%Ring resonator based coupler based on current literature and RSoft Simulator:: \OIL 017 coupler ring 2 \LAYER1 MAT:SI THI:5um IND:3.46 \END LAYER1 \LAYER2 MAT:SIO2 THI:1um IND:1.46 \END LAYER2 \LAYER3 MAT:SI THI:0.25um WID:5.0um LEN:5.0um IND:3.46 BR:2.0um CG:0.2um CL:0.5dB PL:0.01dB \END LAYER3 \TOP WID:5.0um LEN:5.0um THI:6.25um BR:2.0um CG:0.2um CL:0.5dB PL:0.01dB \END TOP