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一、引言在过去五年中,外差(或零拍)和相干光纤通信的开发研究迅速扩大。这主要是因为接收机灵敏度有可能改善以致无中继距离的延长(用λ=1.55μm,可达100km),部份是由于有可能实现频率间隔十分良好的(典型为10—100GHz)频分复用。在中频
I. INTRODUCTION In the past five years, research and development on heterodyne (or zero-beat) and coherent optical fiber communication has rapidly expanded. This is mainly due to the possibility that the receiver sensitivity may be improved so that the extension of the no-relay distance (up to 100 km for λ = 1.55 μm) is partly due to the possibility of achieving very good (typically 10-100 GHz) frequency separation Reuse. In the middle frequency