Coexistence System Design of Free Space Quantum-Classical Signal Based on Wavelength Division Multiplexing

Fig. 10. APD output electric pulses of 1550 nm QKD system. (a) Polarization state of 0; (b) polarization state of 90; (c) polarization state of +45; (d) polarization state of -45

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Fig. 11. Comparison of electric pulses from four APDs

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Fig. 12. Quantum key transmission process

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Fig. 13. Binary sequences of classical signal in transmitter and receiver. (a) Transmitter; (b) receiver

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Fig. 14. Comparison of classical information in transmitter and receiver

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Fig. 15. Eye diagram of classical signal

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Table 1. Parameters of FSO channel model

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Table 1. Parameters of FSO channel model

Parameter	Value
Transmission distance /km	1
Channel attenuation /(dB·km^-1)	5
Transmitter aperture diameter /cm	30
Receiving aperture diameter /cm	40
Beam divergence /mrad	0.03
Transmitter loss /dB	2
Receiver loss /dB	2
Scintillation model	Gamma-Gamma
Index refraction structure /m^-2/3	1.7×10^-14

Table 2. 1550 nm quantum key information
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Table 2. 1550 nm quantum key information
0 1 0 0 0 1 0 1 0 0 1 0 1
Quantum key information 0 1 0 0 1 1 1 0 1 1 1 0 1
45 -45 0 45 45 90 45 -45 45 45 -45 45 -45
Polarization state 0 90 45 45 -45 90 -45 0 -45 -45 90 0 90

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Yu Zhu, Lei Shi, Jiahua Wei, Qiuli Zhu, Ru Yang, Guhao Zhao. Coexistence System Design of Free Space Quantum-Classical Signal Based on Wavelength Division Multiplexing[J]. Laser & Optoelectronics Progress, 2019, 56(8): 082702

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