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:
Sep. 14, 1999
Filed:
Sep. 30, 1997
Applicant:
Inventor:
Frank A McKiel, Jr, Plano, TX (US);
Assignee:
MCI Communications Corporation, Washington, DC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
359124 ; 359111 ; 359161 ; 379417 ;
Abstract
An efficient and inexpensive system and method for reducing crosstalk between adjacent channels in a high density WDM transmission. The technique provided herein cancels out the effects of crosstalk by processing signals in the electrical domain after the optical WDM transmission has been demultiplexed. Specifically, a WDM transmission is received and demultiplexed into its constituent channels via a plurality of optical filters. Each channel is then transduced into an electrical signal using a photodetector or the like. Each electrical signal is then inverted, attenuated and added to one or two adjacent channels to cancel crosstalk therein.