[1] [1] Udalcovs A, Levantesi M, Urban P, et al. Total cost of ownership of digital vs. analog radio-over-fiber architectures for 5G fronthauling[J]. IEEE Access, 2020, 8: 223562-223573.

[2] [2] Deng M L, Mamadou T, Xing Z B, et al. Digital orthogonal filtering-enabled synchronous transmissions of I/Q waveforms and control words for bandwidth-efficient and low-complexity mobile fronthaul[C]//2021 Optical Fiber Communications Conference and Exhibition (OFC). IEEE, 2021: 1-3.

[3] [3] Torres-Ferrera P, Straullu S, Abrate S, et al. Upstream and downstream analysis of an optical fronthaul system based on DSP-assisted channel aggregation[J]. Journal of Optical Communications and Networking, 2017, 9(12): 1191-1201.

[4] [4] Li P, Pan W, Zou X, et al. Low-complexity adaptive frequency-domain nonlinear equalization for analog RoF mobile fronthaul using FFT/IFFT-assisted channel aggregation[J]. Journal of Lightwave Technology, 2022, 40(4): 1072-1082.

[5] [5] Noor S, Assimakopoulos P, Wang M, et al. Comparison of digital signal processing approaches for subcarrier multiplexed 5G and beyond analog fronthaul[J]. Journal of Optical Communications and Networking, 2020, 12(3): 62-71.

[6] [6] Li W, Zhu N H, Wang L X, et al. Broadband phase-to-intensity modulation conversion for microwave photonics processing using Brillouin-assisted carrier phase shift[J]. Journal of Lightwave Technology, 2011, 29(24): 3616-3621.

[7] [7] Wu R, Jiang T, Yu S, et al. Multi-order nonlinear distortions analysis and suppression in phase modulation microwave photonics link[J]. Journal of Lightwave Technology, 2019, 37(24): 5973-5981.

[8] [8] Chi H, Zou X, Yao J. Analytical models for phase-modulation-based microwave photonic systems with phase modulation to intensity modulation conversion using a dispersive device[J]. Journal of Lightwave Technology, 2009, 27(5): 511-521.

[9] [9] Fujimoto D, Lu H H, Kumamoto K, et al. Phase-modulated hybrid high-speed Internet/WiFi/pre-5G in-building networks over SMF and PCF with GI-POF/IVLLC transport[J]. IEEE Access, 2019, 7: 90620-90629.

[10] [10] de Tarso Neves Junior P, Vieira L C, de Almeida Prado Pohl A. Optical OFDM transmission based on phase modulation and fiber Bragg grating[C]//2023 International Conference on Optical MEMS and Nanophotonics (OMN) and SBFoton International Optics and Photonics Conference (SBFoton IOPC), IEEE, 2023: 1-2.

[12] [12] Urick V J, Bucholtz F, McKinney J D, et al. Long-haul analog photonics[J]. Journal of Lightwave Technology, 2011, 29(8): 1182-1205.