Two novel fiber Bragg grating (FBG) based sensing schemes are proposed and experimentally demonstrated for directional bending measurement: One of which is based on two weakly titled Bragg gratings spliced together with tilt planes at nearly 90 degree, followed by a cleaved end mirror; the other one is based on an off-Axis printed FBG, which both exhibit large amount of cladding modes in transmission spectrum in contrast with that of a normal FBG. Well-chosen cladding resonances in these two structure are demonstrated respectively for ultra-sensitive bending measurement via power detection. Meanwhile the surrounding temperature is proven independent to fiber bent.

Additional Metadata
Keywords bending measurement, fiber Bragg grating, Optics fiber sensor
Persistent URL dx.doi.org/10.1109/ICOCN.2016.7875685
Conference 15th International Conference on Optical Communications and Networks, ICOCN 2016
Citation
Feng, D. (Dingyi), Qiao, X. (Xueguang), & Albert, J. (2017). Novel optical fiber Bragg grating designs for vector bending measurement. In ICOCN 2016 - 2016 15th International Conference on Optical Communications and Networks. doi:10.1109/ICOCN.2016.7875685