Abstract
Few-mode fiber Bragg grating (FM-FBG) has wide applications in the field of
multi-wavelength fiber lasers and fiber-optic sensing. In this letter, FBG is successfully written
in a novel type of FM fiber (FMF) based on 248-nm excimer laser and a uniform phase mask. A low-loss
coupling between the FMF to a singlemode fiber is realized by a graded-index multi-mode fiber with a
length of about a quarter pitch. The sensing properties of the FMF grating are further investigated.
The experimental results indicate that the novel FM-FBG has sensitivities of temperature, strain,
and bending of 11.2 pm/°C, 1.3 pm/με, and 636.9 pm/m-1, respectively.
© 2013 Chinese Optics Letters
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