Abstract
In this paper, we experimentally demonstrate continuously tunable pulse propagation in
SOI microring resonators with mutual mode coupling, which is induced by nanosized gratings
along the ring sidewalls. In the presence of the mutual mode coupling, dispersion-induced
group delay is investigated in single-waveguide and double-waveguide coupled single-ring
resonators, respectively. In particular, pulse propagation in the drop channel of a
double-waveguide coupled resonator is observed and exhibits continuously tunable delay and
advancement features in the experiment. Delayed pulses are also obtained at the reflection
port of a single-waveguide coupled resonator due to the existence of backward whispering
gallery mode (WGM).
© 2009 IEEE
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