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:
Jun. 29, 1999
Filed:
Oct. 09, 1997
Toshiaki Watanabe, Gunma, JP;
Toshihiko Ryuo, Gunma, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
An optical isolator has a high ratio of the quantity of signals S to that of noises N (S/N ratio) and can be miniaturized such a size that it can easily be incorporated into a laser module. The optical isolator 1 according to the present invention is one to be connected to a semiconductor laser 11 having a linear polarization plane and comprises a Faraday's rotator 5 and a magnetic material 4 for establishing a magnetic field around the rotor on the light-incident side of the isolator and an optical material 6 for polarization on the light-outputting side thereof. In particular, the optical isolator 1 of the present invention is one to be connected to a semiconductor laser 11 having a linear polarization plane while aligning a polarization direction guide 3 of the isolator with the semiconductor laser 11, comprises a Faraday's rotator 5 whose light-incident and -outputting sides are desirably inclined with respect to the optical path and an annular magnetic material 4 surrounding the rotator 5, on the light-incident side of the isolator and an optical material 6 for polarization, on the light-outputting side thereof, whose light-incident and -outputting sides are desirably inclined with respect to the optical path, and the optical material for polarization is more desirably made of a metal-containing glass material.