Optical Telecommunications Network

摘要

An optical telecommunication system includes a number of transparent passive optical networks (TONs). Each TON connects a group of terminals and the head end of each TON is connected to a common cen tral switching node. Each terminal includes means for selecting a wavelength/time channel for forming a connection with another terminal within the respective TON or within another TON. The central switching node comprises an optical spatial/wavelen gth switch arranged to provide switched connections betw een subscribers connected to different TONs.