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

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【作者】 李宏亮张巍黄翊东彭江得

【Author】 Li Hong-Liang , Zhang Wei, Huang Yi-Dong, and Peng Jiang-De State Key Laboratory on Integrated Opto-electronics, Electronic Engineering Department, Tsinghua University, Beijing 100084, China

【机构】 State Key Laboratory on Integrated Opto-electronics, Electronic Engineering Department, Tsinghua University

【摘要】 This paper proposes a novel fibre structure aiming at distributed temperature and strain sensing. Utilizing Al 2 O 3 and GeO 2 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.

【Abstract】 This paper proposes a novel fibre structure aiming at distributed temperature and strain sensing. Utilizing Al 2 O 3 and GeO 2 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.

【基金】 supported in part by the National Natural Science Foundation of China (Grant No. 60777032);973 Program of China(Grant No. 2010CB327600);the Science Foundation of Beijing (Grant No. 4102028)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2011年10期
  • 【分类号】TN253
  • 【被引频次】5
  • 【下载频次】33
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