Blow-up regimes in the $\mathcal{P}\mathcal{T}$- and the $\mathcal{A}\mathcal{C}$-dimer

I V Barashenkov, G S Jackson, S Flach

In the actively coupled ($\mathcal{A}\mathcal{C}$) pair of waveguides, the growth of small perturbations is saturated by the focussing nonlinearity that couples the linearly growing to the l…