Abstract
A method to fabricate fiber Bragg grating (FBG) in an optical microfiber (OM) from a
conventional photosensitive fiber is proposed in this letter. The cladding of a conventional
photosensitive fiber is etched to 17 μm. The etched fiber is drawn to an OM 6 μm in diameter. The
photosensitivity of the fabricated OM is effectively reserved. A FBG in the OM (MFBG) is
successfully fabricated using a KrF excimer laser at a fluence of 400 mJ/cm2 through a phase mask
with a pitch of 1 089.3 nm. The reflectivity of the FBG is approximately 10%, and the 3-dB spectrum
bandwidth is 0.13 nm. The concentration of brine is measured by immersing the MFBG in the liquid,
and the minimum detectable refractive index variation can reach 7.2 × 10<sup>-5</sup> at a refractive
index value of 1.33.
© 2013 Chinese Optics Letters
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