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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1364/OL.42.003566
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Name affiliation
  1. National Research Council of Canada. Information and Communication Technologies
FormatText, Article
Journal titleOptics Letters
ISSN0146-9592
1539-4794
Volume42
Issue18
Pages3566–3569
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
PublisherOSA Publishing
LanguageEnglish
Peer reviewedYes
NPARC number23002264
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