The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 2018
Filed:
Feb. 02, 2016
Optical transmission apparatus, optical transmission system, and polarization dependent loss monitor
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Taketo Endo, Kawasaki, JP;
Kosuke Komaki, Kawasaki, JP;
Taku Saito, Kawasaki, JP;
Hirofumi Araki, Kawasaki, JP;
Makoto Shimizu, Oyama, JP;
Hiroshi Nishida, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
An optical transmission apparatus includes: a coherent detector configured to receive light including different polarization components from an optical transmission path, and perform coherent detection of received light including the different polarization components; an adaptive equalizer configured to adaptively equalize, by a digital filter, a complex electric signal for each of the polarization components obtained by the coherent detection, a gain value for controlling an amplitude of the complex electric signal being applied to the complex electric signal; and a polarization dependent loss monitor configured to determine a polarization dependent loss of the optical transmission path, based on a correction filter parameter obtained by correcting a filter parameter of the digital filter according to the gain value, the filter parameter being adaptively updated by an adaptive equalization of the adaptive equalizer.