TY  - JOUR
IS  - 9
TI  - Active on-chip dispersion control using a tunable silicon Bragg grating
PB  - MDPI
A1  - Klitis, Charalambos
A1  - Sorel, Marc
A1  - Strain, Michael J.
UR  - https://eprints.gla.ac.uk/194254/
ID  - enlighten194254
JF  - Micromachines
Y1  - 2019/08//
N2  - 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.
AV  - public
N1  - Funding: This research was funded by EPSRC grant numbers EP/P013597/1, EP/P013570/1, and EP/L021129/1
VL  - 10
SN  - 2072-666X
ER  -