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. 22, 2008
Filed:
Jun. 23, 2004
Yoshiaki Takeuchi, Tokyo, JP;
Masaru Watanabe, Tokyo, JP;
Ikuo Fukuzaki, Tokyo, JP;
Osaki Electric Co., Ltd., Shinagawa-ku, Tokyo, JP;
Abstract
In conventional optical isolators, an optical signal is dispersed by polarization or the characteristics are varied by heat generation in a garnet crystal. According to the invention, the crystal optical axis () of rutile crystal () is oriented so that the separation directions of the ordinary ray (O) and the extraordinary ray (E) are perpendicular to the plane including the optical axes of optical fibers (). Furthermore, the focusing central optical axis () of a focusing rod lens () is arranged parallel with optical axes of the optical fibers () and at a substantially equal distance from the four rays, i.e. the ordinary ray (O) and the extraordinary ray (E) propagating along the optical axis of the optical fiber () and the ordinary ray (O) and the extraordinary ray (E) propagating along the optical axis of the optical fiber (). An air gap () of about 200 [μm] is provided, as a heat insulating means, between the focusing rod lens () and a magnetized garnet crystal ().