Bistable optical switching based on bragg diffraction

Chrostowski, J.; Delisle, Claude

doi:10.1016/0030-4018(82)90319-4

Cited by 56 publications

(15 citation statements)

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“…(3) that leads to mono-, bi-, and multistable behavior, followed by chaos in its various manifestations. 3 Several research groups have also investigated aspects and applications of acousto-optic bistability in the past 10 years or more. [5][6][7] Recently, Ghosh and Verma have conducted an analytical examination of the conditions for the onset of chaos in the A-O feedback system using the Lyapunov exponent.…”

Section: Nonlinear Feedback System and Chaosmentioning

confidence: 99%

“…6 It was shown that optical bistability, possible multistability, and chaos may be generated for three fundamental types of tuning effects, i.e., feedback gain, bias voltage, and input amplitude, thereby verifying earlier work. [2][3][4] In the simulation, E inc is set to 1 for convenience. To study the bistable and chaotic behavior of the hybrid device, typically the input bias is increased from 0 to a maximum and subsequently decreased monotonically back to 0.…”

Section: Hybrid A-o Device and Its Chaotic Dynamicsmentioning

confidence: 99%

“…A plot of the first order intensity (I 1 ) versus the bias inputα 0 yields the well known bistable and hysteretic behavior. 3,4 The bistability and hysteresis characteristics depend strongly on the feedback gain (β), the feedback time delay (TD), and the amplitude (I inc ) of the incident 0091-3286/2011/$25.00 C 2011 SPIE light. In this paper, we specifically focus on the behavior of the diffracted first-order light under feedback, operating in the chaotic regime, with or without (RF) signal modulation.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback

Chatterjee

Alsaedi

2011

Opt. Eng

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Generation of chaos from acousto-optic (A-O)Bragg cell modulators with an electronic feedback has been studied for over 3 decades. Since an acousto-optic Bragg cell with zeroth-and first-order feedback exhibits chaotic behavior past the threshold for bistability, such a system was recently examined for possible chaotic encryption of simple messages (such as a low-amplitude sinusoidal signal) applied via the bias input of the sound cell driver. Subsequent recovery of the message signal was carried out via a heterodyne-type strategy employing a locally generated chaotic carrier, with threshold parameters matched to the transmitting Bragg cell. In this paper, we present numerical results and detailed interpretations for signal encryption and recovery under hybrid A-O electronic feedback using a heterodyne strategy. Important features of this setup, such as the system robustness in terms of parameter matching (feedback gain, dc bias, and time delay) are also examined in some detail. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). IntroductionIn an acousto-optic (A-O) modulator, an RF signal applied to a piezo-electric transducer, bonded to a suitable crystal, will generate an acoustic wave. It is well known that the acoustic wave acts like a "phase grating" that diffracts any incident laser beam into a number of diffracted orders. The Raman-Nath regime is characterized by multiple scattered orders while in the Bragg regime there are typically only two scattered orders (zeroth-and first-orders). 1 Around 1978, it was reported that A-O devices with positive feedback gain exhibit bistability characteristics. 2 In an A-O device, the amplitude of the diffracted fields that operate in the Bragg regime, i.e., the zeroth-and first-orders, which appear at the output of the Bragg cell, are related through a set of coupled differential equations. In Refs. 3 and 4, Chrostowski and co-workers present experimental results for A-O bistability and chaos using an equivalent circuit model of the Bragg cell with feedback. In a standard setup, a Bragg cell is driven by an ultrasonic sound wave from an RF generator at 40 MHz, and the resulting sound grating diffracts an incident He-Ne laser beam into the first Bragg order under Bragg condition. The first-order is then picked up by a linear photodetector, fed to an amplifier, and then returned to the bias input of the RF generator. The arrangement is shown in Fig. 1. Nominally, the scattered light beam is intrinsically frequency or phase modulated (with the acoustic frequency). In typical waveform sources, the external bias input amplitude modulates the RF waveform. A plot of the first order intensity (I 1 ) versus the bias inputα 0 yields the well known bistable and hysteretic behavior. 3,4 The bistability and hysteresis characteristics depend strongly on the feedback gain (β), the feedback time delay (TD), and the amplitude (I inc ) of the incident

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Section: Nonlinear Feedback System and Chaosmentioning

confidence: 99%

Section: Hybrid A-o Device and Its Chaotic Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Examination of chaotic signal encryption and recovery for secure communication using hybrid acousto-optic feedback

Chatterjee

Alsaedi

2011

Opt. Eng

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“…Note that as Q a, i.e., in the pure Bragg regime, Eq. (4) (6) are the well-known expressions for the scattered light in Bragg diffraction. Therefore, the nonlinearity involving two diffracted orders is a sine squared function.…”

Section: Introductionmentioning

confidence: 99%

Performance of a hybrid bistable device using an acoustooptic modulator

Poon

Cheung

1989

Appl. Opt.

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Previous studies on acoustooptic hybrid bistable devices have been limited to the Bragg regime involving two diffracted orders, and no comparisons have been made between experimental results and theoretical predictions. In this paper, a model including both acoustooptic diffraction and a nonlinear feedback path is investigated. The Klein-Cook parameter Q has been brought into the investigation in that theoretical simulation results based on diffraction involving four diffracted orders are obtained. Experimental results are then presented and compared to theoretical predictions.

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