[1] Huang Y T, Huang H Z, Chen H S et al. Turbulence-resistant free-space optical communication using mode diversity preamplification and reception[C], SM4A.4(2021).

[2] Ke X Z, Wu J L, Yang S J. Research progress and prospect of atmospheric turbulence for wireless optical communication[J]. Chinese Journal of Radio Science, 36, 323-339(2021).

[3] Yu Y L, Liaw S K, Chou H H et al. A hybrid optical fiber and FSO system for bidirectional communications used in bridges[J]. IEEE Photonics Journal, 7, 7905509(2015).

[4] Tu J J, Li Z H. Review of space division multiplexing fibers[J]. Acta Optica Sinica, 41, 0106003(2021).

[5] Hao X M[D]. Digital signal processing algorithm for mode diversity space optical communication system(2020).

[6] Arikawa M, Ito T. Performance of mode diversity reception of a polarization-division-multiplexed signal for free-space optical communication under atmospheric turbulence[J]. Optics Express, 26, 28263-28276(2018).

[7] Kumar N, Khandelwal V. Simulation of MIMO-FSO system with Gamma-Gamma fading under different atmospheric turbulence conditions[C], 117-124(2019).

[8] Li L, Song H Q, Zhang R Z et al. Demonstration of both mode and space diversity in a 100-Gbit/s QPSK free-space optical link to increase system tolerance to turbulence[C](2019).

[9] Krimmer J, Füllner C, Freude W et al. Statistical analysis of free-space-to-fiber coupling under atmospheric turbulence[C], NeM4B.3(2020).

[10] Malik S, Sahu P K. Assessment of the FSO communication system using adaptive and MIMO MPPM with pointing errors and an atmospheric turbulence channel[J]. Applied Optics, 60, 1719-1728(2021).

[11] Zhu Z Y, Zhao M X, Zhang Y C et al. MIMO equalization technology based on neural network in high-speed IM-DD mode division multiplexing transmission system[J]. Acta Optica Sinica, 41, 1406003(2021).

[12] Wang J Y, Yin H X, Ji X Y et al. Performance analysis of MIMO UWOC systems with weak turbulence channels using mQAM and aperture averaging[J]. Acta Optica Sinica, 41, 1901002(2021).

[13] Hao X M, Quan W, Wu P et al. Simulation of atmospheric turbulence compensation system based on mode division multiplexing[J]. Journal of Jilin University (Information Science Edition), 38, 250-257(2020).

[14] Chen D, Lu M M, Liu Y R. Effect of pointing error on adaptive subcarrier modulation performance in turbulent channel[J]. Acta Optica Sinica, 40, 2206004(2020).

[15] Al-Habash A, Andrews L C, Phillips R L. Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media[J]. Optical Engineering, 40, 1554-1562(2001).

[16] Wang F B[D]. Research on equalization technology of mode division multiplexing system based on few mode fiber(2020).

[17] Zheng D H, Li Y, Zhou H H et al. Performance enhancement of free-space optical communications under atmospheric turbulence using modes diversity coherent receipt[J]. Optics Express, 26, 28879-28890(2018).

[18] Wu Y J[D]. Research on coupling efficiency of few mode fibers in satellite optical communication(2021).

[19] Yu Y, Yin H W, Huang Z P. Simulation study of DP-QPSK coherent detection transmission system based on Optisystem[J]. Optics and Photonics Journal, 10, 134-140(2020).

[20] Guo X C, Chen K. Performance analysis of DP-QPSK coherent optical transmission system[J]. Information & Communications, 31, 52-54(2018).