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US 8,897,644 B2Granted
Optical line terminal and optical network system
AssigneeHitachi, Ltd.
InventorsJun Sugawa, Daisuke Mashimo, Hiroki Ikeda
Life of this patent
Estimating the term…
Abstract
Technology to provide linked control of bandwidth allocation to a plurality of optical network units among the plural wavelengths by a bandwidth allocation section coupled to the plural optical network units.
Claims13
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.
4 more elements
An optical network system comprising:
- a plurality of optical network units;
- and
- an optical line terminal coupled by way of an optical splitter and a wavelength division multiplexing coupler to the optical network units,
- wherein the optical network units includes:
- an optical receiver section to receive bandwidth allocation information sent from the optical line terminal;
- and
- an optical transmitter section to send optical signals based on bandwidth allocation information received from the optical receiver section,
- wherein the optical line terminal includes:
- a first optical receiver section to receive optical wavelength multiplexed signal that are multiplexed optical signals from a plurality of optical network units;
- 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;
- a transmit section to transmit bandwidth allocation information including information on the transmit bandwidth allocated by the bandwidth allocation control section to the optical network unit, and
- 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 transmit 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.
12 more elements
Dependencies are inferred from the claim text.