Saturation of Scintillation Magnitude in Near-Earth Optical Propagation*

Deitz, Paul H.; Wright, Neal J.

doi:10.1364/josa.59.000527

Cited by 62 publications

(11 citation statements)

References 6 publications

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“…'s showing r'ipersaturation), otLer recent experimental work by Deitz and Wright (1969) The scatter of the data points in these groups is primarily due to the widths of the class intervals used for C . It may n be noted that the value of maximiun scintillation a is approximately equal to 1.27 and does not depend upon C .…”

Section: Itmentioning

confidence: 89%

Atmospheric Effects upon Laser Eye Safety. Part 1

Johnson¹,

Evans²,

Uthe³

1970

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.. ABSTRACTThe results of cwo laser scintillation'experiments in the atmosphere are presented, as is a revised eye-hazard evaluation procedure incorporating these results. The objective of the research is to determine the influence of atmospheric thermal turbulence on laser eye safety.The cxpertmental work on a 3.5-km near-ground horizontal propagation path was designed to determine the effect of range upon laser scintillation magnitude, represented by the log intensity standard deviation (a).It was found that for very short ranges and low thermal turbulence, the measured values (a ) agree well with theory (a t). However, for longer The second experiment was an attempt to confirm that scintillation saturation occurs on a slant path between a ground-based laser and a receiver on an orbiting aircraft. Some evidence of saturation was found, but the effect was not clearly established because of the limited ranges necessitated by the laser used.

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Section: Itmentioning

confidence: 89%

Atmospheric Effects upon Laser Eye Safety. Part 1

Johnson¹,

Evans²,

Uthe³

1970

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“…The bandwidth of the measured power spectral density was less than 1 kHz. The random process A(u, t) in (1) is well known as a log-normal process [14]- [16]. Let x(u, t) be a stationary Gaussian random process with the autocorrelation function…”

Section: System Modelmentioning

confidence: 99%

“…The weak turbulence in [13] degraded SNR by 16 dB at a BER = 2 × 10 −4 . Experiments showed that the signal scintillation magnitude saturates at a range of about 700 m [14], [15]. No further growth of scintillation magnitude was observed at longer distance.…”

mentioning

confidence: 92%

Optical Communication Using Subcarrier PSK Intensity Modulation Through Atmospheric Turbulence Channels

Li¹,

Liu²,

Qi³

et al. 2007

IEEE Trans. Commun.

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Abstract-This paper studies optical communications using subcarrier phase shift keying (PSK) intensity modulation through atmospheric turbulence channels. The bit error rate (BER) is derived for optical communication systems employing either on/off key (OOK) or subcarrier PSK intensity modulation. It is shown that at BER = 10 −6 and a scintillation level of σ = 0.1, an optical communication system employing subcarrier BPSK is 3 dB better than a comparable system using fixed-threshold OOK. When σ = 0.2, an optical communication system employing subcarrier BPSK achieves a BER = 10 −6 at SNR = 13.7 dB, while the BER of a comparable system employing OOK can never be less than 10 −4 . Convolutional codes are discussed for optical communication through atmospheric turbulence channels. Interleaving is employed to overcome memory effect in atmospheric turbulence channels. An upper bound on BER is derived for optical communication systems employing convolutional codes and subcarrier BPSK modulation.

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“…Che analysis [(Equations (6) and (7)] have been tested only for ranges out to about 1.8 km. 5 ' 6 There are indications that the variance does not remain constant with range after saturation has occurred [Equation (7)], but may, in fact, decrease.…”

Section: It Should Be Emphasized That the Scintillation Equations Usementioning

confidence: 99%

“…The two distributions become markedly dissimilar only for large fluc~uations in an intensity signal. Such fluctuations are not reached, however, because of the saturation effect, and recent experimental data 6 have been inconclusive in tests between the two distributions.…”

mentioning

confidence: 94%

Probability Analysis of Ocular Damage Due to Laser Radiation Through the Atmosphere

Deitz¹

1969

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Saturation of Scintillation Magnitude in Near-Earth Optical Propagation*

Cited by 62 publications

References 6 publications

Atmospheric Effects upon Laser Eye Safety. Part 1

Atmospheric Effects upon Laser Eye Safety. Part 1

Optical Communication Using Subcarrier PSK Intensity Modulation Through Atmospheric Turbulence Channels

Probability Analysis of Ocular Damage Due to Laser Radiation Through the Atmosphere

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