Characterization of data transmission through a maritime free-space optical channel with a custom bit error rate tester

Sluz, Joseph E.; Riggins, James L.; Juarez, Juan C.; Sova, Raymond M.; Young, David W.; Nelson, Charles

doi:10.1117/12.852642

Cited by 9 publications

(10 citation statements)

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“…In 2009, the Johns Hopkins University and Johns Hopkins University Applied Physics Laboratory initiated and executed an internal research and development effort to assess, demonstrate, and advance hybrid RF/optical communication links in the maritime environment. This research effort was successful and has been described at length in a number of references, see [2,[5][6][7]. In this paper, we focus specifically on the probability density function (PDF) of the laser beam intensity in comparison with theoretical models.…”

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confidence: 99%

Probability density functions of power-in-bucket and power-in-fiber for an infrared laser beam propagating in the maritime environment

et al. 2013

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Irradiance fluctuations of an infrared laser beam from a shore-to-ship data link ranging from 5.1 to 17.8 km are compared to lognormal (LN), gamma-gamma (GG) with aperture averaging, and gamma-Laguerre (GL) distributions. From our data analysis, the LN and GG probability density function (PDF) models were generally in good agreement in near-weak to moderate fluctuations. This was also true in moderate to strong fluctuations when the spatial coherence radius was smaller than the detector aperture size, with the exception of the 2.54 cm power-in-bucket (PIB) where the LN PDF model fit best. For moderate to strong fluctuations, the GG PDF model tended to outperform the LN PDF model when the spatial coherence radius was greater than the detector aperture size. Additionally, the GL PDF model had the best or next to best overall fit in all cases with the exception of the 2.54 cm PIB where the scintillation index was highest. The GL PDF model also appears to be robust for off-of-beam center laser beam applications.

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confidence: 99%

Probability density functions of power-in-bucket and power-in-fiber for an infrared laser beam propagating in the maritime environment

et al. 2013

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“…The results are shown in Figure 3. Although these measurements did not use a packet transmission scheme, the number of error free intervals of lengths between one microsecond and a few hundreds of milliseconds was recorded using a 127 bit long pseudorandom bit sequence as in reference [7] and found to be in good agreement with this crude measure of channel availability.…”

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confidence: 96%

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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“…For data throughput characterization of bursty channels such as FSO links, JHU/APL developed a custom bit error rate tester (cBERT) since commercial error detectors are not well suited for these types of channels [25]. The cBERT can synchronize in as little as 320 bits, output digital pulses in real-time when an error is detected, and provide an assortment of bit and 1 μs block error statistics via a serial interface at 25-100 ms intervals.…”

Section: Link Budgetmentioning

confidence: 99%

“…For analysis of data throughput with channel fades, the analog pulses (100 μs long for this test) are especially useful as they can be recorded along with the received power in fiber (PIF) into the MMAGC to evaluate when and how long errors last in relation to the channel fade. A data collection system logged various channels for all test runs at 20 kSamples/sec including the total input optical power to the MMAGC (PIF), the output optical power out of the MMAGC and into the APD, also referred to as power out of fiber (POF), and 100 μs error pulses from the cBERT [25]. results for the longest run tested ranging from 90-132 km.…”

Section: Link Budgetmentioning

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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Characterization of data transmission through a maritime free-space optical channel with a custom bit error rate tester

Cited by 9 publications

References 0 publications

Probability density functions of power-in-bucket and power-in-fiber for an infrared laser beam propagating in the maritime environment

Probability density functions of power-in-bucket and power-in-fiber for an infrared laser beam propagating in the maritime environment

Channel fade modeling for free-space optical links

Observations of atmospheric effects for FALCON laser communication system flight test

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