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. 21, 2015
Filed:
Mar. 15, 2012
Akira Yahagi, Annaka, JP;
Toshiaki Watanabe, Annaka, JP;
Akira Yahagi, Annaka, JP;
Toshiaki Watanabe, Annaka, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
An optical module is provided that includes a Faraday rotator having a Verdet constant at a wavelength of 1.06 μm of at least 0.27 min/(Oe·cm), a first hollow magnet disposed on the outer periphery of the Faraday rotator, and second and third hollow magnet units disposed so as to sandwich the first hollow magnet on the optical axis. The second and third hollow magnet units include 2 or more magnets equally divided in a direction of 90 degrees relative to the optical axis. A magnetic flux density B (Oe) applied to the Faraday rotator is in the range of 0.5×10≦B≦1.5×10. The Faraday rotator is disposed on a sample length L (cm) in the range of 0.70≦L≦1.10, and has an external diameter D (cm) in the range of 0.20≦D≦0.60.