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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 26 — Dec. 12, 2011
  • pp: B429–B439

Experimental investigation and digital compensation of DGD for 112 Gb/s PDM-QPSK clock recovery

Darko Zibar, Julio Cesar R. F. de Olivera, Vittor Bedotti Ribeiro, Alberto Paradisi, Julio C. Diniz, Knud J. Larsen, and Idelfonso Tafur Monroy  »View Author Affiliations


Optics Express, Vol. 19, Issue 26, pp. B429-B439 (2011)
http://dx.doi.org/10.1364/OE.19.00B429


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Abstract

For asynchronous sampled systems such as Polarization Division Multiplexed Quadrature Phase Shift Keying, (PDM-QPSK), phase and frequency of the sampling clock is typically not synchronized to the data symbols. Therefore, timing adjustment, so called clock recovery and interpolation, must be performed in digital domain prior to signal demodulation in order to avoid cycle slips. For the first time, the impact of first order PMD, (DGD), is experimentally investigated and quantified for 112 Gb/s PDM-QPSK signal. We experimentally show that the combined effect of polarization mixing and first order PMD can significantly affect the performance of the timing error detector gain, even for moderate values leading to system outage. We propose and experimentally demonstrate a novel digital adaptive timing error detector is robust to polarization mixing and DGD. The proposed timing error detector algorithm combines the Gardner timing error detector algorithm with an adaptive structure based on gradient method.

© 2011 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications

ToC Category:
Subsystems for Optical Networks

History
Original Manuscript: September 28, 2011
Manuscript Accepted: October 10, 2011
Published: November 22, 2011

Virtual Issues
European Conference on Optical Communication 2011 (2011) Optics Express

Citation
Darko Zibar, Julio Cesar R. F. de Olivera, Vittor Bedotti Ribeiro, Alberto Paradisi, Julio C. Diniz, Knud J. Larsen, and Idelfonso Tafur Monroy, "Experimental investigation and digital compensation of DGD for 112 Gb/s PDM-QPSK clock recovery," Opt. Express 19, B429-B439 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-26-B429


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References

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