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The digital back-propagation (DBP) is an algorithm that can equalize the chromatic dispersion and nonlinearity in the coherent optical fiber communication system. However, the nonlinear equalization effect of traditional split-step Fourier method (SSFM)-based DBP is limited. This paper replaces the SSFM in DBP algorithm with the fourth-order Runge-Kutta in the interaction picture (RK4IP) method, and employs the Bayesian optimization algorithm (BOA) to optimize the coefficients in RK4IP-based DBP algorithm, then compares it with SSFM-based DBP algorithm, which is also optimized using BOA.
View Article and Find Full Text PDFTransition metal phosphorus sulfides (MPS), a family of two-dimensional magnetic materials with a van der Waals structure, exhibit promising applications in nonlinear optical devices. The emergence of carrier coherence in MPS is a fascinating topic in coherently controlling the nonlinear effect (or other novel phenomena). Herein, we systematically investigated the third-order nonlinear optical responses of MPS (M = Ni, Fe, Mn) flake suspensions based on spatial self-phase modulation (SSPM) effect.
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View Article and Find Full Text PDFThe ever-increasing energy/power of modern laser sources is inevitably leading to new challenges and opportunities. One of them is the problem of spectral broadening of high-energy femtosecond pulses and their subsequent compression in time in, e.g.
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