The coupled Schodinger hierarchy associated with third-order algebraic   curves and algebro-geometric solutions
  By introducing Lenard recursion equations, we derive a general coupled nonlinear Sch$\mathrm{\ddot{o}}$dinger (CNLS) hierarchy associated with well-known Manakov system and Sasa-Satsuma system. Based on the characteristic polynomial of Lax matrix for CNLS hierarchy, we obtain a third order algebraic curve $\mathcal{K}_{m-2}$ of arithmetic genus $m-2$, from which we establish the associated Baker-Ahhiezer functions, meromorphic function and Dubrovin-type equations for analogs of Dirichlet and Neumann divisors. Using these results and the theory of algebraic curve, we obtain the explicit theta function representations of the Baker-Ahhiezer functions, the meromorphic function, and in particular, of the algebro-geometric solutions for the entire CNLS hierarchy. 
Yu Hou and Engui Fan
nlin.SI