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Tunable Polymer Fiber Bragg Grating (FBG) Inscription: Fabrication of Dual-FBG Temperature Compensated Polymer Optical Fiber Strain Sensors

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3 Author(s)
Wu Yuan ; Department of Photonics Engineering, DTU Fotonik, Technical University of Denmark, Kongens, Lyngby, Denmark ; Alessio Stefani ; Ole Bang

We demonstrate stable wavelength tunable inscription of polymer optical fiber Bragg gratings (FBGs). By straining the fiber during FBG inscription, we linearly tune the center wavelength over 7 nm with less than 1% strain. Above 1% strain, the tuning curve saturates and we show a maximum tuning of 12 nm with 2.25% strain. We use this inscription method to fabricate a dual-FBG strain sensor in a poly (methyl methacrylate) single-mode microstructured polymer optical fiber and demonstrate temperature compensated strain sensing around 850 nm.

Published in:

IEEE Photonics Technology Letters  (Volume:24 ,  Issue: 5 )