Modulating retro-reflectors for space, tracking, acquisition, and ranging using multiple quantum-well technology

Gilbreath, G. C.; Creamer, N. Glenn; Rabinovich, William S.; Meehan, Timothy J.; Vilcheck, Michael J.; Vasquez, John A.; Mahon, Rita; Oh, Eunha; Goetz, Peter G.; Mozersky, Sharon

doi:10.1117/12.465903

Cited by 9 publications

(9 citation statements)

References 5 publications

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“…Currently, the fastest retro-modulators are the 45-Mb/s pixilated modulators developed by Gilbreath et al 6,12 . Those devices use about 100-mW of electrical power when they are operated at 45-Mb/s and they have extinction ratios of 2 to 4 and have been produced in sizes of ~ 1 cm.…”

Section: Amplified Retro-modulator System Operating At 25-gbpsmentioning

confidence: 99%

“…Those experiments were soon followed by the Multiple Quantum Well modulated retro-reflected experiments of Gilbreath et al 5 , who demonstrated Mbps data rates to an unmanned airborne vehicle. Recently, Gilbreath et al 6 demonstrated a retro-modulator that provided 40-Mbps data rates. In this paper, we present the first demonstration of a 2.5-Gbps retro-modulator and the first demonstration of an amplified retromodulator.…”

Section: Introductionmentioning

confidence: 99%

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2.5-Gbps amplified retro-modulator for free-space optical communications

Shay

Kumar

2004

SPIE Proceedings

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The results of experiments demonstrating the first amplified retro-modulated free-space optical communications link are presented. The amplifier increases the effective area of the retro-modulator by a factor of 318. The first experimental demonstration of a retromodulator operating at a data rate of 2.5-Gbps is also presented. We will present the details of the experimental system, a simple theoretical model explaining the system performance, and the results of the first amplified retro-modulated link experiments.

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Section: Amplified Retro-modulator System Operating At 25-gbpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

2.5-Gbps amplified retro-modulator for free-space optical communications

Shay

Kumar

2004

SPIE Proceedings

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“…All these techniques assume isotropic Lambertian scattering [2] and introduce a major intensity loss. A setup that is capable of measuring five DOFs, x; y; z coordinates and two angles (pitch and yaw), was proposed by Gilbreath et al [3]. The setup includes eight different retroreflectors (RRs) placed in precalculated positions to enable the acquisition of the data.…”

Section: Introductionmentioning

confidence: 99%

“…The above publications on DOF measurements [3][4][5][6] tend to focus on optical measurement principles and their corresponding optical designs. An optical design is mainly influenced by axial misalignments, optical element impairment and physical effects, such as dispersion and birefringence.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the estimation accuracy of polarization-based roll angle measurement

2013

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The orientation of remote objects can be easily measured optically and very accurately using optical technologies. In this paper, we address the accuracy of a roll angle estimation technique that is based on the estimation of the polarization of a retroreflected beam and is applied in a long-range measurement task. Over long transmission ranges, the optical power decreases significantly leading to severe SNR deterioration. As a result, the measurement accuracy decreases. In this study, the estimation is carried out using a maximum-likelihood estimator and its performance is evaluated using the analytical Cramer-Rao bound.

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“…The recent development of the Modulation Retro-Reflector (MRR) [1] based on Multiple Quantum Well semiconductor technology shutter allows the reflectivity of corner cube to be varied with bandwidths greater than 1 MHz and extinction ratios greater than 6 dB. This can be used to encode a communications signal on the light reflected from an MRR.…”

Section: Introductionmentioning

confidence: 99%