Performance analysis of a spatial diversity coherent free-space optical communication system based on optimal branch block phase correction

Wang, Liqian; Wang, Jichen; Tang, Xinyu; Chen, Huan; Chen, Xue

doi:10.1364/oe.448956

Cited by 20 publications

(6 citation statements)

References 24 publications

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“…The traditional RF communication technology makes it difficult to meet the growing bandwidth requirements of satellite ground links, recent analytical and experimental studies have contributed to demonstrating the high potential of laser communication, particularly with coherent detection technology, for high data rate satellite-to-ground 1,2 and inter-satellite communications. 3,4 Because satellites are not visible at all times for ground receiving stations, storage and forwarding modes are widely employed at present. To significantly enhance lowlatency communication for future missions and minimize ground station location constraints, optical communication relay node based on inter-satellite coherent detection has been widely studied and experimentally verified its technical feasibility.…”

Section: Introductionmentioning

confidence: 99%

“…A large number of space exploration data, such as high-resolution images, high-definition video, weather prediction data, satellite exploration data, etc., need to be transmitted to the ground in real time for the past few years. The traditional RF communication technology makes it difficult to meet the growing bandwidth requirements of satellite ground links, recent analytical and experimental studies have contributed to demonstrating the high potential of laser communication, particularly with coherent detection technology, for high data rate satellite-to-ground 1 , 2 and inter-satellite communications 3 , 4 . Because satellites are not visible at all times for ground receiving stations, storage and forwarding modes are widely employed at present.…”

Section: Introductionmentioning

confidence: 99%

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Hardware-efficient adaptive equalizer for inter-satellite coherent laser communication systems

Zhao,

Ju,

Liu

et al. 2024

Opt. Eng.

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We present an inter-satellite coherent laser communication prototype system, highlighting a low complexity receiver with a simplified two independent real-valued (TIR) equalizer suitable for space laser communication scenarios. An extensive comparison of classical single complex-valued equalizer, 2 × 2 real-valued equalizer, TIR, and two dependent real-valued (TDR) equalizer is presented on the basis of equalization principles, algorithm performance, and computational complexity. The analysis results show that TIR equalizer has the advantages of low logic resource consumption in implemented on field programmable gate array (FPGA) and zero sensitivity penalty to combat I/Q gain imbalance and I/Q skew caused by device aging. The constant modulus algorithm-based TIR equalizer fits binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or higher-order QAM modulation format, while the traditional complex-valued equalizer needs to customize the tap coefficient updating algorithm for different modulation formats. In addition, to show the feasibility of the proposed TIR equalizer-based coherent laser receiver as a promising candidate for forthcoming inter-satellite networks, we demonstrate single polarization (SP) on-line 2.5 GBaud data rate, QPSK and BPSK coherent transmissions using an FPGA-based transmitter and receiver prototype. Thanks to our proposed equalizer, the number of hardened multipliers is reduced by 47%, while no receiver sensitivity penalty is observed both in numerical simulation and in real-time FPGA experiment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hardware-efficient adaptive equalizer for inter-satellite coherent laser communication systems

Zhao,

Ju,

Liu

et al. 2024

Opt. Eng.

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“…Free-space optical (FSO) communication is widely employed in inter-satellite links, satellite-ground links, and communication between various flight platforms and terrestrial stations due to the advantages of high speed, high security, small equipment size, and no requirement of a spectrum license [1][2][3][4]. However, the atmospheric refractive index fluctuates randomly, resulting in an atmospheric turbulence effect [5]. It will severely deteriorate the laser beam and limit the FSO transmission distance or the communication bit rate.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals

et al. 2022

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Orthogonal frequency division multiplexing (OFDM) technology is presented for use in free-space optical (FSO) communications accompanied by the spatial diversity reception. Using quadrature phase shift keying (QPSK) modulation formats, the OFDM signals show robustness to support high spectral efficiency and compatibility with the spatial diversity reception to improve receiver sensitivity. Compared with the single-carrier QPSK signal, the OFDM-QPSK signal with 64 sub-carriers can reduce the BER from 2.87 × 10−3 to 2.98 × 10−4 at the SNR of 6 dB. Using a two-aperture spatial diversity reception with OFDM, the BER can be reduced from 2.45 × 10−3 of a single receiver to 6.10 × 10−4 under moderate turbulence conditions. Under strong turbulence, the BER of the single receiver is 2.14 × 10−2. It can be improved to 1.16 × 10−3 by using four-aperture receivers, and even 6.87 × 10−4 by using six-aperture receivers. The optimized aperture number should be selected according to channel conditions.

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“…Intensity modulation and direct detection (IM-DD) are utilized in non-coherent systems, which have the advantages of simplicity of structure and high reliability (although with undesirable levels of reception sensitivity) [12]. By contrast, coherent communication systems, which combine phase modulation with coherent detection, deploy the coherent superposition of local-oscillator (LO) and signal optical fields, supporting high sensitivity, high modulation rates, and strong anti-interference capability [13,14]. Coherent communication modes mainly consist of binary phase shift keying (BPSK) and differential phase shift keying (DPSK).…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity multi-channel DPSK system with real-time phase lock controller for free-space optical communication

Gao

Xie

et al. 2022

Front. Phys.

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To overcome the power jitters in satellite-to-ground communications caused by atmospheric turbulence, a type of DPSK free-space communication system, assisted by a self-designed real-time phase lock controller, has been established. The system can effectively compensate for power swings in communication links and hence achieve high sensitivity. The wavelength division multiplexing technique is applied to a four-channel DPSK system to provide greater link capacity. With the data rate of a single channel as 2.5 Gbps and unencoded BER as 1 × 10–3, reception sensitivity has been obtained at −53.58 dBm (13.69 photons/bit), −53.59 dBm (13.66 photons/bit), −53.61 dBm (13.59 photons/bit), and −53.63 dBm (13.53 photons/bit) for each independent channel, respectively. The gap between our sensitivity result and the theoretical limit has narrowed to about −3.5 dB. Simultaneously, the DPSK receiver, with our self-designed phase lock controller, has stabilized reception of optical power fluctuations that range from 0 to 40 dB. Additionally, the impact of a four-wave mixing effect on multi-channel system performance has been investigated in detail. Our experimental results present a novel solution for the superior performance of free-space communication links.

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Performance analysis of a spatial diversity coherent free-space optical communication system based on optimal branch block phase correction

Cited by 20 publications

References 24 publications

Hardware-efficient adaptive equalizer for inter-satellite coherent laser communication systems

Hardware-efficient adaptive equalizer for inter-satellite coherent laser communication systems

Performance Improvement of the Free-Space Optical Communication Link Using Spatial Diversity Reception-Assisted OFDM Signals

High-sensitivity multi-channel DPSK system with real-time phase lock controller for free-space optical communication

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