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Loss mechanism of slot ring resonators based on straight bus-ring directional couplers is experimentally analyzed by characterizing add-drop ring resonators and ring enhanced Mach-Zehnder interferometers. The coupler is proved to be the main parasitic loss, thus giving interesting directions to improve slot waveguide micro-ring resonators for strong light-matter interactions.
Broadband 1×4 thermo-optic switch is demonstrated based on four W2 photonic crystal waveguides with footprint of 17.6 µm×8 µm. Extinction ratio larger than 15dB is obtained over the bandwidth of 15±1 nm in each channel.
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