Method and arrangement for determining the dispersion of an optical transmission link
AssigneeSiemens Aktiengesellschaft
InventorErich Gottwald
Life of this patent
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Abstract
The invention relates to a method and an arrangement for determining the dispersion of an optical transmission link. By determining the signal quality, the bit error rate is measured for a modulated data signal depending on the modulation frequency of a noise signal (STS). The dispersion coefficient of the transmission link is calculated on the basis of the resulting discrete minima of the bit error rates. These measurements can take place advantageously during the operation of the data transmission. The method also provides additional information about the quality of the data transmission by determining the non-linear phase shift.
Claims19
A method for determining a dispersion of an optical transmission link, wherein a data signal is transmitted from a sender to a receiver, the method comprising:
- modulating the data signal on the sending side using an adjustable noise signal having an adjustable frequency;
- determining the signal quality of the received data signal on the receiving side;
- changing the frequency of the noise signal and redetermining the signal quality, wherein this procedure is repeated until having an optimal frequency of the noise signal, wherein a maximal signal quality or a minimal interference of the noise signal is established;
- and
- determining the dispersion from the optimal frequency of the noise signal.
A method for determining the dispersion of an optical transmission link,
- in which a data signal is transmitted from a sender to a receiver,
- wherein
- the data signal is modulated on the sending side using an adjustable noise signal which has an adjustable frequency,
- the signal quality of the received data signal is determined on the receiving side,
- the frequency of the noise signal is varied and the signal quality is measured again,
- this procedure is repeated until a maximal signal quality or a minimal interference of the noise signal is established in the case of an optimal frequency of the noise signal, and
- the dispersion is calculated from the optimal frequency of the noise signal.
An arrangement for determining a dispersion of an optical transmission link having a wavelength multiplexer on the sending side, the arrangement comprising:
- a modulation unit for amplitude-modulating a data signal using a noise signal, wherein the modulation unit is arranged on the sending side, and wherein the modulation unit is configured in such a way that it can be adjusted in frequency and amplitude;
- a measuring unit for capturing the signal quality of the data signal;
- and
- an evaluation unit, wherein the measuring unit and the evaluation unit are arranged on the receiving side, and wherein the evaluation unit is connected to the modulation unit via a service channel of a system control for the purpose of controlling and adjusting the frequency and/or the amplitude of the noise signal.
Dependencies are inferred from the claim text.