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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 7 — Apr. 4, 2005
  • pp: 2761–2766

Noise statistics of and BER estimation using demodulated signals for direct detection differential polarization-phase-shift keying

Yan Han and Guifang Li  »View Author Affiliations


Optics Express, Vol. 13, Issue 7, pp. 2761-2766 (2005)
http://dx.doi.org/10.1364/OPEX.13.002761


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Abstract

The noise statistics of optically demodulated signal of the recently proposed modulation format, namely differential polarization-phase-shift keying, are analyzed. It is found that, in the linear regime, the Gaussian approximation is reasonably accurate in estimating the BER. In the nonlinear regime, the noise of the demodulated signal is dominated by the effect of nonlinear phase noise and obeys chi-squared statistics with a degree of freedom of one. Gaussian approximation underestimates the BER in the nonlinear regime. A two-step BER estimation method accounting for both linear beat noise and nonlinear phase noise is proposed. The effectiveness of this two-step BER estimation method at all power levels has been established by comparison with direct error counting.

© 2005 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(260.5430) Physical optics : Polarization

ToC Category:
Research Papers

History
Original Manuscript: February 24, 2005
Revised Manuscript: March 26, 2005
Published: April 4, 2005

Citation
Yan Han and Guifang Li, "Noise statistics of and BER estimation using demodulated signals for direct detection differential polarization-phase-shift keying," Opt. Express 13, 2761-2766 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-7-2761


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References

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