Systems and methods for correcting downstream power excursions during upstream loading operations in optical networks

A network element, comprising:

• a first flexible ROADM module comprising:
• a first system port;
• a second system port;
• a first line port optically coupled to a first optical fiber link carrying a first optical signal having a first group of passbands;
• a first processor;
• and
• a first memory comprising a non-transitory processor-readable medium storing a first orchestrator application having one or more first service component, and storing first processor-executable instructions;
• a second flexible ROADM module comprising:
• a third system port;
• a fourth system port;
• a second line port optically coupled to the first line port of the first flexible ROADM module;
• a second processor;
• and
• a second memory comprising a non-transitory processor-readable medium storing a second orchestrator application having one or more second service component, and storing second processor-executable instructions;
• a third flexible ROADM module comprising:
• a fifth system port;
• a sixth system port;
• a third line port optically coupled to the first line port of the first flexible ROADM module;
• a third processor;
• and
• a third memory comprising a non-transitory processor-readable medium storing a third orchestrator application having one or more third service component, and storing third processor executable instructions;
• wherein the second processor-executable instructions, when executed by the second processor, cause the second processor to:
• responsive to receiving a first signal indicative of an impending network state change, pause all power adjustments by a second control block on the second flexible ROADM module and save at least one first power set point value for each active passband from the first group of passbands from the first flexible ROADM module, the network state change being responsive to service activation or service deactivation affecting the first optical signal;
• and
• responsive to receiving a second signal indicative of the network state change, adjust an optical power of each active passband from the first optical signal using the first power set point values;
• and
• wherein the third processor-executable instructions, when executed by the third processor cause the third processor to:
• responsive to receiving the first signal indicative of the impending network state change, pause all power adjustments by a third control block on the third flexible ROADM module and save at least one second power set point value for each active passband from the first group of passbands from the first flexible ROADM module, the network state change being responsive to service activation or service deactivation affecting the first optical signal;
• and
• responsive to receiving the second signal indicative of the network state change, adjust an optical power of each active passband from the first optical signal using the second power set point values.

An optical transport network, comprising:

• a first network element comprising a first processor, a first wavelength selective switch having a first line port and a first system port, and a first memory comprising a non-transitory processor-readable medium storing a first orchestrator application having at least one first service component, and first processor-executable instructions;
• a second network element comprising a second processor, a second wavelength selective switch having a second line port and a second system port and exposing a control block, and a second memory comprising a non-transitory processor-readable medium storing a second orchestrator application having at least one second service component, and second processor-executable instructions;
• and
• an optical fiber link optically coupled to the first line port and the second line port, the optical fiber link operable to carry an optical signal having the optical service in a plurality of passbands;
• wherein the first processor executable instructions, when executed by the first processor, cause the first processor to generate a first signal and transmit the first signal via the first line port to the second network element, the first signal indicative of an impending state change on the first network element;
• responsive to receiving the first signal, the second processor executable instructions cause the second processor to pause all power adjustments by the control block and save at least one power set point value for each active passband in the optical signal;
• responsive to saving at least one power set point for each active passband in the optical signal, the second processor executable instructions cause the second processor to generate a second signal and transmit the second signal to the first network element via the second line port, the second signal indicating that the second network element is prepared for the state change;
• responsive to receiving the second signal, the first processor executable instructions cause the first network element to perform the state change;
• responsive to completing the state change, the first processor executable instructions cause the first processor to generate a third signal and transmit the third signal to the second network element via the first line port, the third signal indicating that the state change is complete;
• responsive to receiving the third signal, the second processor executable instructions cause the second processor to adjust an optical power of each active passband in the optical signal using the power set point values.