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We demonstrate advanced integrated photonic filters in silicon-on-insulator(SOI) nanowires implemented by cascaded Sagnac loop reflector (CSLR)resonators. We investigate mode splitting in these standing-wave (SW)resonators and demonstrate its use for engineering the spectral profile ofon-chip photonic filters. By changing the reflectivity of the Sagnac loopreflectors (SLRs) and the phase shifts along the connecting waveguides, wetailor mode splitting in the CSLR resonators to achieve a wide range of filtershapes for diverse applications including enhanced light trapping, flat-topfiltering, Q factor enhancement, and signal reshaping. We present thetheoretical designs and compare the CSLR resonators with three, four, and eightSLRs fabricated in SOI. We achieve versatile filter shapes in the measuredtransmission spectra via diverse mode splitting that agree well with theory.This work confirms the effectiveness of using CSLR resonators as integratedmulti-functional SW filters for flexible spectral engineering.

Silicon photonic filters based on cascaded Sagnac loop resonators