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. 09, 2015
Filed:
Feb. 01, 2013
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Kazuo Hironishi, Yokohama, JP;
Takeshi Hoshida, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A front end device includes: an optical filter configured to receive a WDM optical signal including a plurality of optical signals each having a superposing signal superposed thereon by frequency shift keying, with a transmittance being periodically changed with respect to a wavelength and a wavelength with which a peak of the transmittance appears being shifted according to an incident angle; an optical structure configured to guide the WDM optical signal to the optical filter so that the WDM optical signal enters the optical filter at a plurality of different angles; and an optical detector configured to convert an optical signal output from the optical filter to an electrical signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile