Two New Code Families for Multiwavelength Optical CDMA Communication Systems

Multiwavelength optical code-division multiple-access (CDMA) communication system employing 2nprime-sequence codes and extended prime codes are developed. Algorithms for the constructions of these codes are also given. Discrete number of wavelengths starting from 11 to 31 (prime numbers) are chosen for the analysis and the error performance curves are obtained as a function of number of simultaneous users of the system. Considering the effect of multiple users interference (MUI) alone and comparing the performance of these code families with that of generalised multiwavelength prime codes (GMWPC), better results are obtained in the former. It is also shown that an optical hard-limiter placed before the receiver correlator reduces error probability to a large extent.