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. 21, 2005
Filed:
Mar. 06, 2003
Yung-chieh Hsieh, San Jose, CA (US);
Chiayu Ai, Newark, CA (US);
Hong LI, San Ramon, CA (US);
Dar-yuan Song, Irvine, CA (US);
Yung-Chieh Hsieh, San Jose, CA (US);
Chiayu Ai, Newark, CA (US);
Hong Li, San Ramon, CA (US);
Dar-Yuan Song, Irvine, CA (US);
Other;
Abstract
A tunable filter includes a polarizing beam splitter and a half-wave plate that produce two equally polarized beams from an arbitrarily polarized input light. The polarized beams are directed toward a tunable component that consists of an optical substrate coated with a filter and a reflective element on its back and front surface, respectively. The pass and stop beams emerging from the tunable component are retro-reflected by roof structures and passed again through the filter. As a result of this combination of components, the filter's performance is not dependent on polarization and the filter's output channels are not shifted or deviated by tuning.