The present invention relates to a wavelength-strained soliton fiber laser, comprising: an optical pump for emitting light that excites a gain medium for oscillation of light waves;;A nonlinear amplified loop mirror for generating light waves of a predetermined wavelength using light emitted from the optical pumping laser; A linear loop mirror in which the light waves oscillated in the nonlinear amplified loop mirror are mode locked to generate a soliton pulse; And a second optical fiber directional coupler connected between the nonlinear amplified loop mirror and the linear loop mirror to couple the light waves generated by the nonlinear amplified loop mirror to the linear loop mirror. In the laser composition, it is possible to oscillate soliton pulses for the oscillating wavelength of the gain medium by a simple method.
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