中国物理B ›› 2011, Vol. 20 ›› Issue (10): 104211-104211.doi: 10.1088/1674-1056/20/10/104211

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

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

李宏亮, 张巍, 黄翊东, 彭江得   

  1. State Key Laboratory on Integrated Opto-electronics, Electronic Engineering Department, Tsinghua University, Beijing 100084, China
  • 收稿日期:2011-01-25 修回日期:2011-05-05 出版日期:2011-10-15 发布日期:2011-10-15
  • 基金资助:
    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).

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

Li Hong-Liang(李宏亮)†, Zhang Wei(张巍), Huang Yi-Dong(黄翊东), and Peng Jiang-De(彭江得)   

  1. State Key Laboratory on Integrated Opto-electronics, Electronic Engineering Department, Tsinghua University, Beijing 100084, China
  • Received:2011-01-25 Revised:2011-05-05 Online:2011-10-15 Published:2011-10-15
  • Supported by:
    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).

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摘要： 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.

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.

Key words: Brillouin scattering, acoustic mode coupling, fibre sensing, optical fibre design

中图分类号: 

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