Security Enhancement in OCDMA System Using Multicode Keying and Data Randomisers

In this work, a super secure OCDMA system is presented which consists of data randomiser XOR gate and cipher key text generator. A new technique is demonstrated for designing of data randomiser in optical domain by using cheap components. In this a secure transmitter is designed to prevent signal loss by eavesdropper. Randomiser is placed to scramble bits after cipher text and remove sequence of consecutive three 0's and 1's to enhance performance security. The basic model of randomiser is based on XOR operation and shifting of data. Randomiser remove the long sequences, it change one bit into another bit. Advantage of randomiser is that it can be used with continuous and digital data. However encryption can only be done for digital data. For eavesdropper, it become different to tap the right data, he steal shuffle data. So security of OCDMA is enhanced.