Demonstration of a compressive-sensing Fourier-transform on-chip spectrometer

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1364/OL.42.001440
AuthorSearch for: ; Search for: ; Search for: 1ORCID identifier: https://orcid.org/0000-0003-4232-9130; Search for: ; Search for: 1; Search for: 1; Search for: 1
Name affiliation
  1. National Research Council Canada. Medical Devices
FormatText
TypeArticle
Journal titleOptics Letters
ISSN0146-9592
1539-4794
Volume42
Issue7
Pages1440–1443
Abstract
We demonstrate compressive-sensing (CS) spectroscopy in a planar-waveguide Fourier-transform spectrometer (FTS) device. The spectrometer is implemented as an array of Mach–Zehnder interferometers (MZIs) integrated on a photonic chip. The signal from a set of MZIs is composed of an undersampled discrete Fourier interferogram, which we invert using l1-norm minimization to retrieve a sparse input spectrum. To implement this technique, we use a subwavelength-engineered spatial heterodyne FTS on a chip composed of 32 independent MZIs. We demonstrate the retrieval of three sparse input signals by collecting data from restricted sets (8 and 14) of MZIs and applying common CS reconstruction techniques to this data. We show that this retrieval maintains the full resolution and bandwidth of the original device, despite a sampling factor as low as one-fourth of a conventional (non-compressive) design.
Publication date
PublisherOptical Society of America
LanguageEnglish
Peer reviewedYes
NPARC number23002314
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