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Evolution of the mid-infrared higher-order soliton fission in a tapered tellurite microstructured optical fiber

The novel property of the mid-infrared (MIR) higher-order soliton fission in a tapered tellurite microstructured optical fiber (TMOF) is experimentally investigated. The TMOF is tapered to offer an ideal environment for the formation of optical solitons. From ∼30 to 80 mW, the redshift of the first fundamental soliton (SSFS) is obvious. From ∼80 to 120 mW, two fundamental solitons are obtained by the fission of the higher-order solitons. The redshift of the first fundamental soliton almost stops because the increased pump power is preferentially distributed to the second fundamental soliton. From ∼120 to 180 mW, obvious redshift of the first fundamental soliton is observed again, and a third fundamental soliton is obtained at ∼180 mW. With the average pump power increasing to ∼220 mW, five fundamental solitons are observed.