Optimized design of flat-band finite-size Coupled Resonator optical waveguides with reduced in-band distortions

Silicon-on-insulator (SOI) finite-size CROWs with optimized flat-band spectrum, excellent group-delay response, and compact size are experimentally demonstrated using direct correspondence with ladder-type LC circuits. Sensitivity analysis attributes residual distortions to non-ideal fabrication rather than coupling-induced-frequency-shifts.