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:
May. 16, 2006
Filed:
Jun. 19, 2002
Hiroshi Yoshikawa, Tokyo, JP;
Yasuko Andoh, Sagamihara, JP;
Keiichiro Itoh, Iruma, JP;
Masakatsu Senda, Mito, JP;
Yoshiaki Kurokawa, Chiba, JP;
Takaya Tanabe, Tokorozawa, JP;
Hiroshi Yoshikawa, Tokyo, JP;
Yasuko Andoh, Sagamihara, JP;
Keiichiro Itoh, Iruma, JP;
Masakatsu Senda, Mito, JP;
Yoshiaki Kurokawa, Chiba, JP;
Takaya Tanabe, Tokorozawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A holographic medium is formed of an optical waveguide including at least one core layer positioned between at least one portion of a material having a lower refractive index, a diffraction grating layer formed at a boundary between the core layer and the material of lower refractive index or in the core layer, and a storage layer outside the optical waveguide. Upon storing information in the storage layer a reference beam and an object are input into the optical waveguide and in retrieving stored information the reference beam is emitted to an end face of the core layer and transmitted through the core layer to be transformed into a diffracted beam in a diffraction grating layer that is emitted outside the core layer and transmitted through the storage layer, where the object beam is retrieved as a retrieved beam.