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A solution of optical sampling, based on Four-Wave mixing, as part of an optical oscilloscope has been investigated. Two experiments have been done. The first one has given a validation of this technique, by a 10 GHz NRZ signal optical sampling, comparing the results with commercial oscilloscope traces. The first one has permitted to test this technique for up-to-80 GHz RZ signals, comparing the results with commercial autocorrelator traces.