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. 02, 1993
Filed:
Apr. 22, 1991
Applicant:
Inventor:
Kazuhito Tajima, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F / ; G02F / ; G02B / ;
U.S. Cl.
CPC ...
385122 ; 385-5 ; 359328 ; 359326 ;
Abstract
A nonlinear optical device for controlling a signal light by a control light comprises a waveguide region consisting of an optical nonlinear semiconductor material, and an electrostatic field generator, which is a DC supply for example. Carriers (electrons and holes) generated by excitation of electrons due to a control light having a predetermined wavelength supplied to the waveguide region are swept away from the waveguide region by an electrostatic field, so that the change of nonlinear refractive index of the waveguide region can follow the change of the control light to increase the operation speed of the nonlinear optical device.