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Related Experiment Videos

Photonic encoder and decoder for optical code-division multiplexing with time-to-space converters and

Hiroyuki Tsuda1, Hirokazu Takenouchi

  • 1Keio University, Yokohama, Kanagawa, Japan. tsuda@elec.keio.ac.jp

Applied Optics
|March 20, 2002
PubMed
Summary

A novel photonic encoder-decoder system enhances optical code-division multiplexing (OCDM) using time-to-space converters and holograms. This technology achieves a spectral efficiency of 0.17 (bits/s)/Hz for 8-channel systems.

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Area of Science:

  • Photonics
  • Optical Communications
  • Information Technology

Background:

  • Optical Code-Division Multiplexing (OCDM) systems enable multiple users to share the same optical channel simultaneously.
  • Efficient encoder-decoder mechanisms are crucial for high-performance OCDM networks.
  • Existing methods face challenges in scalability and spectral efficiency.

Purpose of the Study:

  • To propose and evaluate a novel photonic encoder-decoder pair for OCDM systems.
  • To utilize time-to-space converters and angle-multiplexed holograms for signal encoding and decoding.
  • To assess the performance and spectral efficiency of the proposed OCDM system.

Main Methods:

  • Development of a photonic encoder utilizing time-to-space conversion to generate unique codes for each input signal.

Related Experiment Videos

  • Implementation of angle-multiplexed holograms in the decoder to perform correlation between transmitted and recorded codes.
  • Performance estimation of the OCDM system, focusing on bit-error rate and spectral efficiency.

    • Main Results:

    • The proposed encoder-decoder pair successfully multiplexes input signals and generates correlation waveforms.
    • The system demonstrates a maximum spectral efficiency of 0.17 (bits/s)/Hz for an 8-channel system using 8-bit orthogonal codes.
    • The performance was evaluated at a bit-error rate of 10(-9) in the worst-case scenario.

    Conclusions:

    • The developed photonic encoder-decoder pair is a viable solution for enhancing OCDM systems.
    • The use of time-to-space converters and holograms offers a promising approach for efficient optical signal processing in OCDM.
    • The achieved spectral efficiency indicates the potential of this technology for future high-capacity optical networks.