Abstract
In addition to the distortion effect due to the quadratic phase response of single-mode optical fiber, other impairments affect subcarrier multiplexed (SCM) optical transmission systems when using either semiconductor lasers or intensity external modulators at the transmitter in the case of hybrid AM/QAM channeling. In the first case several effects are considered, which give rise to different distortion phenomena: intrinsic “dynamic” distortions due to interaction of photons and electrons in a semiconductor laser, clipping impulsive noise, AM-FM conversion effect due to the joint action of semiconductor laser static and dynamic chirping and fiber chromatic dispersion, nonlinear distortions due to the Kerr effect, interferometric noise due to the joint action of semiconductor laser chirping and optical fibre multiple reflections. 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.
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