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:
Oct. 21, 2008
Filed:
Mar. 01, 2005
Katsumi Furuya, Ibaraki, JP;
Kazuhiro Komori, Ibaraki, JP;
Noritsugu Yamamoto, Ibaraki, JP;
Yoshinori Watanabe, Ibaraki, JP;
Katsumi Furuya, Ibaraki, JP;
Kazuhiro Komori, Ibaraki, JP;
Noritsugu Yamamoto, Ibaraki, JP;
Yoshinori Watanabe, Ibaraki, JP;
Japan Science and Technology Agency, Saitama, JP;
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Abstract
A photonic crystal directional coupler composed of at least two linear defect waveguides introduced into a photonic crystal. The medium constant and the lattice constant of the photonic crystal at the photonic crystal directional coupling part, the sizes and shapes of the elements constituting the periodical structure of the photonic crystal are varied. Thereby the difference in propagation constant between the even and odd modes of the photonic crystal directional coupling part is increased, thus shortening the coupling length of the photonic crystal directional coupler.