Method for measuring the signal quality of an optical data signal
AssigneeSiemens Aktiengesellschaft
InventorsHarald Geiger, Christoph Glingener, Erich Gottwald
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Abstract
A method for measuring the signal quality of an optical data signal is provided. To measure the signal quality, and in particular the signal-to-noise ratio of an optical data signal which has data-free time intervals, the signal strength of the transmitted optical data signal is measured during a data transmission. The signal strength of the noise signal is determined during the data-free time intervals. The signal-to-noise ratio is determined and used as a criterion for the signal quality of the optical data signal.
Claims6
A method for measuring the signal quality of an optical data signal which has data-free time intervals within an optical network node of an optical transmission system, comprising:
- extracting a portion of the optical data signal within the optical network node;
- converting the extracted portion of the optical data signal into an electrical data signal;
- monitoring the electrical data signal for the occurrence of data-free time intervals;
- measuring a signal strength of a transmitted optical data signal;
- measuring a signal strength of a noise signal during the occurrence of the data-free time intervals;
- measuring a signal strength of the electrical data signal during data transmission;
- and
- determining a signal-to-noise ratio by reference to the measured signal strengths as a criterion for the signal quality of the optical data signal.
Dependencies are inferred from the claim text.