Analysis of the influence of defocus on the field of view of laser communication reception
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摘要: 为了降低自由空间激光通信中对准难度，本文提出了采用离焦的方法以增大接收视场角。以满足通信所需最低能量（-35 dBm）为基准，理论推导了探测器接收能量、接收视场角（FOV）、离焦接收能量及离焦量之间的相互关系，并通过Matlab仿真，分析对比了离焦接收能量和离焦量对接收视场角的影响。结果显示，当离焦量为0.5 mm时，离焦接收能量从-20.9 dBm提高到-4.1 dBm，接收视场角能增大0.27 mrad；当离焦接收能量为-4.1 dBm时，离焦量从0.2 mm扩大到1.0 mm，视场角能增大1.75 mrad。通过对比表明，提高离焦接收能量以及扩大离焦量都可以增加接收视场角，且扩大离焦量的效果相对比较明显，这对后续离焦系统的设计提供了理论指导依据。Abstract: A defocus method is proposed in this paper to increase the receiving field of view and reduce the difficulty of alignment in free space laser communication. Based on the minimum energy required for communication (-35 dBm), the relationship between detector receiving energy, receiving field of view (FOV), defocus receiving energy and defocusing amount is theoretically derived and simulated by Matlab. We analyses and compare the influence of defocused receiving energy and defocusing on the received field of view. The results show that when the defocusing amount is 0.5 mm, the defocus receiving energy is increased from -20.9 dBm to -4.1 dBm, the receiving FOV can be increased by 0.27 mrad. When the defocus receiving energy is -4.1 dBm, the defocus amount is increased from 0.2 mm to 1.0 mm, the FOV will be increased by 1.75 mrad. The comparison shows that increasing the defocus receiving energy and expanding the defocusing amount can increase the receiving field of view, and the effect of expanding the defocusing amount is relatively significant, which provides a theoretical guidance for the design of the subsequent defocusing system.
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Key words:
- laser communication /
- defocus /
- field of view /
- defocus receiving energy
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图 2 不同离焦量和视场下的光斑示意图
Figure 2. Schematic diagram of spot at different defocusing amount and FOV
图 3 光斑与探测器重叠面积示意图
Figure 3. Schematic diagram of overlapping area of spot and detector
图 5 固定视场下的离焦量变化示意图
Figure 5. Schematic diagram of defocusing amount change at fixed FOV
图 6 固定离焦量下的视场变化示意图
Figure 6. Schematic diagram of FOV change at fixed defocusing amount
图 7 光斑完全覆盖探测器面下的探测器接收能量与离焦量的关系图
Figure 7. Relation diagram of energy received by detector and defocusing amount under the condition of detector completely covered by the spot
图 8 固定重叠面积下的最大视场示意图
Figure 8. Schematic diagram of maximum FOV at fixed overlapping area
图 9 不同视场下的探测器接收能量与离焦量的关系曲线
Figure 9. Relation curves of energy received by detector and defocusing amount at different FOVs
图 10 不同离焦接收能量下探测器接收能量与视场角的关系曲线
Figure 10. Relation curves of energy received by detector and FOV at different defocus receiving energy
图 12 不同离焦量下探测器接收能量与视场角的关系曲线图
Figure 12. Relation curves of energy received by detector and FOV at different defocusing amount
表 1 链路计算输入参数
Table 1. Input parameters of link calculation
Parameter/unit Value Pt/dBm 20 Dr/mm 20 D/mm 50 f/mm 150 ω/μrad 400 γt /dBm 1.87 γr/dBm 0.97 γf/dBm 1.55 γa/(dBm·km-1) 1.6 
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表 2 不同通信距离下的离焦接收能量
Table 2. Defocus receiving energy at different communication distances
Parameter/unit Value L/km 1 2 3 4 Pr/dBm -4.1 -11.7 -16.8 -20.9
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表 3 离焦与非离焦接收视场对比
Table 3. Contrast of FOV under the conditions of defocus and non-defocus
Image 2θ/mrad Δx/mm PAPD/dBm defocus 1 0.266 -35 1.5 0.495 -35 2 0.723 -35 2.5 0.952 -35 non-defocus 0.417 0 -35
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