<p>We theoretically investigate the enhanced generation of the optical second-order sidebands (OSS) in a DPA-assisted optomechanical system. The hybrid optomechanical system is driven by a strong control field and a week probe field. Beyond the conventional linearized description of optomechanical interactions, the nonlinear interaction between the cavity field and the mechanical oscillation in this hybrid system is included in the Heisenberg–Langevin equations and is treated analytically by means of the perturbation method. In the present work, it is shown that an assisted DPA can significantly enhance the generation of the OSS. The OSS efficiency can be tuned by changing the coupling strength and phase of the DPA as well as the power of the control field. We find that the conversion efficiency of the second-order sideband in the hybrid optomechanical system with DPA is more than 10 times higher in the hybrid optomechanical system without DPA. Our device is feasible for controlling light propagation, which might have potential application in quantum optical devices and quantum information networks.</p>