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:
Jun. 21, 2022
Filed:
Jul. 09, 2021
Fujitsu Limited, Kawasaki, JP;
Tomoyuki Kato, Yokohama, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A wavelength conversion device includes a wavelength converter converts a wavelength band of a wavelength-division multiplex signal, a first wavelength filter transmits the wavelength-division multiplex signal on an input side of the wavelength converter, a second wavelength filter transmits the wavelength-division multiplex signal on an output side of the wavelength converter, and a controller controls a temperature of the wavelength converter such that a difference between a ratio of power of the wavelength-division multiplex signal which is not transmitted through the first wavelength filter on the input side to power of the wavelength-division multiplex signal which have been transmitted through the first wavelength filter on the input side and a ratio of a power of the wavelength-division multiplex signal which is not transmitted through the second wavelength filter on the output side to power of the wavelength-division multiplex signal which have been transmitted through the second wavelength filter.