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Sensors 2016, 16(9), 1440; doi:10.3390/s16091440

A Study of Dispersion Compensation of Polarization Multiplexing-Based OFDM-OCDMA for Radio-over-Fiber Transmissions

Department of Electrical Engineering, National Formosa University, Yunlin County 632, Taiwan
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Author to whom correspondence should be addressed.
Academic Editors: Teen-Hang Meen, Shoou-Jinn Chang, Stephen D. Prior and Artde Donald Kin-Tak Lam
Received: 7 July 2016 / Revised: 21 August 2016 / Accepted: 29 August 2016 / Published: 7 September 2016
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Abstract

Chromatic dispersion from optical fiber is the most important problem that produces temporal skews and destroys the rectangular structure of code patterns in the spectra-amplitude-coding-based optical code-division multiple-access (SAC-OCDMA) system. Thus, the balance detection scheme does not work perfectly to cancel multiple access interference (MAI) and the system performance will be degraded. Orthogonal frequency-division multiplexing (OFDM) is the fastest developing technology in the academic and industrial fields of wireless transmission. In this study, the radio-over-fiber system is realized by integrating OFDM and OCDMA via polarization multiplexing scheme. The electronic dispersion compensation (EDC) equalizer element of OFDM integrated with the dispersion compensation fiber (DCF) is used in the proposed radio-over-fiber (RoF) system, which can efficiently suppress the chromatic dispersion influence in long-haul transmitted distance. A set of length differences for 10 km-long single-mode fiber (SMF) and 4 km-long DCF is to verify the compensation scheme by relative equalizer algorithms and constellation diagrams. In the simulation result, the proposed dispersion mechanism successfully compensates the dispersion from SMF and the system performance with dispersion equalizer is highly improved. View Full-Text
Keywords: spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA); orthogonal frequency-division multiplexing (OFDM); balanced photo-detector (BPD); multiple access interference (MAI); dispersion equalize spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA); orthogonal frequency-division multiplexing (OFDM); balanced photo-detector (BPD); multiple access interference (MAI); dispersion equalize
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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. (CC BY 4.0).

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Yen, C.-T.; Chen, W.-B. A Study of Dispersion Compensation of Polarization Multiplexing-Based OFDM-OCDMA for Radio-over-Fiber Transmissions. Sensors 2016, 16, 1440.

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