Realization of alignment-tolerant grating couplers for z-cut thin-film lithium niobate.

Author(s) Kar, A.; Bahadori, M.; Gong, S.; Goddard, L.L.
Journal Opt Express
Date Published 2019 May 27
Abstract

We present the design, modeling, fabrication, and characterization of grating coupler devices for z-cut lithium niobate near 1550 nm. We first experimentally measure the sensitivity of the insertion loss of a conventional grating coupler to translational misalignment through a three-factor full factorial design of experiment. Next, we design grating couplers that are significantly less sensitive to misalignment. The fabricated devices experienced less than 7 dB of excess insertion loss for combined misalignments of up to ± 5 μm in plane and up to -2 μm or + 10 μm out of plane.

DOI 10.1364/OE.27.015856
ISSN 1094-4087
Citation Kar A, Bahadori M, Gong S, Goddard LL. Realization of alignment-tolerant grating couplers for z-cut thin-film lithium niobate. Opt Express. 2019;27(11):15856-15867.

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