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:
Mar. 05, 2002
Filed:
Oct. 14, 1999
Applicant:
Inventors:
Charles Wong, Plano, TX (US);
Yen-Chen Chen, Hsinchu, TW;
Kuang-Yi Wu, Boulder, CO (US);
Jian-Yu Liu, Boulder, CO (US);
Assignee:
Chorum Technologies Inc., , TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09K 1/902 ; G02F 1/1335 ;
U.S. Cl.
CPC ...
G09K 1/902 ; G02F 1/1335 ;
Abstract
A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0° and 90°, and preferably between 50° and 80° is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios, such as greater than −25 dB. Preferably the liquid crystal entrance director differs from the polarization direction by a beta angle of about 15°.