Title :
Bit-error-rate impairment in hybrid AM-VSB/16-QAM multichannel video lightwave transmission systems
Author :
Ovadia, Shlomo ; Eskildsen, Lars ; Sciarabba, John T. ; Lin, Chinlon ; Anderson, William T.
Author_Institution :
Bellcore, Red Bank, NJ, USA
fDate :
7/1/1994 12:00:00 AM
Abstract :
The bit-error-rate impairment using a directly modulated DFB laser transmitter and an externally modulated YAG laser transmitter are compared in a hybrid multichannel AM-VSB/16-QAM video lightwave transmission system. A 16-QAM bit-error-rate floor at 10/sup -7/ is measured using the DFB laser transmitter (AM modulation index of 4.2%), which is much higher than the 10/sup -9/ BER floor measured for the EM-YAG laser transmitter (AM modulation index of 3.6%) with the same analog carrier-to-noise ratio and received optical power. A similar 16-QAM bit-error-rate floor at 10/sup -9/ is observed using both laser transmitters with the same AM modulation index of 3.7%. However, in this case, the analog CNR using the DFB laser transmitter is about 1.5 dB lower than that of the YAG laser transmitter.<>
Keywords :
amplitude modulation; distributed feedback lasers; errors; optical links; optical modulation; video signals; AM modulation index; BER floor; DFB laser transmitter; EM-YAG laser transmitter; YAG laser transmitter; analog CNR; analog carrier-to-noise ratio; bit-error-rate floor; bit-error-rate impairment; directly modulated DFB laser transmitter; externally modulated YAG laser transmitter; hybrid AM-VSB/16-QAM multichannel video lightwave transmission systems; hybrid multichannel AM-VSB/16-QAM video lightwave transmission system; received optical power; Bit error rate; Digital modulation; Laser noise; Optical interferometry; Optical modulation; Optical transmitters; Power lasers; Power measurement; Quadrature amplitude modulation; Video compression;
Journal_Title :
Photonics Technology Letters, IEEE
