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We report experiments and simulations of spiral-shaped microdisk resonator channel drop/add filters with a non-evanescently-coupled waveguide at the spiral notch. We observe asymmetry in modal distributions between the drop/add filters at the same resonance wavelengths.
We propose non-evanescently pumped Raman silicon lasers using spiral-shaped microdisks. Our simulations suggest that pump lightwave can be seamlessly butt-coupled at the spiral notch, whereas the Stokes lightwave can be out-coupled either evanescently or non- evanescently.
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