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We demonstrate ultra-compact spectral shaping via thermo-optically tunable multiple-channel micro-ring resonators on a silicon chip, and combine it with frequency-time mapping to achieve controllable photonic radio-frequency waveform generation.
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...
We demonstrate critically coupled silicon microring resonators with intrinsic Q close to 300,000 and mode volume Vap20times(lambda/ne)3. For sub-mW optical power, large pump induced resonance shifts were observed for applications in all-optical switching.
Detailed performance of silicon microring filters is analyzed, including amplitude, phase, bandwidth and free spectral range. With experiments and simulations, we show that unavoidable trade-off must be taken among these parameters.
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 resonance wavelength shift in high-Q silicon microring resonators by varying a CW optical pump input. The wavelength shift, proportional to the square of the pump power, is attributed to two-photon absorption induced thermal-optic effect.
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