Mid-infrared silicon-on-insulator Fourier-transform spectrometer chip

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1109/LPT.2015.2496729
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Name affiliation
  1. National Research Council Canada. Information and Communication Technologies
FormatText
TypeArticle
Journal titleIEEE Photonics Technology Letters
ISSN1041-1135
1941-0174
Volume28
Issue4
Pages528–531
SubjectSilicon photonics; Spectroscopy; Infrared
Abstract
Mid-infrared absorption spectroscopy is highly relevant for a wide range of sensing applications. In this letter, we demonstrate a Fourier-transform spectrometer chip based on the principle of spatial heterodyning implemented in the silicon-on-insulator waveguide platform, and operating near 3.75-μm wavelength. The spectrometer comprises a waveguide splitting tree feeding to an array of 42 Mach-Zehnder interferometers with linearly increasing optical path length differences. A spectral retrieval algorithm based on calibration matrices is applied to the stationary output pattern of the array, compensating for any phase and amplitude errors arising from fabrication imperfections. A spectral resolution below 3 nm is experimentally demonstrated.
Publication date
PublisherIEEE
LanguageEnglish
Peer reviewedYes
NPARC number23000044
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