| 摘要 |
In a switching node of a wavelength multiplexed (WDM) communications system, a plurality of add-drop multiplexers ADMs , one per wavelength multiplex channel, are connected in parallel between an optical demultiplexer and multiplexer, each ADM providing an add/drop function on a different one of the WDM channels. One problem with the existing arrangement is that, if it is desired to switch some traffic from one optical channel to another it is necessary to provide additional optical switching functions. The present invention provides interconnection of the ADMs by means of their tributary ports. Hence messages and data from one of the WDM channels may be switched to any other one of the WDM channels via the tributary ports of the existing ADMs <IMAGE> |
