According to the filter response analysis of the all-pass waveguide micro-ring, the notch filtering function can be achieved when the relationship between the coupling coefficient and the round trip loss meets the critical coupling condition. The micro-ring resonator based on polymer polysiloxane-liquid (PSQ-L) racetrack waveguide is designed and fabricated. With its notch filtering function, the power fading effect induced by the dispersion is suppressed effectively and the quasi-single sideband light-wave carried radio frequency (RF) signal of 14.35 GHz is transmitted through 25 km single mode fiber successively. To improve the flexibility of notch filtering, the conventional direction coupler is substituted with a Mach-Zehnder interferometer (MZI). The micro-ring coupling states, such as over, critical, and under coupling, and the resonant wavelength are tuned agilely by altering the power applied to the heating electrodes on the arm of MZI and the ring waveguide. The maximum notch depth is 12 dB, and the wavelength tuning efficiency is 8.2 pm/mW.