光纤数字系统中同步时钟提取电路设计

The circuit design for obtainning synchronous clock frequency in digital communication

本文通过对NRZ、RZ伪随机码序列进行频谱分析 ,得知当NRZ码变换成码元占空比为 1 / 2的RZ码时 ,所提出的同步时钟功率最强。并根据得出的结论提供一实际运用的设计电路。

NRZ (Non-Return-to-Zero) code is a kind of general base signal in optical digital communication systems NRZ code doesn't contain synchronous clock frequency. In order to obtain it, NRZ code must be processed nonlinearly and transferred into RZ codes. By analyzing the frequency spectrum in this paper, we can understand that when an NRZ code is transferred into the RZ code of 1 / 2 mark-to-space ratio. The synchronous clock can be obtained at its largest value. A practically circuit design is provided with basing on the conclusion here.