Abstract
We fabricated and theoretically investigated an add–drop filter
(ADF) using an on-chip whispering gallery mode (WGM) microtoroid resonator
with ultrahigh-quality factor (<i>Q</i>) side coupled to two taper fibers, forming the bus and drop waveguides.
The new device design incorporates silica side walls close to the microresonators
which not only enable placing the coupling fibers on the same plane with respect
to the microtoroid resonator but also provides mechanical stability, leading
to an ADF with high drop efficiency and improved robustness to environmental
perturbations. We show that this new device can be thermally tuned to drop
desired wavelengths from the bus without significantly affecting the drop
efficiency, which is around 57%.
© 2012 IEEE
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