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Journal of Optical Communications

Performance Analysis of Optical-CDMA System with Novel Frequency Hopping Code Scheme based on EPC

Yiran Gao, Yubao Wang, Chao Zuo, Wenhua Ma, Jian Wu, Jintong Lin

Published Jan 1, 2005• 0 citations
Publisher

Abstract

A novel optical-CDMA communication system in which the frequency-hopping sequence is based on the EPC was proposed. Fiber Bragg grating array (FBGA) is employed as the encoder and decoder in this system. The code length is shorter with this code scheme hence higher bit rate can be obtained. The numerical result shows that good performance can be obtained by adding double optical hard-limiters.

DOI
10.1515/joc.2005.26.6.260

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A novel optical-CDMA communication system in which the frequency-hopping sequence is based on the EPC was proposed. Fiber Bragg grating array (FBGA) is employed as the encoder and decoder in this system. The code length is shorter with this code scheme hence higher bit rate can be obtained. The numerical result shows that good performance can be obtained by adding double optical hard-limiters.
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It has been proposed that the arrived photon count obeys negative binomial (NB) distribution when a thermal optical source is used. In this letter, we have analyzed the bit-error rate (BER) of an optical spectral-amplitude-coding CDMA system using NB distribution. It has been shown that when the number of simultaneous users is small, the resultant BER is much lower than that calculated using Gaussian approximation. When the number of simultaneous users is large (for example N>19 when the effective power is -27 dBm), both NE distribution and Gaussian approximation give almost the same value for the BER of the system.
Optical code division multiple access (OCDMA) systems are generally interference limited. To alleviate the adverse effect of optical multiple access interference (OMAI), use of forward error correcting (FEC) codes and optical double hard-limiters (DHLs) are explored. The system analysis is carried out under chip synchronous case among different users with PIN+OA as the receiver. The analysis incorporates the effect of amplifier noise, thermal noise and OMAI. It is observed that optical CDMA systems with FEC and double hard-limiters give rise to satisfactory performance even when the number of simultaneous users is large. It has been observed that with the usage of DHLs there is a significant improvement in the performance. When FEC is also used along with DHLs, there is slight enhancement in the performance.
This paper presents the security enhancement for spectral amplitude coding optical CDMA. The eavesdropper probability of error-free code detection based on hybrid code system is investigated. Enhancement Double Weight (EDW) optical CDMA scheme and M-sequence codes are used as a hybrid code system. The eavesdropper performance is based on observing the authorized transmitted signal based on classical detection theory. The eavesdropper taps a coded transmission of a particular user and performs the necessary calculations to derive the transmitter's code word from these transmissions. If an eavesdropper could be forced to tap code pulses with low SNRs, a security enhancement can be obtained. An eavesdropper would need SNR of 9.2 dB to correctly detect encoded pulses with a probability of 50 % for the hybrid scheme, which is 5 and 3 dB higher than M-sequence and EDW schemes respectively. The difference in performance of the eavesdropper's receiver with envelope detection is getting small, especially at higher SNRs.