Communication apparatus and communication method
AssigneeNTT, Inc.
InventorsSang-Yuep Kim, Junichi Kani
Life of this patent
Estimating the term…
Abstract
The communication device includes: a reception unit that receives burst frame signals from a plurality of other communication devices respectively; and a control unit that changes a block length of a moving average filter in carrier phase synchronization so as to minimize a phase noise amount of the burst frame signals.
Claims8
A communication device of a time division multiplexing passive optical network that includes the communication device and a plurality of communication devices, the communication device being an optical line termination device, the plurality of communication devices being optical network units, each having a different laser light source and each generating a burst frame signal by multilevel-modulating laser light output from the laser light source in wavelength synchronization with local oscillation light output from a local oscillation light source of the communication device, the communication device comprising:
- a receiver that coherently receives the burst frame signal respectively transmitted from the plurality of communication devices by using the local oscillation light source;
- a measurer that measures a phase noise amount from a preamble of the received burst frame signal or from the burst frame signal when a discovery operation is executed;
- and
- a controller that changes a block length of a moving average filter in carrier phase synchronization of a coherent receiver so as to minimize a phase noise amount of the burst frame signals for each received burst frame signal or for each execution period of the discovery operation.
A communication method used by a communication device of a time division multiplexing passive optical network that includes the communication device and a plurality of communication devices, the communication device being an optical line termination device, the plurality of communication devices being optical network units each having a different laser light source and each generating a burst frame signal by multilevel-modulating laser light output from the laser light source in wavelength synchronization with local oscillation light output from a local oscillation light source of the communication device, the communication method comprising:
- coherently receiving the burst frame signal respectively transmitted from the plurality of communication devices by using the local oscillation light source;
- measuring a phase noise amount from a preamble of the received burst frame signal or from the burst frame signal when a discovery operation is executed;
- and
- changing a block length of a moving average filter in carrier phase synchronization of a coherent receiver so as to minimize a phase noise amount of the burst frame signals for each received burst frame signal or for each execution period of the discovery operation.
Dependencies are inferred from the claim text.