Optical transmission system

摘要

An optical fibre cable, e.g. for a submarine transmission system incorporates a length of amplifying fibre 231 spliced into a transmission fibre 23a whereby to amplify transmitted signals. Optical pump power for the amplifying fibre is supplied from one end of the cable via a further fibre 232 and a coupler 24. In another embodiment, the pump power may be supplied along the transmission fibre.