Optical multistability generation via cavity series

We investigated a different approach to establish an optical multistability (OM) in quantum atomic systems. It is demonstrated that using two cavities in series configuration leads to a more flexible OM. The number of output intensities can be further than usual and each branch of OM diagram is controllable. In addition, we have specified necessary conditions to achieve this flexible OM. It is shown that the OM threshold and even the lengths of branches are adjustable.