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一、引言随着光纤通信的大规模推广应用,美、日、英、法、德等国家对发展大容量和远距离的光纤通信的兴趣日增。究其原因:其一,由于这些国家都在大力发展综合服务数字通信网(ISDN),需要用光缆来组建ISDN的传输线路;其二,在距离上光纤通信将不仅在城市之问,且将要在跨越大陆和海洋的远程上传输信息。现在普遍使用的光纤数字通信系统是利用PCM/IM和直接检测的方法。这就是发
I. INTRODUCTION With the large-scale popularization and application of optical fiber communication, there is an increasing interest in the development of large-capacity and long-distance optical fiber communications in the United States, Japan, Britain, France, Germany and other countries. The reasons are as follows: First, since these countries are making great efforts to develop integrated services digital communications network (ISDN), optical fiber cables need to be used to form ISDN transmission lines. Second, optical fiber communication over distance will not only be conducted in urban areas, Transmit information across the continent and the ocean. Now commonly used optical digital communication system is the use of PCM / IM and direct detection methods. This is hair