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Quasi-light Storage for Optical Data Packets
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Published on: February 6, 2014

Enhancing light slow-down in semiconductor optical amplifiers by optical filtering.

Weiqi Xue1, Yaohui Chen, Filip Ohman

  • 1Department of Photonics Engineering, Technical University of Denmark, Building 343, DK-2800 Kongens Lyngby, Denmark. xue@com.dtu.dk

Optics Letters
|May 17, 2008
PubMed
Summary

Optical filtering significantly enhances light-speed control in semiconductor optical amplifiers. This method achieves a large phase shift and increased bandwidth, improving device performance for advanced applications.

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Area of Science:

  • Optoelectronics
  • Semiconductor physics
  • Photonics

Background:

  • Semiconductor optical amplifiers (SOAs) are crucial for optical signal processing.
  • Controlling the speed of light within SOAs is essential for high-speed communication systems.
  • Existing methods for light-speed control in SOAs have limitations in phase shift and bandwidth.

Purpose of the Study:

  • To investigate the impact of optical filtering on light-speed control in semiconductor optical amplifiers.
  • To enhance the achievable phase shift and bandwidth for improved SOA performance.
  • To provide a physical explanation for the observed effects.

Main Methods:

  • Introduction of optical filtering into the semiconductor optical amplifier.
  • Modulation frequency analysis at 19 GHz.
  • Numerical simulations incorporating population oscillations and four-wave mixing.
  • Analytical perturbation approach for physical explanation.

Main Results:

  • Significant extension of light-speed control demonstrated through optical filtering.
  • Achieved a phase shift of approximately 150 degrees at 19 GHz modulation frequency.
  • Observed a several-fold increase in absolute phase shift and achievable bandwidth.
  • Good quantitative agreement between experimental results and numerical simulations.

Conclusions:

  • Optical filtering is an effective technique to enhance light-speed control in semiconductor optical amplifiers.
  • The enhanced phase shift and bandwidth offer significant improvements for optical signal processing.
  • The study provides a validated physical model for understanding and optimizing SOA performance.