色散与损耗对无源波分在5G前传应用中的影响分析

Analysis of the influence of dispersion and loss on CWDM in 5G fronthaul application

无源波分在5G前传网络中得到了广泛的应用,但由于光纤色散在粗波分复用系统中无法忽略,且迫于成本原因没有做色散补偿,导致复用比为1:12和1:18的无源波分后6波存在较大色散代价,限制了其传输距离,成为了无源波分应用的一大瓶颈。本文从光纤色散的原理出发,结合传输链路损耗进行综合分析,给出了两者与传输距离间的关系,并根据厂家提供的参数建立覆盖模型,对常见无源波分类型进行覆盖分析,结合分析结果给出了无源波分的4种主要应用场景与使用建议。

CWDM has been widely used in 5G fronthaul network,but fi ber dispersion can not be ignored in the CWDM system,and no dispersion compensation is made due to cost reasons,which leads to a large dispersion cost in the last 6-waves of CWDM with multiplexing ratio of 1:12 and 1:18,which limits its transmission distance and becomes a major limit in the application of CWDM.This paper gives a comprehensive analysis based on dispersion principles and the loss of transmission link,revealing the relationship between dispersion,loss and transmission distance.Based on the parameters provided by the manufacturer,a coverage model is established,and coverage analysis is performed for common CWDM types.Finally,according to the analysis results,four main use cases and recommendations for use of CWDM are given at the end of the paper.