Fig. 1. Principle of D-band mm-wave vector signal generation based on an intensity modulator. (a) Principle of mm-wave vector signal generation; (b) precoding RF signal generation

Fig. 2. Even-order Bessel function curves (The upper right diagram shows the power points of the MZM, and the lower right diagram shows the D-band millimeter wave signal generation after passing through the photon mixer)

Fig. 3. Experimental setup and photos of the D-band signal based on IM. (a) Experimental setup; (b) photo of the transmission system; (c) photo of the transceiver ends; (d) photo of the receiver end

Fig. 4. Original and precoded constellations for signal at the transmitter. (a) Original constellation; (b) constellation after precoding

Fig. 5. Optical spectrum of the optical signals after MZM

Fig. 6. BER change with input power into PM for 152 GHz 4 GBaud QPSK signal and spectrum of the 40 GHz IF signal. (a) BER of QPSK signal versus input power into PM; (b) spectrum of the 40 GHz IF signal

Fig. 7. Constellations for QPSK signal at the receiver. (a) Received signal; (b) signal after double oversampling; (c) signal after CMA and post-equalization; (d) signal after frequency offset estimation; (e) signal after carrier phase estimation