Polarization dispersion adder and optical receiver
AssigneeNEC Corporation
InventorTakehiro NAKANO
Life of this patent
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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.
Claims19
A polarization dispersion adder comprising:
- a polarization rotator for rotating polarization 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 rotation amount of the polarization 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.
A polarization dispersion addition method comprising:
- rotating polarization of a pulse for each pulse of signal light generated by modulating a 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 rotation amount of the polarization added by the rotation to the pulse subjected to the rotation of the polarization.
Dependencies are inferred from the claim text.