Abstract: A packaged optical device with an integrated optical component mounted within a housing which includes an end wall confronting a cheek of the component to which an optical fiber is to be connected to communicate with an internal structure of the component. The wall has an aperture in which is mounted an elongate rigid ferrule through which the optical fiber extends, so that the end faces of the fibre and ferrule are co-planar. After the ferrule has been manipulated externally of the housing to align the fibre with the component structure, the ferrule is secured in position by a UV setting adhesive. The end face of the ferrule may be adhered to the cheek of the component to maintain the alignment.