JP3214128B2 - Optical signal processing method - Google Patents
Optical signal processing methodInfo
- Publication number
- JP3214128B2 JP3214128B2 JP03327793A JP3327793A JP3214128B2 JP 3214128 B2 JP3214128 B2 JP 3214128B2 JP 03327793 A JP03327793 A JP 03327793A JP 3327793 A JP3327793 A JP 3327793A JP 3214128 B2 JP3214128 B2 JP 3214128B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- light
- substance
- reference light
- nonlinear 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.)
- Expired - Fee Related
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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非
線形光学材料を利用した光信号処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical signal processing method using a nonlinear optical material used in fields such as optoelectronics, optical information processing, and optical communication.
【０００２】[0002]
【従来の技術およびその問題点】非線形光学材料は、レ
ーザー光の強電界下、二次以上の非線形応答を示す材料
であって、周波数変換、発振、スイッチング等の光信号
処理において重要な素材である。特に、三次非線形光学
材料は、光が有する高速性、並列性という優れた特性を
十分に発揮させた次世代の光通信、情報処理における基
幹素材として注目されている。この三次非線形光学材料
を用いた非線形光学素子は、光の照射に対して屈折率が
変化することを利用しようとするものである。この屈折
率変化を読み取る方法として、例えば、Fabry-Perrot共
振器を用いて微小な屈折率変化を増幅する方法が提案さ
れているが、この方法では光源の僅かな不安定性が敏感
に共振安定性に影響するので、システム全体が極めてデ
リケートなものとなり、これを安定に作動させるための
高度な寸法品質精度がコスト、量産面での障害となって
いる。また、屈折率変化を増大させるために極めて高い
エネルギーを注入せざるを得ず、材料の耐熱性、サーマ
ル効果、高い注入エネルギーに情報を載せるための技術
的障壁などの問題があった。2. Description of the Related Art A nonlinear optical material is a material that exhibits a second-order or higher nonlinear response under a strong electric field of laser light, and is an important material in optical signal processing such as frequency conversion, oscillation, and switching. is there. In particular, tertiary nonlinear optical materials are attracting attention as key materials in next-generation optical communication and information processing that fully exhibit the excellent characteristics of light, such as high speed and parallelism. The non-linear optical element using the third-order non-linear optical material attempts to utilize the fact that the refractive index changes with light irradiation. As a method of reading the refractive index change, for example, a method of amplifying a small refractive index change using a Fabry-Perrot resonator has been proposed, but in this method, slight instability of the light source is sensitive to resonance stability. As a result, the entire system is extremely delicate, and the high dimensional quality accuracy required for stable operation thereof is an obstacle in terms of cost and mass production. In addition, extremely high energy must be injected in order to increase the change in the refractive index, and there are problems such as heat resistance of the material, a thermal effect, and a technical barrier for putting information at high injection energy.
【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、旋光性物質の旋光性又は旋光分散を利
用することにより、三次非線形光学効果による屈折率変
化を感度良く取り出すことができる非線形光学材料を利
用した光信号処理方法を提供することである。本発明
は、旋光性物質及び三次非線形性を有する物質を含有し
てなる非線形光学材料に対し、参照光と信号光を同一偏
光面で入射させ、旋光性物質の旋光性又は旋光分散によ
り、参照光の偏光面を信号光の偏光面から傾けることに
より、三次非線形光学効果による屈折率変化を、参照光
の偏光変化として取り出すことを特徴とする光信号処理
方法に関する。本発明の非線形光学材料の形態として
は、旋光性物質及び三次非線形性を有する物質をポリマ
ー中にドープしたものや、旋光性を有する物質を三次非
線形性を有するポリマー中にドープしたもの、逆に、三
次非線形性を有する物質を旋光性を有するポリマー中に
ドープしたものが挙げられる。あるいは、旋光性物質と
三次非線形性を有する物質の会合体でもよい。また、本
発明の非線形光学材料の他の形態としては、１つの物質
が旋光性と三次非線形性を独立に併せ持つものが挙げら
れ、例えば、ポリマーの側鎖に旋光性物質及び三次非線
形性を有する物質を導入したものや、旋光性を有するポ
リマーの側鎖に三次非線形性を有する物質を導入したも
の、逆に、三次非線形性を有するポリマーの側鎖に旋光
性物質を導入したものが挙げられる。もちろん、三次非
線形性を有する物質自体が旋光性をもつものでもよい。
さらに、本発明の非線形光学材料の他の形態としては、
旋光性物質を含有する層と三次非線形性を有する物質を
含有する層を交互に複数層積層したものでもよい。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to take out the change in the refractive index due to the third-order nonlinear optical effect with high sensitivity by utilizing the optical rotation or optical rotation of an optically rotating substance. It is an object of the present invention to provide an optical signal processing method using a nonlinear optical material. The present invention relates to a non-linear optical material containing an optical rotatory substance and a substance having third-order nonlinearity, in which the reference light and the signal light are incident on the same polarization plane, and the optical rotatory substance has an optical rotatory power or an optical rotatory dispersion. The present invention relates to an optical signal processing method characterized by extracting a change in refractive index due to a third-order nonlinear optical effect as a change in polarization of reference light by inclining a polarization plane of light from a polarization plane of signal light. Examples of the form of the nonlinear optical material of the present invention include a material obtained by doping an optically rotating substance and a substance having a third-order nonlinearity in a polymer, a substance obtained by doping a substance having an optical rotation property into a polymer having a third-order nonlinearity, and conversely. And a substance having a third-order nonlinearity doped in a polymer having optical rotation. Alternatively, it may be an association of an optical rotation substance and a substance having third-order nonlinearity. Further, as another form of the nonlinear optical material of the present invention, there is a material in which one substance independently has optical rotation and third-order nonlinearity, for example, a substance having an optical rotation substance and a third-order nonlinearity in a side chain of a polymer. A substance in which a substance having a third-order nonlinearity is introduced into a side chain of a polymer having an optical rotation property, or a substance in which a light-rotating substance is introduced into a side chain of a polymer having a third-order nonlinearity can be cited. . Of course, the substance having the third-order nonlinearity itself may have optical rotation.
Further, as another embodiment of the nonlinear optical material of the present invention,
A layer in which a plurality of layers each containing an optical rotatory substance and a layer containing a substance having a third-order nonlinearity may be alternately stacked.
【０００４】旋光性物質としては、物質自体が旋光性を
有するキラル化合物や、結晶化により旋光性を示す物
質、あるいは、外部の電場、磁場、あるいは基板のラビ
ング等により旋光性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、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。また、三次非線形性を有する物質としては、大きな
非局在化π電子系を有するものが挙げられ、例えば、Ｄ
ＡＮＳＥ（４−ジメチルアミノ−４’−ニトロスチルベ
ン）、テトラキス（２，４−キシリル）ブタトリエン、
９，１０−ビス（３，３−ジフェニル−３−ヒドロキシ
プロピニル）アントラセン、２−（４−ニトロフェニ
ル）−４，５−ジフェニルイミダゾール、２−（４−ニ
トロフェニル）−４，５−ビス（４−メトキシフェニ
ル）イミダゾール、テトラチオテトラセン、３，６−ビ
ス（４，５−ジフェニル−２Ｈ−イミダゾール−２−イ
リデン）−１，４−シクロヘキサジエン、２−（チオピ
ラン−４−イリデン）−１，３−ジチオール、１，１，
６，６−テトラフェニル−ヘキサ−１，５−ジエン−３
イン、３，３’−ジエチルオキサカルボシアニン、３，
３’−ジエチルオキサジカルボシアニンが挙げられ、ま
た励起子の効果によるＣｕＣｌ、ＣｄＳｅ、ＺｎＳｅ等
が挙げられる。Examples of the optically rotating substance include a chiral compound having an optical rotation itself, a substance which exhibits optical rotation by crystallization, and a substance which exhibits optical rotation due to an external electric field, a magnetic field, or rubbing of a substrate. No. Examples include amino acids, polypeptides, tartaric acid, helicene, quartz, cholesteric liquid crystals, nematic liquid crystals, and the like. As a substance having a third-order nonlinearity, a substance having a large delocalized π-electron system can be given.
ANSE (4-dimethylamino-4′-nitrostilbene), tetrakis (2,4-xylyl) butatriene,
9,10-bis (3,3-diphenyl-3-hydroxypropynyl) anthracene, 2- (4-nitrophenyl) -4,5-diphenylimidazole, 2- (4-nitrophenyl) -4,5-bis ( 4-methoxyphenyl) imidazole, tetrathiotetracene, 3,6-bis (4,5-diphenyl-2H-imidazole-2-ylidene) -1,4-cyclohexadiene, 2- (thiopyran-4-ylidene) -1 , 3-dithiol, 1,1,
6,6-tetraphenyl-hexa-1,5-diene-3
In, 3,3′-diethyloxacarbocyanine, 3,
3'-diethyloxadicarbocyanine, and CuCl, CdSe, ZnSe, and the like due to the effect of excitons.
【０００５】本発明においては、旋光性物質の旋光性又
は旋光分散を利用して、材料内部で偏光面を傾ける。こ
れにより、信号光と参照光を同一偏光面で入射しても、
三次非線形光学効果によって誘起された複屈折性を参照
光の楕円偏光化の形で取り出すことができる。In the present invention, the polarization plane is inclined inside the material by utilizing the optical rotation or optical rotation of the optical rotation substance. Thereby, even if the signal light and the reference light are incident on the same polarization plane,
The birefringence induced by the third-order nonlinear optical effect can be extracted in the form of elliptically polarized reference light.
【０００６】[0006]
【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、旋光性物質の旋光性を利用した光スイッチング
装置である。１１は本発明の非線形光学材料である。非
線形光学材料は、ポリ−Ｌ−グルタミン酸とＤＡＮＳＥ
をジクロロエタンに溶解し、キャスト後、溶媒を除去し
て得られたフィルムである。参照光１２を偏光子１４に
より垂直方向の直線偏光として非線形光学材料１１を透
過させると、旋光性により偏光面が回転する。検光子１
５は、信号光１３が入射されていない時、参照光を遮断
する方位に設定してある。The present invention will be specifically described below with reference to examples. Embodiment 1 FIG. 1 shows an optical switching device utilizing the optical rotation of an optically rotating substance. 11 is a nonlinear optical material of the present invention. Non-linear optical materials include poly-L-glutamic acid and DANSE
Is dissolved in dichloroethane, cast, and then the solvent is removed. When the reference light 12 is transmitted through the nonlinear optical material 11 as linearly polarized light in the vertical direction by the polarizer 14, the plane of polarization rotates due to optical rotation. Analyzer 1
Reference numeral 5 is set to a direction in which the reference light is blocked when the signal light 13 is not incident.
【０００７】一方、信号光１３を偏光子１６により垂直
方向の直線偏光として、参照光１２とは反対の方向から
非線形光学材料１１に入射させると、信号光は強い光で
あるため非線形光学材料１１に非線形光学効果を引き起
こす。一方、同一偏光面を持って反対方向から入射した
信号光と参照光は、旋光性によって偏光面が回転する。
即ち、非線形光学材料内部では参照光の偏光面は信号光
の偏光面から傾いた状態で、非線形光学効果が誘起され
るので、その結果、参照光は楕円偏光となる。そのた
め、参照光に垂直成分が生じ、これが検光子１５を透過
する。以上のように、本発明によれば、参照光と信号光
が同一の偏光面であっても、参照光と信号光を逆の方向
から非線形光学材料に入射させることにより、旋光性物
質の旋光性と三次の非線形性を利用して光スイッチング
装置を実現できる。On the other hand, when the signal light 13 is made to enter the nonlinear optical material 11 by the polarizer 16 as linearly polarized light in the vertical direction from the direction opposite to the reference light 12, the signal light is strong light, so that the nonlinear optical material 11 Causes a nonlinear optical effect. On the other hand, the signal light and the reference light having the same polarization plane and incident from opposite directions rotate the polarization plane due to the optical rotation.
That is, inside the nonlinear optical material, the nonlinear optical effect is induced in a state where the polarization plane of the reference light is inclined from the polarization plane of the signal light. As a result, the reference light becomes elliptically polarized light. Therefore, a vertical component is generated in the reference light, and this passes through the analyzer 15. As described above, according to the present invention, even when the reference light and the signal light have the same polarization plane, the reference light and the signal light are incident on the nonlinear optical material from the opposite directions, so that the optical rotation An optical switching device can be realized using the characteristics and the third-order nonlinearity.
【０００８】実施例２ 図２は、旋光性物質の旋光分散を利用した光スイッチン
グ装置である。２１は本発明の非線形光学材料である。
非線形光学材料は、ポリ−Ｌ−グルタミン酸とＤＡＮＳ
Ｅをジクロロエタンに溶解し、キャスト後、溶媒を除去
して得られたフィルムである。非線形光学材料２１は、
波長λ1 の参照光２２を偏光子２４により垂直方向の直
線偏光として透過させると、偏光面が９０°回転するよ
うに光路長を設定している。したがって、信号光が入射
されていない時、偏光面が９０°回転して水平方向とな
った参照光は、方位が垂直方向の検光子２５により遮断
される。Embodiment 2 FIG. 2 shows an optical switching device utilizing optical rotation dispersion of an optically rotating substance. 21 is a nonlinear optical material of the present invention.
Non-linear optical materials include poly-L-glutamic acid and DANS
A film obtained by dissolving E in dichloroethane, casting, and then removing the solvent. The nonlinear optical material 21 is
The optical path length is set such that when the reference light 22 having the wavelength λ 1 is transmitted by the polarizer 24 as linearly polarized light in the vertical direction, the polarization plane is rotated by 90 °. Therefore, when the signal light is not incident, the reference light whose polarization plane has been rotated by 90 ° and is in the horizontal direction is blocked by the analyzer 25 whose azimuth is in the vertical direction.
【０００９】一方、波長λ2 の信号光２３を偏光子２６
により垂直方向の直線偏光として、非線形光学材料２１
に入射させると、信号光は強い光であるため非線形光学
材料２１に非線形光学効果を引き起こす。この時、信号
光と参照光は波長が異なるため、旋光分散により偏光面
の回転角度が異なっている。即ち、参照光の偏光面が信
号光の偏光面に対して傾いた状態で、非線形光学効果が
誘起されるので、その結果、参照光は楕円偏光となる。
そのため、参照光に垂直成分が生じ、これが検光子２５
を透過する。以上のように、本発明によれば、参照光と
信号光が同一の偏光面であっても、参照光と信号光の波
長を変えて非線形光学材料に入射させることにより、旋
光性物質の旋光分散と三次の非線形性を利用して光スイ
ッチング装置を実現できる。On the other hand, the signal light 23 having the wavelength λ 2 is
As linearly polarized light in the vertical direction, the nonlinear optical material 21
, The signal light is strong light, so that the nonlinear optical material 21 causes a nonlinear optical effect. At this time, since the signal light and the reference light have different wavelengths, the rotation angles of the polarization planes are different due to optical rotation dispersion. That is, the nonlinear optical effect is induced in a state where the polarization plane of the reference light is inclined with respect to the polarization plane of the signal light. As a result, the reference light becomes elliptically polarized light.
Therefore, a vertical component is generated in the reference light, which is
Through. As described above, according to the present invention, even if the reference light and the signal light have the same polarization plane, by changing the wavelengths of the reference light and the signal light to enter the nonlinear optical material, the optical rotation An optical switching device can be realized using dispersion and third-order nonlinearity.
【図１】図１は、本発明の一実施例の光スイッチング装
置の概略図である。FIG. 1 is a schematic diagram of an optical switching device according to one embodiment of the present invention.
【図２】図２は、本発明の他の実施例の光スイッチング
装置の概略図である。FIG. 2 is a schematic diagram of an optical switching device according to another embodiment of the present invention.
１１ 非線形光学材料 １２ 参照光 １３ 信号光 １４ 偏光子 １５ 検光子 １６ 偏光子 ２１ 非線形光学材料 ２２ 参照光 ２３ 信号光 ２４ 偏光子 ２５ 検光子 ２６ 偏光子 DESCRIPTION OF SYMBOLS 11 Nonlinear optical material 12 Reference light 13 Signal light 14 Polarizer 15 Analyzer 16 Polarizer 21 Nonlinear optical material 22 Reference light 23 Signal light 24 Polarizer 25 Analyzer 26 Polarizer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 1991年（平成３年）秋季第52回応用物 理学会学術講演会予稿集第３分冊 ｐ ｐ．1126（講演番号11ｐ−Ｔ−７）横沢 伊裕 他 (58)調査した分野(Int.Cl.7，ＤＢ名) G02F 1/35 - 1/365 ＪＩＣＳＴファイル（ＪＯＩＳ) ＷＰＩ（ＤＩＡＬＯＧ)──────────────────────────────────────────────────続 き Continuation of the front page (56) References 1991 (Heisei Era) 52nd Autumn Meeting of the Japan Society of Applied Physics Academic Lectures, 3rd Volume, p. P. 1126 (lecture number 11p-T-7) Yokozawa Ihiro et al. (58) Field surveyed (Int. Cl. 7 , DB name) G02F 1/35-1/365 JICST file (JOIS) WPI (DIALOG)
Claims (1)
質を含有してなる非線形光学材料に対し、参照光と信号
光を同一偏光面で入射させ、旋光性物質の旋光性又は旋
光分散により、参照光の偏光面を信号光の偏光面から傾
けることにより、三次非線形光学効果による屈折率変化
を、参照光の偏光変化として取り出すことを特徴とする
光信号処理方法。A nonlinear optical material containing an optical rotatory material and a material having a third-order nonlinearity is provided with a reference light and a signal.
Light is incident on the same plane of polarization, and the optical rotation or rotation of the optical rotation
Due to the light dispersion, the polarization plane of the reference light is tilted from the polarization plane of the signal light.
Refractive index change due to the third-order nonlinear optical effect
Is extracted as a change in the polarization of the reference light.
Optical signal processing method .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03327793A JP3214128B2 (en) | 1992-03-03 | 1993-02-23 | Optical signal processing method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4-80292 | 1992-03-03 | ||
| JP8029292 | 1992-03-03 | ||
| JP03327793A JP3214128B2 (en) | 1992-03-03 | 1993-02-23 | Optical signal processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05307201A JPH05307201A (en) | 1993-11-19 |
| JP3214128B2 true JP3214128B2 (en) | 2001-10-02 |
Family
ID=26371953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03327793A Expired - Fee Related JP3214128B2 (en) | 1992-03-03 | 1993-02-23 | Optical signal processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3214128B2 (en) |
-
1993
- 1993-02-23 JP JP03327793A patent/JP3214128B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| １９９１年（平成３年）秋季第５２回応用物理学会学術講演会予稿集第３分冊 ｐｐ．１１２６（講演番号１１ｐ−Ｔ−７）横沢伊裕 他 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05307201A (en) | 1993-11-19 |
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