Apparatus and method for polarization sensing
AssigneeNokia Solutions and Networks Oy
InventorsRobbe VAN ROMPAEY, Wouter LAINNEER, Laurens BREYNE
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Abstract
An apparatus for use by a coherent receiver is configured to perform obtaining a first set of coefficients indicating a first filter in an adaptive equalizer of the coherent receiver, wherein the first filter is an adaptive Multi-Input Multi-Output, MIMO, filter with N taps in each branch, wherein N is an integer number; determining a further set of coefficients indicating a MIMO filter with a single tap in each branch based on the first set of coefficients; determining a first matrix based on the further set of coefficients; orthogonalizing the first matrix, thereby obtaining an orthogonalized matrix; determining a state-of-polarization based on at least part of the orthogonalized matrix.
Claims15
An apparatus for use by a coherent receiver, comprising:
- at least one memory configured to store instructions;
- and
- at least one processor configured to execute the instructions and cause the apparatus to perform,
- obtaining a first set of coefficients indicating a first filter in an adaptive equalizer of the coherent receiver, wherein the first filter is an adaptive Multi-Input Multi-Output, MIMO, filter with N taps in each branch, wherein N is an integer number;
- determining a further set of coefficients indicating a MIMO filter with a single tap in each branch based on the first set of coefficients;
- determining a first matrix based on the further set of coefficients;
- orthogonalizing the first matrix, thereby obtaining an orthogonalized matrix;
- determining a state-of-polarization based on at least part of the orthogonalized matrix.
A method, comprising:
- obtaining a first set of coefficients indicating a first filter in an adaptive equalizer of the coherent receiver, wherein the first filter is an adaptive Multi-Input Multi-Output, MIMO, filter with N taps in each branch, wherein N is an integer number;
- determining a further set of coefficients indicating a MIMO filter with a single tap in each branch based on the first set of coefficients;
- determining a first matrix based on the further set of coefficients;
- orthogonalizing the first matrix, thereby obtaining an orthogonalized matrix;
- determining a state-of-polarization based on at least part of the orthogonalized matrix.
A non-transitory computer readable medium comprising instructions for causing an apparatus to perform at least the following:
- obtaining a first set of coefficients indicating a first filter in an adaptive equalizer of the coherent receiver, wherein the first filter is an adaptive Multi-Input Multi-Output, MIMO, filter with N taps in each branch, wherein N is an integer number;
- determining a further set of coefficients indicating a MIMO filter with a single tap in each branch based on the first set of coefficients,
- determining a first matrix based on the further set of coefficients;
- orthogonalizing the first matrix, thereby obtaining an orthogonalized matrix;
- determining a state-of-polarization based on at least part of the orthogonalized matrix.
Dependencies are inferred from the claim text.