Photonic-Assisted Microwave OFDM Quantum-Noise Randomized Cipher Generation via IM/DD IFoF Transmission

We propose and demonstrate an IM/DD IF-over-Fiber system that delivers and generates OFDM quantum-noise randomized cipher for secure wireless communications. A 3.6-GHz IF 4.09-Gbit/s PSK cipher with sufficient signal masking by shot noise is generated.