Bragg gratings in rectangular microfiber for temperature independent refractive index sensing

We present fiber Bragg grating fabricated in rectangular microfiber for temperature-independent refractive index (RI) measurement. The grating has two Bragg peaks due to the high geometrical birefringence of the rectangular microfiber. The two peaks present different RI responses because the modes a...

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Bibliographic Details
Published in:Optics letters 2012-07, Vol.37 (13), p.2649-2651
Main Authors: Ran, Yang, Jin, Long, Sun, Li-Peng, Li, Jie, Guan, Bai-Ou
Format: Article
Language:English
Subjects:
Birefringence
Bragg gratings
Detection
Liquids
Microfibers
Optical Fibers
Optical Phenomena
Refractive index
Refractivity
Silicon dioxide
Temperature
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Summary:We present fiber Bragg grating fabricated in rectangular microfiber for temperature-independent refractive index (RI) measurement. The grating has two Bragg peaks due to the high geometrical birefringence of the rectangular microfiber. The two peaks present different RI responses because the modes along the orthogonal polarizations have different energy fractions in terms of evanescent field outside the silica microfiber and hence the light/liquid interaction strength are different. In contrast, they exhibit identical temperature sensitivities because most mode energy is confined in the microfiber and the thermal-optic effect of silica dominantly determines the temperature response. As a result, temperature-independent RI sensing can be realized by monitoring the wavelength separation between the two peaks.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.002649