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

Journals >Chinese Journal of Lasers >Volume 49 >Issue 23 >Page 2306002 > Article

Chinese Journal of Lasers
Vol. 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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DOI: 10.3788/CJL202249.2306002 Cite this Article Set citation alerts

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 Copy Citation Text

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$Schematic of atmospheric refractive index fluctuation$

Fig. 1. Schematic of atmospheric refractive index fluctuation

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

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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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 1. Parameters 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

Table 2. Refractive index structure parameters of atmospheric turbulence in simulation experiment

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References (20)

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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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