Fig. 3
From: High-performance and scalable on-chip digital Fourier transform spectroscopy
Sparse signal reconstruction. a Spectra consisting of two laser lines with varying spacing measured using the 64-channel dFT spectrometer and reconstructed by applying the elastic-D1 algorithm. Insets b and c show zoomed-in images of the narrow spectral features for input laser lines with 100 and 200 pm spacing, respectively
