Study of Ultra-High-Speed(Tera-Hertz) Optical Signal Control and Optical Pulse Synthesis.

超高速（太赫兹）光信号控制与光脉冲合成研究。

基本信息

批准号：
62460067
负责人：
KOBAYASHI Tetsuro
金额：
$ 4.29万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

We have developed new optical pulse generation / synthesis systems, which make it possible to control electrically optical signals in the picosecond to subpicosecond range without the limitation of the bandwidth of an electrooptic modulator. First, phase modulation with the very high modulation index is employed to produce wide optical sidebands spread over terahertz region. Then, the amplitudes and phases of sideband-components are individually controlled in the frequency space so as to from objective temporal pulse shapes. Theoretical discussions and fundamental experiments have been carried out. As results, usefulness of our synthesis systems in the picosecond range have been confirmed.In the first research year, we developed new electrooptic phase modulators using a microstrip resonator, and achieved a modulation index of 10 rad. (sideband spread -- 640 GHz). With a pair of gratings, this modulated "CW light" was directly compressed into "a few picosecond pulses". Moreover, we deve … More loped a simple optical synthesizer using a Fabry-Perot interference filter as a sideband selector, and succeeded in generating picosecond optical pulses with 10-75GHz repetition rate.In the 1988 year, our research proceeded to a novel optical synthesizer, which makes it possible to generate arbitrarily-shaped optical pulses. The synthesizer is composed of a spatial sideband-separator with a grating and a Fourier transform lens, a spatial sideband-controller using a spatial filter or a modulator array, and a sideband-multiplexer (just the reverse of the separator). With spatial masks to select appropriate sidebands, variously shaped pulses were obtained in the 10 ps range as predicted by the theoretical calculation. With a parabolic phase sifter (lens), we succeeded in the picosecond pulse compression. Moreover, the preliminary experiment using a liquid crystal optical shutter array was carried out to realize programmable control of picosecond pulse shapes. The possibility of a optical binary word generator with the terabit/s rates also discussed.In conclusion, we have succeeded in developing novel type of ultrafast pulse generation / synthesis methods which are purely electrooptical and applicable to any CW/pulsed laser. Further development of this study should make it possible to realize even a femtosecond electrooptic systems. Less

我们开发了新的光脉冲生成/合成系统，可以在皮秒到亚皮秒范围内控制电光信号，而不受电光调制器带宽的限制。产生了覆盖太赫兹区域的宽光学边带，然后在频率空间中单独控制边带分量的幅度和相位，从而形成客观的时间脉冲形状。结果，我们的合成系统在皮秒范围内的实用性得到了证实。在第一个研究年，我们使用微带谐振器开发了新型电光相位调制器，并实现了 10 rad 的调制指数（边带扩展 - 640）。 GHz）。通过一对光栅，这种调制的“连续光”被直接压缩成“几个皮秒脉冲”。此外，我们使用一个简单的光学合成器。法布里-珀罗干涉滤光片作为边带选择器，成功地产生了重复频率为10-75GHz的皮秒光脉冲。1988年，我们的研究进展到一种新型光合成器，使得产生任意形状的光脉冲成为可能。该合成器由带有光栅和傅立叶变换透镜的空间边带分离器、使用空间滤波器或调制器阵列的空间边带控制器以及边带多路复用器（与分离器相反）使用空间掩模来选择适当的边带，按照理论计算的预测，我们成功地获得了 10 ps 范围内的各种形状的脉冲。此外，还进行了使用液晶光学快门阵列的初步实验，以实现太比特/秒速率的光学二进制字发生器的可能性。总之，我们已经成功开发出新型超快脉冲生成/合成方法，该方法是纯电光的，适用于任何连续波/脉冲激光器，这项研究的进一步发展应该使得实现飞秒电光系统成为可能。较少的