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Continuously tunable delay line based on SOI tapered Bragg gratings.

Ivano Giuntoni1, David Stolarek, Dimitar I Kroushkov

  • 1Technische Universität Berlin, Fachgebiet Hochfrequenztechnik, Berlin, Germany. ivano.giuntoni@tu-berlin.de

Optics Express
|May 9, 2012
PubMed
Summary

This study presents an integrated delay line using tapered Bragg gratings. The silicon-on-insulator device offers tunable delay for high-speed optical communication systems.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Semiconductor Devices

Background:

  • Integrated optical delay lines are crucial for high-speed optical signal processing.
  • Tapered Bragg gratings offer a promising platform for on-chip optical functionalities.
  • Silicon-on-insulator (SOI) technology enables compact and efficient photonic integrated circuits.

Purpose of the Study:

  • To demonstrate an integrated tunable delay line using tapered Bragg gratings in a drop-filter configuration.
  • To investigate the thermo-optical tuning characteristics and performance of the device.
  • To assess the potential for high-bit-rate optical communication applications.

Main Methods:

  • Fabrication of the device on silicon-on-insulator (SOI) rib waveguides using Deep-UV 248 nm lithography.

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  • Utilizing the thermo-optical effect for continuous delay tuning.
  • Experimental characterization of the tuning range, tuning coefficient, and system performance.

    • Main Results:

    • Achieved a continuous delay tunability of 450 picoseconds (ps).
    • Measured a tuning coefficient of -51 ps/°C.
    • Demonstrated system operation at a bit rate of 25 Gigabits per second (Gbit/s), with potential extension to 80 Gbit/s.

    Conclusions:

    • The developed integrated delay line based on tapered Bragg gratings is a viable component for optical signal processing.
    • The thermo-optical tuning provides effective control over the delay characteristics.
    • The device shows significant potential for future high-speed optical communication networks, especially with dispersion compensation.