All-fiber dual-wavelength laser delivering two types of solitons

We have proposed a compact all-fiber dual-wavelength laser based on a fiber Bragg grating (FBG) and semiconductor saturable absorber mirror (SESAM). The proposed laser mode locked by single-walled carbon nanotubes (SWNTs) delivers two kinds of solitons with pulse durations of similar to 1 ps and similar to 20 ps. The spectral width of the longer soliton pulses is similar to 0.14 nm, which attributes to the narrow bandwidth of the FBG. Shorter pulses with a spectral width of similar to 4 nm are mainly determined by the cavity length and intracavity dispersion. Our method provides a simple, stable, low-cost, and dual-scale ultrafast-pulsed laser source suitable for practical applications in optical communications and sensing.