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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26236–26251

Novel configuration of finite-impulse-response filters tolerant to carrier-phase fluctuations in digital coherent optical receivers for higher-order quadrature amplitude modulation signals

Yojiro Mori, Chao Zhang, and Kazuro Kikuchi  »View Author Affiliations


Optics Express, Vol. 20, Issue 24, pp. 26236-26251 (2012)
http://dx.doi.org/10.1364/OE.20.026236


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Abstract

We propose a novel configuration of the finite-impulse-response (FIR) filter adapted by the phase-dependent decision-directed least-mean-square (DD-LMS) algorithm in digital coherent optical receivers. Since fast carrier-phase fluctuations are removed from the error signal which updates tap coefficients of the FIR filter, we can achieve stable adaptation of filter-tap coefficients for higher-order quadrature-amplitude modulation (QAM) signals. Computer simulations show that our proposed scheme is much more tolerant to the phase noise and the frequency offset than the conventional DD-LMS scheme. Such theoretical predictions are also validated experimentally by using a 10-Gsymbol/s dual-polarization 16-QAM signal.

© 2012 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 13, 2012
Revised Manuscript: October 25, 2012
Manuscript Accepted: October 25, 2012
Published: November 6, 2012

Citation
Yojiro Mori, Chao Zhang, and Kazuro Kikuchi, "Novel configuration of finite-impulse-response filters tolerant to carrier-phase fluctuations in digital coherent optical receivers for higher-order quadrature amplitude modulation signals," Opt. Express 20, 26236-26251 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26236


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References

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