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. 15, 1999
Filed:
Oct. 17, 1996
Applicant:
Inventors:
Tadashi Koga, Tokyo, JP;
Yasuhiro Aoki, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
359179 ; 359174 ; 359178 ;
Abstract
It is the object of the invention to eliminate a limitation on the transmission distance of a WDM optical transmission system caused by wavelength dependencies of gains of optical amplification repeaters. The transmission characteristic of optical signal of the transmission system against the signal wavelength can be flatted by using plural kinds of the optical amplification repeaters with different gain peak wavelengths, and the longer transmission distance can be obtained.