Negative Nonlinear Absorption Effect in Erbium Doped Fibers.

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  • Maeda Yoshinobu
    Department of Information and Control Engineering, Toyota Technological Institute, 2–12–1 Hisakata, Tempaku, Nagoya 468, Japan
  • Sakakibara Takao
    Department of Information and Control Engineering, Toyota Technological Institute, 2–12–1 Hisakata, Tempaku, Nagoya 468, Japan
  • Migitaka Masatoshi
    Department of Information and Control Engineering, Toyota Technological Institute, 2–12–1 Hisakata, Tempaku, Nagoya 468, Japan

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  • Negative Nonlinear Absorption Effect in

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The dependence of the negative nonlinear absorption effect on both modulation degree and modulation frequency of an incident laser was investigated in erbium-doped fibers at 77 K. Negative input-output characteristics were obtained at modulation frequencies of 10 to 250 kHz for fiber lengths above 2 m. The maximum ratio of the transmitted modulation degree to the incident one was approximately -2 for a fiber length of 4 m. It is suggested that emissions induced in the fiber can contribute to the negative nonlinear absorption effect because they propagate with low loss.

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