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We propose a nonlinear fiber system for shot-noise limited, all-opticalintensity-noise reduction and signal amplification. The mechanism is based onthe accumulation of different nonlinear phase shifts between orthogonalpolarization modes in a polarization-maintaining fiber amplifier in combinationwith an implemented sinusoidal transmission-function. The resulting correlationbetween the input intensity-fluctuations and the system transmission enablestunable intensity noise reduction of the input pulse train. In the experiment,the noise spectral density of a mode-locked oscillator is suppressed by up to~20 dB to the theoretical shot-noise limit of the measurement at -151.3 dBc/Hzwith simultaneous pulse amplification of 13.5dB.

Nonlinear Fiber System for Shot-noise Limited Intensity Noise Suppression and Amplification