超导单光子探测器暗计数对激光测距距离的影响

张森; 陶旭; 冯志军; 吴淦华; 薛莉; 闫夏超; 张蜡宝; 贾小氢; 王治中; 孙俊; 董光焰; 康琳; 吴培亨

doi:10.7498/aps.65.188501

摘要

超导纳米线单光子探测器（SNSPD）是一种新型单光子探测器，具有灵敏度高、时间精度高、探测速度快和暗计数低等特点，在激光测距等领域具有重要应用前景. 本文将SNSPD应用到1064 nm 波段激光测距系统，研究了其暗计数和信噪比对激光测距的影响. 基于实验获得的回波数据，结合激光雷达理论，研究了系统信噪比与脉冲积累次数的关系. 分析表明，SNSPD暗计数是影响测距距离的关键因素之一. 结合仿真，进一步探究了基于SNSPD的激光测距系统信噪比与回波率、暗计数的关系，暗计数较大时，信噪比随脉冲积累次数增加出现波动现象，回波信号湮没. 由于SNSPD暗计数极低，本基于SNSPD的测距系统最远测距可达280 km，较同样条件下基于APD探测器的测距系统最远探测距离远40 km，在军事侦查、探测和制导等领域具有重要应用前景.

关键词:

Abstract

Superconducting nanowire single photon detector (SNSPD) is a competitive candidate in laser ranging at 1064 nm wavelength compared with other single photon detectors such as InGaAs/InP APD for its high sensitivity, high time precision and low dark counts. In this paper, we apply our SNSPD to a laser ranging system measuring target in Qinghai lake area with atmospheric scatter. The echo photons are received by telescope, and transport through the multimode fiber to the SNSPD photon-sensitive area. The SNSPD, integrated in an optical cavity with a resonant wavelength of 1064 nm, is fabricated on a MgF2 substrate. The optical absorption of NbN film goes up to 98% according to FDTD simulation, and the system efficiency is measured to be about 40%. A pulsed laser at 1064 nm, featuring a peak power of 12 MW and a pulse width of 10 ns, is adopted in the laser ranging system. In this experiment, we first measure the system intrinsic noise and the environment noise introduced into the laser ranging system after turning off the laser. After that, we measure the echo rate for the target at 126 km, which increases up to 96% with an attenuator of 10 dB at the receiver side. The maximum distance of the laser ranging system is analyzed based on the experimental results of dark count and echo rate through a theoretical model of laser radar. The analysis indicates that signal-to-noise ratio (SNR) is increased smoothly with the accumulation of time. At the same time, we simulate how the dark counts influence the capability of laser ranging system based on SNSPD, the simulated SNR matches well with the experimental data of target at 126 km. Furthermore, the dark counts, accumulation of time and probability of echo photon affect the SNR according to the simulation results, showing that large dark counts would result in SNR fluctuation and signal annihilation when the probability of echo photon is low. Thus, the maximum distance of laser ranging under the assumption of integration time is estimated through the SNR simulated result, showing that a maximum distance is up to 280 km, 40 km far away from APD detector based system under the same conditions mainly due to the very low dark counts of SNSPD. It should be pointed out that the coupling efficiency between SNSPD and the receiving telescope is low for small view field limited by the 62.5 m fiber of SNSPD. Thus, further work is to fabricate SNSPD with a larger coupling area which is possible to increase the maximum distance with improved coupling settings.

Keywords:

作者及机构信息

1.
南京大学超导电子学研究所, 南京 210093;

2.
南京电子技术研究所, 智能感知技术重点实验室, 南京 210039;

3.
中国电子科技集团公司第二十七研究所, 郑州 450047;

4.
北京跟踪与通信技术研究所, 北京 100094

通信作者: 张蜡宝, Lzhang@nju.edu.cn

基金项目: 国家自然科学基金（批准号：11227904，61471189）资助的课题.

Authors and contacts

1.
Superconducting Electronics Research Institute, Nanjing University, Nanjing 210093, China;

2.
Key Laboratory of Intelligent Sensing Technology, Nanjing Institute of Electronic Technology, Nanjing 210039, China;

3.
The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou 450047, China;

4.
Beijing Institute of Tracking and Telecommunications Technology, Beijing 100094, China

Corresponding author: Zhang La-Bao, Lzhang@nju.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11227904, 61471189).

参考文献

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[15]	Li H, Chen S, You L, Meng W, Wu Z, Zhang Z, Tang K, Zhang L, Zhang W, Yang X, Liu X, Wang Z, Xie X 2016 Opt. Express 24 3535
[16]	Zhang L, Wan C, Gu M, Xu R, Zhang S, Kang L, Chen J, Wu P 2015 Sci. Bull. 60 1434
[17]	Zhang L, Gu M, Jia T, Qiu J, Kang L, Sun G, Chen J, Jin B, Xu W, Wu P 2014 Appl. Phys. B 115 295
[18]	Miki S, Yamashita T, Fujiwara M, Sasaki M, Wang Z 2011 IEEE Trans. Appl. Supercond. 21 332
[19]	Rosfjord K M, Yang J K W, Dauler E A, Kerman A J, Anant V, Voronov B M, Gol'tsman G N, Berggren K K 2006 Opt. Express 14 527
[20]	Zhai D S, Fu H L, He S H, Zheng X M, Li Z L, Li Y Q, Xiong Y H 2009 Astro. Res. Tech. 6 13 (in Chinese)[翟东升, 伏红林, 何少辉, 郑向明, 李祝莲, 李语强, 熊耀恒 2009 天文研究与技术 6 13]
[21]	Bao Z, Liang Y, Wang Z, Li Z, Wu E, Wu G, Zeng H 2014 Appl. Opt. 53 3908
[22]	Pellegrini S, Buller G, Smith J M, Wallace A M, Cova S 2000 Meas. Sci. Technol. 11 712

施引文献

[1]	Degnan J J 2007 International Workshop From Quantum to Cosmos-Fundamental Physics Research in Space Warrenton, Virginia, May 21-24, 2007 p2137
[2]	Ren M, Gu X, Liang Y, Kong Y, Wu E, Wu G, Zeng H 2011 Opt. Express 19 13497
[3]	Scarcella C, Boso G, Ruggeri A, Tosi A, Tosi A 2015 IEEE J. Sel. Top. Quantum Electron. 21 17
[4]	Dauler E A, Kerman A J, Robinson B S, Yang J K, Voronov B, Gol'tsman G, tsman G, Hamilton S A, Berggren K K 2009 J. Mod. Opt. 56 364
[5]	Zhang L B, Kang L, Chen J, Zhao Q Y, Jia T, Xu W W, Cao C H, Jin B B, Wu P H 2011 Acta Phy. Sin. 60 038501 (in Chinese) [张腊宝, 康琳, 陈健, 赵清源, 郏涛, 许伟伟, 曹春海, 金飚兵, 吴培亨 2011 60 038501]
[6]	Zhang L, Zhao Q, Zhong Y, Chen J, Cao C, Xu W, Kang L, Wu P, Shi W 2009 Appl. Phys. B 97 187
[7]	Zhang L, Kang L, Chen J, Zhong Y, Zhao Q, Jia T, Cao C, Jin B, Xu W, Sun G, Wu P 2011 Appl. Phys. B 102 867
[8]	Chen S, Liu D, Zhang W, You L, He Y, Zhang W, Yang X, Wu G, Ren M, Zeng H, Wang Z, Xie X, Jiang M 2013 Appl. Opt. 52 3241
[9]	Vodolazov D Y, Korneeva Y P, Semenov A V, Korneev A A, Gol'tsman G N 2015 Phys. Rev. B 2 9
[10]	Henrich D, Dorner S, Hofherr M, Il'in K, Semenov A, Heintze E, Scheffler M, Dressel M, Siegel M, Siegel M 2012 J. Appl. Phys. 112 8
[11]	Shibata H, Honjo T, Shimizu K 2014 Opt. Lett. 39 5078
[12]	Wang Z, Miki S, Fujiwara M 2009 IEEE J. Sel. Top. Quantum Electron. 15 1741
[13]	Natarajan C M, Haertig M M, Warburton R E, Buller G D, Hadfield R H, Baek B, Nam S W, Miki S, Fujiwara M, Sasaki M, Wang Z 2010 1st International Conference of Quantum Communication and Quantum Networking Naples, Italy Octorber 26-30, 2010 p225
[14]	Fitzpatrick C R, Natarajan C M, Warburton R E, Buller G S, Baek B, Nam D, Miki D, Wang Z, Sasaki M, Sinclair A G, Hadfield R H 2010 Conference on Advanced Photon Counting Techniques IV Orlando, Florida, April 7-8, 2010 76810H
[15]	Li H, Chen S, You L, Meng W, Wu Z, Zhang Z, Tang K, Zhang L, Zhang W, Yang X, Liu X, Wang Z, Xie X 2016 Opt. Express 24 3535
[16]	Zhang L, Wan C, Gu M, Xu R, Zhang S, Kang L, Chen J, Wu P 2015 Sci. Bull. 60 1434
[17]	Zhang L, Gu M, Jia T, Qiu J, Kang L, Sun G, Chen J, Jin B, Xu W, Wu P 2014 Appl. Phys. B 115 295
[18]	Miki S, Yamashita T, Fujiwara M, Sasaki M, Wang Z 2011 IEEE Trans. Appl. Supercond. 21 332
[19]	Rosfjord K M, Yang J K W, Dauler E A, Kerman A J, Anant V, Voronov B M, Gol'tsman G N, Berggren K K 2006 Opt. Express 14 527
[20]	Zhai D S, Fu H L, He S H, Zheng X M, Li Z L, Li Y Q, Xiong Y H 2009 Astro. Res. Tech. 6 13 (in Chinese)[翟东升, 伏红林, 何少辉, 郑向明, 李祝莲, 李语强, 熊耀恒 2009 天文研究与技术 6 13]
[21]	Bao Z, Liang Y, Wang Z, Li Z, Wu E, Wu G, Zeng H 2014 Appl. Opt. 53 3908
[22]	Pellegrini S, Buller G, Smith J M, Wallace A M, Cova S 2000 Meas. Sci. Technol. 11 712

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