Modulation Bandwidth Control of Light Modulator and its Application

光调制器的调制带宽控制及其应用

• 批准号: 10650048
• 负责人: MORIMOTO Akihiro
• 金额: $ 2.11万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650048/
• 关键词: Light Modulator; Ultrafast; Domain Inversion; Bandwidth; LiTaO3; Phase Modulation; Sideband Generation; Femtosecond; 電気光学変調; 疑似速度整合; LiTaO_3; 非周期; 変調帯域; テラヘルツ

Periodic domain inversion of electrooptic crystals makes quasi-velocity-matching possible between light and microwave velocities in collinear microwave light modulator and provides large phase modulation index enough for generating femtosecond light pulses. In this research, we investigated the control of modulation bandwidth and band-shape by changing domain inversion pattern on the electrooptic phase modulator from simple periodic rectangles. We found some useful patterns of domain inversion that are suitable for wideband flat microwave modulation and an efficient modulator for specific two microwave frequencies by theoretical calculation. Domain inversion of electrooptic crystals was investigated for precise domain control. Charge control was quite important, so we employed current monitoring system for automatic domain control. We investigated novel domain pattern for ultrafast light control. We developed a diffractive optical modutator at a microwave frequency of which operation is similar to AOM. A guided wave modulator developed with domain inversion was suitable for ultrafast light pulse generation. All devices were optical sideband generators at microwave frequencies and the spectral control with dispersive devices makes ultrafast light pulse control possible.

电光晶体的周期性畴反转使得共线微波光调制器中光与微波速度的准速度匹配成为可能，并为产生飞秒光脉冲提供了足够大的相位调制指数。在本研究中，我们研究了通过改变简单周期矩形电光相位调制器的畴反转模式来控制调制带宽和带形。通过理论计算，我们找到了一些适用于宽带平坦微波调制和特定两个微波频率的有效调制器的有用的畴反转模式。研究了电光晶体的畴反转以实现精确的畴控制。电荷控制非常重要，因此我们采用电流监测系统进行自动域控制。我们研究了一种用于超快光控制的新型畴图。我们研制了一种微波频率的衍射光调制器，其工作原理与AOM相似。利用畴反转技术研制的导波调制器适用于超快光脉冲的产生。所有器件都是微波频率的光边带发生器，色散器件的光谱控制使超快光脉冲控制成为可能。

项目成果

D.-S. Kim: "Ultrashort Optical Pulse Shaping by Electrooptic Synthesizer"IEICE Trans. Electron.. E81-C,2. 260-263 (1998)

D.-S。

A.Maruko: "Ultrafast Electrooptic Traveling Phase Grating with Periodic Domain Inversion" 1999 CRL Int'l Symp.on Optical Commun.and Sensing,Tokyo. C-7 (1999)

A.Maruko：“具有周期域反转的超快电光行相光栅”1999 CRL Intl Symp.on Optical Commun.and Sensing，东京。

森本朗裕: "レーザー工学,中井 編,第3章"オーム社. 250 (1999)

Akihiro Morimoto：“激光工程，Nakai 编辑，第 3 章”Ohmsha (1999)。

T.Kobayashi and A.Morimoto: "Femtosecond Technology eds.T.Yajima, et al."Springer-Verlag. 1999.

T.Kobayashi 和 A.Morimoto：“飞秒技术 eds.T.Yajima 等人”Springer-Verlag。

森本朗裕: "電気光学位相格子とその応用"輻射科学研究会資料. RS99-9. 1-16 (1999)

Akihiro Morimoto：“电光相位光栅及其应用”辐射科学研究组材料 RS99-9 (1999)。