  Dual-wavelength mode-locked fiber laser and wavelength tunable mode-locked
fiber laser have emerged as a promising light source. However, there is few
reports on generating these two output from just one laser cavity. In this
report, we demonstrate a dual-wavelength and wavelength tunable mode-locked
fiber laser output from one laser cavity by utilizing short length Lyot filter.
The central wavelengths of dual-wavelength mode-locked fiber laser are 1540 nm
and 1564 nm and the tunable laser range is about 32 nm. We believe it could
provide a simple set-up for generating dual-wavelength and wavelength tunable
mode-locked output from one laser cavity.
