Figure 1: Constant-intensity waves in a linear waveguide coupler.
From: Constant-intensity waves and their modulation instability in non-Hermitian potentials
(a) Real part (green line) and imaginary part (black line) of the complex potential V(x) satisfying equation 2 (blue filled regions depict loss, whereas the red one depicts gain). (b) Evolution of a constant amplitude without the correct phase at the input at z=0. (c,d) Spatial diffraction of the truncated constant-intensity solution satisfying the correct phase relation of equation 3. Two different input truncations are shown for comparison. The lines in the x−z planes of (b,c,d) around x=0 depict the real refractive index of the potential as shown in a. Note the different vertical axis scale in b.
