[1] Safi H, Montazeri A M, Rostampoor J et al. Spectrum sensing and resource allocation for 5G heterogeneous cloud radio access networks[J]. IET Communications, 16, 348-358(2022).

[2] López-Benítez M, Raschellà A, Pizzi S et al. Smart spectrum and radio resource management for future 5G networks[J]. Computer Networks, 193, 108089(2021).

[3] Okazaki H. FOREWORD: special section on microwave and millimeter wave technologies[J]. IEICE Transactions on Electronics, E103-C, 396(2020).

[4] Li X Y, Yu J J, Chang G K. Photonics-aided millimeter wave technologies for extreme mobile broadband communications in 5G[J]. Journal of Lightwave Technology, 38, 366-378(2020).

[5] Wang W Z, He S W, Wu Y P et al. Performance evaluation and analysis of millimeter wave communication system[J]. IEEE Systems Journal, 13, 159-170(2019).

[6] Li X, Zhang C L, Wang H. 16QAM/OFDM-RoF system based on probabilistic shaping[J]. Laser＆Optoelectronics Progress, 58, 0906008(2021).

[7] Li W P, Kong M, Shi J T et al. Multiple radio frequency operation based on a modulator in a radio-over-fiber system[J]. Chinese Journal of Lasers, 47, 1106002(2020).

[8] Yu J J, Dong Z, Chi N. 1.96 Tb/s (21×100 Gb/s) OFDM optical signal generation and transmission over 3200-km fiber[J]. IEEE Photonics Technology Letters, 23, 1061-1063(2011).

[9] Yu J J, Dong Z, Chien H C et al. 7-Tb/s (7×1.284 Tb/s/ch) signal transmission over 320 km using PDM-64QAM modulation[J]. IEEE Photonics Technology Letters, 24, 264-266(2012).

[10] Ma Z Y, Wu Q Q, Li Q H et al. Ultra-dense wavelength division multiplexing passive optical network[J]. Laser＆Optoelectronics Progress, 58, 0500006(2021).

[11] Ma J X, Zhang R J, Li Y J et al. Full-duplex RoF link with broadband mm-wave signal in W-band based on WDM-PON access network with optical mm-wave local oscillator broadcasting[J]. Optics Communications, 336, 248-254(2015).

[12] Liu A L, Yin H X, Wu B. High-efficient full-duplex WDM-RoF system with sub-central station[J]. Optics Communications, 414, 72-76(2018).

[13] Zhang L, Hu X F, Cao P et al. Simultaneous generation of independent wired and 60-GHz wireless signals in an integrated WDM-PON-RoF system based on frequency-sextupling and OCS-DPSK modulation[J]. Optics Express, 20, 14648-14655(2012).

[14] Pang X D, Beltrán M, Sanchez Vilchez J et al. Centralized optical-frequency-comb-based RF carrier generator for DWDM fiber-wireless access systems[J]. Journal of Optical Communications and Networking, 6, 1-7(2014).

[15] Gao J P, Zhao M M, Lu J et al. Wide optical frequency comb system based on single intensity modulator[J]. Laser＆Optoelectronics Progress, 58, 0913001(2021).

[16] Das B, Mallick K, Mandal P et al. Flat optical frequency comb generation employing cascaded dual-drive Mach-Zehnder modulators[J]. Results in Physics, 17, 103152(2020).

[17] Zhang C, Ning T G, Li J et al. A full-duplex WDM-RoF system based on tunable optical frequency comb generator[J]. Optics Communications, 344, 65-70(2015).

[18] Li X Y, Yu J J. W-band RoF transmission based on optical multi-carrier generation by cascading one directly-modulated DFB laser and one phase modulator[J]. Optics Communications, 345, 80-85(2015).

[19] Zhou H, Fei C Y, Zeng Y T et al. A ROF system based on 18-tuple frequency millimeter wave generation using external modulator and SOA[J]. Optical Fiber Technology, 61, 102402(2021).

[20] Di H, Chen X Q, Liu X R et al. Carrier reuse technology based on double amplitude modulation in RoF system[J]. Optical Communication Technology, 45, 47-50(2021).

[21] Zhang Y J. The research of single sideband suppression for ROF communication system[D](2013).

[22] Wang X B, Lu Z J, Lü M Q et al. Optical single sideband full-duplex RoF system with continuously tunable optical carrier-to-sideband ratio[J]. Journal of Microwaves, 37, 89-94(2021).

[23] Liu T T. Research on technique of millimeter wave generation with high and tunable frequency multiplication factor based on OCS[D](2019).

[24] Xiao Z L. Millimeter wave generation methods based on external intensity modulator[D](2014).

[25] Lu M T. Research on generating structure of multi-carrier light source used in DWDM-ROF system[D](2018).

[26] Zhang Q Y, Zhang C F, Chen C et al. Multi-service radio-over-fiber system with multiple base-station groups enabled by scalable generation of multi-frequency MMWs[J]. Optics Communications, 324, 120-126(2014).

[27] Shen C, Li P L, Zhu X Y et al. Ultra-flat broadband microwave frequency comb generation based on optical frequency comb with a multiple-quantum-well electro-absorption modulator in critical state[J]. Frontiers of Optoelectronics, 12, 382-391(2019).

[28] Jeong U, Lee D H, Lee K et al. Monolithic 1×8 DWDM silicon optical transmitter using an arrayed-waveguide grating and electro-absorption modulators for switch fabrics in intra-data-center interconnects[J]. Micromachines, 11, 991(2020).

[29] Sun Y. Development of polarization insensitive high-speed electro-absorption modulator[D](2001).

[30] Li Y Q, Meng X T, An Q et al. Design and implementation of electro-optic modulator adaptive polarization control system[J]. Infrared and Laser Engineering, 44, 1854-1858(2015).

[31] Xie Q. Study on the generation of Nyquist pulse based on dual parallel Mach-Zehnder modulator and the generation of flat optical frequency comb[D](2017).

[32] Xie H L, Jia K X, Chen J W et al. Tunable optical frequency comb based on coupled radio frequency signal and single Mach-Zehnder modulator[J]. Chinese Journal of Lasers, 47, 0706002(2020).

[33] Liu Y, Gao H, Chen Y et al. Full-duplex WDM-RoF system based on OFC with dual frequency microwave signal generation and wavelength reuse[J]. Optical Fiber Technology, 58, 102252(2020).