We experimentally demonstrate a novel approach to generate a multi-frequency comb light source with a high mutual coherence in an all-fiber system. Starting from EOM combs, we exploit spatial light multiplexing in a 3-core all-normal nonlinear silica fiber at 1550 nm. Each pulse propagates in its own core to experience a nonlinear broadening but within the same fiber. We obtained 3 almost similar output flat-top spectra spanning over 14 nm with 3 nJ per pulse at 250 MHz and a flat phase noise spectrum down to -125 dBc/Hz. The signal-to-noise ratio of interferograms is about 40 dB.
KEYWORDS: Modulation, Signal to noise ratio, Frequency combs, Phase shift keying, Reflectometry, Heterodyning, Energy transfer, Signal attenuation, Picosecond phenomena, Oscillators
We experimentally investigate the noise-driven thermalization of the Fermi Pasta Ulam Tsingou (FPUT) recurrences. In fiber optics, such dynamic is observed when the spontaneous modulation instability (MI), generating noise floor amplification, is able to compete with seeded MI, at the origin of the coherent energy transfers between the Fourier modes. An input noise tuning setup is implemented, combined with a heterodyne time domain reflectometer which allows to record the power and phase distributions of the Fourier modes. By also recording the fiber output spectra, we highlight a progressive loss of the process coherence and the breakup of the FPUT recurrences.
We report a novel experimental setup to perform distributed characterization in intensity and phase of the nonlinear stage of modulation instability by means of a non-invasive experimental setup : a heterodyne time domain reflectometer.
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