Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers

2020 
We demonstrate adiabatically tapered fibers clad with a higher-index material for coupling to an on-chip waveguide. The loss from fiber to a sub-micron waveguide in a packaged device is 1.3 dB, and the 3 dB bandwidth is is 90 nm.
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