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Investigation of the fiber B ragg grating inscribed in multimode fiber by femtosecond laser
Author(s) -
Jiang Yajun,
Yang Dexing,
Yuan Yuan,
Xu Jian,
Li Dong,
Wang Meirong,
Zhao Jianlin
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30260
Subject(s) - fiber bragg grating , optics , materials science , multi mode optical fiber , femtosecond , grating , laser , fiber laser , polarization maintaining optical fiber , graded index fiber , fiber optic sensor , optical fiber , optoelectronics , physics
Multimode fiber Bragg grating (MFBG) is inscribed in graded‐index multimode fiber using infrared femtosecond laser and phase mask. Multiple dips are observed in the transmission spectrum of MFBG. There is not only self‐coupling effect between the forward and backward principal modes, but also the mutual coupling effect between the neighbor modes. The induced refractive index modulation of 6.4 × 10 −4 is achieved for a peak power density of 4.1 × 10 13 W/cm 2 without any fiber sensitization. Thermal experiment results show that the MFBG belongs to type I grating. The transmission spectrum of MFBG shifts linearly with the strain and pressure at sensitivities of 1.27 ± 0.002 pm/με and −3.3 ± 0.06 pm/MPa, respectively. The MFBGs are expected to be used for multichannel filters, multiwavelength fiber lasers, and multiparameter sensing. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:214–219, 2017