Compact eccentric long period grating with improved sensitivity in low refractive index region

Fangcheng Shen, Kaiming Zhou, Neil Gordon, Lin Zhang, Xuewen Shu*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We demonstrate a compact eccentric long period grating with enhanced sensitivity in low refractive index region. With a period designed at 15 μm for coupling light to high order cladding modes, the grating is more sensitive to surrounding refractive index in low refractive index region. The intrinsically low coupling coefficients for those high order cladding modes are significantly improved with the eccentric localized inscription induced by the femtosecond laser. The fabricated grating is compact with a length of 4.05 mm, and exhibits an average sensitivity of ~505 nm/RIU in low refractive index region (1.3328-1.3544). The proposed principle can also work in other refractive index region with a proper choice of the resonant cladding modes.

Original languageEnglish
Pages (from-to)15729-15736
Number of pages8
JournalOptics Express
Volume25
Issue number14
Early online date26 Jun 2017
DOIs
Publication statusPublished - 10 Jul 2017

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