Abstract
• Quadruple superimposed FBGs are fabricated in a homemade photosensitive PCF. • A four-wavelength switchable PCF laser with stable output is demonstrated. • With optimized PCF and splicing, the laser has a low threshold power of ~0.85 mW. 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 ∼0.85 mW with a slope efficiency of ∼13.3% correspondingly.
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