Methods and systems for polarization mode dispersion compensation
AssigneeAT&T Corp.
InventorsAntonio Mecozzi, Jonathan A. Nagel, Mark Shtaif, Moshe Tur
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Abstract
Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, a simplified model of a higher-order PMD compensator can be derived. The model can be used produce an economical compensator by making multiple uses of selected optical components.
Claims2
An optical device that compensates for polarization mode dispersion (PMD) of an optical signal, comprising:
- a first rotating device that rotates the polarization angle of the optical signal in a frequency-dependent manner;
- a first order PMD compensator that receives the rotated signal and compensates for first-order PMD;
- and
- a second rotating device that receives the compensated signal and rotates the polarization angle of the compensated signal in a frequency-dependent manner to compensate for higher order PMD, wherein passing the optical signal through the first rotation device in a forward direction causes a first transformation R(ωK) of the optical signal and passing the optical signal in a backward direction causes a second transformation R−1(ωK), wherein ω denotes the deviation from a central angular frequency of the optical signal and K relates to a variable delay.
A method for compensating for polarization mode dispersion (PMD) of an optical signal, comprising:
- first rotating a first polarization angle of the optical signal in a frequency-independent manner to generate an intermediate optical signal;
- and
- second rotating a second polarization angle of the intermediate optical signal in a frequency-dependent manner to compensate for higher order PMD, wherein the first rotating and second rotating are performed by a single polarization rotation device.
Dependencies are inferred from the claim text.