本文略述了长波长1.3μm140Mb/s光纤传输系统全部线路编码要求,给出了5B6B和7B8B这两种字组码选择的结果。因而对于这些线路码的参数作了详细的研究,并且对两种编码进行了比较。本文也证明了虽然5B6B码和7B8B码的差别很小,但根据电路的复杂性和功耗情况,5B6B码更优良的结论。 This article outlines the coding requirements for all the lines in a long wavelength 1.3μm 140Mb / s optical fiber transmission system and gives the results of the two block codes 5B6B and 7B8B. Therefore, the parameters of these line codes were studied in detail, and the two codes were compared. This paper also proves that although the difference between 5B6B code and 7B8B code is very small, 5B6B code is more excellent conclusion according to circuit complexity and power consumption.