Using pulses from the 30fs amplified laser system in the femtolabs, and fibre writing equipment from the Fibre Photonics lab, this project focusses on developing methods for inscription of Fibre Bragg Gratings (FBGs) through the polyimide fibre cover. Through the use of short focal length acylindrical optics, the laser spot-size on the cover is much larger than in the core. This along with the very short pulses allows us to work in a regime where we can still write strong gratings through multiphoton dielectric modification, without damaging the cover (through two photon absorption).