Cylindrical microresonator-based dispersion line for dispersive Fourier transformation

We propose using a cylindrical microresonator as a highly dispersive compact delay line for the spectral measurements relying on the dispersive Fourier transformation method. The cylindrical geometry implies a large anomalous dispersion of group velocities for the whispering gallery modes propagating next to the surface of the cylinder. To prove the concept, we demonstrate the frequency-to-time mapping of an optical soliton dispersed by the microcavity made of standard telecom fiber SMF-28.