Title :
Studies on a few-mode fiber-optic strain sensor based on LP01 -LP02 mode interference
Author :
Kumar, Arun ; Goel, Nitin K. ; Varshney, R.K.
Author_Institution :
Dept. of Phys., Indian Inst. of Technol., New Delhi, India
fDate :
3/1/2001 12:00:00 AM
Abstract :
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 (δl2π) 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 δl2π 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
Keywords :
fibre optic sensors; light interference; light interferometry; optical fibre cladding; optical fibre theory; strain measurement; strain sensors; LP01-LP02 mode interference; LP01-LP02 modes; circularly symmetric few-mode fiber; core cladding index difference; differential phase shift; few-mode fiber-optic strain sensor; performance characteristics; sensing length; sensitivity; theoretical analysis; Arm; Capacitive sensors; Interference; Optical fiber polarization; Optical fiber sensors; Optical fiber theory; Performance analysis; Sensor phenomena and characterization; Splicing; Temperature sensors;
Journal_Title :
Lightwave Technology, Journal of
