Temporal cavity solitons (CS) are pulses of light persisting in driven nonlinear cavities [1]. They obey the Lugiato-Lefever equation (LLE) [2] and belong to the broad class of localised dissipative structures. They have attracted much recent attention due to their potential applications in optical signal processing [1], and also due to their role in stable Kerr frequency comb formation in optical microresonators [3]. At high drive powers, or large cavity detunings, the temporal (and spectral) profiles of individual CSs are no longer stationary. Rather, CSs in this regime exhibit breathing (i.e., oscillatory) behaviour, with their evolution uniquely determined by only two parameters: S - the normalised driving power, and Δ - the normalised cavity detuning [1]. To date there has been only one experimental observation of CSs in this regime, and that work was restricted to observing the evolution of the CSs total energy only [4]. Here, we present for the first time, a real-time, roundtrip-by-roundtrip, measurement of the temporal evolution of the spectral profile of a breathing CS.

© 2015 IEEE

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