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:
Jan. 18, 2005
Filed:
Mar. 31, 2003
Naoki Hanashima, Tokyo, JP;
Tohru Kineri, Tokyo, JP;
Naoki Hanashima, Tokyo, JP;
Tohru Kineri, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The optical branching device includes an input optical waveguide for outputting light inputted from a light input end face to a light output end face, a tapered optical waveguide having one end face connected to the light output end face and a width expanding at a predetermined angle, and branching optical waveguides connected to the other end face of the tapered optical waveguide at a predetermined branching angle, in which when a propagation constant of a leaky mode is β, a propagation constant of a fundamental mode is β, a meander period is Λ, and Λ=2π/(β-β), an optical waveguide length L from a position which becomes a cause of the leaky mode to the light output end face is substantially integer times Λ/2.