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Recursive carrier phase tracking for synchronous multilevel 4QAM receivers

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3 Author(s)
Cusani, R. ; INFOCOM Dept., Rome Univ., Italy ; Baccarelli, E. ; Salonico, A.

Four-quadrature amplitude modulation (4QAM) allows high spectral efficiency in coherent optical data transmission by exploiting the two phases and the two polarizations of the propagating wave. In this paper the performance of 4QAM is analyzed in the presence of laser phase noise and photodetection noise. A decision feedback phase tracking scheme based on the Kalman filter and leading to a novel hybrid PLL structure is employed and its accuracy evaluated. The computational complexity of the proposed phase estimator is also discussed. The performance of the resulting 4QAM system is evaluated in terms of bit error probability versus the signal-to-noise ratio Eb/N0, for different ratios of the symbol rate Rs over the laser linewidth BL

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Lightwave Technology, Journal of  (Volume:13 ,  Issue: 8 )