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Dark vector solitons of the coupled higher-order nonlinear Schrödinger equations, which describe the ultrashort pulse propagation in the birefringent or two-mode fiber, are investigated. By means of the Hirota method, we construct the anti-dark, dark single- and double-hump vector soliton solutions. Parametric regions for the existence of such vector soliton solutions are given, which are related...
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