Low-threshold wavelength-switchable photonic crystal fiber laser based on superimposed fiber Bragg gratings

摘要

We report a wavelength-switchable photonic crystal fiber laser based on superimposed fiber Bragg gratings with a low threshold. Quadruple superimposed fiber Bragg gratings are fabricated in a photosensitive PCF and inserted between small core erbium-doped PCF and step-index fiber, which reduce the intracavity loss below 2 dB. Four wavelength switching stable outputs are obtained, and the lowest threshold power is only similar to 0.85 mW with a slope efficiency of similar to 13.3% correspondingly.