Observation of wavelength-switchable solitons in an all-polarization-maintaining erbium-doped fiber cavity based on graphene saturable absorber reflector**Project supported by the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. PCSIRT: 1212), the Key Grant Science and Technology Planning Project of Beijing, China (Grant Nos. PXM2013_014224_000077 and PXM2012_014224_000019), and the Science and Technology Planning Project of Beijing Municipal

Abstract

We present the generation of wavelength-switchable single-polarization solitons in an all-polarization-maintaining erbium-doped fiber laser mode-locked by a graphene saturable absorber. Ultrashort pulses centered at the wavelength of 1531.6 nm with the duration of 816 fs and centered at the wavelength of 1557.8 nm with the duration of 402 fs are separately obtained from the same fiber laser cavity. The cavity loss adjusted by the gold reflector plays a crucial role in wavelength switching.