带阻预箝位混合光传输系统误码性能分析

The Bit Error Rate Performance of AM/QAM Hybrid Light Transmission System with Bandstop Preclamming

ＨＦＣ网在混合传输ＡＭ／ＱＡＭ信号时会因激光二极管的阈值特性产生箝位失真．因此分析了采用预箝位和带阻滤波处理对箝位失真的影响，研究了回峰的特征，计算了误码率．结果表明与低通预箝位系统相比，采用带阻滤波的预箝位系统能更有效地降低误码率．

The threshold of laser diode will produce clipping noise while transmitting simultaneously AM and QAM signals in a hybrid fiber/coax (HFC) network. The effect of using preclipping and handstop filtering on clipping distortion is discussed. The characteristic of recurring tip is studied, and the bit, error rate of the bandstop preclipping system is calculated. Numerical results show that the bandstop preclipping system can reduce more BER that the lowpass preclipping system does.