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

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

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Actively controllable dispersion in on-chip photonic devices is challenging to implement compared with free j??kaapin raikastin 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 kit purge campagnolo tunable over a few ps/nm range from red to blue chirp, compatible with on-chip dispersion compensation for telecommunications picosecond pulse systems.