Performance analysis of SAC-OCDMA in free space optical medium using DDW code

Spectral amplitude coded Optical code division multiple access technique (SAC-OCDMA) has become a major area of research in optical communication. OCDMA allows multiple users to access a medium simultaneously without any contention. It has ability to operate asynchronously, provide privacy and security and reduce multiple user interference. In this paper performance of SAC-OCDMA with Diagonal double weight (DDW) code with FSO communication system is presented and compared under different conditions of rain and haze. 10 simultaneous users with 5Gbps data rate are evaluated in the system. Effect of transmitted power and beam divergence is also studied. Results have been formulated based upon eye diagrams and values of Q- factor and BER. Maximum distance covered is 10 Km with BER of 10−25 under clear weather. Simulation results show that DDW code is able to perform well at low power values also.