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IEEE Photonics Technology Letters

Performance analysis of optical spectral-amplitude-coding CDMA systems using a super-fluorescent fiber source

Zou Wei, Hooshang Ghafouri‐Shiraz, Hossam M. H. Shalaby

Published Aug 1, 2001• 13 citations
Publisher

Abstract

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.

DOI
10.1109/68.935837

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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.
It has been proposed that arrived photon count at the photo-detector obeys negative binomial (NB) distribution when both the phase-induced intensity noise and Poisson-distributed photon arrival process are taken into account. In this paper, we analyze the performance of an optical spectral-amplitude-coding CDMA system based on this NB distribution. According to our knowledge, it is the first time that NB distribution is used in such kind of analysis. All previously published relevant papers have used Gaussian distribution in the calculation of bit error rates. We have also compared our analysis results with that from traditional Gaussian approximation. It has been shown that our analysis results are in good agreement with the Gaussion-approximated ones. When interference user number K=0, i.e. only the desired user is sending data, NB-distributionbased method gives a more precise performance estimation.
Fiber-optic code division multiple access (FO-CDMA) system configuration is introduced. The device losses of active fiber connector, optical encoder/decoder, star coupler, transmission media, power penalty induced by fiber dispersion and the chirp effect of laser source are analyzed. Theoretical analysis of system bit error rate (BER) is achieved. Numerical results show that, dispersion power penalty makes system BER decline. The chirp effect of laser source can compensate for the dispersion power penalty for short transmission distance. For a FO-CDMA system with 20 active users, optical orthogonal code with weight 4 is users' address codes, and the distance between transmitter and receiver is 30 km, if BER is 10 -9 , then the transmitted power requires 4.4 dBm for normal single mode fiber (SMF) and 0.7 dBm for dispersion shift fiber (DSF). The system total loss is 44.9 dB for normal SMF and 41.2 dB for DSF.
The performance of optical code-division multiple-access (CDMA) communication systems utilizing number-state light field is evaluated. Lossy direct-detection optical channels are assumed. Both on-off keying (OOK) and pulse-position modulation (PPM) schemes are investigated. For OOK, the exact bit error rate is evaluated taking into account the effect of both multiple-user interference and transmission loss. Upper and lower bounds on the bit error probability for PPM-CDMA systems are derived under the above considerations. The effect of both background and thermal noise is neglected in our analysis. Performance comparison between the number-state and coherent-state OOK/PPM-CDMA networks is also presented. Our results demonstrate that the number-state system requires less than half the energy consumed by the coherent-state one in order to attain the same performance. Lower bounds on the maximum number of simultaneous users are derived for both number- and coherent-state PPM-CDMA systems with asymptotically zero error rate.>
The performance of optical code-division multiple-access (CDMA) communication systems utilizing number-state light field is evaluated. Lossy direct detection optical channels are assumed. Both on-off keying (OOK) and pulse-position modulation (PPM) schemes are investigated. For OOK, the exact bit error rate is evaluated taking into account the effect of both multiple-user interference and transmission loss. Upper and lower bounds on the bit error probability for PPM-CDMA systems are derived under the above considerations. The effect of both background and thermal noise is neglected in the analysis. A comparison between the performance of the number- and coherent-state OOK/PPM-CDMA networks is also presented. The results demonstrate that the number-state system requires less than half the energy consumed by the coherent-state one in order to attain the same performance.>
The performance of coherent time-spreading (TS) and asynchronous TS phase coding optical code division multiple access (OCDMA) systems is investigated and analyzed. Particular consideration is given however to both beat noise (BN) and multiple-access interference (MAI) effects, and the impact of decision threshold on the bit-error-rate (BER) performance is evaluated. Improvement of the BER performance can be obtained by use of optimum threshold detection, and the improvement is more apparent in the asynchronous TS OCDMA scheme for a low number of simultaneous users with long code length.