Method for characterizing polarization transformers
AssigneeSiemens Aktiengesellschaft
InventorReinhold Noe
Life of this patent
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Abstract
For characterizing polarization transformers or PMD compensators, a polarization transformer to be characterized is operated as a mode converter with full mode conversion and variable orientation. A polarization control sees to it that a further polarization transformer assures the desired, overall polarization transformation. Conclusions about the precision with which the polarization transformer to be characterized works can be drawn from the nature and strength or, too, from the absence of changes of control signals of this further polarization transformer, and this can be improved. The method is particularly suited for the automatic follow-up of DC drift in polarization transformers or PMD compensators with lithium niobate components.
Claims24
A method for characterizing a polarization transformer, which is traversed by an optical signal, with a control function, said method comprising the steps of:
- providing a first polarization transformer to be characterized;
- providing a further polarization transformer that lies before or after the first polarization transformer in a light path of the optical signal and connected to said first polarization transformer, both said first polarization transformer and said further polarization transformer being traversed by the optical signal;
- performing a characterization of the first polarization transformer during implementation of one of polarization transformation and compensation of polarization mode dispersion of the optical signal by said further polarization transformer so that the control function is not negatively affected.
Dependencies are inferred from the claim text.