Vector displacement sensor based on femtosecond laser direct writing gratings and waveguides in a seven-core fiber

Abstract

A novel vector displacement sensor based on femtosecond laser direct writing gratings and waveguides in a seven-core fiber was proposed. Avoiding the use of fan-in & fan-out devices, such a vector displacement sensor realized a highly integrated structure. The displacement sensitivity, displacement resolution and directional accuracy of the proposed sensor were 0.28 nm/mm, 0.01 mm, and < 0.1°, respectively.