Abstract

Selectively excited optical vector beams is utilized to experimentally demonstrate a highly sensitive strain sensor based on the phenomenon of intermodal interference caused between the LP₀₁ and the chosen LP₁₁ mode (TE₀₁ and HE₂₁). A few-mode fiber sensing configuration is simple, cheap, rugged, eliminates the need for a reference fiber and the problem of its temperature drift. These findings are new and such a selective-mode inter-modal sensing configuration (to the best of our knowledge) is not reported before.

© 2014 Japan Society of Applied Physics, Optical Society of America