Measurement of the bit-error rate of an adaptive optics, free-space laser communications system, part 1: tip-tilt configuration, diagnostics, and closed-loop results

Tyson, Robert K.; Canning, Douglas E.; Tharp, Jeffrey S.

doi:10.1117/1.2043047

Cited by 26 publications

(9 citation statements)

References 4 publications

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“…The aim of this paragraph is to present a particular type of phase-only correction [8]. The interest of this type of configuration is that only one AO system is necessary, and not two as for the iterative approach.…”

Section: Concept Of Correctionmentioning

confidence: 98%

Mitigation of atmospheric effects by adaptive optics for free-space optical communications

et al. 2009

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Data-rates of long-range free-space optical communication links are deteriorated by atmospheric turbulence which causes power in the bucket fluctuations. In order to compensate for those effects the use of adaptive optics is envisioned. Different solutions have been proposed for the correction. We study here the performances of several compensation methods, encompassing both amplitude and phase and phase-only precompensation. In the case of phase-only precompensation we studied two system designs, one which is dedicated to symmetrical communication systems and the other to dissymmetric systems. In the dissymmetric case we studied two ways of driving the deformable mirror : the use of a Shack-Hartmann wavefront sensor and a model-free phase modulation. For each compensation architecture simulation results covered weak, moderate and strong turbulence conditions.

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Section: Concept Of Correctionmentioning

confidence: 98%

Mitigation of atmospheric effects by adaptive optics for free-space optical communications

et al. 2009

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“…( 2 0 ) The probability of error under influence of optical turbulence and beam wander is given by 16,6 ( )…”

Section: System Bit Error Rate (Ber)mentioning

confidence: 99%

Statistical properties of the received current in FSO systems

Oliveira

2008

SPIE Proceedings

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In this work the statistical distribution of the photocurrent generated at the receiver by detecting a Gaussian beam wave after propagating through the turbulent medium was investigated. The results are presented as photocurrent's relative frequencies obtained by means of computer simulation. It was taken into account the cases where random beam misalignment was present. With knowledge of the photocurrent statistical distribution the system bit error rate (BER), which is an important parameter of a digital communication system, was obtained. An experimental set up was mounted in order to collect data for comparisons with the theoretical results. The normalized relative frequencies of both simulated and measured current were plotted in the same graphic. The distributions have shown to be very similar to each other, what leads to the conclusion that the theory provides reliable results.

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“…Tyson verified the effectiveness of AO for FSOC in theory and experiment. The use of AO can lead to a decrease in the BER of at least two orders of magnitude 5,6 . Takenaka and Toyoshima 7 developed a simulation model of CE under atmospheric turbulence and verified the tracking performance of a fast steering mirror for ground-to-satellite links; the CE was improved by reducing the angle of arrival fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of an adaptive optics system for free-space optics communication through atmospheric turbulence

Wang

et al. 2018

Sci Rep

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The performance of free-space optics communication (FSOC) is greatly degraded by atmospheric turbulence. Adaptive optics (AO) is an effective method for attenuating the influence. In this paper, the influence of the spatial and temporal characteristics of turbulence on the performance of AO in a FSOC system is investigated. Based on the Greenwood frequency (GF) and the ratio of receiver aperture diameter to atmospheric coherent length (D/r0), the relationship between FSOC performance (CE) and AO parameters (corrected Zernike modes number and bandwidth) is derived for the first time. Then, simulations and experiments are conducted to analyze the influence of AO parameters on FSOC performance under different GF and D/r0. The simulation and experimental results show that, for common turbulence conditions, the number of corrected Zernike modes can be fixed at 35 and the bandwidth of the AO system should be larger than the GF. Measurements of the bit error rate (BER) for moderate turbulence conditions (D/r0 = 10, fG = 60 Hz) show that when the bandwidth is two times that of GF, the average BER is decreased by two orders of magnitude compared with fG/f3dB = 1. These results and conclusions can provide important guidance in the design of an AO system for FSOC.

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Measurement of the bit-error rate of an adaptive optics, free-space laser communications system, part 1: tip-tilt configuration, diagnostics, and closed-loop results

Cited by 26 publications

References 4 publications

Mitigation of atmospheric effects by adaptive optics for free-space optical communications

Mitigation of atmospheric effects by adaptive optics for free-space optical communications

Statistical properties of the received current in FSO systems

Performance analysis of an adaptive optics system for free-space optics communication through atmospheric turbulence

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