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[1] Jaime Cardenas, et al., ¡°High Coupling Efficiency Etched Facet Tapers in Silicon Waveguides,¡± IEEE Phot. Tech. Lett. VOL. 26, NO. 23, 2380-2382 (2014)
[2] Vilson R. Almeida, et al., "Nanotaper for compact mode conversion," Opt. Lett. 28, 1302-1304 (2003);

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