[1] Weng Z K, Chi Y C, Wang H Y et al. 75-km long reach dispersion managed OFDM-PON at 60 Gbit/s with quasi-color-free LD[J]. Journal of Lightwave Technology, 36, 2394-2408(2018). http://8.18.37.105/abstract.cfm?uri=jlt-36-12-2394

[2] Zhou X Y, Yan L S, Yi A L et al. Polarization demultiplexing method for intensity-modulation direct-detection optical communication systems[J]. Acta Optica Sinica, 34, 1206004(2014).

[3] Zhu Y X, Ruan X K, Zou K H et al. Beyond 200G direct detection transmission with Nyquist asymmetric twin-SSB signal at C-band[J]. Journal of Lightwave Technology, 35, 3629-3636(2017). http://ieeexplore.ieee.org/document/7954577/

[4] Wei J L, Cheng Q X, Cunningham D G et al. 100-Gb/s hybrid multiband CAP/QAM signal transmission over a single wavelength[J]. Journal of Lightwave Technology, 33, 415-423(2015). http://www.opticsinfobase.org/jlt/abstract.cfm?uri=jlt-33-2-415

[5] Olmedo M I, Zuo T J, Jensen J B et al. Multiband carrierless amplitude phase modulation for high capacity optical data links[J]. Journal of Lightwave Technology, 32, 798-804(2014). http://www.opticsinfobase.org/abstract.cfm?uri=jlt-32-4-798

[6] Wang C H, Zhao G H, Chang S J. Photonic-crystal-waveguide based Mach-Zehnder interferometer for terahertz switch and modulator[J]. Acta Physica Sinica, 61, 157805(2012).

[7] Lin B J, Li J H, Yang H et al. Comparison of DSB and SSB transmission for OFDM-PON [Invited][J]. Journal of Optical Communications and Networking, 4, B94-B100(2012). http://ieeexplore.ieee.org/document/6360174/

[8] Zhao J G, Liu Z J, Liu X L et al. Optimum modulation index for single sideband radio over fiber system[J]. Acta Optica Sinica, 30, 1960-1964(2010).

[9] Zhang J W, Shao Y F, Fang W L et al. Research of single carrier frequency domain equalization based on single-sideband modulation[J]. Acta Optica Sinica, 30, 1971-1976(2010).

[10] Li J, Ning T G, Pei L et al. Optical single sideband modulation with continuously tunable optical carrier-to-sideband ratio by employing a dual-parallel Mach-Zehnder modulator[J]. Acta Physica Sinica, 62, 224210(2013).

[11] Zhu M Y, Zhang J, Yi X W et al. Hilbert superposition and modified signal-to-signal beating interference cancellation for single side-band optical NPAM-4 direct-detection system[J]. Optics Express, 25, 12622-12631(2017). http://europepmc.org/abstract/MED/28786617

[12] Mecozzi A, Antonelli C, Shtaif M. Kramers-Kronig coherent receiver[J]. Optica, 3, 1220-1227(2016).

[13] Li Z, Sezer Erkilinc M, Maher R et al. Two-stage linearization filter for direct-detection subcarrier modulation[J]. IEEE Photonics Technology Letters, 28, 2838-2841(2016). http://ieeexplore.ieee.org/document/7725980/

[14] Li Z, Erkilinc M S, Shi K et al. SSBI mitigation and the Kramers-Kronig scheme in single-sideband direct-detection transmission with receiver-based electronic dispersion compensation[J]. Journal of Lightwave Technology, 35, 1887-1893(2017). http://ieeexplore.ieee.org/document/7883836/

[15] Gao X, Xu B, Cai Y C et al. QAM modulation with single DDMZM based on direct-detection and Kramers-Kronig scheme in long reach PON[J]. Optical Fiber Technology, 48, 289-296(2019).

[16] Fan S J, Zhuge Q B. Sowailem M Y S, et al. Single wavelength twin-SSB direct detection system based on Kramers-Kronig receiver and time-interleaved OFDM frame[J]. Optics Communications, 425, 133-140(2018). http://www.onacademic.com/detail/journal_1000040371965210_547f.html

[17] Fan S J, Li Y, Xing Z P et al. Comparison of Kramer-Kronig receiver and one-stage SSBI mitigation algorithm in twin-SSB direct detection transmission systems enabled by MIMO processing[J]. Optics Communications, 434, 75-79(2019). http://www.onacademic.com/detail/journal_1000040905659410_273a.html

[18] Gao X, Xu B, Cai Y C et al. Frequency-shifted modulation using a single DDMZM and Kramers-Kronig scheme based direct detection receiver in long-reach PON. [C]//2018 Asia Communications and Photonics Conference (ACP), October 26-29, 2018, Hangzhou. New York: IEEE, 8595988(2018).

[19] Le S T, Schuh K, Chagnon M et al. 1.72-Tb/s virtual-carrier-assisted direct-detection transmission over 200 km[J]. Journal of Lightwave Technology, 36, 1347-1353(2018). http://ieeexplore.ieee.org/abstract/document/8125687/

[20] Erkilinç M S, Thakur M P, Pachnicke S et al. Spectrally efficient WDM Nyquist pulse-shaped subcarrier modulation using a dual-drive Mach-Zehnder modulator and direct detection[J]. Journal of Lightwave Technology, 34, 1158-1165(2016). http://www.opticsinfobase.org/jlt/abstract.cfm?uri=jlt-34-4-1158&origin=search

[21] Mecozzi A. Retrieving the full optical response from amplitude data by Hilbert transform[J]. Optics Communications, 282, 4183-4187(2009). http://www.sciencedirect.com/science/article/pii/S0030401809006907

[22] Yi X W, Qiu K. Estimation and compensation of sample frequency offset in coherent optical OFDM systems[J]. Optics Express, 19, 13503-13508(2011). http://europepmc.org/abstract/MED/21747505