Tunable narrow linewidth 1.5 μm fiber laser using a π phase-shifted FBG
Here we demonstrate, to the best of our knowledge, a tunable 1.5 μm narrow linewidth fiber ring laser using a temperature tuning π-phase shifted fiber Bragg grating (π-PSFBG) for the first time. The π-PSFBG is employed as both a narrow band filter and a wavelength tuning component by a thermo electric cooler (TEC). The tuning range of the laser is 1.29 nm with the precision of 14 pm/°C, and the maximum output power is 1.1 W with a linewidth of 2.57pm, and the slope efficiency is about 12.2%.