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We demonstrate highly compact optical add-drop filters based on silicon-on-insulator microring resonators. The microring resonators have a small radius of 2.5 mum and a very large free spectral range ~ 32 nm at the 1.55 mum communication band. The propagation loss in such small micoring resonators was experimentally determined and shown to be extremely important in designing microring add-drop filters...
Mode-transition loss in silicon-on-insulator strip waveguides is reduced from 0.019 dB/transition to 0.0046 dB/transition for a bending radius of 4.5 micrometer, by adding a gradual-transition curved waveguide to connect the bend section and straight section.
We demonstrate accurately spaced 8-channel micro-ring resonators on a silicon-on-insulator platform via thermal tuning. The thermal cross talk between adjacent micro heaters is small.
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