Patent ID: 8494366

Claim:
A wavelength division multiplexing-passive optical network (WDM-PON) comprising: an optical line termination (OLT) unit which is located in a base station, transmits downstream optical signals to a subscriber side, and receives upstream optical signals transmitted from the subscriber side; an optical network unit (ONU) unit which is located at the subscriber side, receives the downstream optical signals from the OLT unit, and transmits the upstream optical signals to the OLT unit; a seed light source module which is located in the base station and separated from the OLT, and includes a downstream seed light source module that provides spectrum-sliced and wavelength-multiplexed seed light to the OLT unit, and an upstream seed light source module that provides spectrum-sliced and wavelength-multiplexed seed light to the ONU unit; a remote node (RN) which wavelength-divides the downstream optical signals transmitted from the OLT unit so as to output the wavelength-divided downstream optical signals to the ONU unit, and wavelength-multiplexes the upstream optical signals transmitted from the ONU unit so as to output the wavelength-multiplexed upstream optical signals to the OLT unit; and a wavelength conversion device which is located at the subscriber side, wavelength-converts the downstream optical signals to have time division multiple access-passive optical network (TDMA-PON) downstream wavelengths, and outputs the wavelength-converted downstream optical signals to the ONU unit, wherein optical transmitters of the OLT unit and the ONU unit respectively generate the downstream and upstream optical signals by using the seed light.