
【発明の効果】本発明によれば、簡単な構成により光の
角度変調を強度変調に変換することができる。According to the present invention, angle modulation of light can be converted into intensity modulation with a simple structure.
【図１】図１は、本発明における周波数変調された光信
号を強度変調された電気信号に変換する装置の概略図で
ある。FIG. 1 is a schematic diagram of an apparatus for converting a frequency-modulated optical signal into an intensity-modulated electrical signal according to the present invention.
１１ 入射信号光 １２ 偏光子 １３ 旋光分散要素 １４ 検光子 １５ 光検出器 11 Incident signal light 12 Polarizer 13 Optical dispersion element 14 Analyzer 15 Photodetector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 芦高 秀知 千葉県市原市五井南海岸８番の１ 宇部興 産株式会社千葉研究所内 (72)発明者 五神 真 東京都文京区本郷７−３−１ ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hidechika Ashitaka 1-8 Goi Minamikaigan, Ichihara-shi, Chiba Ube Industries Ltd. Chiba Research Institute (72) Inventor Makoto Gokami 7- Hongo, Bunkyo-ku, Tokyo 3-1
Claims (1)
光信号に変換する装置であって、旋光分散要素と偏光要
素を具備してなることを特徴とする光角度変調−強度変
調変換装置。1. A device for converting an angle-modulated optical signal into an intensity-modulated optical signal, comprising an optical rotation dispersion element and a polarization element, and an optical angle modulation-intensity modulation conversion apparatus. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25866893A JP3651917B2 (en) | 1993-10-15 | 1993-10-15 | Optical angle modulation-intensity modulation conversion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25866893A JP3651917B2 (en) | 1993-10-15 | 1993-10-15 | Optical angle modulation-intensity modulation conversion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07113987A true JPH07113987A (en) | 1995-05-02 |
| JP3651917B2 JP3651917B2 (en) | 2005-05-25 |
Family
ID=17323445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25866893A Expired - Fee Related JP3651917B2 (en) | 1993-10-15 | 1993-10-15 | Optical angle modulation-intensity modulation conversion method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3651917B2 (en) |
-
1993
- 1993-10-15 JP JP25866893A patent/JP3651917B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3651917B2 (en) | 2005-05-25 |
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