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We demonstrate a method that enables accurate timing jitter spectral densitycharacterization of free-running mode-locked laser oscillators over more than10-decade of Fourier frequency from mHz to tens MHz range. The method is basedon analyzing both the input voltage noise to the slave laser and the outputvoltage noise from the balanced optical cross- correlator (BOC), when twomode-locked lasers are synchronized in repetition rate by the BOC. As ademonstration experiment, timing jitter spectrum of a free-running mode-lockedEr-fiber laser with a dynamic range of >340 dB is measured over Fourierfrequency ranging from 1 mHz to 38.5 MHz (Nyquist frequency). The demonstratedmethod can resolve different noise mechanisms that cause specific jittercharacteristics in free-running mode-locked laser oscillators for a vast rangeof time scales from <100-ns to >1000-s.

Characterization of timing jitter spectra in free-running mode-locked lasers with 340 dB dynamic range over 10 decades of Fourier frequency