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Cladding waveguide gratings in standard single-mode fiber for 3D shape sensing

: Waltermann, C.; Doering, A.; Köhring, M.; Angelmahr, M.; Schade, W.


Optics Letters 40 (2015), Nr.13, S.3109-3112
ISSN: 0146-9592
Fraunhofer HHI ()

Femtosecond laser pulses were used for the direct point-by-point inscription of waveguides into the cladding of standard single-mode fibers. Homogeneous S-shaped waveguides have been processed as a bundle of overlapping lines without damaging the surrounding material. Within these structures, FBGs have been successfully inscribed and characterized. A sensor device to measure the bending direction of a fiber was created by two perpendicular inscribed cladding waveguides with FBG. Finally, a complete 3D shape sensor consisting of several bending sensor planes, capable of detecting bending radii even below 2.5 cm is demonstrated.