Abstract

Recent study¹ shows that the performance of an optical code-division multipleaccess (CDMA) network cannot be evaluated by only considering the correlation properties of the selected optical pseudo-orthogonal codes.^2,3 The coding architecture (i.e., the structures of the optical encoders and decoders) is another important factor to consider, since it affects the power budget and feasibility of the system. As a result, "tunable prime" and "modified 2ⁿ" coding architectures, respectively, for the prime-sequence and 2ⁿ codes have been proposed to improve the power-efficiency.^1,4 Recently, "2ⁿ primesequence" codes, a collection of symmetric binary sequences with weight 2ⁿ, have been introduced and pose the pseudo-orthogonal and algebraic properties of the original prime-sequence codes.⁵ To effectively utilize these codes, a novel coding architecture, which consists of a "modified" tunable prime encoder and a 2ⁿ decoder, is proposed to substantially reduce the power loss, cost, and complexity of the systems using optical CDMA.

© 1994 IEEE