Long range field testing of free space optical communications terminals on mobile platforms

Cunningham, James; Foulke, Dennis; Goode, Tim; Baber, Dan; Gaughan, Brian; Fletcher, Matthew L. M.; Young, David W.; Juarez, Juan C.; Sluz, Joseph E.; Riggins, James L.

doi:10.1109/milcom.2009.5379846

Cited by 15 publications

(9 citation statements)

References 1 publication

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“…A recent series of measurements of performance of a four inch aperture FSO terminal with tilt-tip compensation over a 10 -50 km optical path was conducted at a test range in New Mexico [6]. Light collected by the telescope was coupled into a 50 micron core diameter multi-mode optical fiber and photodetected using an APD and trans-impedance amplifier.…”

Section: Results Obtained With the Modelmentioning

confidence: 99%

Channel fade modeling for free-space optical links

Davidson

Juan

Hammons

2010

2010 - Milcom 2010 Military Communications Conference

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A recent series of experimental measurements over atmospheric channels using an optical receiver with tilt-tip control revealed that the first order statistics were well described by a log-normal probability density function under some conditions. The second order statistics in the form of the covariance function for the natural logarithm of the normalized optical intensity were observed to be well described by a double exponential decay. This paper presents a model for the channel in terms of a pair of stochastic differential equations which can be numerically evolved in time to produce time records of faded normalized optical intensities. The first and second order statistics of the faded intensity can be matched to those actually observed in the real channel. These simulated records can then be used to design free-space optical receivers that employ packet retransmission and or forward error corrective coding architectures.

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Section: Results Obtained With the Modelmentioning

confidence: 99%

Channel fade modeling for free-space optical links

Davidson

Juan

Hammons

2010

2010 - Milcom 2010 Military Communications Conference

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“…Prior papers focused on the architecture, build, assembly and initial test of FALCON [11,12,13,14,15,16]. Some recent reports have discussed specific aspects of the latest field test including system improvements and the use of packet transmission data to customize and optimize forward error correcting (FEC) codes [17,18,19].…”

Section: Progressmentioning

confidence: 99%

Observations of atmospheric effects for FALCON laser communication system flight test

et al. 2011

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Free-space optical communication terminals have been designed and extensively tested in various configurations. The FALCON terminals are designed to operate on large unmanned airborne vehicles (UAVs) or piloted aircraft. They provide a secure, two-way air-to-air and air-to-ground data link. In the latest flight test a successful 132km link was established. The beacon lasers operated at half of their available power, which was sufficient to establish and maintain link for the full flight track. The data and beacon links remained locked for approximately 30 minutes during which both aircraft turned, banked, and experienced air turbulence. This demonstration proved that laser communications is possible with tip-tilt correction as the primary control system compensation. It further demonstrated that compact, low cost free-space optical communications are now available for test and evaluation of operational scenarios.

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“…For longer distances and outdoor environments, the presence of atmospheric turbulence and weather can produce signal fade or loss for traditional FSO designs. Solutions that increase the transmitter power, the collecting area of the receiver, or the number of spatially diverse transmitter-receiver pairs [1][2][3][4][5][6][7][8][9] have limited utility in the mobile scenario by practical limits on the size, weight, and power consumption (SWaP) of the mobile transceivers that are imposed by the moving platform's capabilities. While several design solutions have been proposed to address these issues, there remains room for new FSO system designs to further improve upon the performance of mobile FSO.…”

Section: Introductionmentioning

confidence: 99%

Wavelength dependence of a fiber-bundle based FSO link

LoPresti

Hutchins

Kohrmann

et al. 2014

2014 IEEE Globecom Workshops (GC Wkshps)

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A transmitter and receiver design based on the use of fiber optic bundles have been proposed and studied both experimentally in the laboratory and theoretically through simulation, and have shown promise for providing enhanced functionality in mitigating the effects of turbulence and weather on the pointing, acquisition and tracking problem. In this paper, the operation of an FSO link constructed from these designs is analyzed under similar environmental conditions but transmitting at two different wavelengths. A transmitter with a linear fiber array transmitted over a brick surface at either 1310 nm or 1550 nm wavelength to a receiver constructed using a hexagonal array of 19 fibers located 15 feet away. Data at 100 kb/s was transmitted across the link and the collected signal was recorded for off-line statistical analysis, including achieved biterror rate. The investigation finds that, when eliminating effects due to artifacts in source operation, dependence of link operation on wavelength is minimal, even though the optical alignment was optimized for only 1550 nm.

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Long range field testing of free space optical communications terminals on mobile platforms

Cited by 15 publications

References 1 publication

Channel fade modeling for free-space optical links

Channel fade modeling for free-space optical links

Observations of atmospheric effects for FALCON laser communication system flight test

Wavelength dependence of a fiber-bundle based FSO link

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