14 November 2016 Optical fiber refractometer based on tapered tilted-fiber Bragg grating
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Abstract
Tilted fiber Bragg gratings (TFBGs) have been demonstrated to be accurate refractometers as they couple light from the fiber core to the cladding. In our experiment, we changed the physical structure of the TFBGs to improve the refractive index sensing ability. One way is to stretch the grating section 5 mm longer. The result showed that not only the number of the cladding mode of the TFBG decreases but also the full width half-maximum (FWHM) of the cladding modes and core mode changes. The FWHM of the cladding mode of the tapered TFBG is more than twice than that of the original. However, the refractive index sensitivity of the tapered TFBG has no obvious improvement. Another way is to etch the grating section with 20% hydrofluoric acid solution. We find that the smaller the clad diameter, the higher the refractive index sensitivity of the TFBG.
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Tao Wang, Tao Wang, Tiegen Liu, Tiegen Liu, Kun Liu, Kun Liu, Junfeng Jiang, Junfeng Jiang, Zhe Yu, Zhe Yu, Meng Xue, Meng Xue, } "Optical fiber refractometer based on tapered tilted-fiber Bragg grating", Proc. SPIE 10025, Advanced Sensor Systems and Applications VII, 1002506 (14 November 2016); doi: 10.1117/12.2247747; https://doi.org/10.1117/12.2247747
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