Joint radar and communication(JRC)technology is gradually becoming an essential approach to alleviating spectral congestion.Radar and communications systems were designed with common spectral and hardware resources to...Joint radar and communication(JRC)technology is gradually becoming an essential approach to alleviating spectral congestion.Radar and communications systems were designed with common spectral and hardware resources to reduce size,improve performance,reduce cost,and decongest the spectrum.Various approaches have been proposed to achieve the coexistence of radar and communication systems.This paper mainly focuses on the research directions of radar communication coexistence(RCC)and dual-function radar communication systems(DFRC)in JRC technology.We summarize and analyze the existing research problems in the JRC era.According to the characteristics and advantages of JRC technology,we highlight several potentials in military and commercial applications.展开更多
The enhancement of the microcavity quality factor contributes to fundamental linewidth reduction in microcavity lasers.This study demonstrates silica microrod resonators with quality factors approaching 10^(9),fabrica...The enhancement of the microcavity quality factor contributes to fundamental linewidth reduction in microcavity lasers.This study demonstrates silica microrod resonators with quality factors approaching 10^(9),fabricated by CO_(2)laser reflow technology.To improve practical applicability,low-loss package techniques were developed,yielding packaged resonators with optimized optical performance.Using this platform,stimulated Raman lasing was achieved with a pump mode Q-factor of 1.333×10^(9),exhibiting a threshold of 0.765 mW.The laser output stability was characterized by a standard deviation of 0.671 mV over 45 minutes of operation,with corresponding Allan deviation analysis.At the maximum output power of 106.4μW,the measured frequency noise spectral density reached 0.46 Hz~2/Hz,corresponding to a linewidth of 2.89 Hz.Thermal tuning of the packaged module achieved a wavelength shift of 0.206 nm,with a temperature sensitivity of 8.92 pm/℃.This work establishes a new technical pathway for developing compact narrow-linewidth lasers,showing significant potential for medical diagnostics,optical communications,and defense applications.展开更多
Escalating competition within aquatic environments,particularly in oceans,underscores the imperative for innovative solutions in underwater operations.These solutions necessitate the development of intelligent underwa...Escalating competition within aquatic environments,particularly in oceans,underscores the imperative for innovative solutions in underwater operations.These solutions necessitate the development of intelligent underwater equipment,with robotic fish emerging as a promising contender.1 Leveraging advancements in robotics and artificial intelligence,robotic fish offer a suite of advantages that position them as transformative assets in underwater exploration and operations.Robotic fish are autonomous robots designed based on biomimetics principles that mimic the appearance of fish and can autonomously swim and perform specific tasks in water.展开更多
文摘Joint radar and communication(JRC)technology is gradually becoming an essential approach to alleviating spectral congestion.Radar and communications systems were designed with common spectral and hardware resources to reduce size,improve performance,reduce cost,and decongest the spectrum.Various approaches have been proposed to achieve the coexistence of radar and communication systems.This paper mainly focuses on the research directions of radar communication coexistence(RCC)and dual-function radar communication systems(DFRC)in JRC technology.We summarize and analyze the existing research problems in the JRC era.According to the characteristics and advantages of JRC technology,we highlight several potentials in military and commercial applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.12474372,12474429,62222515,and 12174438)the National Key Research and Development Program of China(Grant Nos.2023YFB2805600 and 2023YFB2806200)+1 种基金the Natural Science Foundation of Beijing Municipality(Grant No.Z210004)the Fund from the State Key Laboratory of Information Photonics and Optical Communications(Grant No.IPOC2024ZR01)。
文摘The enhancement of the microcavity quality factor contributes to fundamental linewidth reduction in microcavity lasers.This study demonstrates silica microrod resonators with quality factors approaching 10^(9),fabricated by CO_(2)laser reflow technology.To improve practical applicability,low-loss package techniques were developed,yielding packaged resonators with optimized optical performance.Using this platform,stimulated Raman lasing was achieved with a pump mode Q-factor of 1.333×10^(9),exhibiting a threshold of 0.765 mW.The laser output stability was characterized by a standard deviation of 0.671 mV over 45 minutes of operation,with corresponding Allan deviation analysis.At the maximum output power of 106.4μW,the measured frequency noise spectral density reached 0.46 Hz~2/Hz,corresponding to a linewidth of 2.89 Hz.Thermal tuning of the packaged module achieved a wavelength shift of 0.206 nm,with a temperature sensitivity of 8.92 pm/℃.This work establishes a new technical pathway for developing compact narrow-linewidth lasers,showing significant potential for medical diagnostics,optical communications,and defense applications.
基金financially supported by the National Natural Science Foundation of China(grant nos.T2325018,62303117,and 62171274)the China Postdoctoral Science Foundation(grant no.2022M710093)+2 种基金National Postdoctoral Xiangjiang Program under Grant XJ2023018Natural Science Foundation of Fujian Provincial under Grant 2024J01278supported by a research grant funded by the University of Macao.
文摘Escalating competition within aquatic environments,particularly in oceans,underscores the imperative for innovative solutions in underwater operations.These solutions necessitate the development of intelligent underwater equipment,with robotic fish emerging as a promising contender.1 Leveraging advancements in robotics and artificial intelligence,robotic fish offer a suite of advantages that position them as transformative assets in underwater exploration and operations.Robotic fish are autonomous robots designed based on biomimetics principles that mimic the appearance of fish and can autonomously swim and perform specific tasks in water.
