[1] Zhong K P, Zhou X, Huo J H et al. Digital Signal Processing for Short-reach Optical Communications: A Review of Current Technologies and Future Trends[J]. Journal of Lightwave Technology, 36, 377-400(2018).

[2] Zhong K. Experimental Demonstration of 500 Gbit/s Short Reach Transmission Employing PAM4 Signal and Direct Detection with 25 Gbps Device[C], Th3A.3(2015).

[3] Nikolaos-Panteleimon D, Wataru K, Hidetaka N et al. Amplifierless PAM-4/PAM-8 Transmissions in O-band Using a Directly Modulated Laser for Optical Data-center Interconnects[J]. Optics Letters, 44, 9-12(2019).

[5] Li F, Zou D D, Sui Q et al. Optical Amplifier Free 100 Gbit/s/Lamda PAM-W Transmission and Reception in O Band over 40 km SMF with 10 G Class DML[C], Tu2F.4(2019).

[6] Feng N, Ju C, Lian B. Advanced Modulation and Equalization Schemes for Optical Short to Medium Reach DD Link[J]. Study on Optical Communications, 1-12(2021).

[7] Zou D D, Li F, Li Z B et al. 100 G PAM6 and PAM8 Signal Transmission Enabled by Pre-chirping for 10 km Intra-DCI Utilizing MZM in C Band[J]. Journal of Lightwave Technology, 38, 3445-3453(2020).

[8] Devaux F, Sorel Y, Kerdiles J F. Simple Measurement of Fiber Dispersion and of Chirp Parameter of Intensity Modulated Light Emitter[J]. Journal of Lightwave Technology, 11, 1937-1940(1993).

[9] Kaneda N, Lee J, Chen Y K. Nonlinear Equalizer for 112 Gb/s SSB-PAM4 in 80 km Dispersion Uncompensated Link[C], Tu2D.5(2017).

[10] Zhu M Y, Zhang J, Yi X 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).

[11] Chen H Y, Kaneda N, Lee J et al. Optical Filter Requirements in an EML-based Single-sideband PAM4 Intensity-modulation and Direct-detection Transmission System[J]. Optics Express, 25, 5852-5860(2017).

[12] 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).

[13] Zhu M Y, Zhang J, Yi X et al. Optical Single Side-band Nyquist PAM-4 Transmission Using Dual-drive MZM Modulation and Direct Detection[J]. Optics Express, 26, 6629-6638(2018).

[14] Bo T W, Kim H. Generalized Model of Optical Single Sideband Generation Using Dual Modulation of DML and EAM[J]. Optics Express, 28, 28491-28501(2020).

[15] Peng W R, Wu X X, Feng K M et al. Spectrally Efficient Direct-detected OFDM Transmission Employing an Iterative Estimation and Cancellation Technique[J]. Optics Express, 17, 9099-9111(2009).

[16] Randel S, Pilori D, Chandrasekhar S et al. 100-Gb/s Discrete-multitone Transmission over 80 km SSMF Using Single-sideband Modulation with Novel Interference-cancellation Scheme[C], 7341665(2015).

[17] Zou K H, Zhu Y X, Zhang F et al. 1.2 Tb/s (12×100 Gb/s) Nyquist 32-QAM Subcarrier Modulation WDM Transmission with Direct Detection[C], AM4A.4(2015).

[18] Mecozzi A, Antonelli C, Shtaif M. Kramers-kronig Coherent Receiver[J]. Optica, 3, 1220-1227(2016).

[19] Bo T, Kim H. Kramers-kronig Receiver Operable without Digital Upsampling[C], 17856137(2018).

[20] Patel R K, Alimi I A, Muga N J et al. Optical Signal Phase Retrieval with Low Complexity DC-value Method[J]. Journal of Lightwave Technology, 38, 4205-4212(2020).

[21] Ishimura S, Kao H, Yanaka K et al. SSBI-free Direct-fetection System Employing Phase Modulation for Analog Optical Links[J]. Journal of Lightwave Technology, 38, 2719-2725(2020).

[22] Peng W R, Morita I, Tanaka H. Enabling High Capacity Direct-detection Optical OFDM Transmissions Using Beat Interference Cancellation Receiver[C], 5621488(2010).

[23] An S H, Zhu Q M, Li J C et al. Modified KK Receiver with Accurate Field Reconstruction at Low CSPR Condition[C], M1H.3(2019).

[24] Li Z, Erkilinç M S, Maher R et al. Two-stage Linearization Filter for Direct-detection Subcarrier Modulation[J]. IEEE Photonics Technology Letters, 28, 2838-2841(2016).

[25] Li Z, Erkilinç M S, Pachnicke S et al. Direct-detection 16-QAM Nyquist-shaped Subcarrier Modulation with SSBI Mitigation[C], 7249150(2015).

[26] Ju C, Liu N, Chen X et al. SSBI Mitigation in a RF-tone-based VSSB-OFDM System with a Frequencydomain Volterra Series Equalizer[J]. Journal of Lightwave Technology, 33, 4997-5006(2015).

[27] Li Z, Erkılınç M S, Shi K et al. Spectrally Efficient 168 Gb/s/λ WDM 64-QAM Single-sideband Nyquist-subcarrier Modulation with Kramers–kronig Direct-detection Receivers[J]. Journal of Lightwave Technology, 36, 1340-1346(2018).

[28] Lu D X, Zhou X, Hou J H et al. Theoretical CSPR Analysis and Performance Comparison for Four Single-sideband Modulation Schemes with Kramers-kronig Receiver[J]. IEEE Access, 7, 166257-166267(2019).

[29] Erkılınç M S, Li Z, Pachnicke S et al. Spectrally Efficient WDM Nyquist Pulse-shaped 16-QAM Subcarrier Modulation Transmission with Direct Detection[J]. Journal of Lightwave Technology, 33, 3147-3155(2015).

[30] Zhu Y X, Zou K H, Chen Z Y et al. 224 Gb/s Optical Carrier-assisted Nyquist 16-QAM Half-cycle Single-sideband Direct Detection Transmission over 160 km SSMF[J]. Journal of Lightwave Technology, 35, 1557-1565(2017).

[31] Chen X, Antonelli C, Chandrasekhar S et al. Kramers-kronig Receivers for 100 km Datacenter Interconnects[J]. Journal of Lightwave Technology, 36, 79-89(2018).

[32] Antonelli C, Mecozzi A, Shtaif M et al. Polarization Multiplexing with the Kramers-kronig Receiver[J]. Journal of Lightwave Technology, 35, 5418-5424(2017).

[33] Li Z, Erkılınç 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).

[34] Sun C, Che D, Shieh W. Comparison of Chromatic Dispersion Sensitivity between Kramers–kronig and SSBI Iterative Cancellation Receiver[C], W4E.4(2018).

[35] Schmidt B J C, Zan Z, Du L B et al. 120 Gbit/s over 500-km Using Single-band Polarization-multiplexed Self-coherent Optical OFDM[J]. Journal of Lightwave Technology, 28, 328-335(2010).

[36] Füllner C, Wolf S, Kemal J N et al. Transmission of 80 GBd 16-QAM over 300 km and Kramers-kronig Reception Using a Low-complexity FIR Hilbert Filter Approximation[C], W4E.3(2018).

[37] Bo T W, Kim H. Towards Practical Kramers-kronig Receiver: Resampling, Performance, and Implementation[J]. Journal of Lightwave Technology, 37, 461-469(2019).

[38] Zhang L, Zuo T J, Mao Y et al. Beyond 100-Gb/s Transmission over 80 km SMF Using Direct-detection SSB-DMT at C-band[J]. Journal of Lightwave Technology, 34, 723-729(2016).