Performance analysis of atmospheric optical sub-carrier multiplexing systems and atmospheric optical code division multiplexing systems

摘要

Recently, atmospheric optical communications have attracted attention in optical networks where the higher capacity is required. Since the atmospheric optical systems are constituted by simple and cheap units, it can be realized comparatively easier than the fiber-optic (FO) systems that need optical fibers. In this report, we analyze the performance of the atmospheric optical sub-carrier multiplexing (AO-SCM) systems and the atmospheric optical code division multiplexing (AO-CDM) systems. We derive the average received carrier-to-interference-plus-noise ratio (CINR) of the AO-SCM systems and the AO-CDM systems on a turbulence channel with the scintillation and the nonlinearity of an LD. We show that the received carrier-to-interference-plus-noise ratio (CINR) of the AO-CDM systems is larger than that of the AO-SCM systems when the number of channels is large, and vice versa when the number of channels is small.