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Abstract

The wavelength tunable mode-locking optical fiber laser comprises non-linear amplifying loop mirror part having a light pumping lase diode, a gain medium doped optical fiber having the gain medium for oscillating the rambling light wave sequentially, a dispersion shifted optical fiber, and first polarization controller for making the continuous oscillation light wave to be maximized by adjusting the polarization of said propagating light. All elements of the non-linear amplifying loop mirror part are combined to each other in loop type on the above clock direction., and linear mirror part having second polarization controller for adjusting the light wave oscillated by the non-linear amplifying loop mirror part to be mode-locked, Faraday rotation mirror for rotating the direction of polarization with degree, an acousto-optic tunable filter for changing the wavelength of the propagating light wave and for passing only the light wave with the defined linewidth, an optical isolator, and the 90:10 optical fiber directional coupler.

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First Claim