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This paper has clarified the simulative study of advanced modulation techniques based discrete–lumped Raman optical amplifiers for high bandwidth capability of free space optics communication system. The work studies how free-space optical (FSO) systems work in rain with advanced different modulations schemes and wavelengths. The spectral infrared operating wavelengths are employed through this FSO channel system. Output modulated power and visibility range are demonstrated versus the spectral operating wavelength and various rain weather conditions at the optimum FSO channel length based on different modulation schemes. The optimum visibility range can be achieved at 16-QAM modulation technique compared to other modulation techniques. Signal per noise ratio and bit error rates are studied and simulated against the link range based FSO channel and various spectral operating wavelengths at different rain weather conditions.

Advanced modulation techniques based discrete–lumped Raman optical amplifiers for high bandwidth capability of free space optics communication system