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一、引言所谓光纤通信就是利用光波在光导纤维中传递信息的一种通信方式。目前光纤通信系统中最重要的光源是半导体激光器或发光二极管,接收器件是半导体APD或PIN光电探测器。由于光纤通信具有容量大、抗电磁干扰、保密性强、原料资源丰富等许多独特的优点而受到极大重视,各国都在加紧研究,进展极为迅速。宽带超大容量的通信系统可以开辟许多新的通信业务。除了电视电话、图象传真、联播电视网等模拟通信系统之外,随着计算技术和自
I. Introduction The so-called optical fiber communication is the use of light waves in optical fiber transmission of information in a way of communication. At present, the most important light source in the optical fiber communication system is a semiconductor laser or a light-emitting diode. The receiving device is a semiconductor APD or a PIN photodetector. Due to its unique advantages such as large capacity, anti-electromagnetic interference, strong confidentiality and abundant raw material resources, optical fiber communication has drawn great attention. All countries are stepping up their studies and making rapid progress. Broadband communications systems with large capacity can open up many new communications services. In addition to analog communication systems such as videophones, image faxes and simulcast networks, with the advent of computing technology and