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US 7,030,973 B2Granted
Polarization mode dispersion compensator based on degree of polarization
AssigneeFujitsu Limited
InventorsJens C. Rasmussen, George Ishikawa, Takafumi Terahara, Hiroki Ooi
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Abstract
The degree of polarization of an optical signal is measured by a polarimeter and used for providing a feedback signal to adjust adaptive optics of a polarization mode dispersion compensator. The polarization properties of the polarimeter are determined with high accuracy to match the polarimeter through calibration and used to produce the feedback signal.
Claims13
A polarization mode dispersion compensator, comprising:
- an optical unit receiving an input optical signal and outputting an output optical signal;
- a distortion analyzer having a polarimeter and producing a feedback signal;
- and
- a controller producing a control signal to adjust said optical unit, based on the feedback signal;
- and
- wherein said polarimeter having a plurality of optical components to measure intensity signals, the plurality of optical components are configured in such a way that a Poincaré sphere is fully covered by the intensity signals;
- and
- said distortion analyzer produces the feedback signal by calculating the intensity signals.
5 more elements
A distortion analyzers, comprising:
- a polarimeter which includes a plurality of optical components to produce a plurality of intensity signals from an input optical signal;
- and
- a processor producing a feedback signal, which represents degree of polarization of the input optical signal, for polarization mode dispersion compensation from the intensity signals;
- and
- wherein said polarimeter having a plurality of optical components to measure intensity signals, the plurality of optical components are configured in such a way that a Poincaré sphere is fully covered by the intensity signals;
- and
- and said distortion analyzer produces the feedback signal by calculating the intensity signals.
4 more elements
A method of polarization mode dispersion compensation, comprising:
- determining a polarization property of a polarimeter through calibration using a plurality of intensity signals output from a polarimeter;
- producing an output optical signal through an optical unit from an input optical signal;
- and producing a feedback signal;
- and
- adjusting said optical unit according to the feedback signal;
- wherein said polarimeter having a plurality of optical components to measure intensity signals, the plurality of optical components are configured in such a way that a Poincaré sphere is fully covered by the intensity signals;
- and
- and said distortion analyzer produces the feedback signal by calculating the intensity signals.
5 more elements
A polarization mode dispersion compensator, comprising:
- optical means for receiving an input optical signal and outputting an output optical signal;
- distortion analyzer having a polarimeter;
- and
- a controller for producing a control signal to adjust said optical unit, based on the feedback signal;
- wherein said polarimeter having a plurality of optical components to measure intensity signals, the plurality of optical components are configured in such a way that a Poincaré sphere is fully covered by the intensity signals;
- and
- and said distortion analyzer produces the feedback signal by calculating the intensity signals.
4 more elements
A distortion analyzer, comprising:
- polarimeter means which includes a plurality of optical means to produce a plurality of intensity signals from an input optical signal;
- and
- processor means for producing a feedback signal, which represents degree of polarization of the input optical signal, for polarization mode dispersion compensation from the intensity signals;
- wherein said polarimeter having a plurality of optical components to measure intensity signals, the plurality of optical components are configured in such a way that a Poincaré sphere is fully covered by the intensity signals;
- and
- and said distortion analyzer produces the feedback signal by calculating the intensity signals.
3 more elements
A polarization mode dispersion compensator, comprising:
- an optical unit receiving an input optical signal and outputting an output optical signal;
- a distortion analyzer which includes a polarimeter, analyzing the output optical signal and producing a feedback signal, which represents degree of polarization of the output optical signal, by using a polarization property of the polarimeter, the polarization property determined through calibration using a plurality of intensity signals output from the polarimeter;
- and
- a controller producing a control signal to adjust said optical unit, based on the feedback signal, and
- wherein said polarimeter includes a plurality of optical components forming four analyzers to produce four intensity signals;
- and the optical components are arranged such that equivalent analyzer polarizations of the four analyzers form a structure like atoms in a diamond on a Poincaré sphere.
3 more elements
Dependencies are inferred from the claim text.