Abstract
We analyzed the dispersion characteristics of double-series-coupled
microring resonator filter and found that the coupling efficiency between
resonators for the zero third-order dispersion (Bessel–Thompson) filter
is one-third of that of a flat passband (Butterworth) filter. By controlling
the coupling efficiencies between waveguides, the flat-top group delay response
(Bessel–Thompson filter response) was realized. However, under the symmetric
arrangement of coupling efficiency, the Bessel–Thompson filter lost
transmittance by 1.25 dB. Thus we found the optimum condition of coupling
efficiencies for achieving zero third-order dispersion (flat-group delay)
with unity transmittance is an asymmetric arrangement of coupling efficiencies.
© 2008 IEEE
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