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Mathematical Problems in Engineering
Volume 2013, Article ID 901871, 6 pages
Research Article

Performance Enhancement of Optical CDMA by Differential-Phase Method for Radio-over-Fiber Transmissions

1Department of Electro-Optical Engineering, National Formosa University, Yunlin County 632, Taiwan
2Department of Electrical Engineering, National Formosa University, Yunlin County 632, Taiwan

Received 8 September 2013; Accepted 7 October 2013

Academic Editor: Teen-Hang Meen

Copyright © 2013 Hsu-Chih Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The study proposes the differential-phase optical code-division multiple-access (OCDMA) network for radio-over-fiber (RoF) transmissions, and the characteristics are numerically analyzed. The network coder/decoders (codecs) are structured on the basis of arrayed-waveguide-grating (AWG) routers with complementary Walsh-Hadamard (CWH) signature codes. In the proposed system, the network requires only two AWG routers to accomplish spectral encoding of radio base station (RBS) and decoding of control station for the complementary keying, thus resulting in a simpler and low cost system. Performance analyses are evaluated with the dominant noise of phase-induced intensity noise (PIIN) in spectral code OCDMA network. By the proposed AWG-based OCDMA with the differential-phase scheme, it is possible to establish interference-free and low crosstalk beat noise RoF systems.