Free-Space Optical Communication Atmospheric Turbulence Compensation Based on Multiple Input Multiple Output Mode Diversity Coherent Reception

Han Yin; Yingxiong Song; Yingchun Li; Song Chen; Yetian Huang

doi:10.3788/CJL202249.2306002

Chinese Journal of Lasers, Volume. 49, Issue 23, 2306002(2022)

Free-Space Optical Communication Atmospheric Turbulence Compensation Based on Multiple Input Multiple Output Mode Diversity Coherent Reception

Han Yin^1,2、**, Yingxiong Song^1,2, Yingchun Li^1,2、*, Song Chen^1,2, and Yetian Huang^1,2

Author Affiliations

¹Key Laboratory of Special Optical Fiber and Optical Access Network, School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China

²International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai 200444, China

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Abstract Get PDF(in Chinese)

Figures & Tables(18)

$Schematic of atmospheric refractive index fluctuation$

Fig. 1. Schematic of atmospheric refractive index fluctuation

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Fig. 2. Modeling schematic for few-mode fiber (FMF) collection of free space optical communication (FSO) beam

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Fig. 3. Schematic of simulation system

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Fig. 4. Offline processing steps based on LMS-MIMO algorithm

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Fig. 5. LMS-MIMO adaptive equalizer structure diagram

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Fig. 6. Constellation of X-polarization with one mode compensation when $C_{n}^{2}$ ＝3.51×10^－14

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Fig. 7. Constellation of Y-polarization with one mode compensation when $C_{n}^{2}$ ＝3.51×10^－14

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Fig. 8. Constellation of X-polarization with three modes compensation when $C_{n}^{2}$ ＝3.51×10^－14

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Fig. 9. Constellation of Y-polarization with three modes compensation when $C_{n}^{2}$ ＝3.51×10^－14

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Fig. 10. Constellation of X-polarization with one mode compensation when $C_{n}^{2}$ ＝2.6×10^－13

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Fig. 11. Constellation of Y-polarization with one mode compensation when $C_{n}^{2}$ ＝2.6×10^－13

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Fig. 12. Constellation of X-polarization with three modes compensation when $C_{n}^{2}$ ＝2.6×10^－13

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Fig. 13. Constellation of Y-polarization with three modes compensation when $C_{n}^{2}$ ＝2.6×10^－13

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Fig. 14. Relation diagram of optical signal-to-noise ratio (OSNR) and bit error rate (BER) when $C_{n}^{2}$ ＝2.1×10^－16

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Fig. 15. Relation diagram of OSNR and BER when $C_{n}^{2}$ ＝3.51×10^－14

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Fig. 16. Relation diagram of OSNR and BER when $C_{n}^{2}$ ＝2.6×10^－13

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Table 1. Parameters in simulation experiment

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Table 1. Parameters in simulation experiment

Parameter	Value
Wavelength /nm	1550
Bit rate /(Gbit·s^－1)	100
Sampling rate /GHz	800
Laser line width /kHz	100
Atmospheric channel length /km	5
Single/multimode fiber length /km	1
Launch waist /m	0.02
Receiver aperture diameter /m	0.10
Numerical aperture	0.1339
Core refractive index	1.4485
Value of fiber	3.8
Fiber core radius /μm	7
Supported modes	LP₀₁, LP₁₁
Fiber attenuation /(dB·km^－1)	0.19, 0.19
Dispersion /[ps·(nm·km)^－1]	21.1, 20.7
Differential group delay (DGD) /(ps·m^－1)	0, 2.1
Dual polarization transmitter insertion loss of modulator /dB	6
Dual polarization receiver insertion loss /dB	0
Dual polarization receiver responsivity of photo-diode /(A·W^－1)	1

Table 2. Refractive index structure parameters of atmospheric turbulence in simulation experiment
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Table 2. Refractive index structure parameters of atmospheric turbulence in simulation experiment
Turbulence condition Refractive index structure constant $C_{n}^{2}$
Weak turbulence 2.1×10^－16
Medium turbulence 3.51×10^－14
Strong turbulence 2.6×10^－13

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Han Yin, Yingxiong Song, Yingchun Li, Song Chen, Yetian Huang. Free-Space Optical Communication Atmospheric Turbulence Compensation Based on Multiple Input Multiple Output Mode Diversity Coherent Reception[J]. Chinese Journal of Lasers, 2022, 49(23): 2306002

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