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:
Feb. 06, 2007
Filed:
Nov. 27, 2002
Steven Alleston, Leamington Spa, GB;
Liam Gleeson, Stratford-upon-Avon, GB;
Tim Ellingham, Erdington, GB;
Tony Walsh, Long Marston, GB;
Steven Alleston, Leamington Spa, GB;
Liam Gleeson, Stratford-upon-Avon, GB;
Tim Ellingham, Erdington, GB;
Tony Walsh, Long Marston, GB;
Ericsson AB, Stockholm, SE;
Abstract
A method and apparatus for transmitting a plurality of signals having different wavelengths through a length of optical cable which is caused to provide distributed gain by being subjected to Raman pumping at a plurality of pump wavelengths, the power levels of the pump signals being in a set ratio or ratios for providing, preferably, a flat gain profile over the range of wavelengths of the plurality of signals, the set power levels of the pump signals being determined from the measured effects of the pump signals on a probe signal and in relation to the wavelength separations among the probe signal, the pump signals and the plurality of signals having different wavelengths.