Patent ID: 8705969

Claim:
An optical backhaul network for a wireless broadband service, comprising: a plurality of optical network units (ONUs) outputting an uplink optical signal having a multiplexed wavelength; an optical line termination (OLT) outputting a downlink optical signal of a single mode in order to transmit the downlink optical signal to the ONUs in a broadcasting form; and a plurality of remote nodes (RNs) outputting a part of the downlink optical signal to the ONUs and for outputting the uplink optical signal to the OLT, wherein the OLT comprises: a seed optical module outputting a seed optical signal having a multiplexed wavelength; an optical transmitter transmitting the downlink optical signal of the single mode; an optical wavelength demultiplexer separating wavelengths of the uplink optical signal having different wavelengths; an optical receiver receiving the uplink optical signal having a separated wavelength; an optical filter coupling the seed optical signal and the downlink optical signal; and an optical circulator transferring the coupled seed optical signal and downlink optical signal to the RN and transferring the uplink optical signal to the optical wavelength demultiplexer.