Abstract
Asymmetric spectral responses of microring resonators are analyzed by
modeling the coupling region as a two-input/two-output
Mach–Zehnder interferometer (MZI). The asymmetric behavior is
dictated by the phase difference between the pole and zero, which is a
physical result of different optical losses on the upper and lower MZI arms.
The coupling region is further modeled as a frequency dependent element by
making the MZI arms asymmetric in length. From this model, it is easy to
identify the impact on pole and zero magnitudes as well as relative phases,
and thus predict the spectral amplitude response over the free-spectral
range of the coupler MZI. We verify this model using experimental data and
show physical evidence of the asymmetric spectral response and its
origin.
© 2010 IEEE
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