We present theoretical and experimental findings related to a significant increase in efficiency for the gain-through-filtering process utilized in the generation of sidebands and frequency combs within driven normal dispersion fiber cavities incorporating a slow-gain amplifier.
We predict the existence of a novel type of modulation instability within passive ring fiber Kerr cavities. This instability, which exhibits a period-4 pattern, is accessible to observation utilizing experimentally realistic parameters.
In this work, we theoretically investigate the nonlinear light dynamics in dual-core fiber passive-driven resonators. Utilizing coupled Ikeda maps and Lugiato-Lefever equations, we analyze bistability and modulation instability, unveiling notable differences from single-core fiber cavities. Specifically, we highlight the difference in modulation instability maximum gain frequency between supermodes. Our discoveries pave the way for multicore fibre cavity experimental setup design, and modelling.
We report the generation of a stable and broadband optical frequency comb featuring 28 THz bandwidth, sustained by a single 80 fs cavity soliton recirculating in a fiber Fabry-Pérot resonator. This large spectrum is comparable to frequency combs obtained with microresonators operating in the anomalous dispersion regime. Thanks to the compact design and the easy coupling of the resonator, cavity solitons can be generated in an all-fiber experimental setup with a continuous wave pumping scheme.
we investigate experimentally the phenomenon of intra-envelope four-wave mixing in optical fibers. This phenomenon arises when two lasers, having nearly identical central frequencies, interact by four wave mixing process with each other. As a result, new spectral components are created within the existing spectra. We successfully isolate these components using a third laser through a multi-heterodyne detection process.
We report the generation of optical frequency combs in fiber Fabry-Perot resonators operating in the normal dispersion regime. Thanks to the compact design and the easy coupling of the resonator, switching waves can be generated in an all-fiber experimental setup employing a pulsed pumping scheme. The influence of dispersion is thoroughly discussed, revealing the potential to create a frequency comb spanning a 15 THz bandwidth through the utilization of a flattened low dispersion cavity. The experimental results are in good agreement with the theory and the numerical simulations.
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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