Submerged optical multiplexing techniques for future transmission networks

Optical fibre transmission systems requirements are becoming more demanding, requiring increased capacity and routing flexibility. Developments in passive optical device technology have reached the stage where commercial devices are becoming available. These new devices provide the opportunity to realise this flexibility and therefore the optimum schemes for their incorporation are now being addressed. Two such possibilities are presented: a controlled remote, passive optical time division multiplex system and a four channel wavelength division multiplexed system. Particular attention is given to demonstrating realistic practical systems, as is shown by the emphasis on control and use of commercially available components