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. 06, 2004
Filed:
Sep. 13, 2002
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/28 ; H01S 3/091 ; H01S 3/00 ;
U.S. Cl.
CPC ...
G02B 6/28 ; H01S 3/091 ; H01S 3/00 ;
Abstract
An optical transmission equipment for use in an optical transmission system, having an optical amplifier ( A), comprising: a first optical doped fiber ( A); a second optical doped fiber ( B); a third optical doped fiber ( C); an optical isolator ( ) of bringing loss in the optical signal, being provided between the first optical doped fiber and the second optical doped fiber; a dispersion compensator ( ) being provided between the second optical doped fiber and the third optical doped fiber; and a pumping light source ( ) being optically connected to so that the optical doped fibers ( A, B, C) are excited in common.