Efficient phase-switch quadrature phase shift keying modulation scheme in radio over fiber system

Xiao Li; Wei Ji; Zhaoyuan Kang; Xuwei Xue

doi:10.1117/1.OE.54.5.056103

15 May 2015 Efficient phase-switch quadrature phase shift keying modulation scheme in radio over fiber system

Xiao Li, Wei Ji, Zhaoyuan Kang, Xuwei Xue

Author Affiliations +

Optical Engineering, Vol. 54, Issue 5, 056103 (May 2015). https://doi.org/10.1117/1.OE.54.5.056103

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.

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Xiao Li, Wei Ji, Zhaoyuan Kang, and Xuwei Xue "Efficient phase-switch quadrature phase shift keying modulation scheme in radio over fiber system," Optical Engineering 54(5), 056103 (15 May 2015). https://doi.org/10.1117/1.OE.54.5.056103

Published: 15 May 2015

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