Observation of stable bound soliton with dual-wavelength in a passively mode-locked Er-doped fiber laser
Zheng Yu, Tian Jin-Rong, Dong Zi-Kai, Xu Run-Qin, Li Ke-Xuan, Song Yan-Rong
       

(color online) Spectrum of the dual-wavelength output at the pump power of 188 mW.