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1. (WO2018145753) METHODS AND APPARATUS FOR OPTICAL POLARIZATION CONTROL

Pub. No.:    WO/2018/145753    International Application No.:    PCT/EP2017/052930
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: G02F 1/01
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: D'ERRICO, Antonio
GIURLANDA, Francesco
Title: METHODS AND APPARATUS FOR OPTICAL POLARIZATION CONTROL
Abstract:
A polarization controller (10;40) is configured to control polarization of an optical signal. The polarization controller comprises a first polarization rotator (18) and a second polarization rotator (28) controllable by control settings. The polarization controller comprises a monitor unit (34) configured to generate a monitoring value indicating a performance of the polarization controller. The polarization controller is configured to determine from the monitoring value if the polarization controller is operating in a selected one of a plurality of optimal performance states (52). If operation is not in an optimal performance state, the polarization controller is further configured to select different control settings to select an alternate one of the plurality of optimal performance states for the polarization controller.