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. 22, 2001
Filed:
Jun. 17, 1998
Dogan A. Atlas, Duluth, GA (US);
Other;
Abstract
A system and method for reducing Raman cross-talk between optical signals having different wavelengths in an optical communications system. Optical signals having wavelengths &lgr;,, &lgr;,, &lgr;,, and &lgr;,, respectively, are launched into an optical fiber at the headend of the system by an optical transmitter. Each wavelength &lgr; is preferably separated from each adjacent wavelength by the same amount, &Dgr;&lgr;. &lgr;,and &lgr;,have vertical polarizations and &lgr;,and &lgr;,have horizontal polarizations. Because there is no Raman cross-talk between orthogonally polarized optical signals, there will be no Raman cross-talk between &lgr;,and &lgr;,, between &lgr;,and &lgr;,, between &lgr;,and &lgr;,, or between &lgr;,and &lgr;,. However, there is Raman cross-talk between &lgr;,and &lgr;,because each is vertically polarized and also between &lgr;,and &lgr;,because each is horizontally polarized. The amount of Raman cross talk is minimized because the wavelength difference between vertically polarized signals &lgr;,and &lgr;,, and also between horizontally polarized signals &lgr;,and &lgr;,, is only &Dgr;&lgr;, which is the smallest wavelength difference between adjacent optical signals.