Abstract
We demonstrate a large-mode-volume transverse-electric-polarized λ/4 shifted
distributed feedback (DFB) cavity on silicon-on-insulator (SOI). A 2.86 mm-long DFB
cavity with sidewall corrugation on the ridge is fabricated on a silicon rib waveguide.
The cavity structure is designed to enlarge both the longitudinal and transversal mode
profiles of the cavity to enclose more luminescent media. Design strategies are verified
by both finite difference time domain simulation and experiments. A linewidth of 69 pm
and an extinction ratio of 15 dB is obtained, indicating not only the well confinement
of the longitudinal mode, but also its well stretching to the cavity ends. The mode
volume is 75.39 μm3.
© 2015 Chinese Laser Press
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