Experimental demonstration of an apodized-imaging chip-fiber grating coupler for Si3N4 waveguides

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DOI	Resolve DOI: https://doi.org/10.1364/OL.42.003566
Author	Search for: Chen, Yang; Search for: TBucio, halia Domínguez; Search for: Khokhar, Ali Z.; Search for: Banakar, Mehdi; Search for: Grabska, Katarzyna; Search for: Gardes, Frederic Y.; Search for: Halir, Robert; Search for: Molina-Fernández, Íñigo; Search for: Cheben, Pavel¹ ; Search for: He, Jian-Jun
Name affiliation	National Research Council Canada. Information and Communication Technologies
Format	Text
Type	Article
Proceedings title	Optics Letters
ISSN	0146-9592 1539-4794
Volume	42
Issue	18
Pages	3566–3569
Abstract	A silicon nitride waveguide is a promising platform for integrated photonics, particularly due to its low propagation loss compared to other complementary metal–oxide–semiconductor compatible waveguides, including silicon-on-insulator. Input/output coupling in such thin optical waveguides is a key issue for practical implementations. Fiber-to-chip grating couplers in silicon nitride usually exhibit low coupling efficiency because the moderate index contrast leads to weak radiation strengths and poor directionality. Here, we present the first, to the best of our knowledge, experimental demonstration of a recently proposed apodized-imaging fiber-to-chip grating coupler in silicon nitride that images an in-plane waveguide mode to an optical fiber placed at a specific distance above the chip. By employing amplitude and phase apodization, the diffracted optical field of the grating is matched to the fiber mode. High grating directionality is achieved by using staircase grating teeth, which produce a blazing effect. Experimental results demonstrate an apodized-imaging grating coupler with a record coupling efficiency of −1.5 dB and a 3 dB bandwidth of 60 nm in the C-band.
Publication date	2017-09-11
Publisher	OSA Publishing
Language	English
Peer reviewed	Yes
NPARC number	23002264
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Record identifier	facea2fb-0bd6-41ea-a70e-cbb7b1c2ef30
Record created	2017-09-26
Record modified	2019-03-13

Date modified:: 2019-11-14

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