JPS60216328A - Optical modulator - Google Patents
Optical modulatorInfo
- Publication number
- JPS60216328A JPS60216328A JP7332684A JP7332684A JPS60216328A JP S60216328 A JPS60216328 A JP S60216328A JP 7332684 A JP7332684 A JP 7332684A JP 7332684 A JP7332684 A JP 7332684A JP S60216328 A JPS60216328 A JP S60216328A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- modulated
- acousto
- optical modulator
- 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
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、音響光学効果によりレーザ光などの光を変調
する光変調器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical modulator that modulates light such as a laser beam using an acousto-optic effect.
従来例の構成とその問題点
音響光学素子は、音響光学媒体に圧電素子を装着した基
本構成であり、圧電素子に電気信号を人力すると、超音
波信号となって音響光学媒体中を伝播し、ここを通る一
定角度で入射した光を回折するものである。そして、回
折のだめに搬送波周波数が必要であり、この周波数を変
えると光の方向が変わり、振幅を変えると光の強度が変
わるので各種の変調ができる。Conventional configuration and its problems Acousto-optic elements have a basic configuration in which a piezoelectric element is attached to an acousto-optic medium.When an electric signal is applied to the piezoelectric element, it becomes an ultrasonic signal and propagates through the acousto-optic medium. It diffracts light that passes through it and enters at a certain angle. A carrier wave frequency is required for diffraction, and changing this frequency changes the direction of the light, and changing the amplitude changes the intensity of the light, making it possible to perform various modulations.
その中で最もよく用いられるものが光の・ぐルス変調で
ある。すなわち、入力信号をパルス状にオフ・オフする
ことにより光をオン・オフし、この光を用いて光記録や
計測に用いられるわけである。The most commonly used of these is optical modulation. That is, the light is turned on and off by turning the input signal off and on in a pulsed manner, and this light is used for optical recording and measurement.
最近の高速信号処理化の流れの中で、音響光学素子を用
いた光パルス変調も高速化されているが、音響光学素子
の応答性は下記の（１）式に示すように、光の径ｄと音
響光学媒体中の音速Ｖによって・＜ルスの立上り速度ｔ
ｒが決定される。With the recent trend toward high-speed signal processing, optical pulse modulation using an acousto-optic device has also become faster, but the response of the acousto-optic device depends on the diameter of the light, as shown in equation (1) below. d and the speed of sound in the acousto-optic medium V,
r is determined.
ｔｒ：；０．６６ｄ／ｖ ・−（１）
従って、光学系が決まればほぼ光変調器としての速度が
決まるわけである。tr:;0.66d/v ·-(1) Therefore, once the optical system is determined, the speed of the optical modulator is approximately determined.
従来の光パルス変調器の構成を第１図に示す。FIG. 1 shows the configuration of a conventional optical pulse modulator.
第１図において、１は音響光学素子であり、音響光学媒
体１ａ、圧電素子１ｂより構成されている。In FIG. 1, reference numeral 1 denotes an acousto-optic element, which is composed of an acousto-optic medium 1a and a piezoelectric element 1b.
そして、高周波発振器２でつくられた搬送波はミキサー
３で変調入力信号Ｍによって変調され、高周波パルスと
なり、増幅器４を経て音響光学素子３ ・−゛
１に印加される。今、音響光学素子１に一定角度で入射
する入射光重は変調され、回折光重１．非回折光工。と
なって出射する。そして、回折光１１を用いる場合は、
変調入力信号Ｍのオフ・オフに応じて回折光１１ もオ
ン・オフされることになる。Then, the carrier wave generated by the high frequency oscillator 2 is modulated by the modulation input signal M in the mixer 3, becomes a high frequency pulse, and is applied to the acousto-optic element 3.--1 via the amplifier 4. Now, the incident light weight that enters the acousto-optic element 1 at a certain angle is modulated, and the diffracted light weight 1. Non-diffractive optical technology. It emits as follows. When using the diffracted light 11,
The diffracted light 11 is also turned on and off in response to the off and on of the modulated input signal M.
この光変調器により高速の光パルス変調を行うと、上記
（１）式に示しだ応答性から、第３図ａの変調入力信号
Ｍに対し１回折光１１ は同図すに示した応答となる。When high-speed optical pulse modulation is performed using this optical modulator, from the response shown in equation (1) above, the response of the single diffracted light 11 to the modulated input signal M shown in FIG. 3a is as shown in the figure. Become.
この時、光パルスの光量は、変調入力信号Ｍの時間ｔに
おける幅τ１に対し、例えばτ −２τ やτ −３τ
１ とした時には、整数３ １ ３
倍とはならず、従ってこの光エネルギーを使って感光体
に記録しようとするなどの場合、光出力のピーク値を変
えないと同じ線幅となるような断続線が得られないなど
の欠点があり、高速化の支障となっていた。At this time, the light intensity of the optical pulse is, for example, τ −2τ or τ −3τ with respect to the width τ1 of the modulated input signal M at time t.
1, it will not be multiplied by an integer of 3 1 3. Therefore, when trying to record on a photoreceptor using this optical energy, the line width will be the same unless the peak value of the optical output is changed. There were drawbacks such as the inability to obtain a line, which was an impediment to increasing speed.
発明の目的
本発明はこのような従来の欠点を除去し、音響光学素子
の最高の応答性まで安定に高速化できる光変調器を提供
することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide an optical modulator that can eliminate such conventional drawbacks and stably increase the speed to the highest responsiveness of an acousto-optic element.
発明の構成
本発明は上記目的を達成するために、変調入力信号及び
搬送波信号とは別の最小パルス変調単位を与える発振器
を備え、これをミキサーを用いて変調入力により変調し
、パルス列とした上で搬送波信号を変調する構成としだ
ものである。Structure of the Invention In order to achieve the above object, the present invention includes an oscillator that provides a minimum pulse modulation unit separate from a modulation input signal and a carrier wave signal, modulates this with a modulation input using a mixer, and generates a pulse train. The configuration is such that the carrier wave signal is modulated by the carrier wave signal.
実施例の説明
以下、本発明の一実施例を第２図により説明する。なお
、図中の記号は第１図と同一部分は同一記号を用いてい
る。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that the same symbols in the figure are used for the same parts as in FIG. 1.
第２図において、発振器６の周波数はミキサー６により
変調入力信号Ｍで変調され、この信号が従来例の変調入
力信号Ｍの変わりに変調入力信号として用いられること
になる。その動作は第３図Ｃに示すように光出力１１１
が光パルス列で構成され、最小単位の整数倍の光出力
とすることができる。In FIG. 2, the frequency of the oscillator 6 is modulated by a modulation input signal M by the mixer 6, and this signal is used as the modulation input signal instead of the modulation input signal M of the conventional example. Its operation is as shown in FIG.
is composed of a light pulse train, and the light output can be an integral multiple of the minimum unit.
発明の効果
本発明による光変調器は、上記実施例で説明したように
きわめて簡単な構成により高速の光パル５ ＋
ス変調がきわめて安定に実現でき、光出力の制御も不要
であり、きわめて実用的な光変調器を提供することがで
きる。Effects of the Invention The optical modulator according to the present invention has an extremely simple configuration as described in the above embodiments, and can realize extremely stable optical pulse modulation at high speed, and does not require control of optical output, making it extremely practical. It is possible to provide a unique optical modulator.
第１図は従来の光変調器の基本構成を示す図、第２図は
本発明による光変調器の一実施例を示す基本構成図、第
３図は従来と本発明の光変調器における動作を説明する
図である。
１・・・・・・音響光学素子、１ａ・・・・音響光学媒
体、１ｂ・・・・圧電素子、２・・−・・高趙波発振器
、３・・・・・第１のミキサー、４・・・−・・増幅器
、６・・・・・・発振器、６・・・・第２のミキサー、
工・・・・・・入射光、工１，１１１・・・・・回折光
、■ ・・・・非回折光、Ｍ・・・−・・変調人力信号
。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図FIG. 1 is a diagram showing the basic configuration of a conventional optical modulator, FIG. 2 is a basic configuration diagram showing an embodiment of the optical modulator according to the present invention, and FIG. 3 is a diagram showing the operation of the conventional optical modulator and the optical modulator of the present invention. FIG. 1... Acousto-optic element, 1a... Acousto-optic medium, 1b... Piezoelectric element, 2... High wave oscillator, 3... First mixer, 4...-... Amplifier, 6... Oscillator, 6... Second mixer,
G...Incoming light, G1,111...Diffracted light, ■...Non-diffracted light, M...Modulated human input signal. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure
Claims (1)
より変調し、得られた信号で第２のミキサーにより第２
の搬送波周波数を変調した信号を音響光学素子に入力す
ることを特徴とする光変調器。A first frequency is modulated by a modulating input signal using a first mixer, and a second frequency is modulated by a second mixer with the resulting signal.
An optical modulator, characterized in that a signal modulated with a carrier wave frequency is input to an acousto-optic element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7332684A JPS60216328A (en) | 1984-04-12 | 1984-04-12 | Optical modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7332684A JPS60216328A (en) | 1984-04-12 | 1984-04-12 | Optical modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60216328A true JPS60216328A (en) | 1985-10-29 |
Family
ID=13514930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7332684A Pending JPS60216328A (en) | 1984-04-12 | 1984-04-12 | Optical modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60216328A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019536077A (en) * | 2016-10-18 | 2019-12-12 | トルンプフ シュヴァイツ アクチエンゲゼルシャフトＴＲＵＭＰＦ Ｓｃｈｗｅｉｚ ＡＧ | High frequency driver circuit for acousto-optic components and method for operating a high frequency driver circuit |
-
1984
- 1984-04-12 JP JP7332684A patent/JPS60216328A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019536077A (en) * | 2016-10-18 | 2019-12-12 | トルンプフ シュヴァイツ アクチエンゲゼルシャフトＴＲＵＭＰＦ Ｓｃｈｗｅｉｚ ＡＧ | High frequency driver circuit for acousto-optic components and method for operating a high frequency driver circuit |
| US11550174B2 (en) | 2016-10-18 | 2023-01-10 | Trumpf Schweiz Ag | Operating a high-frequency driver circuit |
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