Journal ArticleDOI
Atmospheric compensation with a speckle beacon in strong scintillation conditions: directed energy and laser communication applications
TLDR
Wavefront control experiments in strong scintillation conditions over a 2.33 km, near-horizontal, atmospheric propagation path are presented and mitigation of atmospheric distortions with a speckle beacon typical for directed energy and free-space laser communication applications is demonstrated.Abstract:
Wavefront control experiments in strong scintillation conditions (scintillation index, ≃1) over a 2.33 km, near-horizontal, atmospheric propagation path are presented. The adaptive-optics system used comprises a tracking and a fast-beam-steering mirror as well as a 132-actuator, microelectromechanical-system, piston-type deformable mirror with a VLSI controller that implements stochastic parallel gradient descent control optimization of a system performance metric. The experiments demonstrate mitigation of atmospheric distortions with a speckle beacon typical for directed energy and free-space laser communication applications.read more
Citations
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Journal ArticleDOI
Communicating Using Spatial Mode Multiplexing: Potentials, Challenges, and Perspectives
TL;DR: In this paper, the potentials of harnessing the space as an additional degree of freedom for communication applications including free space optics, optical fiber installation, underwater wireless optical links, on-chip interconnects, data center indoor connections, radio frequency, and acoustic communications are reviewed.
Journal ArticleDOI
Adaptive Array of Phase-Locked Fiber Collimators: Analysis and Experimental Demonstration
TL;DR: In this paper, a coherent fiber array system composed of densely packed fiber collimators with built-in capabilities for adaptive wavefront phase piston and tilt control at each collimator is discussed.
Journal ArticleDOI
Phase correction for a distorted orbital angular momentum beam using a Zernike polynomials-based stochastic-parallel-gradient-descent algorithm
Guodong Xie,Yongxiong Ren,Hao Huang,Martin P. J. Lavery,Nisar Ahmed,Yan Yan,Changjing Bao,Long Li,Zhe Zhao,Yinwen Cao,Moshe J. Willner,Moshe Tur,Samuel J. Dolinar,Robert W. Boyd,Jeffrey H. Shapiro,Alan E. Willner +15 more
TL;DR: The proposed SPGD algorithm based on Zernike polynomials improves the quality of the turbulence-distorted OAM beam and simultaneously correct multiple OAM beams propagating through the same turbulence, and the crosstalk among these modes is reduced by more than 5 dB.
Journal ArticleDOI
Deep turbulence effects mitigation with coherent combining of 21 laser beams over 7 km.
Thomas Weyrauch,Mikhail A. Vorontsov,Joseph Mangano,Vladimir Ovchinnikov,David A. Bricker,Ernst Polnau,Andrey P. Rostov +6 more
TL;DR: This work demonstrates coherent beam combining and adaptive mitigation of atmospheric turbulence effects over 7 km under strong scintillation conditions using a coherent fiber array laser transmitter operating in a target-in-the-loop setting.
Journal ArticleDOI
Performance evaluation of adaptive optics for atmospheric coherent laser communications
TL;DR: It is shown that, when the atmospheric turbulence condition D/r0 is not larger than 1, can the coherent laser communication system works well without the correction of an AO system, and the AO technique has great potential to improve the performances of the atmospheric coherent laser communications.
References
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Journal ArticleDOI
Adaptive Optics in Astronomy
Francois Roddier,Laird Thompson +1 more
TL;DR: An approach to design electro‐optical systems that measure and undo the effects of clear‐air turbulence in real time, delivering near‐diffraction‐limited performance at infrared and visible wavelengths at optical wavelengths.
Journal ArticleDOI
Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction
TL;DR: In this article, a stochastic parallel-gradient descent (SGP) based adaptive wave-front correction algorithm is proposed for high-resolution adaptive wavefront correction, and a performance criterion for parallel-perturbation-based algorithms is introduced and applied to optimize adaptive system architecture.
Journal ArticleDOI
Active optics: A new technology for the control of light
TL;DR: Active optical systems as mentioned in this paper are those in which real-time control over optical wavefronts is employed to optimize system perference in the presence of random distrurbances, such as interference.
Journal ArticleDOI
Adaptive phase-distortion correction based on parallel gradient-descent optimization.
TL;DR: It is demonstrated that adaptive wave-front correction by a parallel stochastic perturbation technique can significantly improve image quality.