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. 2. (a) Primitive waveguide WG1's three bound modes; (b) WG2's two bound modes; (c) WG3's fundamental mode; (d) eigenvalues of three supersymmetric waveguides (propagation constant)

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

Fig. 4. (a) Structure of three-core coupled waveguides coupling; (b) coupling efficiency at different slant angles of intermediate waveguide

Fig. 5. Numerical simulation of adiabatic coupling. (a) From WG3 to WG1; (b) from WG2 to WG1 (with channels)

Fig. 6. Strcuture of SUSY three waveguides mode division multiplexing

Fig. 7. (a)Structure of SUSY three waveguides mode division multiplexing; (b) simulation results of propagation