期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 22, 期 23, 页码 1744-1746出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2010.2085040
关键词
Fiber couplers; silicon waveguide; silicon nitride waveguide
We demonstrate a novel facet coupler for coupling between 10.4-mu m mode-diameter cleaved fibers and high-index-contrast Si3N4 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 x 400 nm Si3N4 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 x 220 nm Si waveguides at 1550 nm is also demonstrated.
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