Abstract
A comparison is presented concerning the use of a semiconductor laser or intensity external modulator at the transmitter of hybrid AM/QAM subcarrier multiplexed optical transmission systems. In the first case, several effects are considered, which give rise to different distortion phenomena: intrinsic “dynamic” distortions due to the interaction of photons and electrons in a semiconductor laser, clipping impulsive noise, an AM–FM conversion effect due to the joint action of semiconductor laser chirping fiber chromatic dispersion, and nonlinear distortions due to the Kerr effect. In the case of an external intensity modulator, the distortion noise due to its intrinsic nonlinear response is analyzed. The analysis provides useful information about the design and the performance evaluation of SCM-based optical access networks. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 23–27, 1998.
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