The thermal nonlinear optical effect is observed in a microring resonator (MRR) based on a small SU-8
polymer ridge optical waveguide. It is found that the resonant wavelength blue shifts almost linearly
with a slope of about -0.8 pm/mW as the input power increases (which causes the increase in
temperature and consequently the decrease of the refractive index). Both the strong light-confinement
of the air-clad waveguide and the strong light-enhancement of the MRR cavity contribute to the
significant nonlinearity. The absorption mechanism is analyzed in detail, and the absorbance of about
0.179 cm-1 (around 1560 nm) is obtained.
By using small SU-8 polymer ridge waveguides, compact micro-racetrack resonator (MRR) add-drop filters are
presented. This used small ridge waveguide has an air-cladded SU-8 polymer core (n~1.573) on a SiO2 buffer (n~1.445)
so that the bending radius could be as small as ~102μm. Considering the resolution limitation of a regular UV-lithography
process, the gap in the coupling region of the present MRR in our design is no less than 1.0 μm. In order to
enhance the coupling between the access optical waveguide and the micro-racetrack, narrow optical waveguides are used
in the coupling regions. Meanwhile, wide optical waveguides are used in the bending sections to have a small bending
radius. And a single-side taper is used to connect these two sections with different widths so that the gap width is kept as
small as 1.0 μm in the whole region. With a regular UV lithography process, the designed micro-racetrack resonator
(MRR) add-drop filters are fabricated. The measured propagation loss for straight waveguides is about 0.1dB/mm and
the measured spectral responses of the through/drop ports show a Q-factor of 8000.
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