以低损耗石英光纤的开发为背景,这二十年间,在通信和信息处理系统中,“光”的利用有了急速的进展,现在光系统已广泛地实用化了。在这些系统中,半导体激光器和光电二极管等光半导体器件作为关键器件而被采用,并正进一步向着系统的高速化、大容量化、多信道化和包括信号处理复杂化在内的多功能化,进行着积极的开发。对这些光半导体器件的要求,大多都能用光半导体器件和电子电路的集成化(OEIC)来满足。本来半导体器件就是借助于电子电路进行工作的,但是在过去的系统中,存在技术方面的限制,就是由于在两者接口 With the development of low-loss quartz fiber as the background, the utilization of “light” has rapidly progressed in the communications and information processing systems over the past two decades. Now the optical system has become more and more practical. In these systems, optical semiconductor devices such as semiconductor lasers and photodiodes are adopted as key devices, and further, multi-functions such as speedup, capacity increase, multi-channelization of the system and complication of signal processing are further introduced, Active development. The requirements for these optical semiconductor devices are mostly satisfied by the integration of optical semiconductor devices and electronic circuits (OEICs). Originally, semiconductor devices were operated by means of electronic circuits. However, in the past systems, there were technical limitations because the two interfaces