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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and V. Chan
  • Vol. 3, Iss. 5 — May. 1, 2011
  • pp: 435–446

Optical Code Division Multiple Access Network Transmission With M-ary Chip Symbols

Aminata A. Garba and Jan Bajcsy  »View Author Affiliations


Journal of Optical Communications and Networking, Vol. 3, Issue 5, pp. 435-446 (2011)
http://dx.doi.org/10.1364/JOCN.3.000435


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Abstract

This paper uses M-ary chip symbols to increase the spectral efficiency of optical code division multiple access (OCDMA) even though, when compared to its binary counterpart, M-ary OCDMA can have significantly increased multi-user interference (MUI). The presented numerical channel capacity results show that appropriate non-uniform M-ary signaling allows the reduction of MUI and the achievement of improved OCDMA spectral efficiency. Using insights from the OCDMA capacity results, we design a coded M-ary OCDMA transmission scheme that can achieve very high spectral efficiencies. The proposed time/wavelength OCDMA scheme relies on intensity modulation, appropriate non-uniform signaling, M-ary trellis-coded modulation and error-correcting codes. The corresponding receiver is based on direct detection of optical signals, soft-decision single-user demodulation and error-control decoding. The presented simulation results illustrate that the designed OCDMA scheme can support hundreds of active users at the target bit error rate of 10−9 and is robust to impairments encountered in optical transmission (shot noise, thermal noise). The achieved spectral efficiency of up to 1.34 bits per OCDMA chip is significantly better than the best binary OCDMA result reported in the literature.

© 2011 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4256) Fiber optics and optical communications : Networks, network optimization

ToC Category:
Research Papers

History
Original Manuscript: October 27, 2010
Revised Manuscript: January 28, 2011
Manuscript Accepted: February 9, 2011
Published: April 28, 2011

Citation
Aminata A. Garba and Jan Bajcsy, "Optical Code Division Multiple Access Network Transmission With M-ary Chip Symbols," J. Opt. Commun. Netw. 3, 435-446 (2011)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jocn-3-5-435

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