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:
Nov. 13, 2007
Filed:
Oct. 07, 2002
Shigekazu Harada, Tokyo, JP;
Akio Tajima, Tokyo, JP;
Shigekazu Harada, Tokyo, JP;
Akio Tajima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A wavelength division-multiplexing system is provided that uses wavelength grids in conformity with the ITU-T Recommendation G.692 and that is realizable at lower costs. In the system, the wavelengths of signal light beams transmitted from plural optical transmitters are respectively spaced apart in such a manner that multiplexed wavelengths are set at regular intervals within the band range of the optical amplifier. The wavelength range of each laser beam covers at least two grids including neighboring grids. The wavelength demultiplexeron the receiving side has the passband passing the wavelengths in a laser wavelength range corresponding to each channel.