The polarization independent tuning of the resonant wavelength of a vertically coupled microring resonator (VCMRR) filter is demonstrated using the thermo-optic effect in a polymer ring core. The polarization dependence of the tunability of a TO-tunable microring resonator was reduced to 3% using a new polymer with a high index contrast and a small birefringence for the ring core. Approximately 12.9 nm tuning was successfully demonstrated.
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Go et al. (2005) studied this question.
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