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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 33, Iss. 23 — Dec. 1, 2008
  • pp: 2845–2847

Delay-asymmetric nonlinear loop mirror for DPSK demodulation

Mable P. Fok and Chester Shu  »View Author Affiliations


Optics Letters, Vol. 33, Issue 23, pp. 2845-2847 (2008)
http://dx.doi.org/10.1364/OL.33.002845


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Abstract

We demonstrate the use of a delay-asymmetric nonlinear loop mirror (DANLM) for tunable differential phase shift keying (DPSK) demodulation. The DANLM introduces tunable differential delay between two counterpropagating signals while maintaining their phase information. The device is demonstrated using degenerate four-wave mixing wavelength-conversion and wavelength-dependent group delay. The DANLM can support the demodulation of DPSK signals over a wide range of continuously tunable bit rates and delays. We experimentally achieve the demodulation of return-to-zero DPSK signals at 10 and 20 Gbits s using the same DANLM. Demodulation of nonreturn-to-zero DPSK signal at 10 Gbits s with one-, half-, and quarter-bit delays has also been demonstrated. Widely opened eye diagrams and error-free detection have been obtained.

© 2008 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4510) Fiber optics and optical communications : Optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: January 7, 2008
Revised Manuscript: September 19, 2008
Manuscript Accepted: October 8, 2008
Published: November 25, 2008

Citation
Mable P. Fok and Chester Shu, "Delay-asymmetric nonlinear loop mirror for DPSK demodulation," Opt. Lett. 33, 2845-2847 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-23-2845


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