Fig. 1. Diagram of coupling system between fibers and WRR

Fig. 2. (a) Sectional view of silicon nitride WRR coupling section; (b) Ex of the symmetric mode; (c) Ex of the antisymmetric mode

Fig. 3. (a) Schematic of the superposition of the resonances of the Fabry-Perot cavity and the ring resonator; (b) effect of the end-face reflection on the resonance curve; (c) influence of the normal mode on the resonance curve; (d) influence of the combination of end-face reflection and coupler mode on resonance curves

Fig. 4. Schematic of the measurement system

Fig. 5. (a) Experimental data and fitting of the first silicon nitride WRR; (b) experimental data and fitting of the second silicon nitride WRR