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Digital channel degradation in a hybrid multichannel AM/16QAM video lightwave system

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Abstract

Hybrid multichannel analog/subcarrier-multiplexed digital video lightwave transmission systems are a promising choice for future video delivery systems. Such systems can deliver existing, largely analog video services while allowing the development of new compressed digital video and data services. The digital signals are much more robust and spectrally efficient than are the analog signals. However, the digital signals may be degraded by nonlinearities (such as clipping distortion) in the optical transmitter, which is typically a directly modulated laser.1·2 In this paper we compare the 16QAM channel performance of two different transmitter types, a directly modulated distributed-feedback (DFB) laser and an externally modulated YAG laser, for transmitting a 16QAM digital-subcarrier channel combined with 60 analog video carriers. We find that the 16QAM link penalty is almost an order of magnitude larger for the DFB-laser system than for the YAG-laser system with the same 16QAM modulation index and the same analog carrier-to-noise ratio.

© 1994 Optical Society of America

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