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4超长距离数字调制光纤CATV传输系统4.1数字调制光纤CATV传输系统的MER指标在数字通信系统中,误码率BER是一个主要的指标,一般数字光纤传输系统的BER会达到10-12以下。对于DVB-C等数字CATV传输系统,采用BER作为指标是不合适的,因为加上纠错功能,系统整体误码率会在10-19以下,使前端和用户端的BER测量
4 long distance digital modulation optical fiber CATV transmission system 4.1 MER index of digital modulation optical fiber CATV transmission system BER in digital communication system is a major index, the general digital optical transmission system BER will reach below 10-12. For DVB-C and other digital CATV transmission system, the use of BER as an indicator is not suitable because of error correction function, the system will be the overall bit error rate of 10-19, the front-end and client BER measurements