Cardinality enhancement of spectral/spatial modified double weight code optical code division multi-access system by PIIN suppression

• Published in: Optik (Stuttgart) 2013-10, Vol.124 (19), p.3786-3793
• Main Authors: Arief, A.R., Aljunid, S.A., Anuar, M.S., Junita, M.N., Ahmad, R.B.
• Format: Article
• Language: English
• Subjects: Cancellation; Division; Modified double weight; Multi-access interference; Multiple access; Optical code division multiple access; Optical properties; Phase-induced intensity noise; Power transmission; Spectra; Two dimensional; Wavelengths
• ISSN: 0030-4026; 1618-1336
• DOI: 10.1016/j.ijleo.2012.11.061

A new two-dimensional (2-D) optical code division multiple access (OCDMA) scheme to increase the achievable system capacity is proposed. The code exhibits good cross-correlation property time and wavelength shift. Performances are analyzed on code size and correlation properties affecting two important system parameters, bit error rate (BER) as a function of cardinality generated and optical power transmission requirement. The proposed system can effectively suppress phase-induced intensity noise (PIIN) and has multi-access interference (MAI) cancellation property. Results in a good agreement indicate that 2-D modified double weight (MDW) offers 163.7% and 336.2% larger cardinality compare to 2-D perfect difference code (PDC) and 2-D modified quadratic congruence (MQC) code. By increasing spatial code (N) and keeps similar code length system performance can be further optimized. 2-D MDW (M=45, N=18) accommodates 252.2% and 18.3% cardinality increment and low effective transmitted power (Psr) at −17.9dBm, compare to 2-D MDW (M=247, N=3) and (M=84, N=9) at 10−9 BER error floor. The architecture of the spectral/spatial MDW OCDMA system with property of MAI cancellation is presented.