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Proceedings Paper

Impact of the unipolar family codes on the performances of the DS-OCDMA system
Author(s): Amel Farhat; Mourad Menif; Catherine Lepers; Houria Rezig; Philippe Gallion
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Paper Abstract

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.

Paper Details

Date Published: 11 November 2008
PDF: 8 pages
Proc. SPIE 7136, Optical Transmission, Switching, and Subsystems VI, 71360Y (11 November 2008); doi: 10.1117/12.803476
Show Author Affiliations
Amel Farhat, Ecole Nationale d'Ingénieurs de Tunis, Lab. SYSCOM (Tunisia)
TELECOM ParisTech (France)
Mourad Menif, Ecole Supérieure des Communications. U.R. CIRTACOM (Tunisia)
Catherine Lepers, Lab. PhLAM, CNRS, Univ. de Lille (France)
Houria Rezig, Ecole Nationale d'Ingénieurs de Tunis, Lab. SYSCOM (Tunisia)
Philippe Gallion, TELECOM ParisTech (France)


Published in SPIE Proceedings Vol. 7136:
Optical Transmission, Switching, and Subsystems VI
Ken-ichi Kitayama; Pierpaolo C. Ghiggino; Kim Roberts; Yikai Su, Editor(s)

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