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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 20 — Oct. 1, 2007
  • pp: 13114–13122

Simple nonlinear interferometer-based all-optical thresholder and its applications for optical CDMA

Konstantin Kravtsov, Paul R. Prucnal, and Mikhail M. Bubnov  »View Author Affiliations

Optics Express, Vol. 15, Issue 20, pp. 13114-13122 (2007)

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We present an experimental demonstration of an ultrafast all-optical thresholder based on a nonlinear Sagnac interferometer. The proposed design is intended for operation at very small nonlinear phase shifts. Therefore, it requires an in-loop nonlinearity lower than for the classical nonlinear loop mirror scheme. Only 15 meters of conventional (non-holey) silica-based fiber is used as a nonlinear element. The proposed thresholder is polarization insensitive and is good for multi-wavelength operation, meeting all the requirements for autocorrelation detection in various optical CDMA communication systems. The observed cubic transfer function is superior to the quadratic transfer function of second harmonic generation-based thresholders.

© 2007 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: July 2, 2007
Revised Manuscript: September 17, 2007
Manuscript Accepted: September 20, 2007
Published: September 26, 2007

Konstantin Kravtsov, Paul R. Prucnal, and Mikhail M. Bubnov, "Simple nonlinear interferometer-based all-optical thresholder and its applications for optical CDMA," Opt. Express 15, 13114-13122 (2007)

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