NRZ伪随机码序列同步时钟提取

Obtaining the NRZ False Random Code Synchronous Clock

在光纤数字通信系统中，ＮＲＺ非归零码是一种最常见的基带信号。它本身不含有位同步时钟分量。只有对其进行非线性处理，转换成ＲＺ归零码后，方可提取出同步时钟。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，所提取出的同步时钟功率最强。

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 and transferred into RZ codes. By analysing 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.