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Studies on a few-mode fiber-optic strain sensor based on LP01 -LP02 mode interference

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3 Author(s)
Kumar, A. ; Dept. of Phys., Indian Inst. of Technol., New Delhi, India ; Goel, N.K. ; Varshney, R.K.

We studied a fiber-optic strain sensor based on interference between LP01-LP02 modes of a circularly symmetric few-mode fiber (FMF). A simple theoretical analysis for predicting the performance characteristics of such a sensor is developed. Fiber elongations producing differential phase shift of 2π (δl) between the two modes are measured, which is found to be independent of sensing length of the fiber as predicted by theory. A good agreement between the experimental and theoretical values of δl is observed. Theoretical calculations predict that the sensitivity of such a sensor is maximum for fibers with V=4.82 and increases with the increase in the core cladding index difference Δn

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Lightwave Technology, Journal of  (Volume:19 ,  Issue: 3 )