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. 12, 2008
Filed:
Mar. 14, 2006
Koutarou Tanaka, Nakagun Toukaimura, JP;
Nobuaki Kitano, Hitachi, JP;
Yukio Abe, Hitachi, JP;
Haruyasu Komano, Hitachi, JP;
Koutarou Tanaka, Nakagun Toukaimura, JP;
Nobuaki Kitano, Hitachi, JP;
Yukio Abe, Hitachi, JP;
Haruyasu Komano, Hitachi, JP;
Hitachi Cable, Inc., Tokyo, JP;
Abstract
A waveguide type variable optical attenuator is provided with a substrate for forming a waveguide for optical signal propagation; a waveguide element comprising 2 arm waveguides arranged on the surface of the substrate for constituting a portion of the waveguide and cladding for covering the arm waveguides and the surface of the substrate; and a heater arranged on the surface of the waveguide element for heating the arm waveguides. The 2 arm waveguides are connected thermally.