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. 18, 2004
Filed:
Feb. 27, 2001
Applicant:
Inventors:
Yann Frignac, Paris, FR;
Sébastien Bigo, Palaiseau, FR;
Assignee:
Alcatel, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J 1/402 ;
U.S. Cl.
CPC ...
H04J 1/402 ;
Abstract
The invention relates to a wavelength division multiplex transmission system; for one channel, the spectral interval between adjacent channels on one side is different from the spectral interval between adjacent channels on the other side. A demultiplexing filter is used which attenuates more strongly the spectrum of the channel on the side on which the spectral interval between adjacent channels is smaller. The invention improves spectral efficiency and retains frequencies chosen from a grid of regularly spaced frequencies.