7 March 2014 Temperature-compensated fiber optic 3D shape sensor using femtosecond laser direct-written Bragg grating waveguides
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Abstract
A fiber-optic 3D shape, position and temperature sensor is demonstrated with femtosecond laser direct-written optical and Bragg grating waveguides that were distributed axially and radially inside a single coreless optical fiber. Efficient light coupling between the laser-written optical circuit elements and a standard single-mode optical fiber was obtained by 3D laser writing of a 1 × 3 directional coupler and fusion splicing. Coupler optimization by real-time monitoring of Bragg grating strengths is discussed. Simultaneous interrogation of nine Bragg gratings is presented through a single waveguide port to follow the Bragg wavelength shifts and thereby infer shape and temperature profile along the fiber length.
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K. K. C. Lee, A. Mariampillai, M. Haque, B. A. Standish, V. X. D. Yang, P. R. Herman, "Temperature-compensated fiber optic 3D shape sensor using femtosecond laser direct-written Bragg grating waveguides", Proc. SPIE 8972, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV, 897210 (7 March 2014); doi: 10.1117/12.2042264; https://doi.org/10.1117/12.2042264
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