Observation of wavelength-switchable solitons in an all-polarization-maintaining erbium-doped fiber cavity based on graphene saturable absorber reflector
RF spectra of the PM erbium-doped fiber laser mode-locked at the central wavelengths of 1531.6 nm (red) and 1557.8 nm (black). The inset shows the spectral harmonics at a span of 5 GHz.
