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A simple but highly sensitive refractometer based on chirped fiber Bragg grating (CFBG) is proposed and investigated experimentally. Intensive reflected cladding modes can be excited within a large wavelength range through a multimode fiber CFBG structure. Experimental results show that the intensity of reflected cladding modes in CFBG is modulated by surrounding refractive index (RI) changes, which provide a high sensitive and cost-effective solution for RI measurement.
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Sun et al. (2011) studied this question.
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