Free Space Optics (Fso)

Free space optical communication links are important in many applications. The design and analysis of such link depends on appropriate modeling parameters. Opt.Sim is a useful software to implement the design parameters and examine the characteristics of the link. This work is about designing and analyzing a free space optical communication link of 50 km distance particularly in the atmosphere of Kuala Lumpur. Transmitter part consists of a PRBS generator a NRZ driver a Fabry-Perot laser diode a Mach-Zehnder modulator a semiconductor optical amplifier a collimating lens and a beam expander. FSO link has a 50 km range. The environmental additional attenuation is -4.2 dB and standard deviation of 1.9 dB. The peak noise density of this link is -181.0 dBm/Hz. Receiver part consists of a concave mirror a receiving telescope a semiconductor optical amplifier an optical filter an APD photo-detector an electrical amplifier and an electrical filter. The availability of the system is analyzed by measuring the output power spectrum power bit-error-rate and eye diagram at the receiver of FSO.