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Active On-Chip Dispersion Control Using a Tunable Silicon Bragg Grating.

Charalambos Klitis1, Marc Sorel1, Michael J Strain2

  • 1School of Engineering, University of Glasgow, G12 8LT, UK.

Micromachines
|August 31, 2019
PubMed
Summary
This summary is machine-generated.

This study presents a novel method for actively controlling dispersion in on-chip photonic devices. A silicon Bragg grating modulated by thermo-optic effects allows for tunable group delay, enabling on-chip dispersion compensation.

Keywords:
Bragg gratingsdispersion controlsilicon photonics

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Controlling dispersion in on-chip photonic devices is difficult compared to free-space optics.
  • Mechanical adjustments are not feasible for integrated optical components.

Purpose of the Study:

  • To demonstrate a method for continuously tunable group delay control in silicon photonic devices.
  • To achieve actively controllable dispersion using thermo-optic effects.

Main Methods:

  • Modulating the refractive index profile of a silicon Bragg grating.
  • Utilizing thermo-optic effects with a thermal heater element to create thermal gradients.
  • Inducing chirped group delay profiles through controlled heating.

Main Results:

  • Achieved continuously tunable group delay control.
  • Demonstrated both effective blue and red chirp using a single on-chip device.
  • Group delay slopes were tunable over a few ps/nm range.

Conclusions:

  • The developed on-chip device offers compatible dispersion compensation for telecommunications picosecond pulse systems.
  • This thermo-optic approach provides an effective solution for actively controllable dispersion in integrated photonics.