Digital coherent receiver and skew adjustment method thereof
AssigneeNEC Corporation
InventorMasao MORIE
Life of this patent
Estimating the term…
Abstract
A skew adjustment method and a digital coherent receiver which can achieve skew adjustment without using a fixed pattern for skew detection are provided. A digital coherent receiver (100) includes: a chromatic dispersion adder (103) that adds chromatic dispersion to the optical multiplexed signal; a skew adjuster (201) that sets a quantity of skew adjustment for each of the plurality of channel signals obtained by detecting the optical multiplexed signal; and a skew controller (204) that is configured to, while monitoring signal quality of a reception signal obtained from the plurality of channel signals skew-adjusted, search for a quantity of skew adjustment at which the signal quality is made better.
Claims18
A digital coherent receiver for receiving an optical multiplexed signal, comprising:
- a chromatic dispersion adder that adds chromatic dispersion to the optical multiplexed signal to output a first optical multiplexed signal;
- a coherent detector that separates the first optical multiplexed signal into a plurality of channel signals by coherent detection;
- a skew adjuster that sets a quantity of skew adjustment for each of the plurality of channel signals to output a plurality of skew-adjusted channel signals;
- and
- a skew controller that is configured to, while monitoring reception signal quality obtained from the plurality of skew-adjusted channel signals, search for a quantity of skew adjustment at which the reception signal quality is made better.
A skew adjustment method in a digital coherent receiver for receiving an optical multiplexed signal, the method comprising:
- al by a chromatic dispersion adder, adding chromatic dispersion to the optical multiplexed signal to output a first optical multiplexed signal;
- b) by a coherent detector, separating the first optical multiplexed signal into a plurality of channel signals by coherent detection;
- by at least one processor,
- c) setting a quantity of skew adjustment for each of the plurality of channel signals to output a plurality of skew-adjusted channel signals;
- and
- d) while monitoring reception signal quality obtained from the plurality of skew-adjusted channel signals, searching for a quantity of skew adjustment at which the reception signal quality is made better.
A non-transitory computer-readable medium storing a program for causing a computer to function as a digital coherent receiver for receiving an optical multiplexed signal, the program comprising the steps of:
- a) by a chromatic dispersion adder, adding chromatic dispersion to the optical multiplexed signal to output a first optical multiplexed signal;
- b) by a coherent detector, separating the first optical multiplexed signal into a plurality of channel signals by coherent detection;
- c) by a skew adjuster, setting a quantity of skew adjustment for each of the plurality of channel signals to output a plurality of skew-adjusted channel signals;
- and
- d) by a skew controller, while monitoring reception signal quality obtained from the plurality of skew-adjusted channel, signals, searching for a quantity of skew adjustment at which the reception signal quality is made better.
Dependencies are inferred from the claim text.