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Achieving this precision typically requires complex and costly post\u2010fabrication processes or thermo\u2010optic tuning using resistive heaters. In this work, we demonstrate active trimming of ring resonators on a SiN platform using a  cladding layer. A DC bias is applied in order to tune an optical modulator in the optimal point of operation while maintaining a constant high\u2010frequency response. This approach is promising for high\u2010speed applications where precise tuning is critical.<\/jats:p>","DOI":"10.1002\/nap2.70059","type":"journal-article","created":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T07:43:39Z","timestamp":1775288619000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Active Trimming of High\u2010Speed SiN Photonic Micro Ring Resonators Using Thin Film Ferroelectrics"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9701-3655","authenticated-orcid":false,"given":"Tom","family":"Vanmaele","sequence":"first","affiliation":[{"name":"Department of Electronics and Information Systems Ghent University  Gent Belgium"},{"name":"Photonics Research Group, Department of Information Technology Ghent University\u2010imec  Gent 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