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arXiv · 2608.17104

Vector Akhmediev Breathers and State Transitions in the Degenerate and Nondegenerate Regimes for the Coupled Sasa-Satsuma System

Mengyuan Lan·Lei Wang·Yinchuan Zhao
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Abstract

We investigate vector Akhmediev breathers (ABs) in the degenerate and nondegenerate regimes for the coupled Sasa-Satsuma system describing two coupled ultrashort optical pulse envelopes. Based on the carrier-wavenumber relations of the two-component background, we examine three configurations: a single vanishing wavenumber, a pair of opposite wavenumbers, and two nonzero wavenumbers of unequal magnitudes. These configurations admit distinct maximal degrees of nondegeneracy. For each configuration, we derive the reduced spectral equations, construct the existence diagrams, and compare the resulting branches with the modulation-instability gain spectra. Owing to the distinct carrier-wavenumber symmetries, nondegenerate-type modes can occur in spectrally degenerate regions, whereas degenerate-type ones may also appear in spectrally nondegenerate regions. Moreover, all admissible branches in the degenerate regimes satisfy the state-transition condition and correspond to periodic-wave states, while such branches are also present in nondegenerate regimes. Direct numerical simulations of representative solutions further confirm the analytical predictions.

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Mengyuan Lan, Lei Wang, Yinchuan Zhao. 2026-08-19. Vector Akhmediev Breathers and State Transitions in the Degenerate and Nondegenerate Regimes for the Coupled Sasa-Satsuma System. https://arxiv.org/abs/2608.17104

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