Abstract:<p><b>We theoretically investigate advanced multi-functional
integrated photonic filters formed by three waveguide coupled Sagnac loop
reflectors (3WC-SLRs). By tailoring the coherent mode interference, the
spectral response of the 3WC-SLR resonators is engineered to achieve diverse
filtering functions with high performance. These include optical analogues of
Fano resonances that yield ultrahigh spectral extinction ratios (ERs) and slope
rates, resonance mode splitting with high ERs and low free sp… Show more
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