Volume 12 Issue 1
Feb.  2019
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Naif Alsowaidi, Tawfig Eltaif, Mohd Ridzuan Mokhtar. Suppression of inter and intra channel four wave mixing effects in optical CDMA over DWDM hybrid system[J]. Chinese Optics, 2019, 12(1): 156-166. doi: 10.3788/CO.20191201.0156
Citation: Naif Alsowaidi, Tawfig Eltaif, Mohd Ridzuan Mokhtar. Suppression of inter and intra channel four wave mixing effects in optical CDMA over DWDM hybrid system[J]. Chinese Optics, 2019, 12(1): 156-166. doi: 10.3788/CO.20191201.0156

Suppression of inter and intra channel four wave mixing effects in optical CDMA over DWDM hybrid system

doi: 10.3788/CO.20191201.0156

Multimedia University(Malaysia), project SAP ID MMUI/160092

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  • Author Bio:

    Naif Alsowaidi was born in Yemen on December 30, 1987.He received the B.Eng.degree (with honors) in communication engineering from International Islamic University Malaysia (ⅡUM), in 2012 and the M.Sc.degree.in engineering science from Multimedia University (MMU), Malaysia, in 2015, currently he is a Ph.D.candidate at the Multimedia University.His current research interests include wireless communication, Optical CDMA systems, and nonlinear optics.E-mail:nas_201013@yahoo.com

    Tawfig Eltaif received his BSc degree in communication engineering from University of Tripoli, Libya, 2003, and MSc degree in microelectronics and PhD degree in micro-engineering & nanoelectronics from National University of Malaysia, Malaysia, 2005, 2009, respectively. He joined Photronix Technologies Company, 2008-2011, as a product and research engineer. Since 2012 he has been a senior lecturer at Multimedia University. His current research is focused on optical communication, optical frequency comb, FBG, and optical amplifiers

    Mohd Ridzuan Mokhtar received his PhD degree in optoelectronics from the University of Southampton, UK, in 2005. He is professor at the Faculty of Engineering, Multimedia University, Malaysia. He became a research fellow with City University London, UK, for a year in 2009, sponsored by the Technology Strategy Board in the UK. He has been the director of research and collaboration at Multimedia University since 2011. His main research interests include fiber optic sensors and optical communications

  • Corresponding author: Tawfig Eltaif, E-mail:tefosat@ieee.org
  • Received Date: 07 Mar 2018
  • Rev Recd Date: 25 Apr 2018
  • Publish Date: 01 Feb 2019
  • In this study, a hybrid system of optical Code Division Multiple Access(optical CDMA) and Dense Wavelength Division Multiplexing(DWDM) is proposed with a comprehensive investigation into the effect of four-wave mixing(FWM). In such system, two major FWM problems exist, inter and intra-channel FWM, including multiple access interference(MAI) and inter-symbol interference(ISI). Results show that the optimum transmitted power is 18dBm in order to control the trade-off between inter and intra-channel FWM, where an increase in the BER of the hybrid system at transmitted power above 18 dBm is indicated. Hence, an electro-optic phase modulator(EOPM) module is proposed and placed after the WDM multiplexer to simultaneously modulate the phase of all wavelengths signals to increase the nonlinear tolerance in the hybrid system by suppressing the impact of intra-channel FWM, which is shown to greatly improve the performance of the optical CDMA-DWDM hybrid system based OOK transmission. In addition, the effect of MAI can be reduced by the use of multi-diagonal(MD) identification sequence code, due to the zero cross-correlation property of MD. The results also reveal that the CDMA technology in conjunction with chromatic dispersion helps to reduce the effect of inter-channel FWM. Moreover, the identification sequence code interval plays crucial role in the mitigating of ISI as the results expose that the best performance of the proposed hybrid system can be achieved when the identification sequence code interval squeezed into 25% of bit duration where the avoidance of ISI is guaranteed.


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