This paper presents the Direct Sequence Optical Code Division Multiple Access (DS-OCDMA) system using two configurations of the optical source. To encode/decode transmitted data, we used Superstructured Fiber Bragg Grating (S-FBG) as encoders/decoders. We consider three unipolar family codes which are the Prime Sequence (PS), Quadratic Congruence (QC) and the Extended Quadratic Codes (EQC) codes. In order to evaluate the performances of our system in term of Bit Error Rate (BER), we implement the Importance Sampling (IS) technique, which is a variant of the wellknown Monte-Carlo (MC) method. Our simulation results depict that EQC codes outperform QC and PS codes for the DS-OCDMA system using either coherent or incoherent source. We show also that using EQC codes with increasing the optical bandwidth and maintaining the electrical filter leads to improve the performance of incoherent system.
Amel Farhat Mourad Menif Catherine Lepers Houria Rezig Philippe Gallion
Ecole Nationale d’Ingénieurs de Tunis,Laboratoire SYSCOM,BP.37,Le Belvédère,1020,Tunisia;Institut TE Ecole Supérieure des Communications,U.R.CIRTACOM,Route de Raoued Km 3.5,2083 El Ghazala - Ariana – T Laboratoire PhLAM,CNRS UMR 8523,Université de Lille,59650 Villeneuve d’Ascq,France Ecole Nationale d’Ingénieurs de Tunis,Laboratoire SYSCOM,BP.37,Le Belvédère,1020,Tunisia. Institut TELECOM,TELECOM ParisTech,Ecole Nationale Supérieure des Télécommunications,46 Rue Barrault