Abstract
The spectral characteristics of a ring resonator made of Si photonic
wires are modeled using mode expansion of supermodes of the directional coupler.
The influence of the coupling coefficient, loss factor and waveguide dispersion
on the spectral features are analyzed in detail. The model is then compared
with the experimental data of a ring resonator designed for sensing purposes.
The model that includes a wavelength dependence on coupling length reproduces
the large variations of the envelope of the experimental spectrum, when coupling
coefficient cover its full range from 0 to 1. Fitting parameters explain the
details of the experimental spectrum and contribute to the sensor optimization,
as well as illustrating general guidelines for ring resonator design.
© 2009 IEEE
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