  We demonstrate a continuously RF tunable orthogonally polarized optical
single sideband (OP-OSSB) generator based on dual cascaded micro-ring
resonators. By splitting the input double sideband signal into an orthogonally
polarized carrier and lower sideband via TE- and TM-polarized MRRs, an OP-OSSB
signal is generated. A large tuning range of the optical carrier to sideband
ratio of up to 57.3 dB is achieved by adjusting the polarization angle of the
input light. The operation RF frequency of the OP-OSSB generator can be
continuously tuned with a 21.4 GHz range via independent thermal control of the
two MRRs. Our device represents a competitive approach towards OP-OSSB
generation with wideband tunable RF operation, and is promising for photonic RF
signal transmission and processing in radar and communication systems.
