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A compact nonlinear fiber-based optical autocorrelation peak discriminator.

M P Fok1, Y Deng, P R Prucnal

  • 1Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA. mfok@princeton.edu

Optics Express
|June 10, 2009
PubMed
Summary

This study introduces a novel fiber-optic device that enhances optical code-division multiple-access (CDMA) signal detection by effectively distinguishing autocorrelation peaks. The compact nonlinear fiber discriminator improves receiver sensitivity and eliminates errors, even with strong interfering signals.

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Area of Science:

  • Photonics
  • Optical Communications
  • Nonlinear Optics

Background:

  • Optical Code-Division Multiple-Access (CDMA) systems require robust signal detection methods.
  • Cross-correlation peaks can interfere with the detection of the desired autocorrelation peak in optical CDMA.
  • Existing methods for distinguishing these peaks may be complex or bulky.

Purpose of the Study:

  • To experimentally demonstrate a compact and passive optical autocorrelation peak discriminator.
  • To improve the detection of optical CDMA signals by effectively rejecting cross-correlation peaks.
  • To assess the performance of the discriminator under various signal conditions.

Main Methods:

  • Utilizing four-wave mixing in a short, highly nonlinear bismuth-oxide fiber.

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  • Implementing a nonlinear fiber-based optical autocorrelation peak discriminator.
  • Measuring eye diagrams and bit-error rates at different optical power ratios.

    • Main Results:

    • The developed discriminator successfully rejects cross-correlation peaks.
    • Significant improvements in receiver sensitivity were achieved.
    • Error floors were effectively removed, demonstrating robust performance.
    • The device functions effectively even when cross-correlation peaks exceed the autocorrelation peak amplitude.

    Conclusions:

    • The nonlinear fiber-based optical autocorrelation peak discriminator offers a passive and compact solution for enhancing optical CDMA signal detection.
    • This technology significantly improves receiver performance by mitigating interference from cross-correlation peaks.
    • The demonstrated approach shows promise for practical implementation in advanced optical communication systems.