Fig. 1. Principle of asymmetric dual single sideband modulation for co-frequency vector millimeter-wave signals generation

Fig. 2. Schematic of four independent co-frequency RF signal transmission based on polarization division multiplexing and dual single sideband modulation

Fig. 3. Scheme of four independent co-frequency millimeter-wave signals generation based on optical frequency up-conversion

Fig. 4. Schematic of crosstalk between symmetric sideband signals

Fig. 5. Crosstalk between symmetric sideband signals caused by IQ amplitude imbalance and IQ skew. (a) IQ amplitude imbalance; (b) IQ skew

Fig. 6. Crosstalk between symmetric sideband signals caused by IQ amplitude imbalance and IQ skew. (a) Theoretical result; (b) simulated result when α is 1.1 and τ is 1 ps

Fig. 7. Sideband signal spectra. (a) Before compensation; (b) after IQ amplitude imbalance compensation; (c) after IQ skew compensation; (d) after IQ amplitude imbalance and IQ skew compensation

Fig. 8. Experimental setup, optical spectra, and electrical spectra of proposed scheme. (a) Experimental setup; (b)(c) optical spectra at corresponding nodes; (d)(e) electrical spectra of detected signal

Fig. 9. Optical spectra at different conditions. (a) Change IQ skew when only LSB signal is transmitted; (b) change V_pp of I(t) when only LSB signal is transmitted; (c) change IQ skew when only USB signal is transmitted; (d) change V_pp of I(t) when only USB signal is transmitted

Fig. 10. SSR curves. (a) SSR results versus IQ skew; (b) SSR results versus V_pp of I(t)

Fig. 11. Performance of received signal. (a) EVM value versus IQ skew; (b) EVM value versus CSPR

Fig. 12. Performance of received signal. (a) R_BER performance versus ROP; (b) EVM value versus baud rate

Fig. 13. EVM performance of received signal. (a) EVM performance versus sampling rate; (b) EVM value of generated millimeter-wave signal in terms of carrier frequency of proposed scheme and previous scheme ^[26]