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Electronically tunable silicon photonic delay lines.

Saeed Khan1, Mohammad Amin Baghban, Sasan Fathpour

  • 1Department of Electrical Engineering and Computer Science, University of Central Florida, Orlando, FL 32816, USA.

Optics Express
|July 1, 2011
PubMed
Summary

New silicon waveguide devices offer electronically tunable optical true-time delays using apodised gratings and the free-carrier plasma effect. These compact components achieve significant delay tuning ranges with low loss, enabling high-speed optical signal processing.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science (Silicon Photonics)

Background:

  • Optical true-time delay lines are crucial for advanced signal processing applications.
  • Existing tunable delay technologies often face limitations in tuning range, speed, or integration.
  • Silicon photonics offers a platform for compact and scalable optical devices.

Purpose of the Study:

  • To propose and investigate novel electronically tunable optical true-time delay lines.
  • To leverage apodised gratings and the free-carrier plasma effect for delay tuning in silicon waveguides.
  • To compare different configurations of the proposed tunable delay line.

Main Methods:

  • Design and simulation of silicon waveguide structures incorporating apodised gratings.
  • Utilizing the free-carrier plasma effect for electronic tuning of optical delay.

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  • Experimental characterization of three device variations in reflection mode.

    • Main Results:

    • Achieved significant electronic delay tuning ranges up to approximately 660 picoseconds (ps) with low insertion loss (< 2.2 dB) in reflection mode.
    • Demonstrated a delay of approximately 40 ps with a loss of < 10 dB at an estimated operating bit rate of ~20 Gb/s.
    • Compared three variations, highlighting performance trade-offs in tuning range and loss.

    Conclusions:

    • The proposed electronically tunable optical true-time delay lines based on silicon waveguides are effective.
    • The devices offer a promising solution for high-performance optical signal processing due to their compact size and tunability.
    • The demonstrated performance metrics suggest suitability for high-speed communication and radar systems.