Shangjun Yang, Xizheng Ke, Jiali Wu, Xuguang Liu. Fast Alignment of Wireless Optical Communication Using Two-Dimensional Mirror[J]. Chinese Journal of Lasers, 2022, 49(11): 1106001
- Chinese Journal of Lasers
- Vol. 49, Issue 11, 1106001 (2022)
Fig. 1. Schematic of beam alignment of wireless optical communication. (a) Coaxial alignment; (b) two-dimensional mirror assisted alignment
Fig. 2. Geometrical optical model of two-dimensional mirror
Fig. 3. Laser tracking algorithm block diagram using two-dimensional mirror
Fig. 4. Wireless optical communication IM/DD system with fast alignment of two-dimensional mirror
Fig. 5. Schematic of field experiment of wireless optical communication for 1.3 km. (a) Link diagram; (b) far field spot
Fig. 6. Schematic of beam fast calibration. (a) Structure diagram; (b) calibration camera interface
Fig. 7. Tracking curves of calibration camera system in 1.3 km field experiment under different adjustments. (a) Pitch adjustment; (b) azimuth adjustment
Fig. 8. Trajectories of outgoing spot under different incident angles and scanning angles. (a) α＝10°，θ1＝－1°1°，θ2＝－5°5°；(b) α＝30°，θ1＝－1°1°，θ2＝－5°5°；(c) α＝10°，θ1＝－1°1°，θ2＝－10°10°；(d) α＝10°，θ1＝－2°2°，θ2＝－5°5°
Fig. 9. Power spectral density of spot center drift in 1.3 km field experiment. (a) x direction; (b) y direction
Fig. 10. Tracking waveforms in 1.3 km field experiment. (a) Tracking curve; (b) track curves along x and y directions; (c) power spectral density along x direction; (d) power spectral density along y direction
Fig. 11. Signal waveforms at 1.3 km communication link. (a) Transmitting signal; (b) receiving signal
Fig. 12. Schematic of wireless optical communication system in 10.3 km field experiment. (a) Link diagram; (b) far field spot
Fig. 13. Tracking curves detected by calibration camera in 10.3 km field experiment. (a) Pitch adjustment; (b) azimuth adjustment
Fig. 14. Bidirectional alignment schematic in 10.3 km experiment. (a) System schematic; (b) transmitting end; (c) receiving end
Fig. 15. Results of 10.3 km bidirectional alignment experiment. (a) Downlink transmission signal waveform; (b) uplink detection spot
Fig. 16. Power spectral density of spot center drift in 10.3 km field experiment. (a) x direction; (b) y direction
Fig. 17. Tracking waveforms in 10.3 km field experiment. (a) Tracking curve; (b) track curves along x and y directions; (c) power spectral density along x direction; (d) power spectral density along y direction
Fig. 18. Signal waveforms at 10.3 km communication link. (a) Transmitting signal; (b) receiving signal
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Table 1. Experimental equipment and parameters
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