Estimating optical transmission system penalties induced by polarization mode dispersion (PMD)
AssigneeAT&T Corp.
InventorsMikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
Life of this patent
Estimating the term…
Abstract
Polarization mode dispersion (PMD) induced system penalty ε is determined from optical characteristics of an optical wavelength division multiplexed (WDM) signal that is carried on a network. The method involves tapping the optical WDM signal, separating an optical channel from the tapped optical WDM signal, performing a frequency-resolved state of polarization (SOP) measurement on the channel, and computing the PMD-induced system penalty as ε=AL2+BL4, in which A and B are predetermined parameters and L is an SOP string length based on the SOP measurement.
Claims20
A method for determining a polarization mode dispersion (PMD) induced system penalty ε from the optical characteristics of an optical wavelength division multiplexed (WDM) signal carried on a network, the method comprising:
- tapping the optical WDM signal;
- separating an optical channel signal from the tapped optical WDM signal;
- performing a frequency-resolved state of polarization (SOP) measurement on the channel;
- computing the PMD-induced system penalty as ε=AL2+BL4;
- wherein:
- A and B are predetermined parameters;
- and
- L is an SOP string length based on the SOP measurement;
- and
- outputting the PMD-induced system penalty ε to an application.
A computer-usable medium having computer readable instructions stored thereon for execution by a processor to perform a method for determining a polarization mode dispersion (PMD) induced system penalty ε from the optical characteristics of an optical wavelength division multiplexed (WDM) signal carried on a network, the method comprising:
- tapping the optical WDM signal;
- separating an optical channel signal from the tapped optical WDM signal;
- performing a frequency-resolved state of polarization (SOP) measurement on the channel;
- computing the PMD-induced system penalty as ε=AL2+BL4;
- wherein:
- A and B are predetermined parameters;
- and
- L is an SOP string length based on the SOP measurement;
- and
- outputting the PMD-induced system penalty ε to an application.
A system for determining whether network errors are due to polarization mode dispersion (PMD) using a PMD induced system penalty εdetermined from the optical characteristics of an optical wavelength division multiplexed (WDM) signal carried on a network, the system comprising:
- an optical WDM signal tap;
- means for separating an optical channel signal from the tapped optical WDM signal;
- means for performing a frequency-resolved state of polarization (SOP) measurement on the channel;
- means for computing the PMD-induced system penalty as ε=AL2+BL4;
- wherein:
- A and B are predetermined parameters;
- and
- L is an SOP string length based on the SOP measurement;
- and
- wherein the PMD-induced system penalty ε is used for determining whether network errors are due to PMD.
Dependencies are inferred from the claim text.