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. 2022 Jun 7;11:174. doi: 10.1038/s41377-022-00853-1

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Schematic illustration of the underlying principles for different on-chip integrated spectrometers, including WdM spectrometers based on (a) dispersive structure, (b) arrayed or tunable narrowband filters, and WM spectrometers based on (c) Fourier-transform spectrometers formed by tunable Mach–Zehnder interferometers, and (d) broadband filter or detector arrays with distinctive spectral responses for computational spectrum reconstruction, respectively