Phase-induced intensity noise suppression wavelength-time modified double weight codes optical code division multiple access systems

Abstract

The wavelength-time modified double weight (MDW) optical division multiple access (OCDMA) scheme to compensate bit error rate (BER) and phase-induced intensity noise (PIIN) in incoherent OCDMA systems is proposed. The analysis permits thorough understanding of PIIN, shot and thermal noises effect on 2-Dimensional (2-D) MDW OCDMA system performance. PIIN is the dominant noise factor in the OCDMA timespreading scheme. The 2-D MDW code shows better tolerance to PIIN in comparison to others with enhanced system performance. 2-D PDC and 2-D MQC OCDMA code.

Noise mitigation for OCDMA system with wavelength/time 2D hybrid code

“…The system performance decreases as the increasing of the number of simultaneous users. Indeed, PIIN noise has influences the BER due to the high interference when the code sequences increased [6]. Fig.…”

“…Essentially, the system performance reigned by PIIN which caused by the incoherent mixing of lightwaves at each photodiode [7]. Similarly, [6] described that intensity noise is the noise at detector that arises from the spontaneous nature of incoherent light.…”

“…The code sequences with low cross correlations are introduced in order to minimize MAI. Furthermore, specifically in Spectral Amplitude Coding (SAC) OCDMA the Phase Induced IntensityNoise (PIIN) is the crucial drawback which contributes to the limitation of maximum number of simultaneous active users [5][6][7]. Essentially, the system performance reigned by PIIN which caused by the incoherent mixing of lightwaves at each photodiode [7].…”