Optical code-division multiple-access coding architecture with 2n prime-sequence codes

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 2 n " coding architectures, respectively, for the prime-sequence and 2 n codes have been proposed to improve the power-efficiency.1,4 Recently, "2 n primesequence" codes, a collection of symmetric binary sequences with weight 2 n , 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 2 n decoder, is proposed to substantially reduce the power loss, cost, and complexity of the systems using optical CDMA.