  The interaction between light and mechanical vibrations in a cavity is often
exploited to produce higher order sidebands (HOS) /combs, which are used in
optical communication networks, spectroscopy, and others. Although a
considerable study of optomechanically induced HOS has been done, its proper
control and manipulation using only continuous wave (CW) laser drive are still
to be explored. Here, we employed mechanical Parity-Time (PT) Symmetric
structure with optically induced gain and loss. It has allowed us to manipulate
the flow of mechanical energies (phonons) between the cavities, which has
consequences on the optical response of the cavities. Based on our numerical
investigations, we found that the higher order optical sidebands start to
emerge by breaking PT symmetry. We precisely controlled the number of higher
order sideband lines by adjusting the coupling rate between the cavities with
fixed drive power. In addition, we observe that the Exceptional Point (EP)
induces the formation of two synchronized higher order optical sideband
spectra, which opens a promising EP based platform towards realization of
optical readout of various mechanical synchronization phenomena, memory
applications, sensing, synchronization of remote clock time and others.
