Ideal, constant-loss nanophotonic mode converter using a Lagrangian approach

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DOIResolve DOI: http://doi.org/10.1364/OE.24.006680
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TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume24
Issue6
Pages66806688
SubjectIntegrated optics; Optoelectronics; Integrated optics devices
AbstractCoupling light between an optical fiber and a silicon nanophotonic waveguide is a challenge facing the field of silicon photonics to which various mode converters have been proposed. Inverted tapers stand out as a practical solution enabling efficient and broadband mode conversion. Current design approaches often use linearly-shaped tapers and two dimensional approximations; however, these approaches have not been rigorously verified and there is not an overarching design framework to guide the design process. Here, using a Lagrangian formulation, we propose an original, constant-loss framework for designing shape-controlled photonic devices and apply this formalism to derive an ideal constant-loss taper (CLT). We specifically report on the experimental demonstration of a fabrication-tolerant, 15-µm-long CLT coupler, that produces 0.56 dB fiber-chip coupling efficiency, the highest efficiency-per-length ratio ever reported.
Publication date
PublisherOSA Publishing
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number23000412
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Record identifier7b0d052f-dcd0-49c8-a1b7-f62f9bae926a
Record created2016-07-14
Record modified2016-07-14
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