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In the present work, we examine "binary" waveguide arrays, where the couplingbetween adjacent sites alternates between two distinct values $C_1$ and $C_2$and a saturable nonlinearity is present on each site. Motivated by experimentalinvestigations of this type of system in fabricated LiNbO$_3$ arrays, weproceed to analyze the nonlinear wave excitations arising in theself-defocusing nonlinear regime, examining, in particular, dark solitons andbubbles. We find that such solutions may, in fact, possess a reasonably wide,experimentally relevant parametric interval of stability, while they may alsofeature both prototypical types of instabilities, namely exponential andoscillatory ones, for the same configuration. The spectral properties of thelinearization around the solutions and the presence of two bands and associatedmini-gaps are discussed and the nontrivial differences from the standard cubicdiscrete nonlinear Schr{\"o}dinger model are highlighted.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Dark lattice solitons in one-dimensional waveguide arrays with defocusing saturable nonlinearities and alternating couplings