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:
Jan. 19, 1999
Filed:
Jan. 31, 1997
Applicant:
Inventor:
Katsuhiro Shirai, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
359341 ; 359177 ;
Abstract
A transmission device includes an exciting light source outputting an exciting light, a first optical part which supplies an optical amplifying part with a signal light and the exciting light, a second optical part which supplies an amplified light to an optical transmission line and receives a light received via the optical transmission line, and a control part which determines whether the light received includes the exciting light output by the exciting light source and controls the exciting light source to stop outputting the exciting light.