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2017•Microwave and Optical Technology LettersRequires access

Dependance of ambient refractive index sensitivity with grating period of LPFG

Derick Engles, Shivendu Prashar, Sham S. Malik

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Abstract

ABSTRACT This study investigates the response of long period fiber grating (LPFG) to ambient index smaller than fiber cladding index at different grating periods. Here the basis of investigation is difference in resonant wavelength shifts of different ambient indices surrounding optical fiber cladding with periods. Mathematical approach using three layer geometry is implemented on standard fiber (SMF28e) to estimate cladding modes. The influence of grating periods (375 μm, 415 μm, 450 μm, 500 μm, and 550 μm) on LPFG index sensitivity is assessed for LP03, LP04, LP05, and LP06 cladding modes. The largest shift of 127 nm for a range of ambient refractive index (1–1.455) is achieved by LP06 mode at a grating period of 550 μm. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:658–661, 2017

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ABSTRACT This study investigates the response of long period fiber grating (LPFG) to ambient index smaller than fiber cladding index at different grating periods. Here the basis of investigation is difference in resonant wavelength shifts of different ambient indices surrounding optical fiber cladding with periods. Mathematical approach using three layer geometry is implemented on standard fiber (SMF28e) to estimate cladding modes. The influence of grating periods (375 μm, 415 μm, 450 μm, 500 μm, and 550 μm) on LPFG index sensitivity is assessed for LP03, LP04, LP05, and LP06 cladding modes. The largest shift of 127 nm for a range of ambient refractive index (1–1.455) is achieved by LP06 mode at a grating period of 550 μm. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:658–661, 2017

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Available abstract

ABSTRACT This study investigates the response of long period fiber grating (LPFG) to ambient index smaller than fiber cladding index at different grating periods. Here the basis of investigation is difference in resonant wavelength shifts of different ambient indices surrounding optical fiber cladding with periods. Mathematical approach using three layer geometry is implemented on standard fiber (SMF28e) to estimate cladding modes. The influence of grating periods (375 μm, 415 μm, 450 μm, 500 μm, and 550 μm) on LPFG index sensitivity is assessed for LP03, LP04, LP05, and LP06 cladding modes. The largest shift of 127 nm for a range of ambient refractive index (1–1.455) is achieved by LP06 mode at a grating period of 550 μm. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:658–661, 2017

Key concepts: Long-period fiber grating, Cladding mode, Cladding (metalworking), Optics, Refractive index, Grating, Materials science, Normalized frequency (unit)

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