High Reliability (hi-rel) fused components are deployed in undersea, avionic, and space, environments where the costs of component replacement are prohibitive. G&H is established as a supplier of these components to major undersea equipment manufacturers. G&H’s hi-rel capability is built upon a long established history of manufacturing terrestrial components. Facilities are available to conduct customer-specific qualification programmes. Manufacturing is carried out on specially developed workstations where advanced fibre management, in-process screening and customer-specific validation tests are implemented. Component types available include fused fibre couplers, tap couplers and wavelength division multiplexers. The ultra-low loss of G&H fused fibre components helps to promote low noise figure and improved system margin in undersea transmission systems. Components are supplied in regular (bare fibre), semi-ruggedised (900um sleeving) or custom housings, depending on the installation environment.