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:
Apr. 04, 2006
Filed:
Sep. 20, 2002
Teruhisa Sahashi, Shizuoka, JP;
Hidenori Nakada, Aichi, JP;
Shohei Abe, Shizuoka, JP;
Isao Kojima, Aichi, JP;
Keisuke Ikeda, Shizuoka, JP;
Teruhisa Sahashi, Shizuoka, JP;
Hidenori Nakada, Aichi, JP;
Shohei Abe, Shizuoka, JP;
Isao Kojima, Aichi, JP;
Keisuke Ikeda, Shizuoka, JP;
FDK Corporation, Tokyo, JP;
Abstract
A reflection-type variable optical attenuator comprises: a main attenuator unit including a first birefringent crystal plate, a Faraday rotational angle varying unit, and a second birefringent crystal plate arranged in this order; an input port and an output port that are arranged on a side of one end of the main attenuator unit; and a two-point reflection-type optical path varying reflector that is arranged on a side of the other end of the main attenuator unit. Light that comes in from the input port makes a round trip in the main attenuator unit and goes out through the output port.