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在光纤数字通信系统中,NRZ非归零码和RZ归零码是最常见的基带信号。由于两者频谱成分不同,其定时时钟提取方式则不同。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,所提取出的定时时钟功率最强。
NRZ non-return to zero and RZ return to zero are the most common baseband signals in fiber optic digital communication systems. Because of their different spectral components, the timing clock extraction method is different. In this paper, spectrum analysis of NRZ and RZ pseudo-random code sequences shows that the power of the extracted timing clock is the strongest when the NRZ code is transformed into a RZ code with a symbol duty cycle of 1/2.