Generation of Ultrabroad Optical Sideband by Domain-Inversed Waveguide-Type Electro-Optic Modulators and Applications

反畴波导型电光调制器产生超宽带光边带及应用

基本信息

批准号：
12450031
负责人：
KOBAYASHI Tetsuro
金额：
$ 8.38万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450031/
关键词：
Domain Inversion Up side Down Ultrafast Light Control Terahertz Light Light Waveguide femtosecond Optical Pulses Frequency Comb WDM (Wavelength Division Multiplex)Sideband 光変調器光サイドバンド短光パルス光導波路電気光学効果光周波数コム発生器光シンセサイザ

项目摘要

The purpose of this study is to develop new kinds of electro-optical modulators together with domain inverted structure and wave-guide structure and to generate ultra-broad optical sideband and to find out new application of them. As results, we succeeded in materialization of the frequency comb generator which is very useful as light sources in the wavelength division multiplexing (WDM) system, of the frequency shifter, a single sideband (SSB) modulator and the compact integrated femtosecond optical pulse generators.Adopting the waveguide structure makes it possible to decrease driving electric power drastically. The geometrical spatial modification of the domain-inverted structure makes multipath parallel operation of the modulator or various types of spatial light modulation possible.First of all, the length and the width of the electrode and the optical waveguide were devised for the ultra-broad sideband generation, the frequency comb generator, and application to the light source … More in the WDM system, which require high modulation efficiency. As a result, efficient cw modulation and generation of broad cw optical sidebands became possible. The position shift of domain inverted area yields equivalently the phase shift of modulation rf signals, therefore, we can get sin and cos modulation by single rf signal. Using this effect, we constructed new kind of SSB modulator with simple wave-guide structure and succeeded in confirmation of its SSB operation.The sidebands obtained by a usual phase modulation have Bessel function-like amplitude and lack in flatness. It is problem for frequency comb generator. We proposed the new spatial modulator, spatially separated sideband generator with flat distribution, which is constructed by adding the spatial deform to traveling phase grating produced by tilted periodic domain inverted structure. Moreover, we succeed in the composition of the ultra-broadband modulator by adopting the non-periodical domain inverted structure. The modulation bandwidth (-1 dB) of this device was estimated to be six times wider than that of the normal traveling-wave EO modulator. In addition, we integrated the phase modulator for the ultra-broad sideband generation and the group delay dispersion circuit on one LiTaO_3 tip. In preliminary experiment using this integrated device we succeeded in direct conversion from the continuous light-wave into the picosecond pulses. Less

这项研究的目的使超大号光学边带充满活力，并且为了找出新的应用，我们在频率梳子发生器的实质化中sc脚，这是波长多路复用（WDM）系统的光源非常有用频率变速器，单个侧带（SSB）调制器和紧凑的飞秒光秒脉冲发生器。使波导结构可大大降低电源的驱动力或各种类型的uide的首先是为了达到超大的侧带生成效率。信号，因此使用此效果，我们用简单的波型结构构建了新型的SSB模块，并成功地确认了SSB操作。平坦的分布是由倾斜的周期性域倒置结构产生的空间变形，该结构是通过采用非晶状体域倒置结构来构建的。在一个litao_3尖端上，使用该集成的设备在一个litao_3的尖端上，我们的the eo tayer teartion superation 。