分类： 天文学 >> 天文学 提交时间： 2023-02-19
Hao Hao
Qing-Yuan Zhao
Yang-Hui Huang
Jie Deng
Hui Wang
Jia-Wei Guo
Shi Chen
Sai-Ying Ru
Zhen Liu
Yi-Jin Zhou
Shun-Hua Wang
Chao Wan
Hao Liu
Zhi-Jian Li
Hua-bing Wang
Xue-Cou Tu
La-Bao Zhang
Xiao-Qing Jia
Jian Chen
Lin Kang
摘要： Deep space explorations require transferring huge amounts of data quickly from very distant targets. Laser communication is a promising technology that can offer a data rate of magnitude faster than conventional microwave communication due to the fundamentally narrow divergence of light. This study demonstrated a photon-sensitive receiver prototype with over Gigabit data rate, immunity to strong background photon noise, and simultaneous tracking ability. The advantages are inherited from a joint-optimized superconducting nanowire single-photon detector (SNSPD) array, designed into a four-quadrant structure with each quadrant capable of resolving six photons. Installed in a free-space coupled and low-vibration cryostat, the system detection efficiency reached 72.7%, the detector efficiency was 97.5%, and the total photon counting rate was 1.6 Gcps. Additionally, communication performance was tested for pulse position modulation (PPM) format. A series of signal processing methods were introduced to maximize the performance of the forward error correction (FEC) code. Consequently, the receiver exhibits a faster data rate and better sensitivity by about twofold (1.76 photons/bit at 800 Mbps and 3.40 photons/bit at 1.2 Gbps) compared to previously reported results (3.18 photon/bit at 622 Mbps for the Lunar Laser Communication Demonstration). Furthermore, communications in strong background noise and with simultaneous tracking ability were demonstrated aimed at the challenges of daylight operation and accurate tracking of dim beacon light in deep space scenarios.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Hao Hao
Qing-Yuan Zhao
Yang-Hui Huang
Jie Deng
Hui Wang
Jia-Wei Guo
Shi Chen
Sai-Ying Ru
Zhen Liu
Yi-Jin Zhou
Shun-Hua Wang
Chao Wan
Hao Liu
Zhi-Jian Li
Hua-bing Wang
Xue-Cou Tu
La-Bao Zhang
Xiao-Qing Jia
Jian Chen
Lin Kang
摘要： Deep space explorations require transferring huge amounts of data quickly from very distant targets. Laser communication is a promising technology that can offer a data rate of magnitude faster than conventional microwave communication due to the fundamentally narrow divergence of light. This study demonstrated a photon-sensitive receiver prototype with over Gigabit data rate, immunity to strong background photon noise, and simultaneous tracking ability. The advantages are inherited from a joint-optimized superconducting nanowire single-photon detector (SNSPD) array, designed into a four-quadrant structure with each quadrant capable of resolving six photons. Installed in a free-space coupled and low-vibration cryostat, the system detection efficiency reached 72.7%, the detector efficiency was 97.5%, and the total photon counting rate was 1.6 Gcps. Additionally, communication performance was tested for pulse position modulation (PPM) format. A series of signal processing methods were introduced to maximize the performance of the forward error correction (FEC) code. Consequently, the receiver exhibits a faster data rate and better sensitivity by about twofold (1.76 photons/bit at 800 Mbps and 3.40 photons/bit at 1.2 Gbps) compared to previously reported results (3.18 photon/bit at 622 Mbps for the Lunar Laser Communication Demonstration). Furthermore, communications in strong background noise and with simultaneous tracking ability were demonstrated aimed at the challenges of daylight operation and accurate tracking of dim beacon light in deep space scenarios.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Hao Hao
Qing-Yuan Zhao
Yang-Hui Huang
Jie Deng
Hui Wang
Jia-Wei Guo
Shi Chen
Sai-Ying Ru
Zhen Liu
Yi-Jin Zhou
Shun-Hua Wang
Chao Wan
Hao Liu
Zhi-Jian Li
Hua-bing Wang
Xue-Cou Tu
La-Bao Zhang
Xiao-Qing Jia
Jian Chen
Lin Kang
摘要： Deep space explorations require transferring huge amounts of data quickly from very distant targets. Laser communication is a promising technology that can offer a data rate of magnitude faster than conventional microwave communication due to the fundamentally narrow divergence of light. This study demonstrated a photon-sensitive receiver prototype with over Gigabit data rate, immunity to strong background photon noise, and simultaneous tracking ability. The advantages are inherited from a joint-optimized superconducting nanowire single-photon detector (SNSPD) array, designed into a four-quadrant structure with each quadrant capable of resolving six photons. Installed in a free-space coupled and low-vibration cryostat, the system detection efficiency reached 72.7%, the detector efficiency was 97.5%, and the total photon counting rate was 1.6 Gcps. Additionally, communication performance was tested for pulse position modulation (PPM) format. A series of signal processing methods were introduced to maximize the performance of the forward error correction (FEC) code. Consequently, the receiver exhibits a faster data rate and better sensitivity by about twofold (1.76 photons/bit at 800 Mbps and 3.40 photons/bit at 1.2 Gbps) compared to previously reported results (3.18 photon/bit at 622 Mbps for the Lunar Laser Communication Demonstration). Furthermore, communications in strong background noise and with simultaneous tracking ability were demonstrated aimed at the challenges of daylight operation and accurate tracking of dim beacon light in deep space scenarios.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Ling-Dong Kong
Qing-Yuan Zhao
Hui Wang
Jia-Wei Guo
Hai-Yang-Bo Lu
Hao Hao
Shu-Ya Guo
Xue-Cou Tu
La-Bao Zhang
Xiao-Qing Jia
Lin Kang
Xing-Long Wu
Jian Chen
Pei-Heng Wu
摘要： Optical spectrometers are the central instruments for exploring the interaction between light and matter. The current pursuit of the field is to design a spectrometer without the need for wavelength multiplexing optics to effectively reduce the complexity and physical size of the hardware. Based on computational spectroscopic results and combining a broadband-responsive dynamic detector, we successfully demonstrate an optics-free single-detector spectrometer that maps the tunable quantum efficiency of a superconducting nanowire into an ill-conditioned matrix to build a solvable inverse mathematical equation. Such a spectrometer can realize a broadband spectral responsivity ranging from 660 to 1900 nm. The spectral resolution at the telecom is 6 nm, exceeding the energy resolving capacity of existing infrared single-photon detectors. Meanwhile, benefiting from the optics-free setup, precise time-of-flight measurements can be simultaneously achieved. We have demonstrated a spectral LiDAR with 8 spectral channels. This work provides a concise method for building multifunctional spectrometers and paves the way for applying superconducting nanowire detectors in spectroscopy.
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