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 (3) 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 (3). Out of the binarized signal (S), a data regeneration circuit (6) 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 (4). This is integrated in an integrator (5) and fed back to the limiter's (3) 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).

Abstract: Optical receiver arranged to provide a dispersion-compensated detection of digital information transferred by a light pulse train via a fibre optic conductor, includes a registering means and a timing regenerating means connected in parallel to the fibre optic conductor via an optoelectrical converter. The registering means has a sampling terminal, an activation input that is arranged for a short activation of the sampling contact and which is connected to the timing regenerating means, and an output that is arranged for reproducing the registered digital information transferred by the light pulse train. According to the invention, the optical receiver has a decision means with a decision level determining input supplied with a control voltage obtained from the output of the registering means via a digital-to-analog converting link and is interconnected between the optoelectrical converter and the sampling contact of the registering means.