Ultrafast signal multiplexing and switching

需要光通信技术来满足干线传输系统和接入网的要求。超快信号传输给驱动电子技术带来了越来越大的负担。光交换和复用与功能电子电路相结合可以为这一瓶颈提供合理的解决方案。我们进行了与这个问题直接相关的基础研究课题的研究：（1）超短脉冲源的开发，（2）由CMOS和横向引脚PD组成的功能光电集成电路（OEIC）的设计。在脉冲产生方面，我们将增益开关半导体激光器与多级光纤脉冲压缩器相结合。利用光纤中的孤子效应，我们实现了 500 的压缩比，从而达到 65 fs，这是从半导体激光源开始的记录脉冲宽度。对于OEIC来说，新设计的横向引脚光电二极管可以通过CMOS电路的标准制造工艺来制造。该制造是由一家合作公司进行的。 OEIC的作用是补偿时钟偏差。检查制造的芯片并确认基本特性。

Optical communication technology is needed to respond to the requirments both from trunk transmission systems and from acces network. Ultrafast signal transmission puts increasing burden on the driving electronics technology. Optical switching and multiplexing, when combined with functional electronic circuits may offer a reasonable solution to this bottleneck. We have conducted the study of basic research topics directly related to this problem : (1) development of ultrashort pulse source, (2) design of functional optoelectronic integrated circuit (OEIC), composed of CMOS and lateral pin PD.As for the pulse generation we compbined gain-switched semiconductor laser with multi-stage fiber-optic pulse compressor. Utilizing soliton effect in optical fiber we achieved the compression ratio of 500, resulting in 65 fs, the record pulse width starting from semiconductor laser source. As for OEIC,newly designed lateral pin photodiode can be fabricated by the standard manufacturing procedure of CMOS cirsuits. The fabrication was conducted by a collaborating company. The function of the OEIC is the compensation of clock skew. Fabricated chips are examined and the basic characteristics are confirmed.