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Proceedings Paper

Performance comparison of coherent versus incoherent direct sequence optical code division multiple access system
Author(s): Amel Farhat; Mourad Menif; Catherine Lepers; Houria Rezig; Philippe Gallion
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Paper Abstract

In this paper, we compare the performances of a coherent versus incoherent Direct Sequence Optical Code Division Multiple Access (DS-OCDMA) system. Superstructured Fiber Bragg Grating (S-FBG) encoders/decoders are used to implement unipolar codes such as Prime Sequence (PS) and Extended Quadratic Codes (EQC) codes. We implement the Importance Sampling (IS) technique, which is a variant of the well-known Monte-Carlo (MC) method, to evaluate the Bit Error Rate (BER) performances of the system. Our simulation results depict that coherent system outperforms the incoherent one. The last system can be used but a BER floor is demonstrated due to the beat noise of the incoherent source. We show that increasing bit rate leads to a deterioration of the BER behavior and requiring an increase of the optical bandwidth of the signal.

Paper Details

Date Published: 12 August 2008
PDF: 9 pages
Proc. SPIE 7099, Photonics North 2008, 70991N (12 August 2008); doi: 10.1117/12.806880
Show Author Affiliations
Amel Farhat, Ecole Nationale d'Ingénieurs de Tunis (Tunisia)
Ecole Nationale Supérieure des Télécommunications, TELECOM ParisTech, CNRS, LTCI (France)
Mourad Menif, Ecole Supérieure des Communications (Tunisia)
Catherine Lepers, Lab. PhLAM, CNRS, Univ. de Lille (France)
Houria Rezig, Ecole Nationale d'Ingénieurs de Tunis (Tunisia)
Philippe Gallion, Ecole Nationale Supérieure des Télécommunications, TELECOM ParisTech, CNRS, LTCI (France)


Published in SPIE Proceedings Vol. 7099:
Photonics North 2008

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