Scintillation and transmitter-aperture averaging over vertical paths*

Titterton, Paul J.

doi:10.1364/josa.63.000439

Cited by 21 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12 6 Ratio of the rms deviation calculated for the spectrum 14 given in eq. (23) to the rms deviation calculated for the von Karman spectrum ( p= 11/6).…”

mentioning

confidence: 99%

Effects of random path fluctuations on the accuracy of laser ranging systems

Gardner

1976

Appl. Opt.

View full text Add to dashboard Cite

“…12 6 Ratio of the rms deviation calculated for the spectrum 14 given in eq. (23) to the rms deviation calculated for the von Karman spectrum ( p= 11/6).…”

mentioning

confidence: 99%

Effects of random path fluctuations on the accuracy of laser ranging systems

Gardner

1976

Appl. Opt.

View full text Add to dashboard Cite

“…Asymptotes (22) and (24) are valid approximations for the scintillation index for C r a < and C r a > accordingly. (22) and (24).…”

Section: Pif Fluctuationmentioning

confidence: 99%

“…PIF given by equation (39) has the form of the power flux through the aperture, and is subject to the aperture averaging effect. This effect has been studied extensively [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] from 1950's, mostly for the weak scintillation conditions. Comprehensive analysis of scintillation averaging was given in [31] both for weak and strong turbulence.…”

Section: Note Thatmentioning

confidence: 99%

“…For the extended turbulence we show that the reciprocity principle makes it possible to use the available results for the beam scintillation [15] to calculate the PIF fluctuation variance for weak and strong scintillation conditions. Specifically we show that the conventional theory of the scintillation averaging [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] does not apply to the wave-to-fiber coupling situation, and that the phase fluctuation of the incident wave governs the PIF fluctuation for larger receiver apertures.…”

Section: Introductionmentioning

confidence: 99%

“…see(22)), and does not contribute substantially to the scintillation index. Fluctuation at the fiber face is determined simply by the power flux fluctuation through the entrance pupil and is equal to the incident wave…”

mentioning

confidence: 96%

See 2 more Smart Citations

Coupling turbulence-distorted wave front to fiber: wave propagation theory perspective

Charnotskii

2010

Free-Space Laser Communications X

View full text Add to dashboard Cite

We use the results of the theory of wave propagation in turbulence to analyze the effects of the atmospheric turbulence on the Free-Space Optical Communication systems under weak and strong scintillation conditions. We found that for the traditional fiber coupling arrangement statistics of the Power-in-Fiber (PIF) is sensitive to the phase fluctuation at the collecting aperture, rather than amplitude fluctuation (scintillation). Larger receiving aperture produces stronger PIF fluctuation. Similar to the scintillation of the sharp focused beams second-order scattering dominates PIF fluctuation for the weak and strong scintillation conditions. This should have serious effect on the probability distribution of the PIF.A new coupling arrangement is suggested that alleviates the destructive effect of the phase fluctuation, and allows the use of large receiving apertures. The trade-off is the decreased coupling efficiency. For our new coupling scheme the PIF fluctuation is determined by the power flux fluctuation through the collecting aperture. This allows taking advantage of the scintillation averaging effect to suppress the fading. We review the results of the rigorous Markov-approximationbased theory of the scintillation averaging that is valid both for a weak and strong scintillation conditions. This technique reveals several distinct regimes of the power flux fluctuation including the situation where fluctuation is relatively small, but is not described by the perturbation (Rytov's) theory. We also show how the energy conservation principle inherent to the wave propagation in the clear air turbulence provides an accelerated rate of the scintillation averaging compare to the typical averaging estimates.

show abstract