Highly sensitive refractive index sensor based on adiabatically tapered microfiber long period gratings
Ji, Wen Bin
Tjin, Swee Chuan
Ng, Choong Leng
Date of Issue2013
School of Electrical and Electronic Engineering
Photonics Research Centre
Institute for Infocomm Research, A*STAR
We demonstrate a refractive index sensor based on long period grating (LPG) inscribed in a special photosensitive microfiber with double-clad profile. The fiber is tapered gradual enough to ensure the adiabaticity of the fiber taper. In other words, the resulting insertion loss is sufficient small. The Boron and Germanium co-doped inner cladding makes it suitable for inscribing gratings into its tapered form. The manner of wavelength shift for refractive indices (RI) differs from conventional LPG. The detection limit for refractive index is 1.67 × 10−5.
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