Our previous work had proved pump field noise coupling in the seed field injected optical parametric amplifier[OPA]at a certain analysis frequency.Inspired by this noise coupling mechanism,the frequency dependent squeezing factor due to excess pump noise was experimentally demonstrated.Apart from a reduced squeezing level with an increased noise,the results also prove that a broadband squeezing noise spectrum is not frequency dependent on the amplitude modulated pump field,but limited by the bandwidth of the amplitude modulator and OPA resonator,and the effective measurement is carried out in the frequency range of 2-10 MHz.It provides a guidance to design a broader-bandwidth,higher-level bright squeezed light.