Theoretical analysis of sensing character of long period fiber grating coated with gas-sensitive film

Yong Peng; Yizhuo Wang

doi:10.1117/12.666865

9 December 2005 Theoretical analysis of sensing character of long period fiber grating coated with gas-sensitive film

Yong Peng, Yizhuo Wang

Proceedings Volume 6024, ICO20: Optical Devices and Instruments; 60241K (2005) https://doi.org/10.1117/12.666865
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

Firstly we studied the sensitivity of long-period fiber gratings (LPFG) to the refractive index of ambient medium using the coupled modes theory. Then we presented numerical calculation based on long period fiber grating to show the relationship between the resonant wavelength of transmission spectrum and the ambient refractive index. Secondly we analyzed the optical mechanics of the semiconductor oxide film with gas-sensitivity and found that when touching the thin film gas can make its extinction coefficient, absorption coefficient and corresponding refractive index change. Thus we can coat the grating surface with gas-sensitive film and make use of the character that the refractive index will change with the component and density of ambient gas. Furthermore the change will influence the resonant wavelength of transmission spectrum of LPFG therefore we can get information about the gas component and density by way of monitoring changes of wavelength. The LPFG is more sensitive to ambient refractive index than fiber and the sensed signal is wavelength-modulated so the signal is not reflected by the fluctuation of light intensity and the fiber loss. Therefore the LPFG is more sensitive than intensity-type fiber gas sensor.

Citation Download Citation

Yong Peng and Yizhuo Wang "Theoretical analysis of sensing character of long period fiber grating coated with gas-sensitive film", Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 60241K (9 December 2005); https://doi.org/10.1117/12.666865

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KEYWORDS

Refractive index

Gas sensors

Fiber optics sensors

Absorption

Semiconductors

Cladding

Thin film coatings

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