Abstract

An in-fiber optical waveguide based Mach-Zehnder interferometer, fabricated by direct femtosecond laser is demonstrated. The waveguide takes light from the fiber core, guide it along the cladding and then sending it back to the fiber core, thus forming a Mach-Zehnder interferometer. The device is compact and robust, can be constructed in a flexible and precisely controlled manner, and can be used for strain and temperature sensing.

© 2018 The Author(s)