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:
Jan. 13, 2009
Filed:
Jan. 30, 2008
Miaoqing Wang, Shenzhen, CN;
Yatao Yang, Plano, TX (US);
Ting Xue, Tianjin, CN;
Yunhui Sun, Shenzhen, CN;
Miaoqing Wang, Shenzhen, CN;
Yatao Yang, Plano, TX (US);
Ting Xue, Tianjin, CN;
Yunhui Sun, Shenzhen, CN;
JDS Uniphase Corporation, Milpitas, CA (US);
Abstract
A variable optical attenuator is disclosed, which attenuates a beam of light while preserving its polarization substantially independent of wavelength. The beam of light is attenuated by a filter patterned with a grating of blocking stripes with serrated edges, which partially block and partially transmit the beam of light, respectively. The serrated edges provide for low polarization dependent loss. Along a length of the filter, a mark to space ratio of blocking stripe and aperture widths increases. By a linear translation of the filter along its length attenuation can be varied to a desired value. A stepper motor with lead screw can provide a suitable linear translation to give the filter a latching property.