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. 07, 2003
Filed:
Dec. 07, 1998
Applicant:
Inventors:
Keiji Tanaka, Tokyo, JP;
Noboru Edagawa, Tokyo, JP;
Hidenori Taga, Tokyo, JP;
Shu Yamamoto, Tokyo, JP;
Assignee:
KDD Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 1/016 ; H04B 1/002 ; H04B 1/012 ; H04J 1/402 ; H01S 3/00 ;
U.S. Cl.
CPC ...
H04B 1/016 ; H04B 1/002 ; H04B 1/012 ; H04J 1/402 ; H01S 3/00 ;
Abstract
To increase the number of multiplexed wavelengths and to improve transmission characteristics in a wavelength-division-multiplexed transmission, a bandwidth compressor for bandwidth-compressing the wavelength-division-multiplexed signal light is disposed at a front part of respective optical amplifiers and a bandwidth expander for bandwidth-expanding the wavelength-division-multiplexed signal light output from said optical amplifiers is disposed at a rear part of said optical amplifiers.