Highly sensitive refractive index sensor based on adiabatically tapered microfiber long period gratings

Highly sensitive refractive index sensor based on adiabatically tapered microfiber long period gratings

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....

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Bibliographic Details
Main Authors: Ji, Wen Bin, Tjin, Swee Chuan, Lin, Bo, Ng, Choong Leng
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2013
Subjects:
DRNTU::Engineering
Online Access:https://hdl.handle.net/10356/99443
http://hdl.handle.net/10220/17583
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Institution: Nanyang Technological University
Language: English
Description
Summary: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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