The squeezing direction of the quadrature squeezed state is highly compatible with the quadrature amplitude modulation in classical communication, making the quantum communication protocol based on the quadrature squeezed state easier to implement and commercialize. Here, we experimentally prepare a 200 MHz broadband quadrature squeezed state corresponding to the optical fiber communication window. First, we construct an optical parametric amplifier with a cavity length of 8 mm and a full width at a half maximum of 210 MHz. Then, we develop a 1‒300 MHz low-noise balanced homodyne detector with a common-mode rejection ratio of up to 50 dB. Finally, we obtain a quadrature amplitude squeezed state with a bandwidth of 200 MHz at a wavelength of 1.3 μm, providing the necessary quantum light source for high-speed quantum communication.