Patent ID: 8542999
Filing Date: 2013-09-24
Classification: H04J,H04Q

Abstract:
1. A system that provisions a channel on which a client signal will be transmitted along a path from a source node through at least one intermediate node before reaching a destination node of a WDM optical network, the system comprising: (a) a signal channel transmitter that transmits a client signal among a plurality of nodes of the network on a signal channel having a predetermined frequency; (b) an optical filter at each node along the path that is configured to reflect the state of the signal channel at that node; and (c) a state table indicating, with respect to each node along the path, whether each of two channels adjacent to the signal channel is unused, (d) wherein the optical filter at each node along the path is configured by setting the state of each unused adjacent channel to the same physical state as that of the signal channel, thereby effectively increasing the spectral passband of the client signal.