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:
Feb. 11, 2014
Filed:
Oct. 15, 2010
Atsushi Okamoto, Hokkaido, JP;
Kazuyuki Morita, Hokkaido, JP;
Atsushi Okamoto, Hokkaido, JP;
Kazuyuki Morita, Hokkaido, JP;
National University Corporation Hokkaido University, Hokkaido, JP;
Abstract
The present invention causes spatial-mode light emitted from an optical fiber (), which is a multimode fiber, to pass through a photorefractive medium (). The photorefractive medium () includes holograms for signal separation that are written by irradiation of the photorefractive medium with (i) guide light having a wave front identical to the wave front of signal light having a particular spatial mode and (ii) control light. The photorefractive medium includes holograms recorded in a multiplex manner with use of control light having different incidence angles in correspondence with respective spatial modes. For signal separation, irradiating the photorefractive medium () with control light () having a particular angle separates signal light having a spatial mode corresponding to the incidence angle of the control light ().