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. 25, 2004
Filed:
Sep. 30, 2002
Applicant:
Inventor:
Kayato Sekiya, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 3/00 ;
U.S. Cl.
CPC ...
H01S 3/00 ;
Abstract
When Raman amplification is performed, the occurrence of lightwaves through FWM in a wavelength band of input signal light is suppressed, thereby avoiding deterioration of the signal quality. Allocation of lightwaves of the pumping light is controlled so that, wavelengths of lightwaves arising through a nonlinear effect of pumping lights generated by a pumping means or of pumping lights and input signal light, or both, are not within the wavelength band of the input signal light.