Title :
Performance of hybrid multichannel AM/256-QAM video lightwave transmission systems
Author :
Ovadia, Shlomo ; Dai, Hongxing ; Lin, Chinlon ; Anderson, William T.
Author_Institution :
Bellcore, Red Bank, NJ, USA
Abstract :
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-QA 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.<>
Keywords :
amplitude modulation; distributed feedback lasers; error correction codes; multi-access systems; optical fibre subscriber loops; optical modulation; optical transmitters; quadrature amplitude modulation; semiconductor lasers; television networks; video signals; 64-QAM signal performance; BER characteristics; CW carriers; directly-modulated DFB laser transmitter; externally-modulated YAG laser transmitter; forward-error-correction code; hybrid multichannel AM/256-QAM video lightwave transmission systems; impulse noise; modulated AM-VSB video signals; modulated video signals; robust 256-QAM transmission; Bandwidth; Bit error rate; Laser modes; Laser noise; Modems; Optical transmitters; Quadrature amplitude modulation; Robustness; Signal generators; Video compression;
Journal_Title :
Photonics Technology Letters, IEEE
