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.

Abstract: The present invention relates to a frequency modulated oscillator, preferably operating within the microwave range, comprising a resonator having a reversed biased semi-conductor element, for example, a Gunn diode and voltage dependent capacitor, for example a varactor diode acting as a frequency modulator and being connected to a modulating signal source. In order to linearize the modulation characteristic, there is a resonant circuit in the resonator which circuit is tuned to the first harmonic 2fo of the unmodulated fundamental frequency fo of the oscillator. When modulating the varactor diode the resonant circuit becomes detuned and the voltage across the Gunn diode is changed so that its capacitance is also changed to change the fundamental frequency fo which compensates the non-linear change in the modulation characteristic of the varactor diode.