Performance Measure of FSO by Modified AND Subtraction Method

Free space optical (FSO) communication system plays a vital role in the optical communication which employing the spectral amplitude coding optical code division multiple access (SAC OCDMA) technique in various fields of application. Multiple-Access Interference (MAl) and Phase-Induced Intensity Noise (PIIN) which are the major noises in incoherent SAC-OCDMA systems, which degrades the performance of the entire system.The technique called Modified AND subtraction which applied here to eliminate the MAI and PIIN.This Modified AND Subtraction technique investigate the APD gain impact on the bit-error rate (BER) performance and by implementing the single photodiode technique(SPD) here.In bad weather condition the performance degradation should be reduced by giving priority to the transmission parameters and achieve the high data rate transmission with low bit-error rate. The Modified AND Subtraction-FSO communication system is compare with the FSO system employing SAC OCDMA SDD technique. The results of this study show that the performance of the proposed system is better than the system employing the SAC OCDMA-SDD technique.