Active on-chip dispersion control using a tunable silicon Bragg grating

Charlambos Klitis, Marc Sorel, Michael J. Strain

Research output: Contribution to journalArticle

3 Citations (Scopus)
4 Downloads (Pure)

Abstract

Actively controllable dispersion in on-chip photonic devices is challenging to implement compared with free space optical components where mechanical degrees of freedom can be employed. Here we present a method by which continuously tunable group delay control is achieved by modulating the refractive index profile of a silicon Bragg grating using thermo-optic effects. A simple thermal heater element is used to create tunable thermal gradients along the grating length, inducing chirped group delay profiles. Both effective blue and red chirp are realised using a single on-chip device over nanometre scale bandwidths. Group delay slopes are continuously tunable over a few ps/nm range from red to blue chirp, compatible with on-chip dispersion compensation for telecommunications picosecond pulse systems.
Original languageEnglish
Article number569
Number of pages12
JournalMicromachines
Volume10
Issue number9
DOIs
Publication statusPublished - 28 Aug 2019

Keywords

  • silicon photonics
  • dispersion control
  • Bragg gratings

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