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:
Jan. 08, 2002
Filed:
Aug. 19, 1998
Anders Djupsjöbacka, Solna, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to an optical duobinary transmitter system and method using optical intensity modulation. The system comprises an input terminal ( ) arranged to receive a first binary signal, a driving circuit ( ) connected to the input terminal and arranged to convert the first binary signal into a second and a third binary signal, a double electrode optical modulator ( ) connected to the driving circuit in such a way that its upper and lower electrode may be driven by said second and third binary signal, respectively, said modulator being further arranged to modulate the amplitude and phase of an optical carrier according to the binary driving signals so as to provide an optical duobinary signal corresponding to said first binary signal and with a predetermined negative modulation chirp parameter, and an output terminal ( ) connected to the optical modulator and arranged to feed an optical transmission line with the modulated optical duobinary signal. The modulator may alternatively be arranged to be driven by quasi-ternary signals.