A numerical analysis and expository interpretation of the diffraction of light by ultrasonic waves in the Bragg and Raman-Nath regimes using multiple scattering theory

Chen, Shih-Tun; Chatterjee, Monish Ranjan

doi:10.1109/13.485233

Cited by 26 publications

(2 citation statements)

References 17 publications

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“…Some well-known processes involve digital and alternative modes of postprocessing whereby the distorted information is restored to some degree via use of corrective filters and different processing strategies; [11][12][13] our approach, however, involves preprocessing whereby the distortion of the signal or information is mitigated pre-emptively before the signal suffers any significant degradation. To this end, it was speculated earlier 7 that the inherent immutability and robustness of signals securely transmitted via encrypted chaotic modulation may consequently provide some immunity to the propagation and recovery of a signal transmitted over turbulence as well.…”

Section: Acousto-optic (A-o) Chaos and Chaosmentioning

confidence: 99%

Image intensity recovery with mitigation in the presence of gamma–gamma atmospheric turbulence using encrypted chaos

Mohamed

Chatterjee

2019

Opt. Eng.

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Mitigation of image distortion under modified von Karman-type phase turbulence has been examined by using acousto-optic (A-O) chaos waves generated via feedback in a Bragg cell. The chaos wave transferred to the optical carrier either over an image-bearing transparency (with the image reconstructed with appropriate lensing), or alternatively the two-dimensional image (both static as well as dynamic) is embedded in the chaos wave and propagated over the turbulent layer. These investigations demonstrate that the properties of chaos waves including relative immunity from variations in the propagation path enable reduction or mitigation of the image distortion under turbulent conditions. Mitigation of image distortion is explored using propagation through a turbulent atmospheric layer characterized by gamma-gamma type intensity fluctuations. Standard weak, moderate, and strong turbulence conditions are applied for the numerical analysis based on the corresponding structure parameters. Following standard approach, the relevant probability density functions are generated using small-and large-scale eddies (α and β numbers) incorporated into the turbulence model. In addition, mitigation of image distortion due to gamma-gamma turbulence is examined for propagation along a low-altitude slanted path with a fixed slope and different elevation angles using A-O chaos along with the Huffnagel-Valley model. Stationary images are transmitted under nonchaotic and chaotic conditions, and the corresponding distortions in the received images are measured using the conventional metric of bit error rates. The system performances under nonchaotic and chaotic transmissions are compared with the intent to establish that packaging a signal within a chaos wave offers a degree of distortion mitigation.

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Section: Acousto-optic (A-o) Chaos and Chaosmentioning

confidence: 99%

Image intensity recovery with mitigation in the presence of gamma–gamma atmospheric turbulence using encrypted chaos

Mohamed

Chatterjee

2019

Opt. Eng.

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“…1 This mode is utilized for signal processing applications such as laser beam deflection, modulation, and filtering. A piezoelectric oscillator creates acoustic vibrations in a crystal which acts as a diffraction grating and causes the deflection of a light beam passing through the crystal.…”

Section: Introductionmentioning

confidence: 99%

Improved performance of analog and digital acousto-optic modulation with feedback under profiled beam propagation for secure communication using chaos

Almehmadi

Chatterjee

2014

Opt. Eng

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Using intensity feedback, the closed-loop behavior of an acousto-optic hybrid device under profiled beam propagation has been recently shown to exhibit wider chaotic bands potentially leading to an increase in both the dynamic range and sensitivity to key parameters that characterize the encryption. In this work, a detailed examination is carried out vis-à-vis the robustness of the encryption/decryption process relative to parameter mismatch for both analog and pulse code modulation signals, and bit error rate (BER) curves are used to examine the impact of additive white noise. The simulations with profiled input beams are shown to produce a stronger encryption key (i.e., much lower parametric tolerance thresholds) relative to simulations with uniform plane wave input beams. In each case, it is shown that the tolerance for key parameters drops by factors ranging from 10 to 20 times below those for uniform plane wave propagation. Results are shown to be at consistently lower tolerances for secure transmission of analog and digital signals using parameter tolerance measures, as well as BER performance measures for digital signals. These results hold out the promise for considerably greater information transmission security for such a system. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 126102-2 December 2014 • Vol. 53(12) Almehmadi and Chatterjee: Improved performance of analog and digital acousto-optic modulation. . . Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms

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Mathematical Methods

2011

Plasma Scattering of Electromagnetic Radiation

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A numerical analysis and expository interpretation of the diffraction of light by ultrasonic waves in the Bragg and Raman-Nath regimes using multiple scattering theory

Cited by 26 publications

References 17 publications

Image intensity recovery with mitigation in the presence of gamma–gamma atmospheric turbulence using encrypted chaos

Image intensity recovery with mitigation in the presence of gamma–gamma atmospheric turbulence using encrypted chaos

Improved performance of analog and digital acousto-optic modulation with feedback under profiled beam propagation for secure communication using chaos

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