The inner cladding mode in a photonic crystal fiber for temperature- and refractive index-independent strain sensing applications

Chengkun Chen; Albane Laronche; Géraud Bouwmans; Laurent Bigot; Yves Quiquempois; Jacques Albert

doi:10.1117/12.786115

16 May 2008 The inner cladding mode in a photonic crystal fiber for temperature- and refractive index-independent strain sensing applications

Chengkun Chen, Albane Laronche, Géraud Bouwmans, Laurent Bigot, Yves Quiquempois, Jacques Albert

Author Affiliations +

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70046B (2008) https://doi.org/10.1117/12.786115
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

Fiber Bragg gratings with strong resonance peaks for both Bragg and cladding modes are made in photonic crystal fiber modified with a germanium doped core. Experimental results for strain, temperature and refractive index sensitivities of fiber Bragg gratings are reported. We show the existence of an inner cladding mode that has the largest coupling from the core mode and that is insensitive to surrounding index changes. The core mode, inner cladding mode and outer cladding modes all have the same temperature sensitivity. By tracking the cladding mode resonances shifts relative to the core mode, a temperature and index insensitive strain sensor can be made.

Citation Download Citation

Chengkun Chen, Albane Laronche, Géraud Bouwmans, Laurent Bigot, Yves Quiquempois, and Jacques Albert "The inner cladding mode in a photonic crystal fiber for temperature- and refractive index-independent strain sensing applications", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70046B (16 May 2008); https://doi.org/10.1117/12.786115

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