Optical Bistability Switching Research Articles

Bistable optical switching based on bragg diffraction

The operation characteristics of an acousto-optics nonlinear device are presented where the diffracted light is used to create a feedback leading to hysteresis and bistability. Possible application as an optically controlled two-channel switch with a response time smaller than 1 μs is given.

Analytical description of anomalous switching in dispersive optical bistability

We give analytical description of anomalous switching in dispersive optical bistability, and determine approximately its threshold indicent field as a function of the parameters of the system.

Complementary optical bistable switching and triode operation using LiNbO<inf>3</inf>directional coupler

Optical bistable switching and optical triode operation have been carried out using an optical directional coupler switch fabricated by Ti diffusion into LiNbO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> at the 1.15 μm wavelength. The on/off ratio in conventional bistable switching was 10 dB and that in complementary bistable switching was 13 dB. Amplification gain in triode operation controlled by laser diode was 4.8 dB. Complementary operation was found to reduce feedback gain and to improve the on/off ratio in optical bistable switching.

Switching in Optical Bistability by the Anharmonic Oscillator Model

The response of a bistable optical system to a time-dependent driving field is studied in terms of a quartic anharmonic oscillator describing a non-linear medium. Dynamical lowering of the switching threshold is observed. The dispersive character of the model is confirmed.

Anomalous switching in dispersive optical bistability

The response of a dispersive bistable optical device to an instantaneous change in the driving field is studied theoretically. The device is shown to respond in ways that are significantly different from absorptive bistability. Threshold for switching between stable states do not occur at the same values as in the quasi-steady-state. Instead, anomalous thresholds are predicted. It is suggested that this anomalous switching behaviour may place limitations on the possible device applications. It also implies that dispersive bistable devices may be switched merely by an appropriate change of the phase of the driving field.

Transient response of bistable optical switches

Transient response of bistable optical switches

Multimode integrated optical bistable switch

A multimode integrated optical bistable switch using a LiNbO(3) phase modulator in a noncavity configuration was constructed and tested. Bistability and discriminator operation were observed in this device using a He-Ne laser.

Electrooptic properties of transparent ferroelectric glass—Ceramic systems

The electrooptic and ferroelectric properties of glass-ceramic systems containing Na <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</inf> K <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</inf> NbO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> and BaTiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> as the crystalline phases are presented. Domain activity is observed by dielectric and optical hysteresis measurements, although it becomes significant only at the larger crystallite size. Thus, the samples transmit light to only a small extent. Bistable optical switching has been achieved with 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sup> V/cm, 100-µs duration pulses. The ratio of transmission measured between crossed polarizers is 2:1.