  In this letter, we investigate a Yb-doped mode-locked fiber oscillator that
uses coherent pulse division and recombination to avoid excessive nonlinear
phase shifts. The mode-locking mechanism of the laser is based on the
accumulation of a differential nonlinear phase between orthogonal polarization
modes in the polarization-maintaining fiber segment. The inserted coherent
pulse divider, based on YVO4-crystals rotated successively by 45{\deg}, enables
stable and undistorted mode-locked steady-states. The output pulse energy is
increased from 89 pJ in the non-divided operation by ~6.5 dB to more than 400
pJ with three divisions. Measurements of the amplitude-fluctuations reveal a
simultaneous broadband reduction of up to ~9 dB in the frequency range from 10
kHz to 2MHz.
