Results 1 to 10 of about 20,016 (146)
Optimization of space laser coupling with few-mode fiber in the presence of random angular jitter
AIP Advances, 2022 In a space laser communication system with a few-mode fiber as the receiving terminal, the influence of random angular jitter on the communication performance cannot be ignored.
Zhaoyuan Zhang
doaj +4 more sources
Results in Physics, 2020 Increasing experimental evidence and theoretical results verify that the non-Kolmogorov property and anisotropy are both exhibited in the atmospheric turbulence.
Chao Zhai
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Results in EngineeringRecent experiments have demonstrated that the anisotropic property of turbulence cells is inherently present, and the long axis of turbulence cell possibly is not level with the ground but has an anisotropic tilt angle with it.
Chao Zhai, Zhenyuan Xue
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Applied Optics, 2010 In an optically preamplified differential phase-shift keying (DPSK) receiver with Mach–Zehnder interferometer (MZI) demodulation, it is essential to couple free space light into a single-mode fiber, by which the received optical signal can be guided into the amplifier and MZI. Random angular jitter has a profound impact on fiber coupling efficiency, in
Liying Tan, Qiqi Han
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Asia Communications and Photonics Conference/International Conference on Information Photonics and Optical Communications 2020 (ACP/IPOC), 2020 By introducing 3-mode and 6-mode FMF photonic lanterns, we present modes diversity receive scheme for FSOC system under random angular jitter with high efficiency. The coupling efficiency improved 30.77% and 50.23%, when the radial offset is 7 μm.
Long Zhu +5 more
semanticscholar +3 more sources
55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law, 2004 M. Toyoshima
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On the choice of the aperture diameter of the probe laser in ground-based adaptive optoelectronic systems in the formation of a sodium reference star [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2021 Subject of study. The authors propose an integrated approach to the problem of determining the aperture diameter of a probe laser that forms a laser reference star used in ground-based adaptive optoelectronic systems. The relevance of this study is due
Victor V. Kleymionov +2 more
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IEEE Access, 2020 The present study proposes an active disturbance rejection sliding mode traction control system to deal with the dramatic change of joint angular acceleration and jitter attributed to non-uniform traction during terminal traction of the manipulator based
Peng Ji, Fengying Ma, Feng Min
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Orbital Angular Momentum Transmission Based on Satellite Formation Relay in Space Communications
Asia-Pacific Microwave Conference, 2022 Orbital Angular Momentum (OAM) transmission is expected to be implemented for large capacity communication. However, the conical beam and the coaxial all-phase reception brings painful difficulties. As a promising solution to overcome this difficulty, an
Yufei Zhao +5 more
semanticscholar +2 more sources
Impact of pulse time uncertainty on synchronous average: Statistical analysis and relevance to rotating machinery diagnosis [PDF]
Mechanical systems and signal processing, 2019 Time synchronous averaging for the extraction of periodic waveforms is a rather common processing method for rotating machinery diagnosis. By synchronizing the signal to the rotational angle of the component of interest, e.g.
V. Camerini +3 more
semanticscholar +2 more sources