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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