  We study the optomechanically induced amplification and perfect transparency
in a double-cavity optomechanical system. We find if two control lasers with
appropriate amplitudes and detunings are applied to drive the system, the
phenomenon of optomechanically induced amplification for a probe laser can
occur. In addition, perfect optomechanically induced transparency phenomenon,
which is robust to mechanical dissipation, can be realized by the same type of
drive. These results are very important for signal amplification, light
storage, fast light and slow light in the quantum information processes.
