Communication method based on passive optical network, related device, and system

A communication method based on a passive optical network, comprising:

• receiving, by an optical network unit (ONU) of a plurality of ONUs of a passive optical network that comprises an optical line terminal (OLT) and the plurality of ONUs, a first downstream frame from the OLT using at least one downstream wavelength path, wherein the OLT and the ONU communicate with each other using the at least one downstream wavelength path and a plurality of upstream wavelength paths, wherein the first downstream frame comprises a first path identifier that identifies a first upstream wavelength path, wherein the first upstream wavelength path is one of the plurality of upstream wavelength paths, and selection of the first upstream wavelength path is independent of the at least one downstream wavelength path, and wherein the ONU is an activated ONU;
• determining, by the ONU, the first upstream wavelength path based on the first path identifier;
• and
• sending, by the ONU, upstream service data to the OLT using the first upstream wavelength path.

An optical network unit (ONU), comprising:

• a receiver, configured to receive a first downstream frame from an optical line terminal (OLT) using at least one downstream wavelength path, wherein the OLT and the ONU communicate with each other using the at least one downstream wavelength path and a plurality of upstream wavelength paths, wherein the ONU is an activated ONU, wherein the first downstream frame comprises a first path identifier identifying a first upstream wavelength path, and wherein the first upstream wavelength path is one of the plurality of upstream wavelength paths, and selection of the first upstream wavelength path is independent of the at least one downstream wavelength path;
• at least one processor;
• a non-transitory computer readable memory connected to the at least one processor and storing a program for execution by the at least one processor, the program including instructions to:
• determine the first upstream wavelength path based on the first path identifier;
• and
• a transmitter, configured to send upstream service data to the OLT using the first upstream wavelength path.

A passive optical network system, comprising:

• an optical line terminal (OLT);
• and
• a plurality of optical network units (ONUs), wherein the OLT and an activated ONU of the plurality of ONUs communicate with each other using at least one downstream wavelength path and a plurality of upstream wavelength paths;
• wherein the OLT comprises:
• a transmitter configured to send a first downstream frame to an activated ONU using at least one downstream wavelength path, wherein the OLT and the activated ONU communicate with each other using the at least one downstream wavelength path and the plurality of upstream wavelength paths, wherein the first downstream frame comprises a first path identifier identifying a first upstream wavelength path, and wherein the first upstream wavelength path is one of the plurality of upstream wavelength paths, and the first upstream wavelength path is selected by the OLT independently of the at least one downstream wavelength path;
• and
• a receiver configured to receive upstream service data from the activated ONU using the first upstream wavelength path;
• and
• wherein the activated ONU comprises:
• a receiver configured to receive the first downstream frame from the OLT using the at least one downstream wavelength path, wherein the OLT and the activated ONU communicate with each other using the at least one downstream wavelength path and the plurality of upstream wavelength paths;
• at least one processor;
• a non-transitory computer readable memory connected to the at least one processor and storing a program for execution by the at least one processor, the program including instructions to:
• determine the first upstream wavelength path based on the first path identifier;
• and
• a transmitter configured to send the upstream service data to the OLT using the first upstream wavelength path.