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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 13 — Jul. 1, 2009
  • pp: 2348–2356

Strain and Temperature Sensing Characteristics of Single-Mode–Multimode–Single-Mode Structures

Saurabh Mani Tripathi, Arun Kumar, Ravi K. Varshney, Y. Bala Pavan Kumar, Emmanuel Marin, and Jean-Pierre Meunier

Journal of Lightwave Technology, Vol. 27, Issue 13, pp. 2348-2356 (2009)


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Abstract

We present a comprehensive study of the strain and temperature-sensing characteristics of single-mode–multimode–single-mode (SMS) structures based on the modal interference of guided modes of graded index multimode fiber (MMF) section spliced in between two single-mode fibers. A detailed theoretical study of the structures in terms of the refractive index distribution, effect of dopant and their concentrations, and the variation of core diameter has been carried out. Our study shows that for the SMS structure with a ${\rm GeO}_{2}$-doped MMF there exists a critical wavelength on either side of which the spectrum shows opposite spectral shift with a change in temperature/strain, whereas for structures with a ${\rm P}_{2}{\rm O}_{5}$-doped MMF it shows monotonic red shift with increasing temperature/strain. It has been found that the critical wavelength shifts toward higher wavelengths with decreasing “$q$” value/doping concentration. Using different MMFs, both the red and blue spectral shifts have been observed experimentally. It has also been found that the SMS structure has higher sensitivity toward this critical wavelength. The study should find application in designing strain-insensitive high-sensitive temperature sensors or vice versa.

© 2009 IEEE

Citation
Saurabh Mani Tripathi, Arun Kumar, Ravi K. Varshney, Y. Bala Pavan Kumar, Emmanuel Marin, and Jean-Pierre Meunier, "Strain and Temperature Sensing Characteristics of Single-Mode–Multimode–Single-Mode Structures," J. Lightwave Technol. 27, 2348-2356 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-13-2348


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