光纤AM-CATV系统附加相位调制法的研究  

Study on the method of additional phase modulation in fiber optic system with external modulation

作　　者：杨建良[1] 查开德[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电视技术》1999年第5期36-38,共3页Video Engineering

摘　　要：对外调制光纤ＡＭ－ＣＡＴＶ系统中的附加相位调制法抑制ＳＢＳ的原理，以及相位调制法抑制ＳＢＳ时光纤ＡＭ－ＣＡＴＶ中的非线性失真与噪声进行了详细分析与计算，发现附加相位调制对系统的多径干扰（ＭＰＩ）噪声有一定的抑制作用，而且只要相位调制信号的频率大于２倍的ＣＡＴＶ频带的最大频率，色散引起的非线性失真还可以忽略不计。This paper presents the principle of using additional phase modulation to supress SBS in exter-nally modulated AM-CATV system and detailed analysis and calculation of nonlinear distortion and noise in fiberoptic AM-CATV when phase modulation is used to supress SBS. It is found that additional phase modulation su-presses multipath interference in the system to a certain extent. As long as the frequency of phase modulation sig-nal is greater than 2 times of the highest frequency of CATV frequency band, nonlinear distortion resulted fromdispersion is neglegible.

关 键 词：相位调制 受激布里渊散射 光纤AM-CATV 

分 类 号：TN943.5[电子电信—信号与信息处理] TN761[电子电信—信息与通信工程]