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Opto-electric phase-locked loop for recovering the clock signal in a digital optical transmission system

A phase-locked loop for a differential recovery of the clock signal wherein an extracted data signal (DS) is conveyed via a phase delay element and thence to a phase comparator. In the phase comparator comparison signals, whose phase shifts can be set relative to one another, differential phase evaluation is carried out. This results in a control signal (RS) whose operating point, independent of the power of the transmit channel, always lies in the center of the control range. In the inventive differential timing recovery, the dependencies on power fluctuations, signal-to-noise ratio, the pulse shape and on transmitted bit patterns are eliminated to the greatest possible extent.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV

Method for optical detection of an adjoining of a material component to a sensor material with the aid of biological, chemical or physical interaction and device for carrying out said method (variants)

Application: detection of binding of biological and / or chemical components of liquid or gaseous mixtures and solutions, which are of mainly biological origin and / or determine parameters of living activity of biological objects, to substances that bind the said components due to a biological, chemical or physical interaction; and analysis of mixtures and solutions to determine presence of biological and / or chemical components. Essence: binding substances are arranged on a surface of or inside a sensor layer, which changes its thickness due to the binding being detected; the layer is affected by light of different wavelengths; a signal due to interference on the sensor layer is registered in the reflected or transmitted light. In the first variant, the signal is represented by a spectrum; the sensor layer is more than 10 mum thick and exceeds the maximal recorded wavelength by at least an order of magnitude; information about the binding being detected is obtained from analysis of a spectral shift of interference maximums and minimums. In the second variant, the light passes also a scanned Fabry-Perot interferometer; the recorded signal is a dependence of intensity of the resulting light upon changes of base of the scanned Fabry-Perot interferometer, in which maximums due to correlation of the spectral characteristics of interaction of the light with the sensor layer and interferometer are observed; information about the binding being detected is obtained from a shift of the said dependence along values of base. In the third variant, other interferometers are used, which are scanned due to a change of the path difference of interfering beams. The required technical result is to make measurement results independent from uncontrollable variations of intensity of the analyzed light in whole as well as in any part of its spectrum, any areas of the sensor layer, and, consequently, to increase accuracy of measurements and reliability of results, sensitivity and resolution with simultaneous reduction of the number of necessary operations, of labor input and cost of both single- and multi-channel variants including real-time registration.
Owner:PETR IVANOVICH NIKITIN
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