[2] [2] NEUNER B. Undersea laser communication using polarization and wavelength modulation[J]. Applied Optics, 2016, 53(11): 2283-2289.

[3] [3] LEI T, ZHANG M, LI Y, et al. Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings[J]. Light Science & Applications, 2015, 4(3): 463-469.

[4] [4] BAGHDADY J, MILLER K, MORGAN K, et al. Multi-gigabit/s underwater optical communication link using orbital angular momentum multiplexing[J]. Optics Express, 2016, 24(9): 9794-9805.

[6] [6] ZHANG J R, FAN F, ZENG J W, et al. Prototype system for underwater wireless optical communications employing orbital angular momentum multiplexing[J]. Optics Express, 2021, 29(22): 35570-35578.

[7] [7] HEI X B, ZHU Q M, GAI L, et al. Photon-counting-based underwater wireless optical communication employing orbital angular momentum multiplexing[J]. Optics Express, 2023, 31(12): 19990-20004.

[8] [8] WANG J. High-dimensional structured light coding/decoding for free space optical communications free of obstructions[J]. Optics Letters, 2015, 40(21): 4827-4830.

[9] [9] WANG W, WANG P, CAO T, et al. Performance investigation of underwater wireless optical communication system using M-ary OAMSK modulation over oceanic turbulence[J]. IEEE Photonics Journal, 2017, 9(5): 1-15.

[12] [12] CUI X Z, YIN X L, CHANG H, et al. Analysis of an adaptive orbital angular momentum shift keying decoder based on machine learning under oceanic turbulence channels[J]. Optics Communications, 2018, 429: 138-143.

[13] [13] CUI X Z, YIN X L, CHANG H, et al. Experimental study of machine-learning-based orbital angular momentum shift keying decoders in optical underwater channels[J]. Optics Communications, 2019, 452: 116-123.

[15] [15] WANG Z Y, CHEN M, WAN M Y, et al. Coherent demodulated underwater wireless optical communication system based on convolutional neural network[J]. Optics Communications, 2023, 534: 129-316.