Temporal broadening of optical pulses propagating through non-Kolmogorov turbulence

Chen, Chun-Yi; Yang, Huamin; Yan, Lianshan; Tong, Shoufeng; Liu, Rencheng

doi:10.1364/oe.20.007749

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…In other words, the transmittance introduced by pulse broadening is actually negligible in the regime of weak turbulence. However, in the regime of strong turbulence, the analysis of equation (18) requires a large amount of numerical calculations [34]. In [34], the results also show that broadening is only perceptible on the order of femtosecond in strong turbulence, i.e., the broadening-induced transmittance approaches one, thus negligible.…”

Section: Transmittance: Temporal Pulse Broadeningmentioning

confidence: 95%

“…However, in the regime of strong turbulence, the analysis of equation (18) requires a large amount of numerical calculations [34]. In [34], the results also show that broadening is only perceptible on the order of femtosecond in strong turbulence, i.e., the broadening-induced transmittance approaches one, thus negligible. Therefore, there is no need to consider the transmittance change caused by pulse broadening in the following performance analysis in section 4.…”

Section: Transmittance: Temporal Pulse Broadeningmentioning

confidence: 95%

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Atmospheric effects on continuous-variable quantum key distribution

et al. 2018

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Compared to fiber continuous-variable quantum key distribution (CVQKD), atmospheric link offers the possibility of a broader geographical coverage and more flexible transmission. However, there are many negative features of the atmospheric channel that will reduce the achievable secret key rate, such as beam extinction and a variety of turbulence effects. Here we show how these factors affect performance of CVQKD, by considering our newly derived key rate formulas for fading channels, which involves detection imperfections, thus form a transmission model for CVQKD. This model can help evaluate the feasibility of experiment scheme in practical applications. We found that performance deterioration of horizontal link within the boundary layer is primarily caused by transmittance fluctuations (including beam wandering, broadening, deformation, and scintillation), while transmittance change due to pulse broadening under weak turbulence is negligible. Besides, we also found that communication interruptions can also cause a perceptible key rate reduction when the transmission distance is longer, while phase excess noise due to arrival time fluctuations requires new compensation techniques to reduce it to a negligible level. Furthermore, it is found that performing homodyne detection enables longer transmission distances, whereas heterodyne allows higher achievable key rate over short distances. heterodyne detection. Based on the deduced key rate formula, we consider three key parameters that affect the key rate. First, the transmittance change due to beam extinction [21] and turbulence effects (temporal pulse broadening, beam wandering, broadening, deformation, and scintillation) [22] are considered, where extinction likes the attenuation in an optical fiber. Our results demonstrate that beam wandering, broadening and deformation are the main turbulence effects affecting the achievable key rate. Second, we consider the communication interruption caused by angle-of-arrival fluctuations [20], and we found that the interruption probability is noticeable in the case of long-distance transmission. Third, we estimate the excess noise caused by pulse arrival time fluctuations which is found to be quite large. Based on the impacts mentioned above, we conduct a performance analysis.This paper is organized as follows. In section 2, we deduce the achievable secret key rate over the atmospheric channel. In section 3, with the result of section 2, we show how atmospheric effects affect the performance of GMCS CVQKD. In section 4, We consider all the implications mentioned in section 3 and perform a performance analysis. Finally we come to the conclusion and discussion in section 5.

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Section: Transmittance: Temporal Pulse Broadeningmentioning

confidence: 95%

Section: Transmittance: Temporal Pulse Broadeningmentioning

confidence: 95%

Atmospheric effects on continuous-variable quantum key distribution

et al. 2018

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“…We will discuss some of these results below on considering the applications. The evolution of the second-order statistics of non-stationary (pulsed) fields in non-Kolmogorov turbulence was treated in [98,99].…”

Section: Theoretical Predictions For Non-classic Turbulence-light Interactionsmentioning

confidence: 99%

Non-Classic Atmospheric Optical Turbulence: Review

Korotkova

Toselli

2021

Applied Sciences

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Theoretical models and results of experimental campaigns relating to non-classic regimes occurring in atmospheric optical turbulence are overviewed. Non-classic turbulence may manifest itself through such phenomena as a varying power law of the refractive-index power spectrum, anisotropy, the presence of constant-temperature gradients and coherent structures. A brief historical introduction to the theories of optical turbulence, both classic and non-classic, is first presented. The effects of non-classic atmospheric turbulence on propagating light beams are then discussed, followed by the summary of results on measuring the non-classic turbulence, on its computer and in-lab simulations and its controlled synthesis. The general theory based on the extended Huygens–Fresnel method, capable of quantifying various effects of non-classic turbulence on propagating optical fields, including the increased light diffraction, beam profile deformations, etc., is then outlined. The review concludes by a summary of optical engineering applications that can be influenced by atmospheric non-classic turbulence, e.g., remote sensing, imaging and wireless optical communication systems. The review makes an accent on the results developed by the authors for the recent AFOSR MURI project on deep turbulence.

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“…For the 3D image, studying on the ELPP affected by atmospheric turbulence is significant to improve resolution and accuracy in practical applications [11]. To the best of our knowledge, previous studies have shown that the ELPP is mainly affected by the response of detectors [12], targets shape [13] and atmosphere, etc [14]. Although previous studies have presented relative results on the ELPP affected by targets [5,15,16], the results are based on the assumption of neglecting effect from atmospheric turbulence.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical approaches to study echo laser pulse profile affected by target and atmospheric turbulence

et al. 2016

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The integrated model of echo laser pulse profile (ELPP) of a target with arbitrary shape is studied under the condition of the ELPP affected by target and atmospheric turbulence simultaneously. The ELPPs of four typical targets (a plane, a cone, a sphere and an aspherical surface) are employed to test the validity of the model by analytical and numerical approaches. Based on simulations of the ELPP under different targets and atmospheric turbulence intensity, the results show a good agreement between two methods, and the ELPP of a target with discontinuous surface is more easily affected by atmospheric turbulence than that with a continuous surface. Besides that, we study the relationship between the number of grids and the relative error of analytical and numerical approaches, which are of interest to obtain the optimal number of grids used in the simulations.

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Temporal broadening of optical pulses propagating through non-Kolmogorov turbulence

Cited by 16 publications

References 16 publications

Atmospheric effects on continuous-variable quantum key distribution

Atmospheric effects on continuous-variable quantum key distribution

Non-Classic Atmospheric Optical Turbulence: Review

Analytical and numerical approaches to study echo laser pulse profile affected by target and atmospheric turbulence

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