Acterna Eningen Gmbh

Wavetek Wandel Goltermann Eningen Gmbh & Co.

Wolfgang Hoyer

Helmut Dollinger

Roland Bach

In a method for measuring the chromatic dispersion of a light waveguide an amplitude modulated broadband optical signal is fed into the optical transmission link to be measured, the transmitted signal is separated into a reference path, in which the modulation frequency is demodulated out of the transmitted signal, and a measuring path, in which the transmitted signal is demodulated at several optical frequencies respectively, and the chromatic dispersion of the optical transmission link is determined from the phase differences between the several demodulated signals of the measuring path and the demodulated signal of the reference path.

Apparatus and method for measuring the chromatic dispersion of an optical transmission link

The process to measure the signal quality of a digital information transmission system using a scanning device with adjustable direct current threshold can determine a signal parameter for the signal quality (Q-factor), which can determine the bit-rate from an unknown input signal and with its help a clock signal can be generated to scan the input signal with the scanning device. The device includes a detection device as well as a clock generator, which is connected to the detection device and receives a pre-adjustment signal, and which synchronizes with the input signal over a phase locked loop with the scanning device through phase comparison. Process and device allow the monitoring of systems in a shortest time and facilitate statements concerning the bit-rate of the respective line section as well as concerning the size of the Q-factor and all relating variables.

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Pfullingen, Germany

Wolfgang Hoyer