Tapered Graded Index Fibers For Sensing Applications

Optical sensors based on modal interference are improved by tapering a small extension of a graded-index fiber. The tapered section modulates the periodic amplitude of the propagated beam, substantially increasing the sensitivity of these devices. © 2013 Optical Society of America.Liu, Y., Wei, L., Low-cost high-sensitivity strain and temperature sensing using graded-index multimode fibers (2007) Appl. Opt., 46, pp. 2516-2519Biazoli, C.R., Silva, S., Franco, M.A.R., Frazão, O., Cordeiro, C.M.B., Multimode interference tapered fiber refractive index sensors (2012) Appl. Opt., 51, pp. 5941-5945Tripathi, S.M., Kumar, A., Varshney, R.K., Kumar, Y.P., Marin, E., Meunier, J.-P., Strain and temperature sensing characteristics of single-mode-multimode-single-mode structures (2009) J. Lightwave Technol., 27, pp. 2348-2356Tripathi, S.M., Kumar, A., Marin, E., Meunier, J.-P., Single-multi-single mode structure based band pass/stop fiber optic filter with tunable bandwidth (2010) J. Lightwave Technol., 28, pp. 3535-3541Safaai-jazi, A., Propagation properties of tapered graded-index waveguides (1996) J. Mod. Opt., 43, pp. 1921-193