Khan, S.
, Shainline, J.
, Mirin, R.
, Nam, S.
, Buckley, S.
and Chiles, J.
(2020),
Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers, APL Photonics, [online], https://doi.org/10.1063/1.5145105
(Accessed December 11, 2024)
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Low-loss, high-bandwidth fiber-to-chip coupling using capped adiabatic tapered fibers
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Abstract
We demonstrate adiabatically tapered fibers terminating in sub-micron tips that are clad with a higher-index material for coupling to an on-chip waveguide. This cladding enables coupling to a high-index waveguide without losing light to the buried oxide. A technique to clad the tip of the tapered fiber with a higher-index polymer is introduced. Conventional tapered waveguides and forked tapered waveguide structures are investigated for coupling from the clad fiber to the on-chip waveguide. We find the forked waveguide facilitates alignment and packaging, while the conventional taper leads to higher bandwidth. The insertion loss from a fiber through a forked coupler to a sub-micron silicon nitride waveguide is 1.1 dB and the 3 dB bandwidth is 90 nm. The coupling loss in the packaged device is 1.3 dB. With a fiber coupled to a conventional tapered waveguide, the loss is 1.4 dB with a 3 dB bandwidth extending beyond the range of the measurement apparatus, estimated to exceed 250 nm.Citation
APL Photonics
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Created May 1, 2020, Updated October 5, 2022