Polarization dispersion adder and optical receiver
AssigneeNEC Corporation
InventorTakehiro Nakano
Life of this patent
Estimating the term…
Abstract
In order to provide a configuration for suppressing deterioration in the transmission quality of a signal light due to a nonlinear phenomenon in an optical fiber, a polarization dispersion adder is provided with: a polarization rotation unit which, with respect to each pulse of signal light generated by modulating a light carrier, rotates and outputs the polarization of the pulse during a period from a pulse rise start time (T0) to a pulse fall completion time (T1); and a delay addition unit which adds a delay of an amount corresponding to the rotation amount of the polarization added by the polarization rotation unit to the pulse outputted from the polarization rotation unit.
Claims18
A polarization dispersion adder comprising:
- a polarization rotator for continuously changing an angle of a polarization plane of a pulse for each pulse of signal light generated by modulating an optical carrier during a period from a rise start time T0 of the pulse to a fall completion time T1 of the pulse and outputting the pulse;
- and
- a delay adder for adding an amount of delay corresponding to a change amount of the polarization plane added by the polarization rotator to the pulse outputted from the polarization rotator.
An optical receiver comprising:
- a polarization beam splitter for polarization-splitting received signal light;
- an optical hybrid circuit for converting the polarization-split signal light into an analog electrical signal;
- an AD (analog to digital) converter for converting the analog electrical signal into a digital reception signal;
- and
- a polarization mode dispersion compensator for compensating for polarization mode dispersion that is included in the signal light and added at a time of transmission of the signal light;
- wherein the polarization mode dispersion compensator stores a parameter of the polarization mode dispersion added at the time of transmission of the signal light, and electrically compensates for the polarization mode dispersion included in the signal light based on the stored parameter.
A polarization dispersion addition method comprising:
- continuously changing, by a polarization rotator, an angle of a polarization plane of a pulse for each pulse of signal light generated by modulating an optical carrier during a period from a rise start time T0 of the pulse to a fall completion time T1 of the pulse;
- and
- adding an amount of delay corresponding to a change amount of the polarization plane added by the change to the pulse subjected to a rotation of the polarization.
Dependencies are inferred from the claim text.