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:
Jun. 14, 1988
Filed:
Aug. 08, 1985
Applicant:
Inventor:
Ryoji Ohba, Sapporo, JP;
Assignee:
Hokkaido University, Sapporo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ; H01S / ;
U.S. Cl.
CPC ...
332-751 ; 350358 ; 350371 ; 455611 ; 455613 ;
Abstract
A semiconductor laser light modulation and demodulation system to be used in light communication system is realized. In the modulation system, strength modulated pressure wave or electromagnetic wave is directly applied to an active region of a semiconductor laser element and the frequency modulation is effected by varying an effective length of a laser resonator formed by the element. In the demodulation system, modulation signal is derived by an interference of the received laser light by splitting and then joining together after passing an interferometer having different path length arms.