The cascaded second-order nonlinear interaction (χ (2) ) based wavelength conversions using fiber ring resonator schemes were studied both theoretically and experimentally. The schemes contain erbium doped fiber amplifiers (EDFAs), optical circulators and fiber Bragg gratings exclusively as a pump source, with excellent characteristics such as high black-box conversion efficiency and strong pump light confinement. It is shown that a maximum black-box conversion efficiency of −10 dB can be obtained by using an EDFA with a saturation power of only 16 dBm and a quasiphase matched waveguide with a nonlinear conversion efficiency of 280%/W. The standard and black-box conversion efficiencies, and ring structure design were also investigated and compared theoretically based on three kinds of ring resonator configurations. The analysis provides a guideline for optimizing wavelength conversion efficiency based on the proposed ring resonators.