Research on the NO gas-sensitive effect of long-period fiber gratings coated with film

Yong Peng; Min Sun

doi:10.1117/12.791057

12 March 2008 Research on the NO gas-sensitive effect of long-period fiber gratings coated with film

Yong Peng, Min Sun

Proceedings Volume 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing; 662406 (2008) https://doi.org/10.1117/12.791057
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

The spectral characteristics of long period fiber grating (LPFG) coated with sensitive film whose refractive index is higher than that of cladding is analyzed based on four-layer-step geometrical model both theoretically and experimentally. It is pointed out that the resonant wavelength of LPFG has a regular variation with the refractive indices of both ambience and the film besides film thickness. Blue shift appears due to the increase of film thickness. Optimal film thickness corresponding to the maximum values of both sensitivity and the change rate of resonant wavelength merely depends on ambient refractive index when the refractive index of the film is a constant. According to above theories, the new LPFG sensors sensitive to refractive index of chemical medium with higher sensitivities and wider range of application will be designed. Five LPFG sensors with different film thicknesses have been prepared by coating 2-6 layers SiO₂-WO₃ nanoscale multiforamen films on five claddings of LPFG respectively. When we put them in NO with 2% volume fraction, some changes happened only on the LPFG coated with three layers, whose resonant peak red shift 4.77nm, the loss change from -9.93db to -8.53db, the gas sensitivity, response time and recovery time also reached to 3%, 10s and 20s respectively.

Citation Download Citation

Yong Peng and Min Sun "Research on the NO gas-sensitive effect of long-period fiber gratings coated with film", Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 662406 (12 March 2008); https://doi.org/10.1117/12.791057

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KEYWORDS

Cladding

Refractive index

Sensors

Fiber coatings

Fiber couplers

Coating

Dielectrics

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