Mitigation of Scintillation in FSOC Using RSOA-Based Spectrum-Sliced Incoherent Light

Lee, Daeseong; Vuong, V.; Kim, Hoon

doi:10.1109/lpt.2021.3053565

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…2 shows the values of P 2 c obtained by using ( 11) and ( 15) as a function of D/r 0 . The ratio D/r 0 is used to indicate the strength of atmospheric turbulence [15], [16]. Most previously reported theoretical works on the coupling efficiency also employ this ratio [12], [13], [14].…”

Section: ) Spatial Filter Functionmentioning

confidence: 99%

“…The figure shows clearly that the value of P 2 c diverges to infinity as the strength of turbulence gets higher. Also, due to the productive term (1 − k κ 2 L sin κ 2 L k ) contained in the integrand of (16), this tendency becomes more pronounced as the propagation distance L increases. This problem is originated from the fact that ( 12) is derived from the perturbation theory assuming weak turbulence.…”

Section: ) Spatial Filter Functionmentioning

confidence: 99%

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Standard Deviation of Fiber-Coupling Efficiency for Free-Space Optical Communication Through Atmospheric Turbulence

Moon

Kim

2023

IEEE Photonics J.

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In fiber-based optical receivers such as coherent receiver, the optical signal reaching the receiver's aperture is coupled to the optical fiber through a set of lenses. Due to atmospheric turbulence, however, the coupling efficiency, which is defined by the ratio of the fiber-coupled optical power to the optical power reaching the aperture, fluctuates over time, and thus should be treated as a random variable. Previous theoretical works predict the average coupling efficiency accurately, but fail to estimate the standard deviation, especially when the turbulence is strong. In this study, we propose new theoretical formulas for the standard deviation of coupling efficiency applicable to a wide range of turbulence conditions. For this purpose, we derive a new approximated formula for the second moment of coupling efficiency using the second-order Taylor expansion. Next, a new formula for the second moment of coupled optical power is developed by introducing the spatial filter to the fourth-order coherence function. The computer simulation is carried out to evaluate the accuracy of the formulas. The results show that our formulas agree with the simulation results over a wide range of turbulence strength. Also, the new formulas provide better accuracy than the previously reported ones.

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Section: ) Spatial Filter Functionmentioning

confidence: 99%

Section: ) Spatial Filter Functionmentioning

confidence: 99%

Standard Deviation of Fiber-Coupling Efficiency for Free-Space Optical Communication Through Atmospheric Turbulence

Moon

Kim

2023

IEEE Photonics J.

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“…Consequently, it causes random fluctuations in received signal intensity. Thus, the effect of atmospheric turbulence should be considered, and scintillation mitigation methods have been studied accordingly [11][12][13]. The present investigation is based on two aspects: first, a rapid increase in scintillation index with a slight increment in pointing error [14]; second, less affection by scintillation in a larger beam width due to the broad beam propagation from spherical wave to plane wave [15].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Beam Divergence Control to Mitigate Scintillation Effect Caused by Pointing Error in Vertical FSO Transmissions

Park

Hyun

Han

2023

Sensors

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Free-space optical (FSO) communication has been studied for next-generation network systems. Because an FSO system establishes point-to-point communication links, maintaining alignment among the transceivers is a critical challenge. In addition, atmospheric turbulence causes significant signal loss in FSO vertical links. Even in clear weather conditions, transmitted optical signals suffer significant scintillation losses due to random variations. Thus, the effect of atmospheric turbulence should be considered in vertical links. In this paper, we analyze the relationship between pointing error and scintillation from the aspect of beam divergence angle. Furthermore, we propose an adaptive beam that optimizes its divergence angle according to the pointing error between the communicating optical transceivers to mitigate the effect of scintillation due to pointing error. We performed a beam divergence angle optimization and compared it with adaptive beamwidth. The proposed technique was demonstrated using simulations, which revealed an enhanced signal-to-noise ratio and the mitigation of the scintillation effect. The proposed technique would be useful in minimizing the scintillation effect in vertical FSO links.

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Ultra-fast AND gate using single semi-reflective quantum dot semiconductor optical amplifier

Mukherjee

2023

Photon Netw Commun

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Mitigation of Scintillation in FSOC Using RSOA-Based Spectrum-Sliced Incoherent Light

Cited by 7 publications

References 20 publications

Standard Deviation of Fiber-Coupling Efficiency for Free-Space Optical Communication Through Atmospheric Turbulence

Standard Deviation of Fiber-Coupling Efficiency for Free-Space Optical Communication Through Atmospheric Turbulence

Adaptive Beam Divergence Control to Mitigate Scintillation Effect Caused by Pointing Error in Vertical FSO Transmissions

Ultra-fast AND gate using single semi-reflective quantum dot semiconductor optical amplifier

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