Performance analysis of fiber-based free-space optical communications with coherent detection spatial diversity

Li, Kangning; Ma, Jing; Tan, Liying; Yu, Siyuan; Zhai, Chao

doi:10.1364/ao.55.004649

Cited by 37 publications

(11 citation statements)

References 26 publications

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“…It influences the output SNR of combiner using EGC algorithm. If the local oscillator (LO) power is large enough, the system noise is dominated by the shot noise of LO, and the instantaneous output SNR of MRC and EGC can be expressed as [22]:…”

Section: System Modelmentioning

confidence: 99%

Free-Space Optical Communication Based on Mode Diversity Reception Using a Nonmode Selective Photonic Lantern and Equal Gain Combining

et al. 2023

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This paper experimentally investigates the performance of free-space optical (FSO) communication based on mode diversity reception (MDR) using nonmode selective photonic lantern (NSPL) and equal gain combining (EGC). By employing a mode demultiplexer and combining technology in the receiver, the bit error rate (BER) and outage performance of FSO communication system can be significantly improved. However, different from diversity system with multiple receive apertures, the branches in mode diversity system are non-independent fading signals, which are influenced by not only atmospheric but also the modal crosstalk of mode demultiplexer. Therefore, we take into consideration the difference of mode demultiplexer and study four schemes for FSO mode diversity reception system: 1) NSPL with equal gain combining (NSPL-EGC), 2) NSPL with maximal ratio combining (NSPL-MRC), 3) mode selective photonic lantern with equal gain combining (MSPL-EGC), and 4) mode selective photonic lantern with equal gain combining (MSPL-MRC). Experimental results show that NSPL-EGC is the most suitable scheme for MDR with low implementation complexity, and the performance difference is less than 1 dB compared with the one using MRC at BER= 3.8×10 -3 under turbulence from weak to strong.

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Section: System Modelmentioning

confidence: 99%

Free-Space Optical Communication Based on Mode Diversity Reception Using a Nonmode Selective Photonic Lantern and Equal Gain Combining

et al. 2023

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“…When the signal beam transmitted from the transmitter reaches the receiver system after passing through the atmosphere turbulence, it is coupled into the MMF end of the PL. We assume the power received at MMF end of the PL is P M , then we have [33]…”

Section: B Power Distribution In Plmentioning

confidence: 99%

Free-Space Optical Communication Using Non-Mode-Selective Photonic Lantern-Based Coherent Receiver

Zhang

Yuan

Sun

et al. 2021

IEEE Trans. Commun.

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A free-space optical communication system using non-mode-selective photonic lantern (PL) based coherent receiver is studied. Based on the simulation of photon distribution, the power distribution at the single-mode fiber end of the PL is quantitatively described as a truncated Gaussian distribution over a simplex. The signal-to-noise ratios (SNRs) for the communication system using PL based receiver are analyzed using different combining techniques, including selection combining (SC), equal-gain combining (EGC), and maximal-ratio combining (MRC). The integral solution, series lower bound solution and asymptotic solution are presented for bit-error rate (BER) of PL based receiver, single-mode fiber receiver and multimode fiber receiver over the Gamma-Gamma atmosphere turbulence channels.We demonstrate that the power distribution of the PL has no effect on the SNR and BER performance of the PL based receiver when MRC is used; and it only has limited influence when EGC is used. However, the power distribution of the PL can greatly affect the BER performance when SC is used. Besides, the SNR gains of the PL based receiver using EGC over single-mode fiber receiver and multimode fiber receiver are numerically studied under different imperfect device parameters; and the scope of application of the communication system is further provided.

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“…where I n (a, I) is an indicator function defined as To obtain the unconditional BER for coherent FSOC system using PL based receiver with EGC, we rewrite (33) as…”

Section: Appendix Cmentioning

confidence: 99%

Free-Space Optical Communication Using Non-mode-Selective Photonic Lantern Based Coherent Receiver

Zhang

Yuan

Sun

et al. 2020

Preprint

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A coherent free-space optical communication system based on non-mode-selective photonic lantern is studied. Based on simulation of photon distribution, the power distribution at single-mode fiber end of the photonic lantern is quantitatively described as a truncated Gaussian distribution over a simplex. The signal-to-noise and the outage probability are analyzed for the communication system using photonic lantern based receiver with equal-gain combining, and they are compared with those of the single-mode fiber receiver and multimode fiber receiver. The scope of application of the communication system is provided. It is shown that the signal-to-noise ratio gain of the photonic lantern based receiver over singlemode fiber receiver and multimode fiber receiver can be greater than 7 dB. The integral solution, series lower bound solution and asymptotic solution are presented for bit-error rate of photonic lantern based receiver, single-mode fiber receiver and multimode fiber receiver over the Gamma-Gamma atmosphere turbulence channels. Simulation results show that for the considered system the power distribution of the photonic lantern has limited influence on the outage probability and the bit-error rate performance.

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Performance analysis of fiber-based free-space optical communications with coherent detection spatial diversity

Cited by 37 publications

References 26 publications

Free-Space Optical Communication Based on Mode Diversity Reception Using a Nonmode Selective Photonic Lantern and Equal Gain Combining

Free-Space Optical Communication Based on Mode Diversity Reception Using a Nonmode Selective Photonic Lantern and Equal Gain Combining

Free-Space Optical Communication Using Non-Mode-Selective Photonic Lantern-Based Coherent Receiver

Free-Space Optical Communication Using Non-mode-Selective Photonic Lantern Based Coherent Receiver

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