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:
Jul. 24, 2018
Filed:
Jul. 31, 2017
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Hiroyuki Irie, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A signal processing circuit generates first to fourth drive signals to which first to fourth fixed pattern are respectively added. An optical modulators generate a first polarization multiplexed optical signal of a first wavelength from the first and second drive signals and a second polarization multiplexed optical signal of a second wavelength from the third and fourth drive signals. The first to third fixed patterns are the same as one another, and a value of each bit of the fourth fixed pattern is inverted with respect to a value of a corresponding bit of the third fixed pattern. The signal processing circuit generates the first to fourth drive signals such that the first to fourth fixed patterns are transmitted at the same or approximately the same time by the first polarization multiplexed optical signal and the second polarization multiplexed optical signal.