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Optical Engineering

Investigation of in-band transmission of both spectral amplitude coding/optical code division multiple-access and wavelength division multiplexing signals
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Paper Abstract

The transmission of both optical code division multiple-access (OCDMA) and wavelength division multiplexing (WDM) users on the same band is investigated. Code pulses of spectral amplitude coding (SAC)/optical code division multiple-access (CDMA) are overlaid onto a multichannel WDM system. Notch filters are utilized in order to suppress the WDM interference signals for detection of optical broadband CDMA signals. Modified quadratic congruence (MQC) codes are used as the signature codes for the SAC/OCDMA system. The proposed system is simulated and its performance in terms of both the bit-error rate and Q-factor are determined. In addition, eavesdropper probability of error-free code detection is evaluated. Our results are compared to traditional nonhybrid systems. It is concluded that the proposed hybrid scheme still achieves acceptable performance. In addition, it provides enhanced data confidentiality as compared to the scheme with SAC/OCDMA only. It is also shown that the performance of the proposed system is limited by the interference of the WDM signals. Furthermore, the simulation illustrates the tradeoff between the performance and confidentiality for authorized users.

Paper Details

Date Published: 1 June 2011
PDF: 8 pages
Opt. Eng. 50(6) 065001 doi: 10.1117/1.3589296
Published in: Optical Engineering Volume 50, Issue 6
Show Author Affiliations
Isaac A. M. Ashour, Univ. Kebangsaan Malaysia (Malaysia)
Sahbudin Bin Haji Shaari, Univ. Kebangsaan Malaysia (Malaysia)
P. Susthitha Menon, Univ. Kebangsaan Malaysia (Malaysia)
Hossam M. H. Shalaby, Alexandria Univ. (Egypt)


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