Xiaojie Wu, Peng Zhang, Hang Nan, Yuanxin Wang, Shoufeng Tong, Dashuai Wang, Yang Liu. Effect Analysis and Adaptive Adjustment for Splitting Ratio of 90° Space Optical Hybrid[J]. Laser & Optoelectronics Progress, 2020, 57(15): 150602
- Laser & Optoelectronics Progress
- Vol. 57, Issue 15, 150602 (2020)
Fig. 1. Relation curve of frequency-locked range, phase-locked time and splitting ratio
Fig. 2. Influence of splitting ratio on residual phase error of loop
Fig. 3. Influence of splitting ratio under different laser linewidths on loop residual phase error
Fig. 4. Bode diagram of loop open-loop transfer function when the k=0.02. (a) Amplitude frequency characteristic; (b) phase frequency characteristic
Fig. 5. Schematic diagram of the splitting ratio adaptive adjustment system
Fig. 6. Simulation model of BPSK homodyne coherent optical communication system
Fig. 7. Curve of splitting ratio with half-wave plate rotation angle
Fig. 8. System eye diagram and bit error rate under different splitting ratios. (a) System eye diagram when k=0.5; (b) system eye diagram when k=0.25; (c) system eye diagram when k=0.06; (d) system bit error rate for different splitting ratios
Fig. 9. Experimental structure diagram of bit error rate test under different splitting ratios
Fig. 10. Relationship between the bit error rate and splitting ratio
Fig. 11. Simulink simulation model of phase-locked loop
Fig. 12. Output voltage waveform of voltage controlled oscillator. (a) Output voltage waveform when the frequency difference is within the frequency-locked range; (b) output voltage waveform when the frequency difference is outside the frequency-locked range
Fig. 13. Loop frequency-locked range and frequency-locked time for different splitting ratios
Fig. 14. Control voltage waveform when the passive proportional-integral filter loop loses lock when k=0.01
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Table 1. System bit error rate under different splitting ratios in weak light condition
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