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Multiple off-axis fiber Bragg gratings for 3D shape sensing

: Waltermann, C.; Bethmann, K.; Doering, A.; Jiang, Y.; Baumann, A.L.; Angelmahr, M.; Schade, W.


Applied optics 57 (2018), Nr.28, S.8125-8133
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Fraunhofer HHI ()

Point-by-point femtosecond laser processed fiber Bragg gratings are arranged around the edge of a standard single-mode optical fiber core. The relative amplitudes of at least three such fiber Bragg gratings are utilized to detect the central position of the mode field within the fiber core and calculate the local curvature of the fiber. An analytical approximation is given, and an experimental validation is performed.