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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 17 — Aug. 16, 2010
  • pp: 17756–17763

Optical periodic code matching by single-shot broadband frequency-domain cross-correlation

Lev Chuntonov and Zohar Amitay  »View Author Affiliations

Optics Express, Vol. 18, Issue 17, pp. 17756-17763 (2010)

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We introduce and experimentally demonstrate a simple and reliable optical technique for matching between two periodic numerical sequences based on optical single-shot measurement of their broadband cross-correlation function in the frequency domain. Each sequence is optically encoded into the shape of the different broadband femtosecond pulse using pulse-shaping techniques. The two corresponding shaped pulses are mixed in a nonlinear medium together with an additional (amplitude-shaped) narrowband pulse. The spectrum of the resulting four-wave mixing signal is measured to provide the cross-correlation function of the two encoded sequences. For identical sequences it is the auto-correlation function that is being measured, allowing also the identification of the sequence period. The high contrast achieved here between cross-correlation and auto-correlation functions allows to determine with a very high reliability whether the two encoded sequences are identical or not. The demonstrated technique might be employed in an optical implementation of CDMA communication protocol.

© 2010 OSA

OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(200.3050) Optics in computing : Information processing
(060.4251) Fiber optics and optical communications : Networks, assignment and routing algorithms

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 24, 2010
Revised Manuscript: July 9, 2010
Manuscript Accepted: July 12, 2010
Published: August 3, 2010

Lev Chuntonov and Zohar Amitay, "Optical periodic code matching by single-shot broadband frequency-domain cross-correlation," Opt. Express 18, 17756-17763 (2010)

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