Method for optical transmission of a polarization division multiplexed signal
AssigneeNokia Siemens Networks Oy
InventorsNancy Hecker, Dirk van den Borne
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Abstract
The polarsation-multiplexed signal contains two data signals that are orthogonally polarised in relation to one another. Their carrier signals are derived from the same source and thus have the same wavelength. The phase difference between the carrier signals, is adjusted or regulated in such a way that it corresponds to 90°. The phase difference of the carrier signals permits the susceptibility to polarization mode dispersion to be significantly reduced.
Claims12
-8. (canceled)
A method for optical transmission of a polarization division multiplexed signal having two orthogonal data signals whose carrier signals have the same wavelengths and are modulated by data signals, comprising:
- shifting the phase of the carrier signals so that the carrier signals are phase shifted 90° relative to one another,
- wherein the phase difference between the carrier signals is controlled.
A method for optical transmission of a polarization division multiplexed signal having two orthogonal data signals whose carrier signals have the same wavelengths and are modulated by data signals, comprising:
- shifting the phase of the carrier signals so that the carrier signals are phase shifted 90° relative to one another, the phase difference between the carrier signals is controlled;
- tapping off a measurement signal from the polarization division multiplexed signal to obtain a phase control criterion;
- and
- feeding the measurement signal to a DGD element tuned to the wavelength of the carrier signals,
- wherein an output signal of the DGD element is converted into an electrical signal, whereby a measured an a control signal is obtained, and
- wherein the phase between the carrier signals is varied so that the output signal of the DGD element attains an extreme value.
A method for optical transmission of a polarization division multiplexed signal having two orthogonal data signals whose carrier signals have the same wavelengths and are modulated by data signals, comprising:
- shifting the phase of the carrier signals so that the carrier signals are phase shifted 90° relative to one another, the phase difference between the carrier signals is controlled;
- tapping off a measurement signal from the polarization division multiplexed signal to obtain a phase control criterion;
- and
- splitting the measurement signal into two mutually orthogonal signal components,
- wherein the orthogonal signal components are converted into electrical signal components, and
- wherein the control signal is obtained from the amplitudes of the electrical signal components.
Dependencies are inferred from the claim text.