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
- Laser & Optoelectronics Progress
- Vol. 56, Issue 8, 082702 (2019)
Fig. 1. Structural diagram of quantum-classical signal coexistence system
Fig. 2. Structural diagram of transmitting terminal of classical signal
Fig. 3. Structural diagram of receiving terminal of classical signal
Fig. 4. Structural diagram of transmitting terminal of QKD system
Fig. 5. Structural diagram of receiving terminal of QKD system
Fig. 6. Security key rate versus distance under different turbulence intensities
Fig. 7. RPER of 4-PPM signal under different slots
Fig. 8. RPER of 4-PPM signal under different LP
Fig. 9. 26 quantum signal pulses
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
Fig. 11. Comparison of electric pulses from four APDs
Fig. 12. Quantum key transmission process
Fig. 13. Binary sequences of classical signal in transmitter and receiver. (a) Transmitter; (b) receiver
Fig. 14. Comparison of classical information in transmitter and receiver
Fig. 15. Eye diagram of classical signal
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Table 1. Parameters of FSO channel model
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Table 2. 1550 nm quantum key information
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