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Polarization splitting directional coupler using tilted subwavelength gratings

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1364/OL.394696
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-6838-8641; Search for: ORCID identifier: https://orcid.org/0000-0001-7842-5007; Search for: ; Search for: ; Search for: ; Search for: 1; Search for: 1ORCID identifier: https://orcid.org/0000-0003-4232-9130; Search for: ORCID identifier: https://orcid.org/0000-0001-9596-4117; Search for:
Affiliation
  1. National Research Council of Canada. Advanced Electronics and Photonics
FormatText, Article
Abstract
On-chip polarization splitters are key elements for coherent optical communication systems and polarization diversity circuits. These devices are often implemented with directional couplers that are symmetric for one polarization and strongly asymmetric for the other polarization. To achieve this asymmetry, highly dissimilar waveguides are used in each coupler arm, often requiring additional material layers or etch steps. Here we demonstrate polarization splitting with a directional coupler composed of two fully etched subwavelength waveguides, differing only in the tilt angle of the silicon segments. Our device exhibits deep-UV compatible feature sizes, is 14 µm long, and covers a 72 nm bandwidth with insertion losses below 1 dB and an extinction ratio in excess of 15 dB.
Publication date
PublisherOptica
In
  • Optics Letters 45, no. 13 (17 June 2020): 3398–3401.
LanguageEnglish
Peer reviewedYes
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Record identifierb8f21c4d-5b57-4302-ac33-c058e921769b
Record created2022-06-07
Record modified2022-06-07
Date modified: