Optical Channels

Karp, Sherman; Gagliardi, R.; Moran, Steven E.; Stotts, Larry B.

doi:10.1007/978-1-4899-0806-3

Cited by 159 publications

(77 citation statements)

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“…For weak turbulence, the intensity fluctuation probability density function (pdf) is modeled as a log-normal distribution, which has been validated through experimental measurements [2], [4], [14]. The log-amplitude of the optical intensity has a Gaussian pdf with log-amplitude variance σ 2 X given by [2] …”

Section: A Atmospheric Statistical Modelsmentioning

confidence: 99%

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Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors

Farid

Hranilovic

2007

J. Lightwave Technol.

1,333

927

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Abstract-We investigate the performance and design of free-space optical (FSO) communication links over slow fading channels from an information theory perspective. A statistical model for the optical intensity fluctuation at the receiver due to the combined effects of atmospheric turbulence and pointing errors is derived. Unlike earlier work, our model considers the effect of beam width, detector size, and jitter variance explicitly. Expressions for the outage probability are derived for a variety of atmospheric conditions. For given weather and misalignment conditions, the beam width is optimized to maximize the channel capacity subject to outage. Large gains in achievable rate are realized versus using a nominal beam width. In light fog, by optimizing the beam width, the achievable rate is increased by 80% over the nominal beam width at an outage probability of 10 −5 . Well-known error control codes are then applied to the channel and shown to realize much of the achievable gains.Index Terms-Atmospheric turbulence, beam misalignment, free-space optical (FSO) communications, optical channel capacity, outage probability, pointing errors.

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Section: A Atmospheric Statistical Modelsmentioning

confidence: 99%

“…Atmospheric turbulence causes fluctuations in both the intensity and the phase of the received signal due to variations in the refractive index along the propagation path [2]. Many statistical models have been proposed to describe this fluctuation in both weak and strong fading regimes [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors

Farid

Hranilovic

2007

J. Lightwave Technol.

1,333

927

View full text Add to dashboard Cite

show abstract

“…Similarly, FSO systems have great potential on improving channel usage when implemented with coherent detection [6]. One scheme of coherent FSO detection is called homodyne detection, where the receiver demodulates the optical signal directly to the baseband because the local oscillator laser frequency is synchronized to the optical signal carrier frequency.…”

Section: Preliminaries On Coherent Free-space Optical Communicationsmentioning

confidence: 99%

“…In early studies of FSO communications, the log-normal distribution was used as the turbulence model [6], [17]- [22]. Although the log-normal distribution is one of the most widely used turbulence models, this PDF is only applicable for weak turbulence conditions.…”

Section: Literature Reviewmentioning

confidence: 99%

“…This is a significant difference from the intensity modulated FSO systems, for which background and thermal noise are the dominant factors affecting the error rate performance. Some comprehensive references to early work in this coherent FSO area can be found in [6] and [36]. Recently, a comparison study was carried out by Lee and Chan [18] and showed performance improvement of coherent detection over IM/DD detection in a log-normal environment.…”

Section: Literature Reviewmentioning

confidence: 99%

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