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. 08, 2000
Filed:
Sep. 29, 1998
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A light-modulating element having a RQB medium, a pair of electrodes provided on the RQB medium and connected to a high-frequency power supply, a signal light source for emitting two signal light beams, and two optical fibers for guiding the signal light beams to the RQB medium. In the element, the conditions .sigma..sub.23 .ltoreq..sigma..sub.12 and .sigma..sub.23 .ltoreq..sigma..sub.13 are satisfied, where .sigma..sub.12 is the standard deviation (inhomogeneous broadening) of energies of impurities between a first level and a second level, .sigma..sub.13 is the standard deviation (inhomogeneous broadening) of energies of impurities between first level and a third level, and .sigma..sub.23 is the standard deviation (inhomogeneous broadening) of energies of impurities between the second and third levels, all impurities existing in the RQB medium.