Abstract: A waveguide comprising photonic crystal fibre terminated by a re-imaging device. The re-imaging device may, for example, be a length of multimode fibre. Connectors for such waveguides are also disclosed. A method of attaching a connector to a photonic crystal fibre is also disclosed. The method comprises terminating the photonic crystal fibre by splicing multimode fibre onto an end of the photonic crystal fibre to form a terminated photonic crystal fibre end, locating a ferrule on the terminated photonic crystal fibre such that there is a predetermined length of multimode fibre between the splice and the output end of the ferrule, and locating the ferrule within a connector body.