1、引言在传输路径终端或一个中间再生器中的光接收机的作用是把光信号变为电信号。为使发射机和接收机之间的允许损耗即距离最大,接收机应有高的效率、快的响应和低的噪声,以便用最小的接收光功率获得要求的信号噪声比及误码率性能。此外,接收机应能于电源便利的环境温度中工作,并且应当是小型的、轻量的、可靠的和廉价的。 1. Introduction The function of an optical receiver in the transmission path terminal or in an intermediate regenerator is to convert the optical signal into an electrical signal. In order to maximize the allowable loss between the transmitter and the receiver, the receiver should have high efficiency, fast response and low noise to achieve the required signal-to-noise ratio and bit error rate performance with the minimum received optical power . In addition, the receiver should be able to operate at a convenient ambient temperature and be small, lightweight, reliable and inexpensive.