基于FTTH的CATV系统CNR的影响分析

Effect Analysis of CNR Based on FTTH CATV System

为满足半导体光放大器SOA在FTTH接入网中的广泛应用,FTTH系统中SOA噪声特性对有线电视信号CNR的影响成为一个关键的问题。首先介绍了半导体光放大器的特点,通过SOA的噪声特性、输入光功率对光纤系统中视频信号CNR劣化的影响分析,计算FTTH网络用户端的CNR,结果显示,增大SOA的输入光功率是减小CNR劣化值的最佳方法,必须在系统CNR和SOA增益之间作出权衡,以满足FTTH的光纤CATV系统的设计要求。

In order to meet the needs of SOA （ semiconductor optical amplifiers） in FTTH access network in a wide range of applications, the noise characteristics of FritH SOA effeeting on CNR of CATV signal becomes one of the key problems. First the characteristics of SOA are introduced. Through the noise characteristics, input optical power of SOA effect analysis on video signal CNR deterioration of optical system, end user CNR of FTFH network is calculated. The results showed that increase the input optical power of SOA is the best way to reduce the CNR degradation value, to meet design requirements of FTTH optical fiber CATV system must make trade - offs between the system of CNR and SOA gain.