Distributed automatic power optimization system and method

A distributed Automatic Power Optimization (APO) system, applied to a wavelength division communication system, the distributed APO system comprising:

• one or more APO modules, wherein the one or more APO modules belong to one or more pre-divided APO links, each APO module in the one or more APO modules belongs to only one APO link, each APO module in one APO link is in one to one correspondence with every two adjacent stations in the APO link, and
• the APO module is configured to, when the APO link to which the APO module belongs is triggered to perform power regulation, regulate a power attenuation or a gain between the two adjacent stations corresponding to the APO module and report a regulation result;
• and
• a network management system, configured to, when learning that all of the one or more APO modules in one APO link are successful in regulation, if there is a next APO link of the APO link, trigger the next APO link of the APO link to perform power regulation;
• wherein the APO module comprises:
• an attenuation regulator, an APO controller and a power detector, wherein the attenuation regulator is configured to regulate optical signal power between the two adjacent stations corresponding to the APO module according to a set attenuation amount or gain value;
• the power detector is configured to, when input power of a receiving side of the two adjacent stations meets a first predetermined condition, trigger the APO controller to perform power query;
• and the APO controller is configured to, when being triggered to perform power query, query output power of a sending side of the two adjacent stations, and when a calculation result based on the input power and the output power meets a second predetermined condition, trigger a head node in the APO link to which the APO module belongs to initiate a regulation command, and regulate an attenuation amount or a gain value of the attenuation regulator according to the regulation command, wherein the head node refers to an APO controller of an APO module corresponding to first two adjacent stations, sequentially counted along a service direction, in one APO link.