Characterisation of a double tilted fiber Bragg grating using an electrowetting platform

We report a method of characterization and modification of the optical transmission properties of a double tilted Bragg grating structure by using a micro droplet translated on an electrowetting-on-dielectric platform. The droplet makes contact with the fiber cladding in the zone between the two gratings in the fiber. The change in optical transmission spectrum with droplet position was experimentally measured, and results are presented and discussed.