Abstract
We describe the optical bistability phenomenon in a silicon-on-insulator
microring resonators device by using an analytical theory, which includes
both linear and nonlinear effects such as two-photon absorption, Kerr effect,
free carrier and thermo-optic effect (TOE). We show that the bistable switching
threshold and the hysteresis loop width can be tuned by geometrical parameters
of the device and by the nonlinear parameters. The accuracy of the analytical
approach is verified by comparing the spectrum responds with the predicting
data from a commercial finite-difference time-domain software tool, and a
very close agreement is found between the two when TOE is incorporated in
analytical theory. In addition, our analysis reveals that a new type of hysteresis
loop occurs at low input intensity. The mode suppression of the designed device
by Vernier effect for tunable filter applications is also briefly discussed.
© 2013 IEEE
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