[1] WONG E. Survivable architectures for time and wavelength division multiplexed passive optical networks[J]. Optics Communications, 325, 152-159(2014).

[2] HAN Yishi, LUO Zhixiao, QIN Xinyu et al. Frequency-selectable and multi-channel wavelength division multiplexing radio-over-fiber system[J]. Chinese Journal of Lasers, 43, 0505007(2016).

[3] YE C, HU X, ZHANG K. Demonstration and analysis on PAM-4/8, DB-PAM-2/4 and DMT formatted TDM-PON with 25Gbps, 40Gbps, 50Gbps capacity per lane using economical 10Gbps[C], 427-429(2016).

[4] YU Jun, HUANG Mingliu, ZOU Yaozhao et al. Phase noise elimination in polarization diversity coherent optical OFDM communication system[J]. Acta Optica Sinica, 36, 0806001(2016).

[5] MECOZZI A. Nonlinear shannon limit in pseudolinear coherent systems[J]. Journal of Lightwave Technology, 30, 2011-2024(2012).

[6] LI A, CHEN X, AMIN A A et al. Space-division multiplexed high-speed superchannel transmission over few-mode fiber[J]. Journal of Lightwave Technology, 30, 3953-3964(2012).

[7] LUO J, LI J, SUI Q et al. 40 Gb/s mode-division multiplexed DD-OFDM transmission over standard multi-mode fiber[J]. IEEE Photonics Journal, 8, 7905207(2017).

[8] GNAUCK A H, ERCAN B, CHEN H et al. Photonic-lantern-based mode multiplexers for few-mode-fiber transmission[C](2014).

[9] ESMAEELPOUR M, RYF R, TOULOUSE J et al. Transmission over 1050-km few-mode fiber based on bidirectional distributed raman amplification[J]. Journal of Lightwave Technology, 34, 1864-1871(2016).

[10] RYF R, FONTAIN N K, CHEN H et al. 72 Tb/s transmission over 179km all-fiber 6 mode span with two cladding pumped in-line amplifiers[C](2015).

[11] WANG S, WU H, TSANG H K et al. Monolithically integrated reconfigurable add-drop multiplexer for mode-division-multiplexing systems[J]. Optics Letters, 41, 5298-5301(2016).

[12] HANZAWA N, SAITOH K, SAKAMOTO T et al. Mode multi/demultiplexing with parallel waveguide for mode division multiplexed transmission[J]. Optics Express, 22, 29321-29330(2014).

[13] WU Z, LI J, TIAN Y et al. 4-mode MDM Transmission over MMF with direct detection enabled by cascaded mode-selective couplers[C](2017).

[14] SILLARD P, OKONKWO C M, ALVARADO J C et al. Six mode selective fiber optic spatial multiplexer[J]. Optics Letters, 40, 1663-1666(2015).

[15] RYF R, CHEN H, FONTAINE N K et al. 10-Mode mode-multiplexed transmission with inline amplification[C](2016).

[16] WEERDENBURG J V, RYF R, GROSS S et al. Mode-multiplexed 16-QAM transmission over 2400-km large-effective-area depressed-cladding 3-mode fiber[C](2018).

[17] CHEN Jiake, HU Guijun, HAN Yueyu et al. Experimental system of 3×3 mod multiplexing communication based on photon Lantern[J]. Chinese Journal of Lasers, 44, 222-228(2017).

[18] LIU H, WEN H, ZACARIAS J C A et al. 3×10 Gb/s mode group-multiplexed transmission over a 20 km few-mode fiber using photonic lanterns[C](2017).

[19] SHEN L, GE D, LIU Y et al. MIMO-free 20-Gb/s×4×2 WDM-MDM transmission over 151.5-km single-span ultra low-crosstalk FMFs[C](2018).

[20] ZHANG Qiang, HAN Wei, XIONG Zhen et al. Experiment of 3×34 Gb/s PDM-QPSK signal mode-division multiplexing based on less mode fiber[J]. Optical Communication Technology, 46, 77-80(2022).

[24] FARUK M S, KIKUCHI K. Blind equalization and carrier-phase recovery in QPSK coherent optical receivers based on modified constant-modulus algorithm[C](2013).

[25] ZUO M, GE D, LIU J et al. Long-haul intermodal-MIMO-free MDM transmission based on a weakly coupled multiple-ring-core few-mode fiber[J]. Optics Express, 5868-5878(2022).