Dispersion measurement in optical networks
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United States of America Patent
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May 11, 2004
Grant Date -
Jul 31, 2003
app pub date -
Jan 28, 2002
filing date -
Jan 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for measuring dispersion of a link between two switching nodes of an optical network comprises a phase measuring unit PMU for determining a first phase of a data signal traveling on a first wavelength .lambda.1, and a second phase of the same data signal traveling on a second wavelength .lambda.2, received consecutively over the link under measurement. A dispersion measurement controller controls operation of the phase measuring unit and characterizes the dispersion of the link at a wavelength of interest .lambda.=(.lambda.1+.lambda.2)/2, based on the first and second phases. The PMU includes a frame detector for determining a first and a second rotation signal indicative of the digital offset between the first and second test clocks with a respective frame start, and a phase detector for measuring the phase of these test clocks with respect to a static reference. The static reference is provided by the same data signal transmitted continuously over a reference wavelength. The test and reference clocks are 1:n divided to extend the range of the measurement. A method for characterizing the dispersion of a link of an optical network is also provided.
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