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:
May. 10, 1988
Filed:
May. 30, 1985
Applicant:
Inventors:
Katsuyuki Utaka, Musashino, JP;
Shigeyuki Akiba, Tokyo, JP;
Yukitoshi Kushiro, Tokyo, JP;
Yukio Noda, Yokohama, JP;
Assignee:
Kokusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; H01S / ;
U.S. Cl.
CPC ...
350 9619 ; 350 9613 ; 350 9614 ; 372 96 ;
Abstract
An optical modulation element is disclosed in which a diffraction grating is formed along a waveguide for guiding unmodulated incident light and inclined to the direction of travel of the light, and a structure is provided for changing the refractive index of the waveguide portion where the diffraction grating is formed. the refractive index of the waveguide portion can be effected by voltage application, by current injection or by light irradiation.