Investigation the performance of unipolar SAC-OCDMA codes

Abstract

In this paper, we investigate the performance of unipolar Spectral Amplitude Coding Optical Code Division multiple Access (SAC-OCDMA) codes. A performance comparison made between various unipolar SAC-OCDMA codes such as Random Diagonal (RD), Modified Double Weight (MDW), and Modified Quadratic Congruence (MQC) codes. Mathematical expressions have been used to analyze the bit-error rate (BER) value for each code depending on the number of simultaneous users (K), Effective Power (Psr), and Electrical Bandwidth (EB). The mathematical analysis shows that the system performance of the RD code is better than the MDW and MQC codes at -10 dBm effective power of the light source. In contrast, the MDW code shows a better performance, especially when the effective power of light source is more than -5dBm. Our results indicate that RD code provides a better performance over other SAC-OCDMA codes. In other words, The ability of RD code to support large simultaneous users with low effective power of light source appropriate it to be perfect solution to the SAC-OCDMA networks.