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


Alsowaidi, Naif Ahmed Ali and A. Eltaif, Tawfig Ahmad and Mokhtar, Mohd Ridzuan (2020) Performance analysis of a hybrid optical CDMA/DWDM system against inter-symbol interference and four wave mixing. Digital Communications and Networks. pp. 1-6. ISSN 2352-8648

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This paper reports the implementation and theoretical model for analyzing an optical CDMA/DWDM hybridsystem 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 isused in the proposed hybrid system to completely suppress the ISI. In this method, the sequence interval of thesignature code is squeezed into a duration of less than one-bit. The hybrid system is capable of accommodating120 optical CDMA users carried by only 10 DWDM wavelengths spaced by 0.2 nm with 60 Gb/s/wavelengthtransmitted over 105.075 km of opticalfiber. The result shows that the optimum interval of the code sequence is aquarter (i.e., 25%) of the bit duration. Moreover, the results reveal that the CDMA technology based on the spreadspectrum is capable of increasing the nonlinear tolerance of the proposed hybrid system as the energy of bits isdistributed over the chip sequence code. Also, the number of ones/weight and the positions between them have asignificant effect on the performance of the proposed hybrid system.

Item Type: Article
Uncontrolled Keywords: Code division multiple access, Optical CDMA, Dense wavelength division multiplexing, Four wave mixing, Inter-symbol interference
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering and Technology (FET)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 28 Dec 2020 15:41
Last Modified: 28 Dec 2020 15:41


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