SCM-PON using WDM

A Sub-Carrier Multiplexing (SCM)-Passive Optical Network (PON) using Wavelength Division Multiplexing (WDM), comprising:

• an Optical Line Terminal (OLT) for transferring downstream data from an external service provider through downstream optical signals and transferring upstream data transferred through upstream optical signals to an outside;
• an Optical Distribution Network (ODN) for distributing the downstream optical signals from the OLT and multiplexing the upstream optical signals to the OLT;
• and
• a plurality of Optical Network Units (ONUs) for processing the downstream optical signals transferred from the OLT through the ODN and transferring upstream data of subscribers for the OLT through the upstream optical signals,
• wherein the optical signals between the OLT and the ONUs are divided into wavelength channels with different wavelengths and sub-carrier channels obtained by time-dividing the wavelength channels so that the upstream data and the downstream data are transferred through the sub-carrier channels.