Fig. 2: Dynamics of the central wavelength in the counter-clockwise (CCW) direction.
From: Pulse-onset dynamics in a bidirectional mode-locked fibre laser via instabilities

a Dispersive Fourier transform (DFT) spectra with the dark-red line represent pulse intensity dynamics. b Real-time central wavelength offset from 1555 nm, defined by the discrepancy between the central wavelength of the DFT spectra and spatio-temporal dynamics.