Design and demonstration of compact, wide bandwidth coupled-resonator filters on a silicon-on-insulator platform

We design and fabricate a compact third-order coupledresonator filter on the silicon-on-insulator platform with focused application for on-chip optical interconnects. The filter shows a large flat bandwidth (3dB 3.3nm), large FSR (similar to 18nm), more than 18dB out-of-band rejection at the drop port and more than 12 dB extinction at the through port, as well as a negligible drop loss (< 0.5dB) within a footprint of 0.0004 mm(2).