Patent ID: 9621261
Date: 2017-04-11
CPC Classifications: H04B,H04J

Claim:
1. Method for channel set up in an optical WDM-network transmitting a Wavelength Division Multiplex (WDM)-signal via optical channels, comprising the steps of configuring a signal path between a start node, via at least one intermediate node, and a last node for an optical channel signal transmitted in an optical channel of the WDM-signal, on-off modulating at the start node said optical channel signal with a modulation test signal generating a channel test signal, transmitting said channel test signal via said optical channel of the WDM-signal, tapping at a downstream monitoring port an electrical measurement signal derived from the WDM-signal, deriving a power level of said channel test signal by applying a correlation method between the electrical measurement signal and a correlation signal corresponding to said modulation test signal during a predefined time period, calculating a control command from the difference between a measured power level and a target power value allocated to said optical channel signal at a certain power monitoring point, setting an output power level of said optical channel signal in the start node according to the control command to obtain the allocated target power value, and setting the output power level of the channel signal in further nodes located downstream from said start node within said signal path to obtain further allocated target power values at further power monitoring points located downstream from said start node within said signal path.