ArticleNanophotonics (Berlin, Germany)2025
Multi-channel and free-spectral-range-free tunable add-drop filters on thin-film lithium niobate.
Article in Nanophotonics (Berlin, Germany), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- A Long-Period Grating Formed by Residual Stress on Thin-Film Lithium Niobate With Efficient Electro-Optic and Thermo-Optic Tuning.Nanophotonics (Berlin, Germany) · 2026Article
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5 authors.
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Abstract
Thin-film lithium niobate (TFLN) has emerged as an attractive platform for integrated tunable photonic filters owing to its strong electro-optic response and low optical loss. However, conventional resonant filters, such as micro-rings, are intrinsically constrained by a limited free spectral range (FSR), which hinders their use in broadband and multi-channel operations. Here we present a TFLN-based add-drop filter that overcomes this limitation by employing a side-coupled travelling-wave Fabry-Pérot (FP) cavity formed with asymmetric multimode waveguide gratings (AMWGs). By engineering the inter-modal coupling through waveguide width tailoring and the reflection bandwidth of AMWGs, we realize a cavity with an intrinsic quality factor of 2.5 × 10
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