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:
Aug. 29, 1995
Filed:
Aug. 08, 1994
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
An optical isolator is placed in the path of an input optical fiber and an output optical fiber, the optical isolator comprises: a first GRIN lens for receiving rays emitted from the input optical fiber and converging into parallel rays; a first birefringent crystal wedge for splitting the parallel rays into a first ray polarized along the birefringent crystal's optical axis and a second ray polarized perpendicularly to the optical axis; a second birefringent crystal wedge for recombining the first ray and the second ray wherein at least one of the first birefringent crystal wedge and the second birefringent crystal wedge comprises a birefringent crystal of YVO.sub.4 ; a second GRIN lens for focusing the recombined rays into the output optical fiber through the second birefringent crystal wedge; a Faraday rotator is mounted between the first birefringent crystal wedge and the second birefringent crystal wedge so that the rays emitted from the input optical fiber can be recombined and focused into the output optical fiber, and the rays reflected from the output optical fiber will be diverged and cannot be refocused into the input optical fiber.