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1 前言 光纤有线电视系统主要由光发射机、光缆、光纤放大器、光接收机等设备组成。光发射机的作用是将有线电视信号转换为光纤中传输的光信号。光接收机是将光信号再转换为电信号送给用户,光缆主要用来长距离传输光信号。在长距离传输信号过程中,为了保证信号的传输质量,需要在信躁比尚不太下降时,即进行传输损耗的补偿,以提高信号的电平,扩大信号的传输距离,这就需要中继放大器。光纤放大器即为将光信号放大的设备。
1 Preface Optical fiber cable television system is mainly composed of optical transmitter, optical cable, optical fiber amplifier, optical receiver and other equipment. The function of an optical transmitter is to convert a cable television signal into an optical signal transmitted in an optical fiber. Optical receiver is the optical signal is then converted to electrical signals to the user, the optical cable is mainly used to transmit optical signals over long distances. In the long-distance signal transmission process, in order to ensure the quality of the signal transmission, the signal-to-noise ratio is still not too decreased, the transmission loss compensation, in order to improve the signal level, to expand the signal transmission distance, which requires Following the amplifier. Fiber amplifier is the optical signal amplification equipment.