多模光纤
材料科学
单模光纤
模式(计算机接口)
光学
拉伤
光纤
模式音量
光电子学
模耦合
包层(金属加工)
物理
计算机科学
医学
操作系统
内科学
作者
Saurabh Mani Tripathi,Arun Kumar,Ravi K. Varshney,Y.B.P. Kumar,Emmanuel Marin,Jean-Pierre Meunier
标识
DOI:10.1109/jlt.2008.2008820
摘要
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 GeO2-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 P2O5-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 ldquoqrdquo 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI