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Silicon photonics beyond the singlemode regime is applied for enabling ultralow‐loss waveguide propagation for the fundamental mode even without any special fabrication process. Here a micro‐racetrack resonator is fabricated with a standard 220‐nm‐SOI (silicon‐on‐insulator) multiproject‐wafer foundry and shows a record high intrinsic quality factor of 1.02×107, corresponding to an ultralow propagation...
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