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Journal of Optical Communications

Security Performance of Spectral Amplitude Code OCDMA: Spectrally Encoded Pulse Bandwidth Effects

Hesham A. Bakarman, Sahbudin B. Shaari, Mahamod B. Ismail

Published Jan 1, 2009• 7 citations
Publisher

Abstract

This paper presents security performance of spectral amplitude code OCDMA based on Modified Double Weight (MDW) OCDMA scheme. The eavesdropper probability of correctly detected Spectral Encoding Chip Bandwidth (SECB) pulses in a code word is investigated. For MDW code with code length and code weight of 9 and 4 respectively, SNR of approximately 8 dB is sufficient for an eavesdropper to detect the SECB pulses with a probability of 50%. The eavesdropper performance is based on tapping and observing the encoded transmitted signal using a tuning band pass filter followed by envelope detector. The eavesdropper measures the intensity for each intercepted pulse and calculates its corresponding sig- nal to noise ratio (SNR). Spectral Encoding Chip Bandwidth effect is investigated by simulation. The possibility of eavesdropping increases with wide SECB. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar ones.

DOI
10.1515/joc.2009.30.4.242

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This paper presents security performance of spectral amplitude code OCDMA based on Modified Double Weight (MDW) OCDMA scheme. The eavesdropper probability of correctly detected Spectral Encoding Chip Bandwidth (SECB) pulses in a code word is investigated. For MDW code with code length and code weight of 9 and 4 respectively, SNR of approximately 8 dB is sufficient for an eavesdropper to detect the SECB pulses with a probability of 50%. The eavesdropper performance is based on tapping and observing the encoded transmitted signal using a tuning band pass filter followed by envelope detector. The eavesdropper measures the intensity for each intercepted pulse and calculates its corresponding sig- nal to noise ratio (SNR). Spectral Encoding Chip Bandwidth effect is investigated by simulation. The possibility of eavesdropping increases with wide SECB. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar ones.
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This paper presents the eavesdropper performance to tap and detect encoded spectral chips from optical CDMA networks. The probability of correctly detecting encoded spectral chip pulses is investigated based on Modified Double Weight (MDW) Spectral Amplitude Optical CDMA. For probability of correct detection of 0.5, an eavesdropper receiver would need to detect SNR of 8 dB. The eavesdropper performance is investigated by simulation. Tapping efficiency of 20% is enough to tap encoded spectral chips with reasonable sensitivity.
OCDMA) is an alternative method, which performs encoding and decoding through an optical signature code, in order to allow the selection of a desired signal so that different users can share the same bandwidth.In such a systems, data signal overlap both in time and wavelength.Tradeoffs between security and performance in optical CDMA are presented.Confidentiality against eavesdropper interception strategies for optical CDMA is considered.Coherent detection and combining signals shows better confidentiality than the incoherent one.Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated.Increasing the network system capacity or maximizing authorized specified SNRs will lead to eavesdropper to detect high SNRs.
(OCDMA) is an alternative method, which performs encoding and decoding through an optical signature code, in order to allow the selection of the desired signal so that different users can share the same bandwidth. In such a system, the data signal overlap both in time and wavelength. Tradeoffs between security and performance in optical CDMA are presented. Confidentiality against eavesdropper interception strategies for optical CDMA is considered. Coherent detection and combining signals shows better confidentiality than the incoherent one. Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated. Increasing the network system capacity or maximizing authorized specified SNRs will lead to eavesdropper to detect high SNRs.
In this paper, tradeoffs between security and performance in optical CDMA is presented. Confidentiality against eavesdropper interception strategies for optical CDMA is considered. Coherent detection and combining signals shows better confidentiality than the incoherent one. Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated. Increasing the network system capacity or maximizing authorized specified SNRs will lead the eavesdropper to detect high SNRs.