Phase noise properties of supercontinuum generation in all-normal dispersion fibers

The spectral coherence properties of supercontinuum generation in polarization-maintaining all-normal dispersion fibers are investigated. Stochastic phase noise induced by energy fluctuations, along with spectrally resolved intensity-to-phase transfer coefficients, is quantitatively analyzed, confirming the high coherence of the generated supercontinuum. Our results show that the nonlinear process is fundamentally deterministic with ultra-low spectral phase noise yet exhibits significant intensity-to-phase coupling.