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Related Experiment Videos

Source coherence impairments in a direct detection direct sequence optical code-division multiple-access system.

Ihsan Fsaifes1, Catherine Lepers, Mounia Lourdiane

  • 1Ecole Nationale Supérieure des Télécommuncations, Centre National de la Recherche Scientifique, Unité Mixte de Recherche, Paris. France. fsaifes@enst.fr

Applied Optics
|January 19, 2007
PubMed
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Direct sequence optical code-division multiple-access (DS-OCDMA) systems using sampled fiber Bragg gratings (S-FBGs) can experience interference due to multiple reflections. Analyzing new codes can reduce laser source sensitivity in these OCDMA systems.

Area of Science:

  • Optoelectronics
  • Optical Communications
  • Signal Processing

Background:

  • Direct sequence optical code-division multiple-access (DS-OCDMA) systems are crucial for high-capacity optical networks.
  • Sampled fiber Bragg gratings (S-FBGs) are used in DS-OCDMA encoders and decoders.
  • The coherence time of laser sources can impact system performance.

Purpose of the Study:

  • To investigate the interferometric behavior of S-FBGs in DS-OCDMA systems.
  • To analyze the impact of laser source coherence time on autocorrelation functions.
  • To explore novel coding schemes for enhanced DS-OCDMA performance.

Main Methods:

  • Modeling S-FBG-based encoders/decoders as multipath interferometers.
  • Analyzing autocorrelation functions considering complex amplitude summation.

Related Experiment Videos

  • Evaluating sparse and nonperiodic quadratic congruence and extended quadratic congruence codes.

    • Main Results:

    • S-FBGs exhibit multipath interferometric behavior in DS-OCDMA.
    • Multiple reflections can superimpose within a chip duration, affecting chip pulses.
    • Autocorrelation functions must account for complex amplitude summation under long coherence times.

    Conclusions:

    • The coherence time of the laser source significantly affects DS-OCDMA systems utilizing S-FBGs.
    • Sparse and nonperiodic quadratic congruence codes offer a potential solution to mitigate sensitivity.
    • Further research into advanced coding is needed for robust DS-OCDMA performance.