Optical fiber refractometer based on cladding-mode Bragg grating

Ming Han, Fawen Guo, Yongfeng Lu

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Abstract

We demonstrate an optical fiber refractometer based on a cladding-mode Bragg grating. It consists of a longperiod grating (LPG) followed by a fiber Bragg grating (FBG). The LPG partially couples light from the core mode to a cladding mode, both of which are reflected by the FBG. Part of the cladding mode reflection is coupled back to the core mode through the original LPG and used for refractive index sensing. The core mode reflection is used to compensate for the temperature cross sensitivity of the refractometer. The sensors operate in the reflection mode and can be multiplexed on a fiber in wavelength domain.

Original languageEnglish (US)
Pages (from-to)399-401
Number of pages3
JournalOptics Letters
Volume35
Issue number3
DOIs
Publication statusPublished - Feb 1 2010

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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