We theoretically show that low amplitude coherently coupled bright and dark spatial soliton pairs can be realized in biased guest–host photorefractive polymers under steady-state conditions. These soliton pairs are predicted for the carrier beams sharing the same polarization, wavelength, and having a definite mutual phase difference. An exact analytical solution for the bright and dark coherent soliton pair is obtained based on the coupled paraxial Helmholtz equation considering the nonlinearity of the photorefractive polymer. We systematically investigate the functional dependence of the coherently coupled soliton pair’s FWHM with respect to firstly, the mutual phase difference and the secondly, the beam intensity ratio for different external bias fields. We find the existence of bistable states in case of the dark coherently coupled soliton pair.
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