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Optical Engineering

Efficient phase-switch quadrature phase shift keying modulation scheme in radio over fiber system
Author(s): Xiao Li; Wei Ji; Zhaoyuan Kang; Xuwei Xue
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Paper Abstract

A phase-switch quadrature phase shift keying (PS-QPSK) modulation scheme is proposed for the radio-over-fiber (ROF) transmission system. In the downlink, the 60 GHz mm wave modulated by QPSK is generated by heterodyne detection. Systems implement compensation of chromatic dispersion with blind equalizations in the time domain and synchronization with the training sequence. The performance of the systems is evaluated in terms of constellation diagrams, bit error rate diagrams, and error vector magnitude. The effect of nonlinear crosstalk, in-phase/quadrature (IQ) mismatch of transmitter (Tx) and receiver (Rx) are taken into account in the performance evaluation. The PS-QPSK mechanism is analyzed comprehensively and systematically in an ROF system. In addition, the performance of the proposed system is compared to that of a traditional one adopting a phase-multiplexing quadrature phase shift keying (PM-QPSK) scheme. It reveals that the PS-QPSK-ROF system has a higher tolerance to nonlinear crosstalk and IQ mismatch than a PM-QPSK-ROF system.

Paper Details

Date Published: 15 May 2015
PDF: 7 pages
Opt. Eng. 54(5) 056103 doi: 10.1117/1.OE.54.5.056103
Published in: Optical Engineering Volume 54, Issue 5
Show Author Affiliations
Xiao Li, Shandong Univ. (China)
Wei Ji, Shandong Univ. (China)
Inspur Corp. (China)
Zhaoyuan Kang, Shandong Univ. (China)
Xuwei Xue, Shandong Univ. (China)


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