Optical High-Order Sideband Comb Generation in a Photonic Molecule Optomechanical System

An optical high-order sideband comb generation scheme is theoretically and numerically studied in a photonic molecule optomechanical system. The photonic molecule optomechanical system consists of two directly coupled optical microcavities with one cavity of the molecule supports a mechanical mode. The system is coherently driven by an input two-tone laser, which consists of a continuous-wave coupling field and an intense continuous-wave pump field. Based on the nonlinear effect of high-order sideband generation in the nonperturbative regime, the optical high-order sideband combs consisting of equally spaced spectral lines in frequency space can be generated in both cavities of the molecule. This paper reveals that the comb generation is associated with the cavity-cavity coupling strength, and the comb generation and manipulation in a controlled way might be achieved using the proposed setup.