New method for developing optical code division multiplexed access sequences using genetic algorithm

A new method for developing optical code division multiplexed access (CDMA) address code sequences is presented. The method is based on the genetic al gorithm, which has already shown success in developing two-dimensional corr elation functions for pattern recognition. The algorithm is very flexible i n its optimization criteria and is thus adequate for various optical CDMA a pplications, including coherent and noncoherent systems. Preliminary comput er experimental results are presented that indicate very good discriminatio n ratios and very fast convergence of the search process. important implica tions include synchronization-independent CDMA system design, reduction in optical beat noise, optical power budget improvement, and enhanced security . (C) 1999 Society of Photo-Optical Instrumentation Engineers. [S0091-3286( 99)01901-7].