Microstructured PMMA POF chirped Bragg gratings for strain sensing

[EN] We demonstrate a chirped microstructured polymer fiber Bragg grating based on taper technology for strain sensing application. The effective bandwidth of the grating is dependent on strain and remains practically constant with respect to temperature and humidity changes. We report a sensitivity of 0.90 pm/mu e for the central wavelength under stable temperature and humidity values. The 3-dB bandwidth of the grating has been measured under different temperature and humidity conditions.
The authors acknowledge the financial support from FCT through the fellowship SFRH/BPD/109458/2015, program UID/EEA/50008/2013 by the National Funds through the Fundacao para a Ciencia e a Tecnologia/Ministerio da Educacao e Ciencia, and the European Regional Development Fund under the PT2020 Partnership Agreement. This work was also supported by the Research Excellence Award Programme GVA PROMETEO 2017/103 and the Science Foundation of Heilongjiang Province of China (2018026).