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Performance analysis of a hybrid optical CDMA/DWDM system against inter-symbol interference and four wave mixing


Al-sowaidi, N and Eltaif, T and Mokhtar, MR, Performance analysis of a hybrid optical CDMA/DWDM system against inter-symbol interference and four wave mixing, Digital Communications and Networks, 7, (1) pp. 151-156. ISSN 2468-5925 (2021) [Refereed Article]

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DOI: doi:10.1016/j.dcan.2020.05.002


This paper reports the implementation and theoretical model for analyzing an optical CDMA/DWDM hybrid system to reduce two major problems, the Inter-Symbol Interference (ISI) and the Four-Wave Mixing (FWM) effects and improve the performance of optical subscriber access networks by using Zero Cross-Correlation (ZCC) optical codes, which helps to reduce the effect of the Multiple Access Interference (MAI). A squeezing method is used in the proposed hybrid system to completely suppress the ISI. In this method, the sequence interval of the signature code is squeezed into a duration of less than one-bit. The hybrid system is capable of accommodating 120 optical CDMA users carried by only 10 DWDM wavelengths spaced by 0.2 ​nm with 60 ​Gb/s/wavelength transmitted over 105.075 ​km of optical fiber. The result shows that the optimum interval of the code sequence is a quarter (i.e., 25%) of the bit duration. Moreover, the results reveal that the CDMA technology based on the spread spectrum is capable of increasing the nonlinear tolerance of the proposed hybrid system as the energy of bits is distributed over the chip sequence code. Also, the number of ones/weight and the positions between them have a significant effect on the performance of the proposed hybrid system.

Item Details

Item Type:Refereed Article
Research Division:Engineering
Research Group:Communications engineering
Research Field:Communications engineering not elsewhere classified
Objective Division:Manufacturing
Objective Group:Computer, electronic and communication equipment
Objective Field:Computer, electronic and communication equipment not elsewhere classified
UTAS Author:Al-sowaidi, N (Dr Naif Al-sowaidi)
ID Code:151907
Year Published:2021
Web of Science® Times Cited:1
Deposited By:Information and Communication Technology
Deposited On:2022-08-08
Last Modified:2022-08-10

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