Data transmission method, related apparatus, and system

A method implemented by an optical network unit (ONU), wherein the method comprises:

• generating uplink burst data comprising a synchronization data block and a payload, wherein the synchronization data block comprises first synchronization data and second synchronization data, wherein the first synchronization data comprises a first preamble and a first delimiter, and wherein the second synchronization data comprises a second preamble and a second delimiter;
• and
• sending, to an optical line terminal (OLT), the uplink burst data.

An optical network unit (ONU) comprising:

• a processor configured to generate uplink burst data comprising a synchronization data block and a payload, wherein the synchronization data block comprises first synchronization data and second synchronization data, wherein the first synchronization data comprises a first preamble and a first delimiter, and wherein the second synchronization data comprises a second preamble and a second delimiter;
• and
• a transmitter coupled to the processor and configured to send, to an optical line terminal (OLT), the uplink burst data.