In this study, a miniaturized light source with an intensity-difference squeezed state is fabricated. The light source uses a dispersion-shifted fiber as the nonlinear medium, and its pulse pump light repetition frequency is approximately 50 MHz. The light source has a stable structure and small size. The intensity difference compression characteristics of the light source in a wide range of frequencies are measured and analyzed using a broadband wide difference detector. The results show that the intensity difference noise measured at a frequency less than 65 MHz at room temperature is lower than the shot noise limit; furthermore, the intensity difference compression at 20 MHz is about 3.8 dB. This study lays a foundation for the measurement of the intensity difference squeeze in time domain.