Switching and self-trapping dynamics of Bose-Einstein solitons

We investigate the dynamics of two weakly coupled Bose condensates in long cigar-shaped traps. The Bose condensates are characterized by attractive me an-field interaction and consequently can be studied in terms of bright sol itons. We exploit the analogy with directional fibre couplers in nonlinear fibre optics to uncover interesting dynamical regimes like switching of con densates from one trap to another and self-trapping of condensates. We also discuss the analogy between two weakly coupled Bose condensates and the Jo sephson junction in superfluids and superconductors.