Analysis of Signal Processing Techniques for Optical 112 Gb/s DP-QPSK Receivers with Experimental Data

Thiago F. Portela, Diego V. Souto, Valery N. Rozental, Hugo B. Ferreira, Darli A. A. Mello, Helmut Griesser

Abstract


This paper evaluates several signal processing techniques for optical dual-polarization quadrature phase-shift keying (DP-QPSK) coherent receivers, using offline post-processing of experimental data. In addition to electronically separating the two polarization multiplexed signals, the investigated signal processing algorithms also compensate for chromatic dispersion (CD) and polarization mode dispersion (PMD). In particular, we investigate two distinct architectures: 1) Constant modulus algorithm (CMA) equalization followed by feedforward phase recovery. 2) Decision-directed least mean square (DD-LMS) equalization combined with decision-directed phase recovery. The interplay of both architectures with bulk dispersion compensators and carrier recovery algorithms is also analyzed.

Full Text:

PDF

References


Fatadin, S. Savory, and D. Ives, "Compensation of quadrature imbalance in an optical QPSK coherent receiver,`` Photonics Technology Letters, IEEE, vol. 20, no. 20, pp. 1733 –1735, oct.15, 2008.

S. J. Savory, "Digital filters for coherent optical receivers,`` Opt. Express, vol. 16, no. 2, pp. 804–817, 2008. [Online]. Available: http://www.opticsexpress.org/abstract.cfm?URI=oe-16-2-804

S. J. Savory, G. Gavioli, R. I. Killey, and P. Bayvel, "Electronic compensation of chromatic dispersion using a digital coherent receiver,`` Opt. Express, vol. 15, no. 5, pp. 2120–2126, 2007. [Online]. Available: http://www.opticsexpress.org/abstract.cfm?URI=oe-15-5-2120

S. Haykin, "Unsupervised adaptive filtering,`` vol. 2, no. 5, 2000.

J. Johnson, R., P. Schniter, T. Endres, J. Behm, D. Brown, and R. Casas, "Blind equalization using the constant modulus criterion: a review,`` Proceedings of the IEEE, vol. 86, no. 10, pp. 1927–1950, Oct 1998.

F. A. Garcia, D. A. Mello, and H. Waldman, "Feedforward carrier recovery for polarization demultiplexed signals with unequal signal to noise ratios,`` Opt. Express, vol. 17, no. 10, pp. 7958–7969, 2009. [Online]. Available: http://www.opticsexpress.org/abstract.cfm?URI=oe-17-10-7958

E. Ip, J. M. Kahn, "Feedforward carrier recovery for coherent optical communications,`` J. Lightwave Technol., vol. 25, pp. 2675–2692, 2007.

A. Vgenis, C. S. Petrou, C. B. Papadias, I. Roudas, and L. Raptis, "Nonsingular constant modulus equalizer for PDM-QPSK coherent optical receivers,`` Photonics Technology Letters, IEEE, vol. 22, pp. 45–47, 2010.




DOI: http://dx.doi.org/10.1590/S2179-10742011000100016

Refbacks

  • There are currently no refbacks.


© Copyright 2007-2016 JMOe Brazilian Microwave and Optoelectronics Society (SBMO) and Brazilian Society of Electromagnetism (SBMag)