距离选通成像系统中短脉冲激光驱动技术研究

王翀; 杨嘉皓; 朱炳利; 韩江浩; 党文斌

doi:10.37188/CO.2022-0142

距离选通成像系统中短脉冲激光驱动技术研究

doi: 10.37188/CO.2022-0142

1.
西安邮电大学电子工程学院, 陕西西安 710121
2.
中国科学院西安光学精密机械研究所中国科学院超快诊断技术重点实验室, 陕西西安 710119

基金项目: 国家自然科学基金（No. 51709228），陕西省自然科学基金（No. 2020JM-578）

详细信息

作者简介:
王翀（1972—），男，陕西咸阳人，职称副教授，本科及硕士均毕业于西南交通大学，光通信技术专业。主要研究方向为光电子技术、光通信及器件。E-mail：cw72@xupt.edu.cn

杨嘉皓（1998—），男，陕西西安人，学历硕士研究生，电子信息专业，主要从事激光成像、图像处理等方面的研究。E-mail：Y1998jh@163.com

中图分类号: TN249
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出版历程
- 网络出版日期: 2022-09-28

Study of short pulse laser drive technology in a distance-selective imaging system

1.
School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
2.
Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences Key Laboratory of Ultrafast Diagnostic Technology, Chinese Academy of Sciences, Xi'an 710119, China

Funds: Supported by National Natural Science Foundation of China (No. 51709228); Natural Science Foundation of Shaanxi Province (No. 2020JM-578)

More Information

Corresponding author: Y1998jh@163.com

摘要

摘要:
基于单光子探测的距离选通成像系统中，发射短脉冲激光并进行发射器和接收器之间的同步控制，探测器工作在光子计数模式并在时间上积分完成成像操作。为了获得满足系统要求的短脉冲激光，同时减小系统体积、降低系统成本，本文提出将基于射频双极晶体管和基于阶跃恢复二极管SRD(结合短路传输线)两种产生窄脉冲电路应用于单光子距离选通成像系统中，介绍了二者的原理与设计方法，进行了仿真验证、实物制作及测试，对脉冲发生器的特点、影响脉宽幅值的因素进行了分析。实物测试结果表明，基于晶体管方式可以产生上升时间903.5 ps、下降时间946.1 ps、脉冲宽度824 ps、幅度2.46 V的窄脉冲；基于SRD方式可以产生上升时间456.8 ps、下降时间458.3 ps、脉冲宽度1.5 ns、幅度2.38 V的窄脉冲，二者重复频率皆可达到50 MHz。通过此两种设计方法配合外部电流驱动激光二极管都能够获得性能优良的短脉冲激光输出。
- 距离选通成像 /
- 双极性晶体管 /
- 阶跃恢复二极管(SRD) /
- 短脉冲激光
Abstract:
In a distance-selected imaging system based on single-photon detection, a short-pulse laser is emitted and between the transmitter and receiver for synchronization control, and the detector operates in photon counting mode and integrates in time to complete the imaging. In this paper, in order to obtain a short pulse laser that meets the system requirements while reducing the system’s size and cost, we propose to apply these two types of narrow pulse generation circuits to single photon distance selective imaging systems. We introduce the principle and design method of both types and verify the system through simulation, physical fabrication and testing. The characteristics of the pulse generator and factors affecting its pulse width and amplitude are analyzed. The physical test results show that the transistor-based method can generate a narrow pulse with a rise time of 903.5 ps, a fall time of 946.1 ps, a pulse width of 824 ps, and an amplitude of 2.46 V; the SRD-based method can generate a narrow pulse with a rise time of 456.8 ps, a fall time of 458.3 ps, a pulse width of 1.5 ns, and an amplitude of 2.38 V; and the repetition frequency of both can reach 50 MHz. Both design methods can be used with external current-driven laser diodes to achieve excellent short pulse laser output.
- range-gated imaging /
- bipolar transistor /
- step recovery diode /
- short pulse laser

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图 1 晶体管窄脉冲产生电路原理图

Figure 1. Schematic diagram of a transistor narrow pulse generation circuit

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图 2 电路中各个点响应仿真结果

Figure 2. Response simulation results of various points in the circuit

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图 3 窄脉冲产生原理框图

Figure 3. Schematic diagram of narrow pulse generation

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图 4 晶体管窄脉冲产生电路实物图

Figure 4. Real picture of a transistor narrow pulse generation circuit

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图 5 不同条件下实测结果

Figure 5. Measured results under different conditions

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图 6 SRD正反偏时的内部结构和等效电路图

Figure 6. Forward/Reverse Bias Block Diagram and Equivalent circuit of the SRD

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图 7 SRD结合延时线产生窄脉冲电路原理图

Figure 7. SRD combined with a delay line to generate narrow pulse circuit schematic

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图 8 窄脉冲形成机理示意图

Figure 8. Schematic diagram of the narrow pulse formation process

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图 9 窄脉冲输出信号仿真结果

Figure 9. Simulation results of a narrow pulse’s output signal

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图 10 窄脉冲产生原理框图

Figure 10. Schematic diagram of narrow pulse generation

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图 11 SRD脉冲产生电路实物图

Figure 11. SRD pulse generation circuit physical diagram

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图 12 传输线不同长度情况

Figure 12. Transmission line with different lengths

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图 13 不同频率不同传输线长度时实测结果

Figure 13. Measured results at different frequencies and different transmission line lengths

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图 14 传输线长度对于脉冲宽度和幅度的影响

Figure 14. Effect of transmission line length on pulse width and amplitude

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图 15 50 M方波激励源L_d=5 cm的脉冲波形

Figure 15. 50 MHz, Pulse waveform of 7 V_pp, L_d=5 cm

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图 16 光脉冲测量

Figure 16. Optical pulse measurement

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表 1 其他情况下测试数据

Table 1. Test data in other cases

激励源频率	外加电源	脉冲宽度	脉冲幅度
10 MHz	5 V	1.186 ns	4.24 V
20 MHz	5 V	1.041 ns	3.68 V
50 MHz	5 V	824.0ps	2.46 V
10 MHz	10 V	1.869 ns	8.16 V
20 MHz	10 V	1.508 ns	7.32 V
50 MHz	10 V	1.011 ns	6.04 V

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表 2 其他情况下测试数据

Table 2. Test data in other cases

激励源频率	传输线长度	脉冲脉宽	脉冲幅度
10 MHz	10 cm	1.493 ns	2.86 V
20 MHz	10 cm	1.498 ns	2.606 V
50 MHz	10 cm	1.525 ns	2.38 V
10 MHz	20 cm	2.884 ns	3.00 V
20 MHz	20 cm	2.923 ns	2.82 V
50 MHz	20 cm	2.878 ns	2.30 V

下载: 导出CSV

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