Fig. 1. (a) Refractive index distribution of primitive waveguide WG1; (b) refractive index distribution of WG1's SUSY partner WG2; (c) refractive index distribution of WG2's SUSY partner WG3; (d) super-potential W12 and its slope W'12; (d) super-potential W23 and its slope W'23
Fig. 3. (a) Parallel waveguides WG1 and WG2; (b) numerical simulation result of optical propagation when WG1's fundamental mode is excited; (c) numerical simulation result of optical propagation when WG2's fundamental mode is excited; (c) numerical simulation result of optical propagation when WG1's 2nd mode is excited