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IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)

Bistable optical devices based on non-reciprocal optical amplifier

Wadim Zaets, Koji Ando

Published Jan 20, 2003• 0 citations
Publisher

Abstract

The bistable optical devices are attractive components for systems in which optical signals are processed directly without conversion into electrical signal. The paper discusses the possibilities of using the unique directional properties of the non-reciprocal optical amplifier to enhance the performance of bistable devices. The optical gain/loss in the forward and backward directions for GaAs/sub 1-x/P/sub x//Al/sub 1-x/Ga/sub x/As quantum-well optical amplifier covered by Co is shown.

DOI
10.1109/leos.1999.811966

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The bistable optical devices are attractive components for systems in which optical signals are processed directly without conversion into electrical signal. The paper discusses the possibilities of using the unique directional properties of the non-reciprocal optical amplifier to enhance the performance of bistable devices. The optical gain/loss in the forward and backward directions for GaAs/sub 1-x/P/sub x//Al/sub 1-x/Ga/sub x/As quantum-well optical amplifier covered by Co is shown.
Optical bistability in semiconductor laser amplifiers is particularly interesting because of the gain provided by the device. Small changes, in input power can result in large changes in amplifier gain, and this leads to possible applications in all-optical regenerators for transmission systems. Other possible applications include their use as optical switches and logic elements.1 Optical bistability in GaAs laser amplifiers operating at 850 nm has been reported previously.2 Here we report for the first time measured results at 1.5 μm with an InGaAsP device.
The nonlinear optical properties of many materials and devices have been the main object of research as potential candidates for sensing in different places. Just one of these properties has been, in most of the cases, the basis for the sensing operation. As a consequence, just one parameter can be detected. In this paper, although just one property will be employed too, we will show the possibility to sense different parameters with just one type of sensor. The way adopted in this work is the use of the optical bistability obtained from different photonic structures. Because this optical bistability has a strong dependence on many different parameters the possibility to sense different inputs appears. In our case, we will report the use of some non-linear optical devices, mainly Semiconductor Optical Amplifiers, as sensing elements. Because their outputs depend on many parameters, as the incident light wavelength, polarization, intensity and direction, applied voltage and feedback characteristics, they can be employed to detect, at the same time, different type of signals. This is because the way these different signals affect to the sensor response is very different too and appears under a different set of characteristics.
Abstract For a multi-frequency non-reciprocal optical device, we first realize multi-frequency optical non-reciprocal transmission using a non-Hermitian multi-mode resonator array. Practically, multi-frequency operation can add channels to the non-reciprocal optical device and the non-reciprocity can route optical signals and prevent the reverse flow of noise. Using the Scully–Lamb model and gain saturation effect, we accomplish dual-frequency non-reciprocal transmission by introducing nonlinearity into a linear array of four-mode resonators. The accomplishment is directly demonstrated by the non-reciprocal transmission phenomena present in the non-divergent peaks. For example, a directional cyclic amplifier is constructed with non-reciprocal units. Regarding potential applications, non-reciprocal optical systems can be employed in dual-frequency control, parallel information processing, photonic integrated circuits, optical devices and so on.
Gives a broad description of optical bistability: from practical applications, as an optical transistor or optical memory element, to its phase transition interpretation. The theory is divided into three parts. The first is a simple discussion that covers most of the basic experimental effects and concepts of practical importance. The second part applies to atomic system where a semiclassical as well as a quantum-mechanical approach is possible. The third one discusses the mechanisms compatible with large nonlinearities observed in InSb and GaAs as semiconductors constitute the most promising materials for applications. Current experimental progress in all-optical and hybrid devices is also discussed and scaling example is presented to indicate the possibilities in high-speed all-optical signal processing.