PERFORMANCE OF HYBRID MULTICHANNEL AM/256-QAM VIDEO LIGHTWAVE TRANSMISSION-SYSTEMS

被引:15
作者
OVADIA, S
DAI, HD
LIN, CL
ANDERSON, WT
机构
[1] Bellcore, NJ 07701, Red Bank
关键词
Forward error correction code - Hybrid multichannel video lightwave transmission systems - Impulse noise - Laser transmitter - Modulation index - Video signals;
D O I
10.1109/68.473495
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We report experimental results on the performance of a multichannel hybrid AM/256-QAM video lightwave transmission system. Performance limitations due to impulse noise using a directly-modulated DFB laser transmitter and an externally-modulated YAG laser transmitter are presented. We also compared the BER characteristics of 256-QAM versus 64-QAM signals with either CW carriers or modulated video signals in such a hybrid system. Our results indicate that 64-QAM signal performance is more robust than that of 256-QAM as expected. Significant 256-QAM BER degradation is observed with modulated AM-VSB video signals, making it necessary to use forward-error-correction code for robust 256-QAM transmission.
引用
收藏
页码:1351 / 1353
页数:3
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