Free space optical transmission of FM audio/video signals using InGaAs modulating retro-reflectors

Grant, Kevin; Murphy, James L.; Mahon, Rita; Burris, H. R.; Rabinovich, W. S.; Moore, C. I.; Wasiczko, Linda M.; Goetz, Peter G.; Suite, Michele R.; Ferraro, Mike S.; Gilbreath, G. C.; Clare, Bradley A.; Mudge, Kerry A.; Chaffey, Jason

doi:10.1109/commad.2010.5699757

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…A technique employing dual wavelengths has been demonstrated to be effective in mitigating scintillation noise by using common mode rejection to remove co-channel noise [10,11], but the utility of this is limited by the complexity of the system and linearity constraints in the amplitude domain. This constraint was removed by using frequency modulation of a sub-carrier to transmit audio/video signals over a 1.5km terrestrial path [12,13]. This work has now been extended to include bidirectional audio transmission, and has been demonstrated at ranges up to 3km in the maritime environment using a modulating retro-reflector [14].…”

Section: Applicationsmentioning

confidence: 99%

Demodulation of FM Data in Free-Space Optical Communication Systems Using Discrete Wavelet Transformation

Namazi¹,

Burris²,

Charmaine³

et al. 2013

Discrete Wavelet Transforms - A Compendium of New Approaches and Recent Applications

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Free-space optical FSO communications links have the potential to deliver very high bandwidth due to the high carrier frequency as compared with RF links. They have the advantages of being rapidly deployable and less expensive to install than optical fiber systems. The low divergence of laser beams means that FSO systems are intrinsically low in probability of intercept in comparison to RF, and being line-of-sight avoids wasteful use of both the frequency domain bandwidth allocation and the spatial domain. "nother advantage of FSO communication links over RF communications is the large unregulated bandwidth as compared with the heavy traffic and expensive bandwidth allocations for RF links.However, one of the main factors reducing SNR in FSO communications is scintillation noise due to turbulence. "tmospheric turbulence produces temporary pockets of air with slightly different temperatures and pressures, and therefore with slightly different indices of refraction. These turbulence cells act as small, weak lenses that refract the light slightly and cause distortions in the wave front as a laser beam propagates through the atmosphere. The resulting variation in the arrival time of various components of the beam produces constructive and destructive interference at the receiver, causing fluctuations in laser beam intensity. These rapid fluctuations are known as scintillation and occur on a time scale comparable to the time it takes these cells to move across the beam path due to the wind typically on the order of a millisecond . These intensity fluctuations become amplitude fluctuations in the case of analog modulation of the laser beam. In addition, atmospheric turbulence can cause beam break-up and beam wander which can cause very large swings in the average received power, on the

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Section: Applicationsmentioning

confidence: 99%

Demodulation of FM Data in Free-Space Optical Communication Systems Using Discrete Wavelet Transformation

Namazi¹,

Burris²,

Charmaine³

et al. 2013

Discrete Wavelet Transforms - A Compendium of New Approaches and Recent Applications

View full text Add to dashboard Cite

show abstract

“…To overcome the limit, FSO based on cat's eye modulating retro-reflector (CEMRR) is appropriate. US Naval Research Laboratory (NRL) [1]~ [5], Swedish Defence Research Agency [6] and San Diego Research Center [7] have been doing research on CEMRR. The highest communication speed using GaAs/InAlAs [8] multiple quantum well spatial light modulator (SLM) was 45Mbps reported up to now.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of Free Space Optical Communication Based on Cat'S Eye Modulating Retro-Reflector Using Gaas/Algaas Multiple Quantum Well

Sun¹,

Zhang²,

Ren³

et al. 2017

Proceedings of the International Conference on Communication and Electronic Information Engineering (CEIE 2016)

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Cat's eye modulating retro-reflector makes fast ATP, very high speed, small, light and low power consumption free space optical communication link possible. This paper analyzes the principle of free space optical communication based on cat's eye modulating retro-reflector using a multiple quantum well spatial light modulator, and introduces the principle of GaAs/AlGaAs multiple quantum well using as a spatial light modulator. An experiment has been done to test characteristics of a GaAs/AlGaAs multiple quantum well device used as a spatial light modulator. An experimental free space optical communication system based on cat's eye modulating retro-reflector using GaAs/AlGaAs multiple quantum well was built, and a communication link was tested using it with the maximum rate of 50Mbps. The results show that GaAs/AlGaAs contrast ratio is a key factor to the communication link, which is influenced by drive voltage, incidence angle and modulating speed.

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Demonstration of a Monolithically Integrated Hybrid Device for Simultaneous Power Generation and Data Modulation

Kessler-Lewis,

Polly,

Sacchitella

et al. 2024

IEEE J. Photovoltaics

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Free space optical transmission of FM audio/video signals using InGaAs modulating retro-reflectors

Abstract: We report on the free space optical transmission of FM audio/video signals using a 6.3mm diameter InGaAs modulating retro-reflector.

Cited by 4 publications

References 7 publications

Demodulation of FM Data in Free-Space Optical Communication Systems Using Discrete Wavelet Transformation

Demodulation of FM Data in Free-Space Optical Communication Systems Using Discrete Wavelet Transformation

Experimental Research of Free Space Optical Communication Based on Cat'S Eye Modulating Retro-Reflector Using Gaas/Algaas Multiple Quantum Well

Demonstration of a Monolithically Integrated Hybrid Device for Simultaneous Power Generation and Data Modulation

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