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:
Dec. 14, 2004
Filed:
Mar. 01, 2002
Aritaka Ohno, Tokyo, JP;
Ryuji Usui, Tokyo, JP;
Kiyohisa Terai, Kanagawa, JP;
Masao Takahashi, Kanagawa, JP;
Kinichi Sasaki, Kanagawa, JP;
Japan Aviation Electronics Industry Limited, Tokyo, JP;
Abstract
A depolarizer is inserted between an optical branch unit and a polarization filter , a depolarizer and a polarization filter are inserted between an optical phase modulator and a quarter-wave plate , and a depolarizer and a polarization filter are inserted between the other branch end of the optical branch unit and a quarter-wave plate . The optical branch unit and the optical phase modulator are formed by single mode optical fibers, and single mode optical fibers are used to connect between optical elements, thus providing an arrangement which is inexpensive as a whole.