PON with active adaption of optical distribution network

A system for managing traffic flow in a passive optical network, PON, comprising an optical line terminal, OLT, connected to a plurality of optical network units, ONUs, via an optical distribution network, ODN, having a distributive element, the system comprising:

• a system control means located at the OLT;
• and
• a distribution control means located at the distributive element,
• the distributive element having a first port associated with signal transmission between the OLT and the ODN via a first optical link and a plurality of second ports each associated with signal transmission between the ODN and a respective ONU or a respective group of ONUs via a respective second optical link,
• wherein each of the second ports of the distributive element is associated with a respective power distribution ratio of optical power at that second port to optical power at the first port of the distributive element, and
• wherein the system control means comprises:
• a PON control unit configured to:
• obtain one or more optimization parameters for a target state of the PON;
• and
• determine, for one or more or each of the ONUs, a respective modulation scheme for communicating data between the OLT and that ONU via the first optical link and the respective second optical link;
• and
• an ODN control unit configured to:
• obtain the determined modulation scheme from the PON control unit;
• and
• determine the respective power distribution ratio for one or more of the ONUs based on the determined modulation schemes and the one or more optimization parameters, and
• wherein the distribution control means is configured to:
• adjust a respective branch power for the one or more of the ONUs based on the determined power distribution ratio for communicating data between the OLT and the one or more of the ONUs.

An optical line terminal, OLT, for data communication with a plurality of optical network units, ONUs, in a passive optical network, PON, via an optical distribution network, ODN, the OLT comprising:

• a control interface configured to obtain one or more optimization parameters for a target state of the PON;
• a PON control unit configured to determine one or more modulation schemes for communicating optical data between the OLT and one or more of the ONUs;
• and
• an ODN control unit configured to:
• obtain the determined one or more modulation schemes from the PON control unit;
• and
• determine, based on the determined one or more modulation schemes and the one or more optimization parameters, a respective power distribution ratio for the ODN for communicating the optical data with the one or more of the ONUs.

A distributive element for an optical distribution network, ODN, for data communication between an optical line terminal, OLT, and a plurality of optical network units, ONUs, in a passive optical network, PON, the distributive element comprising:

• a first port associated with signal transmission between the OLT and the ODN via a first optical link;
• a plurality of second ports each associated with signal transmission between the ODN and a respective ONU or a respective group of ONUs within the PON via a respective second optical link;
• and
• a distribution control means configured to:
• obtain, from the OLT, a respective power distribution ratio for each of the second ports, wherein the respective power distribution ratio is based on one or more optimization parameters for a target state of the PON obtained at the OLT and modulation schemes determined at the OLT for communicating data between the OLT and the respective ONU via the first optical link and the respective second optical link;
• and
• adjust a respective branch power for one or more of the ONUs based on the obtained respective power distribution ratio for communicating data between the OLT and the one or more of the ONUs.