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. 14, 1998
Filed:
Aug. 23, 1996
Shigeru Ohshima, Yokohama, JP;
Tazuko Tomioka, Tokyo, JP;
Mitsuko Nakamura, Yokohama, JP;
Senji Shimanuki, Atsugi, JP;
Manish Sharma, Kawasaki, JP;
Hiroyuki Ibe, Yokohama, JP;
Hitoshi Takahira, Tokyo, JP;
Shu Yamamoto, Shiki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Kokusai Denshin Denwa Co., Ltd., Tokyo, JP;
Abstract
Light beams emitted from an optical fiber are converted into parallel light beams by a lens, and then allowed to pass through a Faraday device, followed by being converged to an incident end of the optical fiber by a lens. The Faraday device is applied with a magnetic field in a direction of the optical axis thereof from a coil. Moreover, the Faraday device is applied with a magnetic field in a direction perpendicular to the optical axis by a pair of magnets. When an electric current flowing in a coil 74 is changed from I to -I, the direction of a synthesized magnetic field can be rotated. Therefore, by arbitrarily changing the electric current flowing in the coil, polarization of transmission light can be controlled.