Patent ID: 6816684
Filing Date: 2004-11-09
Classification: H04B,H04L

Abstract:
A method of generating a clock signal of exact phase from an optical input signal that is divided up optically into two channels, one for data extraction to generate an electrical data signal and one for clack extraction to generate an electrical first clock signal, where the phase position of the first clock signal is corrected by comparison with the phase position of the data signal so that the phase position of the resulting clock signal formed after this correction is similar to the phase position of the data signal,where the resulting clock signal is obtained by a time delay of the first clock signal, and the value of the time delay is determined by the phase comparison of the data signal and the first clock signal, and where, for the comparison, periodic signals of frequency 2*pi/T are generated from the data signal and the clock signal, and wherein T is the time duration of a code element in the clock signal.