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We report a 1 times 4 wavelength reconfigurable photonic switch based on thermally tuned microring resonators (MRs) fabricated on a silicon-on-insulator substrate. The high refractive index of silicon facilitates the formation of highly confined optical waveguides and MRs. With a fabricated ring diameter of about 10 mum, the MRs support 18-nm free-spectral range and 0.15-nm resonant spectral linewidth...
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