A multi-channel multi-wavelength spectrum sliced light source for WDM free space broadcasting laser communication system

Abstract

Various wavelength-division-multiplexed (WDM) passive optical network (PON's) have been developed by using spectrum-sliced light source and multiwavelength fiber ring laser source. We design a spectrum-sliced light source for free space WDM broadcasting laser communication system. Fiber ring spectrum-sliced light source can be essentially used to develop a low-cost WDM test bed for free space light source, so it attracts lots of attentions in the wavelength-division-multiplexed (WDM) communication system. Such a wavelength-division-multiplexed (WDM) broadcasting optical networks (BON's) can have a reduced cost of using a simple structure. The spectrum-sliced amplifier spontaneous emission (ASE) light from an erbium-doped fiber amplifier (EDFA) or semiconductor optical amplifier (SOA) were proposed as a suitable light source for multi-Gb/s speed WDM applications recently. The fiber ring light source structure with spectrum slicing has been developed and it can be applied to the dense wavelength-division multiplexing (DWDM) system. And we design some squamosal ball mirrors for free space optical communication. The system is simulated by ray tracing for analyzing the refracted and scattered optical signal. When we consider the effect of Gaussian beam of the incident signal being refracted or scattered by the squamosal mirror, based on the ray tracing study, we investigate the beam uniformity for the covering area. Four cases of the ball mirror are investigated and the fractional energy of the covering range are obtained.