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:
Aug. 16, 2005
Filed:
Dec. 18, 2002
Youngkun Lee, Hachioji, JP;
Kazuhiko Hosomi, Tachikawa, JP;
Toshio Katsuyama, Ome, JP;
Tatsuya Tomaru, Hatoyama, JP;
Youngkun Lee, Hachioji, JP;
Kazuhiko Hosomi, Tachikawa, JP;
Toshio Katsuyama, Ome, JP;
Tatsuya Tomaru, Hatoyama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The invention provides an optical waveguide for enabling the reduction of a coupling loss caused by difference in the size of a mode field diameter between optical waveguide modes different in the mode field diameter and a coupling loss caused by reflection on a boundary caused by the difference of media and an optical device using it. Structure provided with a mode field diameter converter provided with an antireflection part required to reduce a coupling loss between a microoptical circuit and a single mode optical fiber is integrally produced using effective refractive index control based upon photonic crystal structure.