Patent ID: 8897644

Claim:
An optical line terminal comprising; a first optical receiver section to receive optical wavelength multiplexed signals as multiplexed optical signals from a plurality of optical network units (ONU); a bandwidth allocation control section to allocate the transmit bandwidth to each of the optical network units based on the bandwidth allocation request from the optical network unit included in the multiplexed optical signal received by way of the first optical receiver section; an optical transmitter section to transmit bandwidth allocation information including information on the transmit bandwidth allocated by the bandwidth allocation control section to the optical network unit, wherein the bandwidth allocation control section sets the transmit bandwidth to the optical network unit on the transmit wavelength that is a first wavelength, based on a bandwidth allocation request from the plurality of optical network units whose transmit wavelength is a first wavelength, and a bandwidth allocation request from the plurality of optical network units whose transmit wavelength is a second wavelength; and an optical amplifier section to amplify the optical wavelength multiplexed signal and output the amplified signal, wherein the bandwidth allocation control section allocates the transmit bandwidth to each of the optical network units at each bandwidth allocation period for each wavelength based on the optical power of the optical wavelength multiplexed signals received from each optical network unit that were input to the optical amplifier.