Title :
On the construction of 2/sup n/ codes for optical code-division multiple-access
Author :
Guu-Chang Yang ; Kwong, Wing C.
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Taichung, Taiwan
Abstract :
An optical orthogonal code (OOC), intended for optical code-division multiple-access (CDMA), is a collection of (0,1) sequences with good correlation properties (i.e., high autocorrelation peaks with low sidelobes, and low crosscorrelation values). A "serial" coding architecture for optical CDMA has been introduced and found particularly suitable for waveguide implementation with high power efficiency. Since the optical encoder is made of a serial combination of 2/spl times/2 optical switches with n of them being biased to a "mix-split" state, the generated OOC\´s, so-called 2/sup n/ codes, pose with a symmetric delay-distribution property. Various techniques for algebraically constructing such 2/sup n/ codes of weight 4 are presented. The upper bounds on the cardinalities of these codes are also provided.<>
Keywords :
algebraic codes; code division multiple access; codes; encoding; optical correlation; optical fibre communication; optical fibre networks; optical switches; optical waveguides; 2/sup n/ codes; algebraically constructed codes; cardinalities; code weight; correlation properties; high autocorrelation peaks; high power efficiency; low crosscorrelation values; low sidelobes; optical code-division multiple-access; optical encoder; optical fibre CDMA networks; optical switches; serial coding architecture; symmetric delay-distribution; upper bounds; waveguide implementation; Autocorrelation; Delay; Multiaccess communication; Optical switches; Optical waveguide components; Optical waveguides; Upper bound;
Journal_Title :
Communications, IEEE Transactions on
