Fabrication of side-polished fiber Bragg grating for refractive index sensor

Kuikui Guo; Jun He; Yiping Wang

doi:10.1117/12.2502852

23 October 2018 Fabrication of side-polished fiber Bragg grating for refractive index sensor

Kuikui Guo, Jun He, Yiping Wang

Proceedings Volume 10821, Advanced Sensor Systems and Applications VIII; 108210G (2018) https://doi.org/10.1117/12.2502852
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

A new type of refractive index (RI) sensor based on a side-polished fiber Bragg grating (FBG) has been experimentally demonstrated. At first, a FBG was inscribed in a single mode fiber by means of 267 nm fs laser irradiation through a uniform phase mask, which has an excellent spectral shape with a transmission loss of −9 dB (i.e., a high reflectivity of 87.41%), a 3dB bandwidth of 0.78 nm. Then, the portion of the fiber cladding enclosing the FBG was side-polished into a D-shaped configuration, and the D-shaped FBG was employed as an RI sensor. The removal of the fiber cladding via side-polishing technique ensures that the propagating core-mode of the FBG can interact with the external medium, and hence the Bragg wavelength of the D-shaped FBG will be sensitive to the RI change of the external medium. A conventional unpolished FBG demonstrated a linear relationship between the Bragg wavelength and the surrounding RI with a low sensitivity of ~1.8 pm/RIU at an RI of 1.45. For comparison, the side-polished FBG exhibited a considerably increased RI sensitivity of up to ~10 nm/RIU at an RI of 1.45. Hence, it may be attractive for biochemical sensing applications.

Citation Download Citation

Kuikui Guo, Jun He, and Yiping Wang "Fabrication of side-polished fiber Bragg grating for refractive index sensor", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 108210G (23 October 2018); https://doi.org/10.1117/12.2502852

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