三端口光纤耦合原子气室探头的开发及其微波数字通信应用

林沂; 吴逢川; 毛瑞棋; 姚佳伟; 刘燚; 安强; 付云起

doi:10.7498/aps.71.20220594

摘要

基于里德伯原子的量子微波测量技术快速发展并受到广泛关注, 该技术已展现出探头尺寸与波长无关、宽频谱测量等显著优势, 光纤耦合原子气室探头是便携式量子微波测量系统的关键技术之一. 现有双端口光纤耦合原子气室探头的探测光输出与耦合光输入共用渐变折射率(graded index, GRIN)透镜及光纤的方式, 使得探测光传输效率仅为17%. 在此条件下, 需通过增大探测光输入功率以获得足够的透射光输出功率, 这使得电磁诱导透明(electromagnetically-induced transparency, EIT)光谱展宽至11 MHz, 测量灵敏度降低. 本文提出集成二向色镜的三端口光纤耦合原子气室探头, 在保证原子气室中探测光、耦合光重叠相向传输的条件下, 出射的探测光被分离至独立的GRIN透镜及输出光纤, 探测光传输效率为40.4%, EIT光谱半高宽被降低至6 MHz. 该探头被用于开展EIT光谱测量、基于空间混频技术的数字通信实验研究, 实验结果验证了该探头对数字通信信号的接收能力.

关键词:

里德伯原子 /
原子气室 /
光纤 /
通信

Abstract

The quantum microwave measurement technology based on Rydberg atoms has developed rapidly and received widespread attention. It has shown significant advantages such as probe size independent of wavelength and broad spectrum measurement. Fiber-coupled vapor cell probe is one of the key technologies for portable quantum microwave measurement systems. The existing two-port fiber-coupled probe shares the graded index (GRIN) lens and optical fibers for outputting detection light with inputting coupling light, which limits light transmission efficiency of the detection light to 17%. Under these conditions, the power of the inputting detection light must be increased to ensure sufficient power to output the detection light, causing the electromagnetically-induced transparency (EIT) spectrum to broaden to 11 MHz, ultimately resulting in reduced measurement sensitivity. In this work, we propose a three-port fiber-coupled atomic gas chamber probe with an integrated dichroic mirror. On condition that the detection light and coupling light are transmitted in opposite directions and overlap in the vapor cell, the outgoing detection light is separated into two beams; one goes to an individual GRIN lens and the other to the output fiber, and the detection light transmission efficiency is 40.4%, and the half-height width of the EIT spectrum is reduced to 6 MHz. The probe is used to measure the microwave electric field intensity and phase; its effectiveness is verified by its ability to receive QPSK, 16QAM digitally modulated signals.

Keywords:

作者及机构信息

国防科技大学电子科学学院, 长沙　410073

通信作者: 付云起, yunqifu@nudt.edu.cn

基金项目: 国家自然科学基金(批准号: 61901495, 12104509)和国防科技大学科研计划(批准号: ZK19-20, ZK20-13)资助的课题.

Authors and contacts

College of Electronic Science, National University of Defense Technology, Changsha 410073, China

Corresponding author: Fu Yun-Qi, yunqifu@nudt.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61901495, 12104509) and the Scientific Research Project of National University of Defense Technology, China (Grant Nos. ZK19-20, ZK20-13).

文章全文

参考文献

[1]	Gordon J A, Holloway C L, Schwarzkopf A, Anderson D A, Miller S, Thaicharoen N, Raithel G 2014 Appl. Phys. Lett. 105 024104 Google Scholar
[2]	付云起, 林沂, 武博, 安强, 刘燚 2022 电波科学学报 37 279 Google Scholar Fu Y Q, Lin Y, Wu B, An Q, Liu Y 2022 Chin. J. Radio Sin. 37 279 Google Scholar
[3]	黄巍, 梁振涛, 杜炎雄, 颜辉, 朱诗亮 2015 物理学报 64 160702 Google Scholar Huang W, Liang Z T, Du Y X, Yan H, Zhu S L 2015 Acta Phys. Sin. 64 160702 Google Scholar
[4]	Mohapatra A K, Bason M G, Butscher B, Weatherill K J, Adams C S 2008 Nat. Phys. 4 890 Google Scholar
[5]	Jau Y Y, Carter T 2020 Phys. Rev. Appl. 13 054034 Google Scholar
[6]	Wade C G, Šibalić N, de Melo N R, Kondo J M, Adams C S, Weatherill K J 2017 Nat. Photonics 11 40 Google Scholar
[7]	Simons M T, Gordon J A, Holloway C L 2018 Appl. Opt. 57 6456 Google Scholar
[8]	Anderson D A, Raithel G A, Paradis E G, Sapiro R E 2020 US Patent US10823775B2 [2020-11-3]
[9]	Holloway C L, Simons M T, Haddab A H, Williams C J, Holloway M W 2019 AIP Adv. 9 065110 Google Scholar
[10]	Anderson D A, Sapiro R E, Raithel G 2020 IEEE Trans. Antennas Propag. 69 2455 Google Scholar
[11]	Simons M T, Haddab A H, Gordon J A, Novotny D, Holloway C L 2019 IEEE Access 7 164975 Google Scholar
[12]	Holloway C L, Simons M T, Gordon J A, Novotny D 2019 IEEE Antennas Wirel. Propag. Lett. 18 1853 Google Scholar
[13]	Gordon J A, Simons M T, Haddab A H, Holloway C L 2019 AIP Adv. 9 045030 Google Scholar
[14]	Simons M T, Haddab A H, Gordon J A, Holloway C L 2019 Appl. Phys. Lett. 114 114101 Google Scholar
[15]	Šibalić N, Pritchard J D, Adams C S, Weatherill K J 2017 Computer Phys. Commun. 220 319 Google Scholar
[16]	Robinson A K, Artusio-Glimpse A B, Simons M T, Holloway C L 2021 Phys. Rev. A 103 023704 Google Scholar
[17]	Holloway C L, Simons M T, Gordon J A, Wilson P F, Cooke C M, Anderson D A, Raithel G 2017 IEEE Trans. Electro. Compa. 59 717 Google Scholar
[18]	Fan H, Kumar S, Sheng J, Shaffer J P, Holloway C L, Gordon J A 2015 Phys. Rev. Appl. 4 044015 Google Scholar
[19]	McKinley M D, Remley K A, Myslinski M, Kenney J S, Schreurs D, Nauwelaers B 2004 64th ARFTG Conference Orlando, December 3, 2004 pp45–52
[20]	Holloway C L, Simons M T, Gordon J A, Dienstfrey A, Anderson D A, Raithel G 2017 J. Appl. Phys. 121 233106 Google Scholar

施引文献

图 1 三端口光纤耦合原子气室探头

Fig. 1. Three-port fiber-coupled vapor cell probe.

下载: 全尺寸图片幻灯片

图 2 三端口光纤耦合原子气室探头测量实验　(a)系统示意框图; (b)测试场景

Fig. 2. Three-port fiber-coupled vapor cell probe measurement experiment: (a) Schematic block diagram of the system; (b) experiment scenario.

下载: 全尺寸图片幻灯片

图 3 原子气室内的电场分布仿真结果　(a) f_LO = 9.945 GHz, yoz平面电场强度分布; (b)电场强度随频率的变化

Fig. 3. Simulated results of the electric field distribution inside the vapor cell: (a) Electric field intensity distribution in the yoz plane at f_LO = 9.945 GHz; (b) the electric field intensity with variable frequency.

下载: 全尺寸图片幻灯片

图 4 当G = 11.57 dB, R = 3 m 时, EIT-AT光谱测试结果

Fig. 4. Experimental results of EIT-AT spectral at G = 11.57 dB, R = 3 m.

下载: 全尺寸图片幻灯片

图 5 当f_LO = 9.945 GHz, f_SIG = 9.9451 GHz, |E_LO| = 1.5 V/m时, 中频信号时域波形测试结果

Fig. 5. Experimental results of IF signal time domain waveform at f_LO = 9.945 GHz, f_SIG = 9.9451 GHz, |E_LO| = 1.5 V/m.

下载: 全尺寸图片幻灯片

图 6 当f_LO = 9.945 GHz, f_SIG = 9.9451 GHz, |E_LO| = 1.5 V/m, |E_SIG| = 0.2 V/m时, 中频信号相位测试结果

Fig. 6. Experimental results of IF signal phase at f_LO = 9.945 GHz, f_SIG = 9.9451 GHz, |E_LO| = 1.5 V/m, |E_SIG| = 0.2 V/m.

下载: 全尺寸图片幻灯片

图 7 当f_LO = 9.945 GHz, f_SIG = 9.9451 GHz时, 2047个符号中频信号星座图的测试结果　(a) QPSK (10 kb/s); (b) QPSK (50 kb/s); (c) 16 QAM (10 kb/s); (d) 16 QAM (50 kb/s)

Fig. 7. Experimental results of 2047 symbol stream for IF signal constellation diagram with f_LO = 9.945 GHz, f_SIG = 9.9451 GHz: (a) QPSK (10 kb/s); (b) QPSK (50 kb/s); (c) 16 QAM (10 kb/s); (d) 16 QAM (50 kb/s).

下载: 全尺寸图片幻灯片

图 8 原子气室空间响应仿真结果　(a)立方形和(b)圆柱形原子气室的电场强度随入射角的变化; (c)空间响应平坦度随频率的变化

Fig. 8. Simulated results of spatial response of vapor cell: Electric field intensity with variable incident angle for the (a) cubic and (b) cylindrical vapor cell; (c) spatial response flatness with variable frequency.

下载: 全尺寸图片幻灯片

[1]	Gordon J A, Holloway C L, Schwarzkopf A, Anderson D A, Miller S, Thaicharoen N, Raithel G 2014 Appl. Phys. Lett. 105 024104 Google Scholar
[2]	付云起, 林沂, 武博, 安强, 刘燚 2022 电波科学学报 37 279 Google Scholar Fu Y Q, Lin Y, Wu B, An Q, Liu Y 2022 Chin. J. Radio Sin. 37 279 Google Scholar
[3]	黄巍, 梁振涛, 杜炎雄, 颜辉, 朱诗亮 2015 物理学报 64 160702 Google Scholar Huang W, Liang Z T, Du Y X, Yan H, Zhu S L 2015 Acta Phys. Sin. 64 160702 Google Scholar
[4]	Mohapatra A K, Bason M G, Butscher B, Weatherill K J, Adams C S 2008 Nat. Phys. 4 890 Google Scholar
[5]	Jau Y Y, Carter T 2020 Phys. Rev. Appl. 13 054034 Google Scholar
[6]	Wade C G, Šibalić N, de Melo N R, Kondo J M, Adams C S, Weatherill K J 2017 Nat. Photonics 11 40 Google Scholar
[7]	Simons M T, Gordon J A, Holloway C L 2018 Appl. Opt. 57 6456 Google Scholar
[8]	Anderson D A, Raithel G A, Paradis E G, Sapiro R E 2020 US Patent US10823775B2 [2020-11-3]
[9]	Holloway C L, Simons M T, Haddab A H, Williams C J, Holloway M W 2019 AIP Adv. 9 065110 Google Scholar
[10]	Anderson D A, Sapiro R E, Raithel G 2020 IEEE Trans. Antennas Propag. 69 2455 Google Scholar
[11]	Simons M T, Haddab A H, Gordon J A, Novotny D, Holloway C L 2019 IEEE Access 7 164975 Google Scholar
[12]	Holloway C L, Simons M T, Gordon J A, Novotny D 2019 IEEE Antennas Wirel. Propag. Lett. 18 1853 Google Scholar
[13]	Gordon J A, Simons M T, Haddab A H, Holloway C L 2019 AIP Adv. 9 045030 Google Scholar
[14]	Simons M T, Haddab A H, Gordon J A, Holloway C L 2019 Appl. Phys. Lett. 114 114101 Google Scholar
[15]	Šibalić N, Pritchard J D, Adams C S, Weatherill K J 2017 Computer Phys. Commun. 220 319 Google Scholar
[16]	Robinson A K, Artusio-Glimpse A B, Simons M T, Holloway C L 2021 Phys. Rev. A 103 023704 Google Scholar
[17]	Holloway C L, Simons M T, Gordon J A, Wilson P F, Cooke C M, Anderson D A, Raithel G 2017 IEEE Trans. Electro. Compa. 59 717 Google Scholar
[18]	Fan H, Kumar S, Sheng J, Shaffer J P, Holloway C L, Gordon J A 2015 Phys. Rev. Appl. 4 044015 Google Scholar
[19]	McKinley M D, Remley K A, Myslinski M, Kenney J S, Schreurs D, Nauwelaers B 2004 64th ARFTG Conference Orlando, December 3, 2004 pp45–52
[20]	Holloway C L, Simons M T, Gordon J A, Dienstfrey A, Anderson D A, Raithel G 2017 J. Appl. Phys. 121 233106 Google Scholar

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三端口光纤耦合原子气室探头的开发及其微波数字通信应用