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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 3 — Feb. 2, 2009
  • pp: 1435–1441

Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver

Yojiro Mori, Chao Zhang, Koji Igarashi, Kazuhiro Katoh, and Kazuro Kikuchi  »View Author Affiliations


Optics Express, Vol. 17, Issue 3, pp. 1435-1441 (2009)
http://dx.doi.org/10.1364/OE.17.001435


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Abstract

We demonstrate unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using a digital coherent receiver, where the decision-directed carrier-phase estimation is employed. The phase fluctuation is effectively eliminated in the 16-QAM system with such a phase-estimation method, when the linewidth of semiconductor lasers for the transmitter and the local oscillator is 150 kHz. Finite-impulse-response (FIR) filters at the receiver compensate for 4,000-ps/nm group-velocity dispersion (GVD) of the 200-km-long single-mode fiber and a part of self-phase modulation (SPM) in the digital domain. In spite of the launched power limitation due to SPM, the acceptable bit-error rate performance is obtained owing to high sensitivity of the digital coherent receiver.

© 2009 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2920) Fiber optics and optical communications : Homodyning
(060.4080) Fiber optics and optical communications : Modulation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: November 20, 2008
Revised Manuscript: December 15, 2008
Manuscript Accepted: January 14, 2009
Published: January 23, 2009

Citation
Yojiro Mori, Chao Zhang, Koji Igarashi, Kazuhiro Katoh, and Kazuro Kikuchi, "Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver," Opt. Express 17, 1435-1441 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-3-1435


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References

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