A parity-time-symmetric optoelectronic oscillator with polarization multiplexed channels

In this manuscript, we experimentally demonstrate a parity-time-symmetric optoelectronic oscillator (OEO) with polarization multiplexed channels. We obtained a microwave single-mode oscillation at 9.5 GHz with phase noise values of -116.2 and -122.3 dBc Hz(-1) at 10 kHz offset frequencies, and side mode suppression values below -68 and -75 dBc Hz(-1), by utilizing a 1 km long and 5 km long single mode fiber delay lines, respectively. Our experimental results suggest that parity-time-symmetric OEOs with polarization multiplexed channels are simple and cost-efficient alternatives to their more complex counterparts.