Free-space laser communications with adaptive optics: Atmospheric compensation experiments

Weyrauch, Thomas; Vorontsov, Mikhail A.

doi:10.1007/978-0-387-28677-8_5

Cited by 40 publications

(21 citation statements)

References 24 publications

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“…Wavefront control in these systems can be based on the cooperative sharing of the metric information. 16 In these system types, wavefront control in both remotely located systems is performed using optimization of metrics measured locally and sent to other location via an optical or rf communication link. These systems can use asynchronous cluster SPGD control without the need for synchronization of clocks at both AO system locations.…”

Section: Resultsmentioning

confidence: 99%

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Adaptive wavefront control with asynchronous stochastic parallel gradient descent clusters

Vorontsov

Carhart

2006

J. Opt. Soc. Am. A

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A scalable adaptive optics (AO) control system architecture composed of asynchronous control clusters based on the stochastic parallel gradient descent (SPGD) optimization technique is discussed. It is shown that subdivision of the control channels into asynchronous SPGD clusters improves the AO system performance by better utilizing individual and/or group characteristics of adaptive system components. Results of numerical simulations are presented for two different adaptive receiver systems based on asynchronous SPGD clustersone with a single deformable mirror with Zernike response functions and a second with tip-tilt and segmented wavefront correctors. We also discuss adaptive wavefront control based on asynchronous parallel optimization of several local performance metrics-a control architecture referred to as distributed adaptive optics (DAO). Analysis of the DAO system architecture demonstrated the potential for significant increase of the adaptation process convergence rate that occurs due to partial decoupling of the system control clusters optimizing individual performance metrics.

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Section: Resultsmentioning

confidence: 99%

“…(14)- (16). The computations of the control voltage update in the asynchronous SPGD clusters were performed using Eq.…”

Section: B Adaptive Optical Receiver With Segmented and Tip-tilt Mirmentioning

confidence: 99%

Adaptive wavefront control with asynchronous stochastic parallel gradient descent clusters

Vorontsov

Carhart

2006

J. Opt. Soc. Am. A

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“…The main technique to counterbalance the degrading effects of receiving the optical wave off-axis, is by the combination of fast steering mirrors and adaptive optics algorithms (Levine et al, 1998;Tyson, 2002;Weyrauch & Vorontsov, 2004).…”

Section: Angle-of-arrival Fluctuationsmentioning

confidence: 99%

Wireless Optical Communications Through the Turbulent Atmosphere: A Review

Barrios¹,

Dios²

2012

Optical Communications Systems

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“…2. The density of the atmosphere falls exponentially, with altitude above the Mean Sea Level (MSL) [7]. The temperature variations give rises to optical effects of turbulence in the troposphere, below about 10 km.…”

Section: Atmospheric Turbulence Effects -Analysismentioning

confidence: 99%

“…The major limitation of TFSPPLC is the atmosphere. Atmospheric condition ultimately determines the TFSPPLC systems performance not only of terrestrial applications but also for uplink-downlink [6,7]. This work addresses a comprehensive experimental treatment for the analysis of the atmospheric effects and performance of the system developed.…”

Section: Introductionmentioning

confidence: 99%

Lower-order adaptive beam steering system in terrestrial free space point-to-point laser communication using fine tracking sensor

Raj¹,

Selvi²

2011

2011 International Conference on Signal Processing, Communication, Computing and Networking Technologies

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The Terrestrial Free Space Point to Point Laser Communication (TFSPPLC) offers an attractive alternatives for transferring high -bandwidth data. The wave propagation takes place in optically inhomogeneous atmospheric channel. Various deleterious effects of the atmospheric channel leads the optical wave to serious signal fading, misalignments of fixed position and even complete loss of signal altogether. Therefore, understanding the atmospheric behavior to the optical wave propagation with the real time experimental data collected over long duration become significant. A TFSPPLC opto-electronic architecture is established for the range of 500m and 28.5m altitude above the surface of the earth. An Adaptive Optics (AO) based steering technique is incorporated in the experimental test-bed to mitigate the lower order temporal and spatial distortions measured at the receiver aperture. The technique of incorporating 2 Dimensional -4 Quadrant fine tracking sensor (2D-4QS) and Fast Steering Tip-Tilt Mirror (FSTTM) in the adaptive receiver in a closed loop control configuration is presented. An Adaptive Fuzzy Logic Controller (AFLC) is developed in the Field Programmable Gate Array (FPGA) and its performance is tested in real time with generating the control signal to drive the piezoelectric actuators of FSTTM. The method of compensating the atmospheric effects using FSTTM is described. The statistical analyses of the experimental data are also presented.

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Free-space laser communications with adaptive optics: Atmospheric compensation experiments

Cited by 40 publications

References 24 publications

Adaptive wavefront control with asynchronous stochastic parallel gradient descent clusters

Adaptive wavefront control with asynchronous stochastic parallel gradient descent clusters

Wireless Optical Communications Through the Turbulent Atmosphere: A Review

Lower-order adaptive beam steering system in terrestrial free space point-to-point laser communication using fine tracking sensor

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