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- Title
Active On-Chip Dispersion Control Using a Tunable Silicon Bragg Grating.
- Authors
Klitis, Charalambos; Sorel, Marc; Strain, Michael J.
- 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.
- Subjects
BRAGG gratings; PICOSECOND pulses; DISPERSION (Chemistry); REFRACTIVE index; SILICON; FREE-space optical technology
- Publication
Micromachines, 2019, Vol 10, Issue 9, p569
- ISSN
2072-666X
- Publication type
Article
- DOI
10.3390/mi10090569