For free space optics to support multi user communications, multi-access schemes need to be incorporated. Conventional asynchronous optical code division multiple access (OCDMA) using optical orthogonal codes (OOCs) cannot deliver the required performance due to code interference, which sets a lower bound on the achievable bit error rate. Thus we introduce the use of complementary Walsh Hadamard codes as a promising solution to support synchronous OCDMA, capable of achieving required performance due to inherent interference cancellation, in addition to supporting a higher number of users while maintaining short code lengths, and alleviating some of the stringent requirements on the receiver hardware.

Date Published: 25 October 2004
PDF: 10 pages
Proc. SPIE 5598, Performance, Quality of Service, and Control of Next-Generation Communication Networks II, (25 October 2004); doi: 10.1117/12.570667

Published in SPIE Proceedings Vol. 5598:
Performance, Quality of Service, and Control of Next-Generation Communication Networks II
Frank Huebner; Robert D. van der Mei, Editor(s)