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oai:riuma.uma.es:10630/399412026-02-03T11:08:08Zcom_10630_2254col_10630_37953

Fernández-Hinestrosa, Fernando Luque-González, José Manuel Cheben, Pavel Schmid, Jens H. Sánchez-Postigo, Alejandro Wanguemert-Pérez, Juan Gonzalo Molina-Fernández, Íñigo Ortega-Moñux, Alejandro 2025-09-16T11:48:13Z 2025-09-16T11:48:13Z 2025-07 A. Fernández-Hinestrosa, J. M. Luque-González, P. Cheben, J. H. Schmid, A. Sánchez-Postigo, J. G. Wangüemert-Pérez, I. Molina-Fernández, A. Ortega-Moñux, Polarization-Independent Complex Bragg Grating Filters on Silicon Nitride. Laser Photonics Rev 2025, e02114. https://doi.org/10.1002/lpor.202402114 https://hdl.handle.net/10630/39941 10.1002/lpor.202402114 Integrated optical filters are essential components of on-chip multiplexers, which play a critical role in enhancing data throughput for high-demand networks. Since optical multiplexers are typically connected through fiber-optic links where the polarization state of light fluctuates randomly, polarization insensitivity is an important prerequisite for integrated optical filters. In this work, polarization-insensitive optical filters are demonstrated on the silicon nitride platform operating in the datacom O-band. The filters are based on cladding-modulated Bragg gratings, which offer improved fabrication tolerances and reduced losses compared to conventional sidewall gratings. By judiciously designing grating dimensions, filters are demonstrated with single-band, dual-band, and four-band spectral characteristics. The fabricated filters achieve an insertion loss below 1.0 dB and a band rejection greater than 25 dB for spectral bands that are 3 nm wide and 9 nm apart. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Filtros ópticos Fotónica Sistemas de telecomunicaciones Polarization-independent complex bragg grating filters on silicon nitride journal article