Haiping Song, Chuanming Huang, Hugui Jin, Mengfan Cheng, Deming Liu, Lei Deng. High-Speed, Coherent, Beyond-5G Fronthaul System Based on DSP-Free Remote Antenna Unit[J]. Chinese Journal of Lasers, 2022, 49(12): 1206005
- Chinese Journal of Lasers
- Vol. 49, Issue 12, 1206005 (2022)
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 Vpp of I(t) when only LSB signal is transmitted; (c) change IQ skew when only USB signal is transmitted; (d) change Vpp of I(t) when only USB signal is transmitted
Fig. 10. SSR curves. (a) SSR results versus IQ skew; (b) SSR results versus Vpp 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) RBER 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]
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Table 1. Comparison of multiple analog millimeter-wave over fiber mobile fronthaul systems based on self-heterodyne coherent detection technique
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Table 2. Signal carrier frequency in AWG and frequency of RF source
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