Low-Loss and Broadband Cantilever Couplers Between Standard Cleaved Fibers and High-Index-Contrast Si$_{3}$N$_{4}$ or Si Waveguides
- 7 October 2010
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 22 (23) , 1744-1746
- https://doi.org/10.1109/lpt.2010.2085040
Abstract
We demonstrate a novel facet coupler for coupling between 10.4-m mode-diameter cleaved fibers and high-index-contrast SiN or Si waveguides. By creating a cantilevered glass waveguide surrounding an inverse taper and injecting a low-index cladding around the cantilever, we demonstrate coupling loss as low as 0.7 dB/facet to 500 nm 400 nm Si N waveguides, with only 0.2-dB polarization-dependent loss and 0.4-dB wavelength-dependent loss from 1480 to 1580 nm. Coupling loss of 1.5-2.0 dB/facet to 500 nm 220 nm Si waveguides at 1550 nm is also demonstrated.Keywords
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