Abstract
We demonstrate theoretically a tunable optical ring resonator
incorporating an asymmetric Mach–Zehnder interferometer (MZI) and
two phase shifters. The optimal resonance state of the ring resonator with
different geometries can be achieved by tuning the two embedded phase
shifters. Distinct intensity and phase responses and transmission spectra
characteristics are newly observed by setting different structural
parameters such as the asymmetrical path lengths of the waveguides and the
coupling ratio of the directional couplers in the MZI. The performance
characteristics related to the radius of the ring cavity and the propagation
losses in the waveguides are also discussed. At optimal resonance, it is
shown that sharp intensity response and tunable narrow-bandwidth spectra can
be achieved especially for resonators with a highly asymmetrical
configuration. Such device has a potential in sensing, switching and
filtering applications.
© 2010 IEEE
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