Fig. 1. Schematic diagrams of photon demodulation based on DP-MZM and spectra of different stages. (a) Diagram of frequency spectrum of wireless millimeter wave signal after up-conversion; (b) diagram of millimeter wave signal spectrum after DP-MZM; (c) diagram of millimeter wave signal spectrum after TOF; (d) schematic diagram of photon demodulation

Fig. 2. Experimental setup for real-time delivery of 125.52 Gbit/s PDM-QPSK signals in RoF network and signal spectra with 0.02 nm resolution. (a) Experimental setup; signal spectra after (b) QPSK hybrid mixer, (c) DP-MZM, and (d) filtering of tunable filter

Fig. 3. Experimental test results of 22 GHz PDM-QPSK signal. (a) Relation between BER of PDM-QPSK signal and received optical power; (b) X- polarization and (c) Y- polarization PDM-QPSK signal constellations processed by real-time coherent receiver

Fig. 4. Experimental test results of 60 GHz PDM-QPSK signal. (a) Relation between BER of PDM-QPSK signal and received power; (b) relation between BER of PDM-QPSK signal and RoF carrier frequency; (c) experimental diagram of wireless link transmittance and receiving