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Chip-scale dispersion engineering using chirped vertical gratings.

D T H Tan1, K Ikeda, R E Saperstein

  • 1Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093-0409, USA. thtan@ucsd.edu

Optics Letters
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

This study demonstrates a silicon photonic device with tunable dispersion for optical applications. Chirped Bragg gratings offer engineered group-velocity dispersion up to 7.0 x 10^5 ps/nm/km.

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Silicon photonics enables advanced optical devices.
  • Chirped Bragg gratings are crucial for dispersion engineering.

Purpose of the Study:

  • To design, fabricate, and characterize a strongly coupled, chirped Bragg grating in silicon.
  • To engineer group-velocity dispersion for photonic applications.

Main Methods:

  • Sinusoidal modulation of silicon waveguide sidewalls.
  • Fabrication and experimental characterization of the Bragg grating.
  • Asymmetric Blackman apodization for bandwidth and ripple control.

Main Results:

  • Demonstrated tunable operating wavelength and device bandwidth.
  • Achieved engineered group-velocity dispersion (normal or anomalous).
  • Obtained dispersion values up to 7.0 x 10^5 ps/nm/km at 1.55 microm.

Conclusions:

  • The chirped Bragg grating offers versatile dispersion engineering in silicon photonics.
  • Asymmetric Blackman apodization is optimal for maximizing bandwidth and suppressing ripples.
  • The device is suitable for various photonic applications requiring precise dispersion control.