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:
Jun. 05, 2001
Filed:
Dec. 28, 1998
Lars-Erik Enfors, Vällingby, SE;
Gunnar Stefan Forsberg, Stockholm, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to a method and an arrangement for the automatic compensation of a DC-level for an incoming signal (IN) converted into an electrical form for the decision threshold level of binarizing limiter (,) in a fibre optic receiver. From the input signal (IN) converted to an electrical form, a comparison signal (INT) is subtracted, whereupon the signal is binarized by the signal limiter (,). Out of the binarized signal (S), a data regeneration circuit (,) generates the most probable transmitted signal. Based on the so achieved output signal (UT) and the binarized signal (S), a difference signal (D) is formed in a difference signal former (,). This is integrated in an integrator (,) and fed back to the limiter's (,) input for the comparison signal (INT). In this way, offset voltages are compensated for. At the same time, account is taken of the true pulse quotient of the incoming optical signal (O).