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Cavity-based noise detection schemes are combined with ultrafast pulseshaping as a means to diagnose the spectral correlations of both the amplitudeand phase noise of an ultrafast frequency comb. The comb is divided into tenspectral regions, and the distribution of noise as well as the correlationsbetween all pairs of spectral regions are measured against the quantum limit.These correlations are then represented in the form of classical noisematrices, which furnish a complete description of the underlying comb dynamics.Their eigendecomposition reveals a set of theoretically predicted, decouplednoise modes that govern the dynamics of the comb. Finally, the matrices containthe information necessary to deduce macroscopic noise properties of the comb.

Spectral Noise Correlations of an Ultrafast Frequency Comb