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. 12, 2008
Filed:
Jun. 18, 2004
Chun He, Frement, CA (US);
Chun He, Frement, CA (US);
Alliance Fiber Optic Products, Inc., Sunnyvale, CA (US);
Abstract
Techniques for designing optical devices with high reflection isolation are disclosed. According to one aspect of the devices, a pair of conjugate optical filters is used. To preserve the performance of the filters and minimize insertion loss, a lens has a first side and a second side, the first side being preferably perpendicular to an optical axis of the lens, and the second side being nearly perpendicular to the optical axis of the lens. Thus one of the conjugate optical filters is deposed towards the first side of the lens and the other one of the conjugate optical filters is deposed towards the second side of the lens. When a reflected light from one filter, presumably carrying residuals of a transmitted signal, hits another filter, the residuals are blocked, resulting in great isolation for the R-channel from the T-channel.