Polarization of an optical light transmitted through an OPGW is changed by influence of electric current flows in the twisted metal line at the surface of the OPGW. High speed polarization change is caused by serge current such as lightning stroke current or power line fault current. It might induce a trouble of an optical communication system using an OPGW. In order to evaluate the speed of the polarization change at the moment of flowing surge current, polarization state of the optical signal through an OPGW in the field is observed from the summer to the winter. As a result, examples of polarized change according to the falling of a thunderbolt to an OPGW or the other causes are obtained.
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