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:
Dec. 30, 2008
Filed:
Jun. 26, 2002
Robert Friskney, Harlow, GB;
Adrian Sparks, Ongar, GB;
Robert Spagnoletti, Hertford, GB;
Robin Rickard, Spellbrook, GB;
Robert Friskney, Harlow, GB;
Adrian Sparks, Ongar, GB;
Robert Spagnoletti, Hertford, GB;
Robin Rickard, Spellbrook, GB;
Nortel Networks Limited, St. Laurent, Quebec, CA;
Abstract
An optical communications system has a transmitter which uses modulation using multiple level phase and/or amplitude modulation, and is adaptable to provide modulation for different signals using different selections of the multiple levels. A receiver is able to perform demodulation from the multiple level phase and/or amplitude modulation, and is adaptable to provide demodulation of signals modulated using the different selections of the multiple levels. This provides an adaptive modulation system, so that different bit rates can be employed for different links.