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37th European Frequency and Time Forum, EFTF 2024

作者： Wang, Yichen Yang, Fei Wu, Huimin Cao, Kang Shi, Jiawen Zhang, Xiao Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Key Laboratory of Space Laser Communication and Detection Technology Aerospace Laser Technology and System Department Shanghai China

ISBN: (纸本)9798350354270

We proposed and experimentally demonstrated a high-precision frequency transmission based on IQ modulation on silicon. The silicon photonic chip (SIPC) includes a photonic IQ modulator and some couplers. According to the calculated Allan deviation of discriminated phase, the stability of the 500MHz microwave frequency signal after EO-OE based on SIPC is 3.6× 10-14 @1s and 5.4× 10-17 @10000s. After 82km fiber link transmission, the transmission stability of 500MHz microwave frequency signal is 7.4× 10-14 @1s and 7.0× 10-15 @10000s separately. With the noise compensation of the fiber transmission, the stability of 500MHz microwave frequency signal is improved to 5.6× 10-14 @1s and 9.9× 10-16@10000s respectively. © 2024 IEEE.

关键词： Silicon photonics

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An Enhanced Velocity Measurement of Coherent Lidar Based on Time-Domain Compensation and Phase Compensation

An Enhanced Velocity Measurement of Coherent Lidar Based on ...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and Optical Communications, IPOC 2024

作者： Li, Xianzhuo Ye, Nan Zhang, Junjie Li, Yingchun Lu, Zhiyong Jia, Honghui Yuan, Haoming Liu, Wenzhong Chen, Kun Key Laboratory of Specialty Optics and Optical Access Networks Shanghai Institute for Advanced Communication Data Science Shanghai University Shanghai China Key Laboratory of Space Laser Transmission and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China

We propose an enhanced speed detection method that reduces computational resource. Measurements of targets at 18.5 km show that the average speed detection probability increases by 49.17%, and the average speed mean s... 详细信息

ISBN: (纸本)9798350379266

关键词： Velocity measurement

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Research on echo signal processing in the marine particulate organic carbon detection system

Research on echo signal processing in the marine particulate...

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2024 Applied Optics and Photonics China: Optical Sensing, Imaging technology, and Applications, AOPC 2024

作者： Wang, Zixian Shang, Jianhua Yang, Fu He, Yan College of Information Science and Technology Donghua University China College of Physics Donghua University China Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences China

ISBN: (数字)9781510687820

ISBN: (纸本)9781510687813

The ocean plays an important role in the global carbon cycle. Carbon is transmitted along the food chain in the form of particulate organic carbon (POC), starting from the photosynthesis of phytoplankton. Therefore, detecting the content of POC in the ocean plays a significant role in estimating the carbon sink capacity of the ocean. With the help of LIDAR detection systems, the profile concentration information of POC in seawater can be detected based on the optical property changes caused by phytoplankton. In order to satisfy the detection requirements of a LIDAR system, a detection capability with sensitivity up to the single photon level, dynamic range of 50dB, and response bandwidth of 180MHz, the echo optical signal detection and processing system is designed combining the analog detection and photon counting detection. By means of theoretical analysis, simulation analysis and experimental analysis, the analog detection channel output signal meets the following ADC acquisition requirements, and the photon counting channel can accurately discriminate the input pulse signal accurately. This echo optical signal detection and processing system is capable of providing a signal bandwidth of 180MHz and a fixed time delay without distortion, oscillation or pulse width broadening. © 2024 SPIE.

关键词： laser beams

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Robust free-space optical frequency transfer in time-varying link distances conditions

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Chinese Physics B 2024年第2期33卷 271-276页

作者：童周刘雷王家亮操前金志成应康韩申生韩正甫桂有珍 School of Physical Sciences University of Science and Technology of ChinaHefei 230000China Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China

Future inter-satellite clock comparison on high orbit will require optical time and frequency transmission technology between moving ***,we demonstrate robust optical frequency transmission under the condition of variable link *** variable link is accomplished by the relative motion of a single telescope fixed on the experimental platform to a corner-cube reflector(CCR)installed on a sliding *** acousto–optic modulators with different frequencies are used to separate forward signal from backward *** active phase noise suppression,when the CCR moves back and forth at a constant velocity of 20 cm/s and an acceleration of 20 cm/s^(2),we achieve the best frequency stability of 1.9×10^(-16) at 1 s and 7.9×10^(-19) at 1000 s *** work paves the way for future studying optical frequency transfer between ultra-high-orbit satellites.

关键词： free-space optical frequency transfer variable link distance

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A Real-Time Adaptive SOGI Frequency Multiplying technology for OFDR 15

A Real-Time Adaptive SOGI Frequency Multiplying Technology f...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Shuai, Luwei Ye, Lei Ye, Qing Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

A real-time adaptive second-order generalized integrator spreading technique suitable for OFDR is proposed to address the drawbacks of low spatial data utilization and complex phase extraction in the equal optical frequency sampling method. By using the discretized SOGI algorithm, the main components and orthogonal components of the original signal are obtained, and the signal phase is obtained through trigonometric calculation to achieve frequency multiplying. Using the phase signal after frequency multiplying for equal optical frequency sampling can improve the distance utilization of the auxiliary interferometer and be implemented on FPGA. Finally, it has been experimentally proven that this technology can break through the original detection distance without changing the optical path and achieving real-time performance of 4 frames per second. Realize a testing range of 300m with an auxiliary interferometer arm length difference of 150m and spatial resolution of 80μm. © 2024 SPIE.

关键词： Interferometers

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Polarimetric imaging based on coherent lidar for target detection 14

Polarimetric imaging based on coherent lidar for target dete...

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14th International Conference on Information Optics and Photonics, CIOP 2023

作者： Zhang, Longkun Sun, Jianfeng Xu, Qian Cong, Haisheng Xu, Lingling Li, Chaoyang Chen, Weibiao Department of Optics and Optical Engineering University of Science and Technology of China Hefei230026 China Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Laboratory of Space Laser Engineering Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China

ISBN: (纸本)9781510671744

We experimentally construct a polarimetric imaging architecture based on coherent lidar by using the frequency modulated continuous wave (FMCW) and the Risley prism beam steering technology for target identification. By combining coherent detection and multi-channel point cloud fusion, the proposed polarimetric imaging design is exploited to not only achieve the large-scale scene reconstruction in complex environments, but also distinguish the target from other objects with diverse structural materials or camouflage. An outdoor polarimetric imaging experiment which has an imaging scene of ±30° and an angular resolution of 0.1°, is also performed utilizing the proposed architecture. Furthermore, the structures with different polarization characteristics can be displayed by selecting different polarization parameter images, which greatly improves the information dimension of target identification. The polarimetric imaging architecture provides a multi-dimensional perception and open new opportunities for remote sensing, autonomous driving, and military reconnoitering. © 2023 SPIE.

关键词： Frequency modulation

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Continuous laser two-way time-frequency transfer in the presence of motion

Continuous laser two-way time-frequency transfer in the pres...

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2023 Advanced Fiber laser Conference, AFL 2023

作者： Shi, Jiawen Yang, Fei Cao, Kang Sun, Yanguang Zhang, Xuejiao Wang, Yichen Han, Lili Chen, Weibiao Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China China Academy of Space Technology Xi an China School of Physical Science and Technology Shanghai Tech University Shanghai China

ISBN: (纸本)9781510677661

We demonstrate high-precision free-space time and frequency transfer (FSTFT) based on laser in the presence of motion with digital phase-locked loop. Radio frequency with 1 GHz and time signal with one pulse per second (1 PPS) are transmitted over 108 m indoor atmospheric link. The experimental results reveal remarkable frequency stability with instabilities of 1.5E-14 at 1 s and 8.0E-16 at 100 s, even in the presence of a time-varying link characterized by speeds of ± 1.5 m/s. And time interval transfer of 1 PPS signal with 32 ps standard deviation of time delay jitter is obtained. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Locks (fasteners)

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Compact Quantitative Phase Imaging Based on a Polarization-Dependent Varifocal Metalens

Compact Quantitative Phase Imaging Based on a Polarization-D...

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Digital Holography and Three-Dimensional Imaging, DH 2024

作者： Min, Qixuan Guo, Jinying Situ, Guohai Wangzhijiang Innovation Center for Laser Aerospace Laser Technology and System Department Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

The transport-of-intensity equation is a non-interferometric method for quantitative phase imaging. We propose a compact TIE method based on a polarization-dependent varifocal metalens. Experimental results indicate p... 详细信息

关键词： Polarization

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A 2D post-processing method for resolution enhancement of coherent wind lidar 15

A 2D post-processing method for resolution enhancement of co...

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15th International Conference on Information Optics and Photonics, CIOP 2024

作者： Zhao, Yue Zhang, Yunpeng Zhu, Xiaopeng Bi, Decang Liu, Jiqiao Chen, Weibiao Wangzhijiang Innovation Center for Laser Aerospace Laser Technology and System Department Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

ISBN: (数字)9781510686175

ISBN: (纸本)9781510686168

Based on the time-domain simulation model of coherent wind measurement, it is deduced that the detected atmospheric backscattered spectrum is a two-dimensional convolution of the real atmospheric information and the instrument point spread function. The spatial resolution can be improved by applying the image deconvolution algorithm to the inversion of the coherent wind lidar (CWL) signal. The effect of the deconvolution algorithm in improving spatial resolution is compared in simulation and experiment. The results show that the spatial resolution can be improved effectively by using the deconvolution algorithm when the transmitted pulse waveform is known. © 2024 SPIE.

关键词： Optical transfer function

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High- Precision Frequency transmission Based on IQ Modulation and Silicon Photonics

High- Precision Frequency Transmission Based on IQ Modulatio...

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European Frequency and Time Forum (EFTF)

作者： Yichen Wang Fei Yang Huimin Wu Kang Cao Jiawen Shi Xiao Zhang Aerospace Laser Technology and System Department Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China

ISBN: (数字)9798350354270

ISBN: (纸本)9798350354287

We proposed and experimentally demonstrated a high-precision frequency transmission based on IQ modulation on silicon. The silicon photonic chip (SIPC) includes a photonic IQ modulator and some couplers. According to the calculated Allan deviation of discriminated phase, the stability of the 500MHz microwave frequency signal after EO-OE based on SIPC is $3.6\times 10^{-14}$ @1s and $5.4\times 10^{-17}$ @10000s. After 82km fiber link transmission, the transmission stability of 500MHz microwave frequency signal is $7.4\times 10^{-14}$ @1s and $7.0\times 10^{-15}$ @10000s separately. With the noise compensation of the fiber transmission, the stability of 500MHz microwave frequency signal is improved to $5.6\times 10^{-14}$ @1s and $9.9\times 10^{-16}$ @10000s respectively.

关键词： Time-frequency analysis Frequency modulation Noise Optical fiber couplers Europe Couplers Microwave frequencies Silicon photonics

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