Abstract
A single-mode polymer optical fiber (POF) with highly photosensitive core
doped with benzil dimethyl ketal (BDK) is fabricated and used for writing Bragg
grating through the two-beam interference method. The Bragg wavelength of the
grating is about 1570 nm, while the full-width at half-maximum (FWHM) of the
reflection peak is 0.3 nm. The temperature response of POF Bragg grating is
theoretically analyzed and experimentally measured in contrast to silica optical
fiber Bragg grating (FBG). The result shows that the temperature character of POF
Bragg grating is negative, which is opposite to the silica optical FBG. The absolute
value of the temperature response of POF Bragg grating is one order of magnitude
higher than that of the silica optical FBG, making POF Bragg grating appear to be
very attractive for constructing temperature sensors with high resolution.
© 2011 Chinese Optics Letters
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