  We explore theoretically the optical response properties in an optomechanical
system under electromagneti- cally induced transparency condition but with the
mechanical resonator being driven by an additional coherent field. In this
configuration, more complex quantum coherent and interference phenomena occur.
In partic- ular, we find that the probe transmission spectra depend on the
total phase of the applied fields. Our study also provides an efficient way to
control propagation of amplification.
