Effectiveness of adaptive optics system in satellite-to-ground coherent optical communication

Huang, Jian; Deng, Ke; Liu, Chao; Zhang, Peng; Jiang, Dagang; Yao, Zhoushi

doi:10.1364/oe.22.016000

Cited by 29 publications

(16 citation statements)

References 11 publications

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“…With the aperture increasing continuously, the wave front aberration can degrade the communication performance inevitably, especially for the coherent optical link. An adaptive system installed in the large aperture receiver on the ground can compensate the wave front aberration effectively [24]. To improve the reliability of the communication system in further, a coherent multiple apertures diversity receiving system will be investigated.…”

Section: Discussionmentioning

confidence: 99%

Performance Analysis of Satellite-to-Ground Coherent Optical Communication System with Aperture Averaging

Huang

Wang

et al. 2018

Applied Sciences

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The satellite-to-ground optical communication system suffers from atmosphere turbulence severely. It is well-known that the coherent detection can increase the receiver sensitivity and performing aperture averaging can reduce the scintillation caused by the atmosphere turbulence. In this paper, the bit error rate, the outage probability and the average capacity of a coherent satellite-to-ground optical communication downlink with aperture averaging are analyzed. The Log-normal atmosphere turbulence model and BPSK (Binary Phase Shift Keying) modulation is employed. The analyzing focuses on the improvement of aperture averaging with different atmospheric conditions and zenith angles of the satellite. The bit error rate performance based on measuring data is given too. The results demonstrate the bit error rate and the outage probability can be reduced and the average capacity can be improved by aperture averaging efficiently. When the turbulence is stronger and the zenith angle is larger, the effect of aperture averaging is more obvious. The aperture averaging effect on BER (Bit Error Rate) is better than the effect on average capacity.

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Section: Discussionmentioning

confidence: 99%

Performance Analysis of Satellite-to-Ground Coherent Optical Communication System with Aperture Averaging

Huang

Wang

et al. 2018

Applied Sciences

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“…The mixing efficiency is approximate to the Strehl ratio of the far field of the received beam for homodyne detection, and it is defined by the ratio of the far field encircled energy and the diffraction limited encircled energy [18]. The intensity distribution on the focal plane before correction (detail view) is shown in Fig.…”

Section: The Ber Of the Coherent Fso Systemmentioning

confidence: 99%

“…Li evaluated the performance of the coherent FSO system employing quad- rature array phase-shift keying modulation over the maritime atmosphere with AO system based on SHWFS for atmospheric turbulence compensation [15]. C. Liu and J. Huang analyzed the improvement of BER for the coherent FSO system with AO system based on SHWFS through numerical simulation and experimental data of the 1.8 m telescope with a 127-subaperture SHWFS, under different D/r0 [16][17][18][19]. However, the SHWFS was so sensitive to laser scintillation that the performance was limited seriously for a coherent FSO system.…”

Section: Introductionmentioning

confidence: 99%

BER Analysis of Coherent Free Space Optical Communication Systems with Holographic Modal Wavefront Sensor

Liu

Yao

Huang

et al. 2017

Current Optics and Photonics

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Degradation of bit-error-rate (BER), caused by atmospheric turbulence, seriously hinders the performance of coherent Free Space Optical (FSO) communication systems. An adaptive optics system proves to be effective in suppressing the atmospheric turbulence. The holographic modal wavefront sensor (HMWFS) proposed in our previous work, noted for its fast detecting rates and insensitivity to beam scintillation, is applied to the coherent FSO communication systems. In this paper, based on our previous work, we first introduce the principle of the HMWFS in brief and give the BER of the coherent FSO with homodyne detection in theory, and then analyze the improvement of BER for a coherent FSO system based on our previous simulation works. The results show that the wavefront sensor we propose is better for weak atmospheric turbulence. The most obvious advantages of HMWFS are fast detecting rates and insensitivity to beam scintillation.

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“…Due to the inherent high utilization of the frequency spectrum and the robustness to the intersymbol-interference (ISI), orthogonal frequency division multiplexing (OFDM) technology has been widely studied in optical fiber communications and attracted interests in FSO systems to boost transmission capacity [7]- [9]. Meanwhile, as that coherent detection combined with advanced digital signal processing (DSP) provides higher receiver sensitivity, greater immunity to noise and higher spectrum efficiency than DD [10], it has great potential applications in LEO-StG optical communications and has been paid more and more attentions [11]. Furthermore, result in [12] have shown that the polarization fluctuation caused by the atmospheric turbulence is rather small over the StG link, which validates that the polarization multiplexing is more attractive in LEO-StG optical communications to improve capacity without increasing the bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Phase Uniformly Distributed Circular MQAM Combined With Probabilistic Shaping for PM-CO-OFDM Systems in Satellite-to-Ground Optical Communications

et al. 2019

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Due to the rapid growth of high-resolution services, low earth orbit satellite-toground (LEO-StG) optical communications are expected to provide higher speed and better receiver sensitivity transmission. Here, we propose a phase uniformly distributed circular m-ary quadrature amplitude modulation (MQAM) combined with probabilistic shaping (PS) scheme for polarization multiplexing coherent optical orthogonal frequency-division multiplexing (PM-CO-OFDM) systems in LEO-StG communications to achieve high capacity transmission and improve receiver sensitivity as well as linewidth tolerance. In such scheme, the radius ratio of the circular 16/32QAM is optimized to maximize the minimum Euclidean distance (MED), and the constellation points of each ring are uniformly distributed to maximize the phase space of adjacent constellation points. Besides, the circular 16/32QAM is combined with probabilistic shaping (PS) to further increase the MED under the constraint of average transmit power. Simulation results of such circular 16/32QAM combined with PS scheme under different turbulence channels not only demonstrate its feasibility, but also show the improvements in receiver sensitivity and linewidth tolerance compared with regular 16/32QAM under same entropy. The improvement of receiver sensitivity is also experimentally validated. The superiorities of such scheme make it highly desirable for potential application in long-reach, non-relay, and high capacity LEO-StG optical communications.

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Effectiveness of adaptive optics system in satellite-to-ground coherent optical communication

Cited by 29 publications

References 11 publications

Performance Analysis of Satellite-to-Ground Coherent Optical Communication System with Aperture Averaging

Performance Analysis of Satellite-to-Ground Coherent Optical Communication System with Aperture Averaging

BER Analysis of Coherent Free Space Optical Communication Systems with Holographic Modal Wavefront Sensor

Phase Uniformly Distributed Circular MQAM Combined With Probabilistic Shaping for PM-CO-OFDM Systems in Satellite-to-Ground Optical Communications

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