The group's principal activities are to design, develop, manufacture and distribute fibre optic components, modules and subsystems for the fiber optic communications industry. these products are deployed in advanced optical communications networks for the telecommunication and cable television industries. these fiber optic communications systems deliver video, audio and text data over fiber optic cables. the group also has optical technology business which incorporate optical technologies to control, enhance and modify the behavior of light utilizing its reflection, absorption and transmission properties to achieve specific effects such as reflectivity, anti-glare and spectral filtering. these products are used in semiconductor and biomedical industries. transmission & network components accounted for 70% of fiscal 2002 revenues, thin film products & instrumentation, 29%, & optical components, 1%.