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Stable dark solitons in PT-symmetric dual-core waveguides

We construct dark solitons in the recently introduced model of the nonlinear dual-core coupler with the mutually balanced gain and loss applied to the two cores, which is a realization of parity-time symmetry in nonlinear optics. The main issue is stability of the dark solitons. The modulational stability of the CW (continuous-wave) background, which supports the dark solitons, is studied analytically, and the full stability is investigated in a numerical form, via computation of eigenvalues for modes of small perturbations. Stability regions are thus identified in the parameter space of the system, and verified in direct simulations. Collisions between stable dark solitons are briefly considered too.

preprint2012arXivOpen access
Yuliy V. BludovVladimir V. KonotopBoris A. Malomed
nlin.PSphysics.optics
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Yuliy V. BludovVladimir V. KonotopBoris A. Malomed

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