Polarization change tracking apparatus, processing apparatus for received signal and methods thereof
AssigneeFujitsu Limited
InventorsJingnan Li, Yangyang Fan, Zhenning Tao
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Abstract
A polarization change tracking apparatus, a processing apparatus for a received signal and methods thereof. The polarization change tracking method includes: estimating a polarization change speed in a link according to a received signal; setting a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive; and performing compensation for polarization change on the received signal according to a set response coefficient of polarization tracking.
Claims9
An optical receiver, comprising:
- a receiver configured to receive a signal after a transmit signal is propagated via a link, pilot signals being inserted in the transmit signal, and the pilot signals being located on a plane in a Stokes space;
- and
- a processor configured to:
- transform pilot signals in a received signal from a Jones space into the Stokes space to obtain Stokes vectors of the pilot signals;
- calculate a polarization change matrix of the pilot signals according to the Stokes vectors of the pilot signals;
- and
- estimate a polarization change speed of the link according to the polarization change matrix;
- set a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive;
- and
- perform compensation for polarization change on the received signal according to the set response coefficient of polarization tracking,
- wherein the response coefficient of polarization tracking contains a first part in association with the response of adaptive equalization and a second part in association with the polarization change in the link.
An optical receiver, comprising:
- a receiver configured to receive a signal after a transmit signal is propagated via a link, pilot signals being inserted in the transmit signal, and the pilot signals being located on a plane in a Stokes space;
- and
- a processor configured to:
- transform pilot signals in a received signal from a Jones space into the Stokes space to obtain Stokes vectors of the pilot signals;
- calculate a polarization change matrix of the pilot signals according to the Stokes vectors of the pilot signals;
- and
- estimate a polarization change speed of the link according to the polarization change matrix;
- set a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive;
- and
- perform compensation for polarization change on the received signal according to the set response coefficient of polarization tracking, and
- output a polarization changed compensated received signal;
- and
- an adaptive equalizer configured to perform adaptive equalization processing on the polarization changed compensated received signal to obtain an adaptive equalization processed signal,
- wherein the response coefficient of polarization tracking contains a first part in association with the response of adaptive equalization and a second part in association with the polarization change in the link.
Dependencies are inferred from the claim text.