Group delay and dispersion analysis of compound high order microring resonator all-pass filter

In this paper, we propose a novel compound high order microring resonator all-pass filter by employing an assistant microring between two cascaded microrings. It improves the dispersion compensation ability and provides a wide bandwidth. The extension of group delay range is shown in its group delay response, which allows flexible choice of the microring size for technical convenience and bend loss improvement. The careful design of coupling coefficients is able to optimize the group delay response.

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