| Summary: | We propose and experimentally demonstrate the enhancement in the filtering quality (Q)
factor of an integrated micro-ring resonator (MRR) by embedding it in an integrated
Fabry-Perot (FP)
cavity
formed by cascaded Sagnac loop reflectors. By utilizing coherent interference within
the FP cavity to reshape the transmission spectrum of the MRR, both the Q
factor and the extinction ratio (ER) can be significantly improved. The device is
theoretically analyzed and practically fabricated on a silicon-on-insulator wafer.
Experimental results show that up to 11-times improvement in the Q factor, together with
an 8-dB increase in the ER, can be achieved via our proposed method. The impact of varying
structural parameters on the device performance is also investigated and verified by the
measured spectra
of the fabricated devices with different structural parameters.
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