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随着通信技术的迅速发展，光纤通信正向着长距离、长波长、高速率和大容量的方向发展。以往只关心衰减限制系统的传输变为必须同时关心色散限制系统的传输了。本文根据目前光纤通信技术水平以及ＣＣＩＴＴ有关规定，结合工程实例，分别从衰减限制和色散限制两个方面阐述光纤通信系统中继段长的计算方法。特别是在确定超长中继距离时，如何恰当选取计算参数作较为详细的分析。最后对使用不同光纤类型、工作波长和传输速率所能达到的最长中继距离提出一些看法。
With the rapid development of communication technology, optical fiber communication is developing in the direction of long distance, long wavelength, high speed and large capacity. In the past, only the transmission of attenuation limiting systems became concerned with the transmission of dispersion limiting systems. In this paper, according to the current level of optical fiber communication technology and the relevant provisions of CCITT, combined with engineering examples, elaborated from the attenuation limit and dispersion limits of optical fiber communication system, the length of the calculation of the relay section. Especially in the determination of long distance relay, how to properly select the calculation parameters for a more detailed analysis. Finally, some opinions on the longest relay distance that can be achieved using different fiber types, operating wavelength and transmission rate are given.