A cascaded set of Mach-Zehnder interferometers with proportionally tuned phases performs circular convolution on input light, letting a ~$10 miniature near-infrared spectrometer recover spectra with a single inverse DFT.
Abstract Optical spectrometers are fundamental across numerous disciplines in science and technology
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Optical Convolutional Spectrometer
A cascaded set of Mach-Zehnder interferometers with proportionally tuned phases performs circular convolution on input light, letting a ~$10 miniature near-infrared spectrometer recover spectra with a single inverse DFT.