12 August 2008 Performance comparison of coherent versus incoherent direct sequence optical code division multiple access system
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Proceedings Volume 7099, Photonics North 2008; 70991N (2008) https://doi.org/10.1117/12.806880
Event: Photonics North 2008, 2008, Montréal, Canada
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.
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Amel Farhat, Amel Farhat, Mourad Menif, Mourad Menif, Catherine Lepers, Catherine Lepers, Houria Rezig, Houria Rezig, Philippe Gallion, Philippe Gallion, "Performance comparison of coherent versus incoherent direct sequence optical code division multiple access system", Proc. SPIE 7099, Photonics North 2008, 70991N (12 August 2008); doi: 10.1117/12.806880; https://doi.org/10.1117/12.806880
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