preprint submitted Carson G. Valdez author Anne R. Kroo author Marek Vlk author Charles Roques-Carmes author e2e68fc9-6505-11ef-a541-eb4e72cc3e82 Shanhui Fan author David A. B. Miller author Olav Solgaard author We demonstrate an integrated photonic circuit based on feed forward photonic meshes that can be programmed and reconfigured to perform arbitrary spectral filter functions. We investigate a subset of the available filter functions, demonstrating that a N = 4 input triangular mesh with M = 3 layers may be operated via self-configuration algorithms to filter M arbitrary wavelengths from a given input spectrum. The tunable nature of the architecture enables preconfigured filter functions to be swept in the spectral domain continuously over the free spectral range of the device. This removes any strict requirements between the design parameters of the architecture and the center wavelength of a desired filter function. With this architecture, we experimentally demonstrate arbitrary wavelength rejection filters with contrasts as deep as 40 dB. Further, by intentionally selecting the center wavelengths of each filter function to lie along a wavelength grid we demonstrate deep wavelength division demultiplexing (DWDM) with inter-channel crosstalk between -25 dB and -40 dB. Unlike typical DWDM systems, in this architecture the center wavelength of each channel is not fixed at fabrication and instead may be swept or reordered arbitrarily. This device demonstrates advantages over typical methods for DWDM, Raman spectroscopy, and correlation spectroscopy as well as other applications. 2025 eng 2509.1205910.48550/arXiv.2509.12059 yes Valdez, C. G., Kroo, A. R., Vlk, M., Roques-Carmes, C., Fan, S., Miller, D. A. B., &#38; Solgaard, O. (n.d.). Programmable optical filters based on feed-forward photonic meshes. <i>arXiv</i>. <a href="https://doi.org/10.48550/arXiv.2509.12059">https://doi.org/10.48550/arXiv.2509.12059</a> C.G. Valdez, A.R. Kroo, M. Vlk, C. Roques-Carmes, S. Fan, D.A.B. Miller, O. Solgaard, ArXiv (n.d.). Valdez CG, Kroo AR, Vlk M, et al. Programmable optical filters based on feed-forward photonic meshes. <i>arXiv</i>. doi:<a href="https://doi.org/10.48550/arXiv.2509.12059">10.48550/arXiv.2509.12059</a> Valdez, Carson G., Anne R. Kroo, Marek Vlk, Charles Roques-Carmes, Shanhui Fan, David A. B. Miller, and Olav Solgaard. “Programmable Optical Filters Based on Feed-Forward Photonic Meshes.” <i>ArXiv</i>, n.d. <a href="https://doi.org/10.48550/arXiv.2509.12059">https://doi.org/10.48550/arXiv.2509.12059</a>. Valdez CG, Kroo AR, Vlk M, Roques-Carmes C, Fan S, Miller DAB, Solgaard O. Programmable optical filters based on feed-forward photonic meshes. arXiv, 2509.12059. C. G. Valdez <i>et al.</i>, “Programmable optical filters based on feed-forward photonic meshes,” <i>arXiv</i>. . Valdez, Carson G., et al. “Programmable Optical Filters Based on Feed-Forward Photonic Meshes.” <i>ArXiv</i>, 2509.12059, doi:<a href="https://doi.org/10.48550/arXiv.2509.12059">10.48550/arXiv.2509.12059</a>. 216962026-04-09T09:10:41Z2026-04-13T11:01:05Z