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"Optical Gating by Ultrashort Pulse for High Quality Signal Detection and Demultiplexing"

“通过超短脉冲进行光选通，实现高质量信号检测和解复用”

基本信息

批准号：
11650342
负责人：
KAMIYA Takeshi
金额：
$ 1.86万
依托单位：
National Institution for Academic Degrees (Daigaku-hyoka Gakui-juyo Kiko) (2000)The University of Tokyo (1999)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The next generation optical communication should support the demand of switching arbitrarily among optical channels as well as allocating broad bandwidth to individual users. Therefore high quality and simple optical device technology is required in access networks. We tried to implement a novel scheme of optical signal detection by combining such emerging technologies as ultrashort pulses, all optical switches, and micro-optics.Major achievements by this investigation are as follows :(a) Design and test fabrication were performed on a glass optical platform employing diffractive optical elements for all optical switch array. At the switch position the beam overlap between the trigger light and the signal light was excellent. (JJAP March 2000)(b) Multi-quantum well saturable absorber switches were mounted on the glass platform, and the switching experiment was performed using gain switched semiconductor laser pulses of 25 picosecond in pulse width. The switching sensitivity was comparable with the conventional free space illumination configuration. With the addition of the compactness and robustness of the present scheme, it is more promising for practical applications. (IEICE Trans. March 2001)(c) We proposed a new scheme of improving signal to noise ratio in detecting the pulse-position-modulated codes by optical gating technique, under the assumption that the signal is delivered by low duty ratio RZ signal stream. A simulation will be presented at CLEO2001 in May 2001.

下一代光通信不仅要支持光信道间的任意切换，而且要为每个用户分配宽带。因此，接入网中需要高质量和简单的光器件技术。本论文尝试将超短脉冲、全光开关和微光学等新兴技术相结合，实现一种新型的光信号检测方案，主要研究成果如下：（a）设计并制作了一种基于衍射光学元件的全光开关阵列玻璃光学平台。在开关位置，触发灯和信号灯之间的光束重叠非常好。(JJAP 2000年3月）（B）将多量子阱可饱和吸收体开关安装在玻璃平台上，并且使用脉冲宽度为25皮秒的增益开关半导体激光脉冲进行开关实验。开关灵敏度与传统的自由空间照明配置相当。由于该方案的紧凑性和鲁棒性，使其更有应用前景。（3）提出了一种利用光选通技术提高脉位调制码检测信噪比的新方案，该方案假设信号是由低占空比RZ信号流传输的。将在2001年5月举行的CLEO 2001会议上提出一个模拟方案。