Through femtosecond laser irradiation fiber Bragg grating (FBG) can be inscribed in two-mode fiber with neighboring cladding modes coupling in transmission spectrum, which is demonstrated for temperature-insensitive two-dimensional bend sensing in a low curvature range.

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Conference Optical Fiber Sensors, OFS 2018
Citation
Feng, D. (Dingyi), Jiang, Y. (Yajun), Liu, C. (Chi), Wang, H. (Haoyun), Zhao, J. (Jianlin), & Albert, J. (2018). Temperature-insensitive fiber vector microbend sensor based on two-mode grating inscribed by femtosecond laser. In Optics InfoBase Conference Papers.