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Título: | Recent advances in on-chip Fourier transform spectrometers |
Autor: | Cheben, Pavel; Podmore, H.; Herrero-Bermello, A. CSIC ORCID; Velasco, Aitor V. CSIC ORCID; Schmid, J. H.; Scott, A.; Vachon, M.; Lee, R.; Calvo, María L.; Xu, Dan-Xia; Janz, S.; Corredera, Pedro CSIC ORCID | Fecha de publicación: | 2-jul-2017 | Editor: | Institute of Electrical and Electronics Engineers | Citación: | 19th International Conference on Transparent Optical Networks (ICTON) (2017) | Resumen: | We report our advances in development of on-chip Fourier-transform spectrometers. Specifically, we present applications of subwavelength engineered waveguides in a new type of a compressive-sensing Fourier-transform spatial heterodyne spectrometer chip. The spectrometer is implemented as an array of Mach-Zehnder interferometers (MZIs) integrated on a photonic chip, in a spatial heterodyne configuration [1]. The signal from a set of MZIs comprises an undersampled discrete Fourier interferogram, which is inverted using L1-norm minimization technique to retrieve a sparse input spectrum. To implement this technique we use a subwavelength-engineered Fourier-transform spectrometer on a chip comprising 32 independent MZIs [2]. We successfully demonstrate the retrieval of sparse input signals by collecting data from restricted sets (8 and 14) of MZIs and applying common compressive-sensing 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 1/4th of a conventional (non-compressive) design [3]. | Descripción: | Girona, Spain, 2-6 July 2017 | Versión del editor: | http://doi.org/10.1109/ICTON.2017.8024928 | URI: | http://hdl.handle.net/10261/167676 | DOI: | 10.1109/ICTON.2017.8024928 | Identificadores: | doi: 10.1109/ICTON.2017.8024928 e-issn: 2161-2064 |
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