Acoustic longitudinal mode coupling in w-shaped Al/Ge Co-doped fibre

doi:10.1088/1674-1056/20/10/104211

Abstract This paper proposes a novel fibre structure aiming at distributed temperature and strain sensing. Utilizing Al₂O₃ and GeO₂ as dopants to form a w-shaped acoustic waveguide, it realizes modal coupling between longitudinal acoustic modes of its inner and outer core layers, leading to a dual-peak or multi-peak Brillouin gain spectrum. The relationship between the acoustic mode coupling properties and the fibre materials, doping concentrations and structural parameters are investigated, showing that the positions of mode coupling points in acoustic dispersion curves and the coupling intensities can be designed flexibly. A specific fibre design for the discriminative sensing of temperature and strain under a pump wavelength of 1.55 μm is given. The responses of its Brillouin gain properties on temperature and strain are analysed theoretically, demonstrating its potential for distributed fibre Brillouin sensing.

Keywords: Brillouin scattering acoustic mode coupling fibre sensing optical fibre design

Received: 25 January 2011
Revised: 05 May 2011
Accepted manuscript online:

PACS:	42.82.-i
	42.65.Es	(Stimulated Brillouin and Rayleigh scattering)
	46.40.-f	(Vibrations and mechanical waves)
	42.81.Pa	(Sensors, gyros)

Fund: Project supported in part by the National Natural Science Foundation of China (Grant No. 60777032), 973 Program of China (Grant No. 2010CB327600), and the Science Foundation of Beijing (Grant No. 4102028).

Cite this article:

Li Hong-Liang(李宏亮), Zhang Wei(张巍), Huang Yi-Dong(黄翊东), and Peng Jiang-De(彭江得) Acoustic longitudinal mode coupling in w-shaped Al/Ge Co-doped fibre 2011 Chin. Phys. B 20 104211

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Acoustic longitudinal mode coupling in w-shaped Al/Ge Co-doped fibre

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