Blind Equalization and Carrier Phase Recovery in a 16-QAM Optical Coherent System
Top Cited Papers
- 5 May 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 27 (15) , 3042-3049
- https://doi.org/10.1109/jlt.2009.2021961
Abstract
Blind equalization and carrier phase recovery in a simulated 14 Gbaud 16-QAM optical coherent system are investigated. Equalization techniques to compensate for linear transmission impairments are presented using the constant modulus algorithm (CMA), the recursive least-squares (RLS)-CMA, and the radius directed equalization (RDE). With 7 T/2-spaced taps, the RDE and the RLS-CMA can compensate up to 1000 ps/nm of CD in the 16-QAM coherent system with performances comparable to the decision-directed (DD) equalizer. We show that the RDE is a promising technique for blind equalization in a 16-QAM coherent system with lower complexity than the RLS-CMA. Blind carrier phase recovery is investigated in a decision-directed-mode. We show that the blind carrier phase recovery algorithm can recover the Square-16-QAM constellation for laser beat linewidths of DeltanuTs ~ 10-4 in a polarization-multiplexed (POLMUX) 16-QAM coherent system with the RDE algorithm giving better overall performance than the CMA when compensating for CD and differential group delay (DGD). Finally, the dynamical characteristics of the equalizers to track endless polarization rotations are discussed. With the adaptation parameters optimized, the equalizers can track angular rate of rotation ~ 105 rad/s.Keywords
This publication has 19 references indexed in Scilit:
- Laser Linewidth Limitations for Optical Systems with High-Order Modulation Employing Feed Forward Digital Carrier Phase EstimationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- 112-Gb/s polarization-multiplexed 16-QAM on a 25-GHz WDM gridPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- Feedforward Carrier Recovery for Coherent Optical CommunicationsJournal of Lightwave Technology, 2007
- Intersymbol Interference (ISI) Suppression Technique for Optical Binary and Multilevel Signal GenerationJournal of Lightwave Technology, 2007
- Performance of coherent optical square-16-QAM-systems based on IQ-transmitters and homodyne receivers with digital phase estimationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Recursive Least Squares Constant Modulus Algorithm for Blind Adaptive ArrayIEEE Transactions on Signal Processing, 2004
- Blind Equalization and Carrier Recovery Using a "Stop-and-Go" Decision-Directed AlgorithmIEEE Transactions on Communications, 1987
- Convergence analysis of self-adaptive equalizersIEEE Transactions on Information Theory, 1984
- A new approach to multipath correction of constant modulus signalsIEEE Transactions on Acoustics, Speech, and Signal Processing, 1983
- Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication SystemsIEEE Transactions on Communications, 1980