Stability of self-induced transparency solitons in a resonant waveguide

Gershon Kurizki

Masataka Nakazawa, Yasuo N. Kimura, Kazunori Suzuki +2 more

The recent development of the EDFA (erbium-doped fiber amplifier) offers the possibility for uses of the fibers to experiments on coherent pulse propagation such as self-induced transparency (SIT). The guiding of the radiation by the fiber structure eliminates diffraction effects and makes possible the interaction of the radiation with the fiber medium which has resonance effects over long distances. To date, however, experiments on SIT solitons have suffered from diffraction effects that were further complicated by nonlinear interactions. In the present paper, we report for the first time the observation of SIT soliton propagation in an erbium- doped resonant fiber waveguide.

M. Romagnoli, Stefan W. Wabnitz, M. L. Zoccolotti +1 more

Victor V. Kozlov

A self-induced transparency soliton in a near-resonant two-level system exhibits properties of a nonlinear Schrödinger soliton. The interplay between near-resonant and nonresonant nonlinearities in doped fibers offers the possibility of effective control of the soliton’s parameters. As an example, it is shown that a wide range of frequencies is suitable for nonlinear Schrödinger 2π-soliton generation in semiconductors.

Guram T. Adamashvili, M. A. Meladze, N. G. McHedlishvili

Masataka Nakazawa, Yasuo N. Kimura, Kenji Kurokawa +1 more

Self-induced transparency (SIT) has been observed in an erbium-doped resonant fiber waveguide. The waveguide had an erbium ion concentration of 8900 ppm, and was cooled to 4.2 K. The pulse source was a 1.53-\ensuremath{\mu}m mode-locked Er-doped glass laser with a pulse width of 500 ps. Stable 2\ensuremath{\pi}, 4\ensuremath{\pi}, and multiple soliton pulses that broke up were clearly observed.