JPH05165071A - Method and device for varying acousto-optical filter penetrating width - Google Patents
Method and device for varying acousto-optical filter penetrating widthInfo
- Publication number
- JPH05165071A JPH05165071A JP3353352A JP35335291A JPH05165071A JP H05165071 A JPH05165071 A JP H05165071A JP 3353352 A JP3353352 A JP 3353352A JP 35335291 A JP35335291 A JP 35335291A JP H05165071 A JPH05165071 A JP H05165071A
- Authority
- JP
- Japan
- Prior art keywords
- acousto
- frequency
- optic filter
- transmission width
- filter
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は入力光信号から所定の波
長を持つ光を選択する音響光学フィルタの透過幅を可変
にする方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for varying the transmission width of an acousto-optic filter for selecting light having a predetermined wavelength from an input optical signal.
【０００２】[0002]
【従来の技術】従来、音響光学フィルタは波長多重信号
から１波長を選択する手段として、あるいは光増幅器出
力から自然放出光雑音を除去する手段として用いられて
いる。その際、到来信号光の変調時スペクトル拡がりが
波長チャネル毎に異なっても、あるいはデバイス特性変
動や変調方式変更により経時変化を示してもフィルタ透
過幅は設計時にデバイス長で規定されてしまい固定的で
あるためこれらの変化に対応することができなかった。
そのため音響光学フィルタの設計時にシステム内で使用
する波長チャネルのうちスペクトル拡がりが最大になる
ものに合せ、さらにその値を経時変化に伴う変動分を補
償しうるに十分な値にまで拡大したものを音響光学フィ
ルタ透過幅にとる必要があった。2. Description of the Related Art Conventionally, an acousto-optic filter has been used as a means for selecting one wavelength from a wavelength-multiplexed signal or a means for removing spontaneous emission noise from the output of an optical amplifier. At that time, even if the spectrum spread at the time of modulation of the incoming signal light is different for each wavelength channel, or even if it shows a change over time due to device characteristic fluctuations or modulation method changes, the filter transmission width is fixed by the device length at the time of design and fixed. Therefore, we could not respond to these changes.
Therefore, when designing an acousto-optic filter, match the wavelength channel used in the system with the one that maximizes the spectral spread, and further expand that value to a value that is sufficient to compensate for fluctuations due to aging. It was necessary to set the transmission width of the acousto-optic filter.
【０００３】従って、波長多重伝送時には不必要に広く
設定した上記の透過幅に合わせて波長チャネル間隔を設
定しなければならず、波長チャネルの高密度化の障害と
なっていた。また光増幅器出力からの自然放出光雑音除
去に用いる際には不必要に透過幅を広げた分、雑音が増
大するという問題があった。これらの課題を解決するた
め外部信号により音響光学フィルタの透過幅を変化させ
る方法として、アムノン・ヤリフらによる「Ｏｐｔｉｃ
ａｌ Ｗａｖｅｓ ｉｎ Ｃｒｙｓｔａｌｓ」第１０章
（１９８４年刊）記載の説明から容易に類推されるよう
にフィルタに入力する高周波信号のパワーを調整する方
法が知られていた。Therefore, at the time of wavelength division multiplexing transmission, the wavelength channel interval must be set in accordance with the above-mentioned transmission width which is set unnecessarily wide, which is an obstacle to increasing the density of wavelength channels. In addition, when used for removing spontaneous emission noise from the output of the optical amplifier, there is a problem that noise is increased by unnecessarily widening the transmission width. As a method of changing the transmission width of the acousto-optic filter by an external signal in order to solve these problems, "Optic by Amnon Yariff et al.
A method for adjusting the power of a high-frequency signal input to a filter has been known, as can be easily inferred from the description in “Al Waves in Crystals”, Chapter 10 (published in 1984).
【０００４】[0004]
【発明が解決しようとする課題】上述の方法では、音響
光学フィルタに印加する高周波信号のパワーを小さくす
ると、透過幅が広がるのと同時にサイドローブ抑圧比が
劣化してしまうため、波長選択用フィルタとして用いる
際にはクロストークが増大し、光増幅器出力雑音除去に
用いる際にはサイドローブに対応する雑音が除去しきれ
ないという問題があった。In the above method, when the power of the high frequency signal applied to the acousto-optic filter is reduced, the transmission width is widened and the side lobe suppression ratio is deteriorated. Therefore, the wavelength selection filter is used. However, there is a problem that crosstalk increases when it is used as, and noise corresponding to the side lobes cannot be completely removed when it is used for removal of optical amplifier output noise.
【０００５】本発明の目的は、このような従来技術の欠
点を除去し、サイドローブ抑圧比の劣化を伴わない音響
光学フィルタ透過幅の可変方法及び装置を提供すること
にある。An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide a method and apparatus for varying the transmission width of an acousto-optic filter without deterioration of the side lobe suppression ratio.
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めに提供する本発明の方法は、外部から印加される高周
波信号の周波数が変化すると透過中心波長が変わる音響
光学フィルタの透過幅可変方法であって、音響光学フィ
ルタに単一周波数の高周波信号を入力する場合に得られ
る透過幅に対応する値の近傍の周波数差を持つ２つ以上
に高周波信号を同時に音響光学フィルタに印加し、前記
周波数差を変化させることで、透過幅を変化させること
を特徴とする。The method of the present invention provided to achieve the above object is a method of varying the transmission width of an acousto-optical filter in which the transmission center wavelength changes when the frequency of a high frequency signal applied from the outside changes. The high-frequency signal is applied to the acousto-optic filter at the same time to two or more high-frequency signals having a frequency difference near a value corresponding to the transmission width obtained when a high-frequency signal of a single frequency is input to the acousto-optic filter, It is characterized in that the transmission width is changed by changing the frequency difference.
【０００７】また、上述の目的を達成するために提供す
る本発明の装置は、透過幅を変化させる対象である音響
光学フィルタを駆動する高周波で発振する高周波発振器
と、前記音響光学フィルタに単一周波数の高音波信号を
入力する場合に得られる透過幅に対応する値の近傍の周
波数差に等しい周波数で発振する周波数可変発振器と、
前記高周波発振器の出力と前記周波数可変発振器の出力
とを掛け合わせる掛算器とから成り、該掛算器の出力で
前記音響光学フィルタを駆動し該音響光学フィルタの透
過幅を変えることを特徴とする。Further, the device of the present invention provided to achieve the above-mentioned object includes a high-frequency oscillator which oscillates at a high frequency for driving an acousto-optic filter whose transmission width is changed, and a single high-frequency oscillator for the acousto-optic filter. A variable frequency oscillator that oscillates at a frequency equal to a frequency difference in the vicinity of a value corresponding to a transmission width obtained when a high frequency ultrasonic signal is input,
It is characterized by comprising a multiplier that multiplies the output of the high frequency oscillator and the output of the variable frequency oscillator, and drives the acousto-optic filter with the output of the multiplier to change the transmission width of the acousto-optic filter.
【０００８】[0008]
【作用】上述のように本発明では、音響光学フィルタに
印加する高周波信号を、音響光学フィルタ透過幅に対応
する周波数差程度にまで十分近接した２ないしそれ以上
の周波数から成る多周波信号とし、それぞれに対応する
透過特性を重ね合わせた形の透過特性を得、実質的に透
過幅を拡大することを可能にしている。このような構成
により多周波のうち、一周波数を調整することにより、
合成する音響光学フィルタ透過特性の透過中心波長間隔
を変えることができ、従って合成後の透過幅が調整でき
る。As described above, according to the present invention, the high frequency signal applied to the acousto-optic filter is a multi-frequency signal composed of two or more frequencies sufficiently close to each other to a frequency difference corresponding to the transmission width of the acousto-optic filter. It is possible to obtain a transmission characteristic in which the transmission characteristics corresponding to each of them are superposed, and to substantially enlarge the transmission width. By adjusting one of the multiple frequencies with this configuration,
It is possible to change the transmission center wavelength interval of the transmission characteristics of the acousto-optic filter to be combined, so that the transmission width after combination can be adjusted.
【０００９】本発明ではまた、上記の多周波信号を高周
波発振器の出力の高周波および周波数可変発振器の出力
の低周波信号の積で得ている。これにより高周波発振器
の数を減らすことができる。また、積をとることで２つ
の高周波信号に分配されることにより低減した高周波信
号パワーは、高周波発振器および周波数可変発振器のう
ちの少なくとも一方の出力信号電力を可変にすることに
より補償でき、ひいては透過特性のピーク透過率が減少
するのを防げる。In the present invention, the above-mentioned multi-frequency signal is also obtained by the product of the high-frequency signal output from the high-frequency oscillator and the low-frequency signal output from the variable frequency oscillator. This can reduce the number of high frequency oscillators. Further, the high frequency signal power reduced by being divided into two high frequency signals by taking the product can be compensated by making the output signal power of at least one of the high frequency oscillator and the variable frequency oscillator variable, and by extension, the transmission. It is possible to prevent the characteristic peak transmittance from decreasing.
【００１０】[0010]
【実施例】以下、本発明を実施例につき詳細に説明す
る。図１は本発明の第１の実施例を示す図である。EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 1 is a diagram showing a first embodiment of the present invention.
【００１１】透過幅を調整する対象である音響光学フィ
ルタ１には、１．５μｍ帯の３種類の光信号（波長λ
1 ，λ2 ，λ3 ）が波長多重して入力される。波長λ
1 ，λ2，λ3 の光信号は各々、１．２Ｇｂ／ｓのラン
ダムパターンを用いて半導体レーザを直接強度変調する
ことにより生成している。音響光学フィルタ１を駆動す
るための高周波信号発生源として、１７０〜１８０ＭＨ
ｚで発振周波数を調節できる第１及び第２の電圧制御発
振器（ＶＣＯ）２，３が用意されている。両発振器２，
３の出力は加算器４で加え合わされて、音響光学フィル
タ１に入力される。The acousto-optic filter 1 whose transmission width is to be adjusted has three types of 1.5 .mu.m band optical signals (wavelength .lambda.
1 , λ 2 , λ 3 ) are wavelength-multiplexed and input. Wavelength λ
The optical signals of 1 , λ 2 and λ 3 are generated by directly intensity-modulating the semiconductor laser using a random pattern of 1.2 Gb / s. As a high frequency signal generation source for driving the acousto-optic filter 1, 170 to 180 MH
First and second voltage controlled oscillators (VCO) 2 and 3 whose oscillation frequency can be adjusted by z are prepared. Both oscillators 2,
The outputs of 3 are added by the adder 4 and input to the acousto-optic filter 1.
【００１２】なお音響光学型波長フィルタの動作原理、
特性については、Ｓ．Ｅ．Ｈａｒｒｉｓらによるジャー
ナル・オブ・ジ・オプティカル・ソサイアティ・オブ・
アメリカ（Ｊｏｕｒｎａｌ ｏｆ ｔｈｅ Ｏｐｔｉｃ
ａｌ Ｓｏｃｉｅｔｙ ｏｆＡｍｅｒｉｃａ）第５９巻
第６号（１９６９年刊）７４４〜７４７頁所載の論文に
詳しい。The operating principle of the acousto-optic wavelength filter,
For characteristics, see S. E. Journal of the Optical Society of Harris et al.
America (Journal of the Optics
Al Society of America, Vol. 59, No. 6 (1969), pages 744-747.
【００１３】波長λ1 ，λ2 ，λ3 の光信号のうち波長
λ2 の光信号を音響光学フィルタ１で選択する場合に
は、ＶＣＯ２の周波数をｆ2 （１７０ＭＨｚ≦ｆ2 ≦１
８０ＭＨｚ）に設定し、ＶＣＯ３をｆ2 ＋△ｆに設定す
る。△ｆは１ＭＨｚ程度の値であり、波長λ2 の光信号
の光受信機５での受信状態が最適になるように微調され
る。 When the optical signal of wavelength λ 2 among the optical signals of wavelengths λ 1 , λ 2 and λ 3 is selected by the acousto-optic filter 1, the frequency of VCO 2 is f 2 (170 MHz ≦ f 2 ≦ 1).
80 MHz) and VCO3 is set to f 2 + Δf. Δf is a value of about 1 MHz, and is finely adjusted so that the reception state of the optical signal of wavelength λ 2 in the optical receiver 5 is optimum.
【００１４】図２は本発明の第２の実施例を示す図であ
る。音響光学フィルタ１に入力される波長多重光信号は
第１の実施例と同じである。本実施例では１７０〜１８
０ＭＨｚの高周波領域で発振する第１の電圧制御発振器
２０と１００ｋＨｚ〜２ＭＨｚの低周波領域で発振する
第２の電圧制御発振器３０とが用意されている。両発振
器２０，３０の発振周波数をｆM 、ｆm とすると、両者
を掛算器４０で掛け合わせることによりｆM ＋ｆm 、ｆ
M −ｆm なる２周波信号が得られる。なお、第１のＶＣ
Ｏ２０の出力は外部信号により調整可能である。FIG. 2 is a diagram showing a second embodiment of the present invention. The wavelength-multiplexed optical signal input to the acousto-optic filter 1 is the same as in the first embodiment. In this embodiment, 170 to 18
A first voltage controlled oscillator 20 that oscillates in a high frequency region of 0 MHz and a second voltage controlled oscillator 30 that oscillates in a low frequency region of 100 kHz to 2 MHz are prepared. Assuming that the oscillation frequencies of both oscillators 20 and 30 are f M and f m , by multiplying them by a multiplier 40, f M + f m and f m
M -f m become two-frequency signal is obtained. The first VC
The output of O20 can be adjusted by an external signal.
【００１５】ここで第１の実施例と同様にλ1 ，λ2 ，
λ3 の入力からλ2 を選択する場合には、まずｆM をｆ
2 に設定し、しかる後に光受信機５での受信状態が最良
となるようｆm を調整する。Here, as in the first embodiment, λ 1 , λ 2 ,
When selecting λ 2 from the input of λ 3 , first set f M to f
The value is set to 2 , and thereafter, f m is adjusted so that the reception state in the optical receiver 5 becomes the best.
【００１６】第２の実施例では、電圧制御発振器２０の
出力により選択される波長チャネルが定まり、電圧制御
発振器３０の出力により透過幅が調節され、両電圧制御
発振器２０，３０は夫々別の目的に使用されているか
ら、第１の実施例に比較して制御が若干容易になる。In the second embodiment, the wavelength channel selected by the output of the voltage controlled oscillator 20 is determined, the transmission width is adjusted by the output of the voltage controlled oscillator 30, and both voltage controlled oscillators 20 and 30 have different purposes. Therefore, the control is slightly easier than that of the first embodiment.
【００１７】以上の実施例で得られる透過特性は単一周
波信号で音響光学フィルタを駆動した場合の重ね合わせ
で与えられるから、単一周波信号パワーを減らして透過
特性を変化させる方法に比べると、サイドローブ抑圧比
の劣化を抑えたまま、透過幅を変えることが可能であ
る。Since the transmission characteristics obtained in the above embodiments are given by superposition when the acousto-optic filter is driven by a single frequency signal, compared with the method of reducing the single frequency signal power and changing the transmission characteristics. It is possible to change the transmission width while suppressing the deterioration of the side lobe suppression ratio.
【００１８】第１及び第２の実施例では、音響光学フィ
ルタに印加する高周波信号を２波としたが、さらに数を
増やして全体の透過特性の形状を調整することも可能で
ある。In the first and second embodiments, the high frequency signal applied to the acousto-optic filter is two waves, but it is also possible to further increase the number to adjust the shape of the entire transmission characteristic.
【００１９】[0019]
【発明の効果】以上に述べてきたように、本発明を用い
ることにより音響光学フィルタの透過幅をサイドローブ
抑圧比の劣化をもたらすことなく変化させることができ
る。As described above, by using the present invention, the transmission width of the acousto-optic filter can be changed without causing deterioration of the side lobe suppression ratio.
【図１】本発明の第１の実施例である音響光学フィルタ
透過幅可変装置の構成図である。FIG. 1 is a configuration diagram of an acousto-optic filter transmission width varying device that is a first embodiment of the present invention.
【図２】本発明の第２の実施例である音響光学フィルタ
透過幅可変装置の構成図である。FIG. 2 is a configuration diagram of an acousto-optic filter transmission width varying device that is a second embodiment of the present invention.
１ 音響光学フィルタ ２，３，２０，３０ ＶＣＯ ４ 加算器 ５ 光受信機 ４０ 掛算器 1 Acousto-optic filter 2, 3, 20, 30 VCO 4 Adder 5 Optical receiver 40 Multiplier
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年３月５日[Submission date] March 5, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項１[Name of item to be corrected] Claim 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００６[Correction target item name] 0006
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めに提供する本発明の方法は、外部から印加される高周
波信号の周波数が変化すると透過中心波長が変わる音響
光学フィルタの透過幅可変方法であって、音響光学フィ
ルタに単一周波数の高周波信号を入力する場合に得られ
る透過幅に対応する値の近傍の周波数差を持つ２つ以上
の高周波信号を同時に音響光学フィルタに印加し、前記
周波数差を変化させることで、透過幅を変化させること
を特徴とする。The method of the present invention provided to achieve the above object is a method of varying the transmission width of an acousto-optical filter in which the transmission center wavelength changes when the frequency of a high frequency signal applied from the outside changes. And two or more having a frequency difference near the value corresponding to the transmission width obtained when a high frequency signal of a single frequency is input to the acousto-optic filter.
The high-frequency signal is simultaneously applied to the acousto-optic filter, and the transmission width is changed by changing the frequency difference.
Claims (3)
が変化すると透過中心波長が変わる音響光学フィルタの
透過幅可変方法であって、音響光学フィルタに単一周波
数の高周波信号を入力する場合に得られる透過幅に対応
する値の近傍の周波数差を持つ２つ以上に高周波信号を
同時に音響光学フィルタに印加し、前記周波数差を変化
させることで、透過幅を変化させることを特徴とする音
響光学フィルタ透過幅可変方法。1. A method of varying the transmission width of an acousto-optic filter, wherein the transmission center wavelength changes when the frequency of a high-frequency signal applied from the outside changes, which is obtained when a single-frequency high-frequency signal is input to the acousto-optic filter. The high-frequency signal is applied to the acousto-optic filter at the same time to two or more having a frequency difference close to the value corresponding to the transmission width, and the transmission width is changed by changing the frequency difference. Filter transmission width variable method.
フィルタを駆動する高周波で発振する高周波発振器と、
前記音響光学フィルタに単一周波数の高周波信号を入力
する場合に得られる透過幅に対応する値の近傍の周波数
差に等しい周波数で発振する周波数可変発振器と、前記
高周波発振器の出力と前記周波数可変発振器の出力とを
掛け合わせる掛算器とから成り、該掛算器の出力で前記
音響光学フィルタを駆動し該音響光学フィルタの透過幅
を変えることを特徴とする音響光学フィルタ透過幅可変
装置。2. A high frequency oscillator that oscillates at a high frequency to drive an acousto-optic filter whose transmission width is changed,
A frequency variable oscillator that oscillates at a frequency equal to a frequency difference near a value corresponding to a transmission width obtained when a high frequency signal of a single frequency is input to the acousto-optic filter, an output of the high frequency oscillator, and the frequency variable oscillator. The acousto-optic filter transmission width varying device characterized in that the acousto-optic filter is driven by the output of the multiplier and the transmission width of the acousto-optic filter is changed.
の少なくとも一方の出力信号電力が可変であることを特
徴とする請求項２に記載の音響光学フィルタ透過幅可変
装置。3. The acousto-optic filter transmission width varying device according to claim 2, wherein the output signal power of at least one of the high frequency oscillator and the variable frequency oscillator is variable.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3353352A JP2976659B2 (en) | 1991-12-17 | 1991-12-17 | Method and apparatus for varying transmission width of acousto-optic filter |
| US07/981,319 US5357097A (en) | 1991-11-25 | 1992-11-25 | Method and apparatus for controlling acousto-optic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3353352A JP2976659B2 (en) | 1991-12-17 | 1991-12-17 | Method and apparatus for varying transmission width of acousto-optic filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05165071A true JPH05165071A (en) | 1993-06-29 |
| JP2976659B2 JP2976659B2 (en) | 1999-11-10 |
Family
ID=18430259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3353352A Expired - Fee Related JP2976659B2 (en) | 1991-11-25 | 1991-12-17 | Method and apparatus for varying transmission width of acousto-optic filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2976659B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08184792A (en) * | 1995-01-05 | 1996-07-16 | Nec Corp | High-speed frequency modulation signal source and high-speed variable optical wavelength filter |
| JP2006266796A (en) * | 2005-03-23 | 2006-10-05 | Anritsu Corp | Apparatus for optical heterodyne interference |
| JP2011124586A (en) * | 1999-11-17 | 2011-06-23 | Micronic Laser Systems Ab | Beam positioning in microlithography writing |
-
1991
- 1991-12-17 JP JP3353352A patent/JP2976659B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08184792A (en) * | 1995-01-05 | 1996-07-16 | Nec Corp | High-speed frequency modulation signal source and high-speed variable optical wavelength filter |
| JP2011124586A (en) * | 1999-11-17 | 2011-06-23 | Micronic Laser Systems Ab | Beam positioning in microlithography writing |
| JP2006266796A (en) * | 2005-03-23 | 2006-10-05 | Anritsu Corp | Apparatus for optical heterodyne interference |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2976659B2 (en) | 1999-11-10 |
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