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Nonlinear Guided Waves and Their Applications

A scheme for high-contrast, low power all-optical gate using spatial solitons

Vsevolod V. Afanasjev, V. N. Serkin

Published Jan 1, 1993• 0 citations
Publisher

Abstract

The optical solitons (temporal and spatial) are very promising for all-optical switching and logic gates due to stability and uniform phase along the pulse. Various schemes have been demonstrated (see, for instance, [1-4]), however in all those schemes the power of the control wave was more or comparable with the power of the signal wave. We propose a scheme where the control wave power is approximately 2-4% of the signal wave power. This scheme is based on the control of the bright spatial soliton interaction.

DOI
10.1364/nlgwp.1993.mc.5

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The optical solitons (temporal and spatial) are very promising for all-optical switching and logic gates due to stability and uniform phase along the pulse. Various schemes have been demonstrated (see, for instance, [1-4]), however in all those schemes the power of the control wave was more or comparable with the power of the signal wave. We propose a scheme where the control wave power is approximately 2-4% of the signal wave power. This scheme is based on the control of the bright spatial soliton interaction.
A novel concept for an all-optical transistor is proposed and verified numerically. This concept relies on cross-phase modulation between a signal and a control pulse. Other than previous approaches, the interaction length is extended by temporally locking control and the signal pulse in an optical event horizon, enabling continuous modification of the central wavelength, energy, and duration of a signal pulse by an up to sevenfold weaker control pulse. Moreover, if the signal pulse is a soliton it may maintain its solitonic properties during the switching process. The proposed all-optical switching concept fulfills all criteria for a useful optical transistor in [Nat. Photon. 4, 3 (2010)], in particular, fan-out and cascadability, which have previously proven as the most difficult to meet.
We show by experiment that scattering of an optical pulse at an optical event horizon provides an unprecedented potential for controlling the properties of a light pulse with another light pulse. Most importantly, with proper parameter selection, a strong pulse can be switched by a 7 times less energetic pulse, which clearly sets our method apart from almost any other previously proposed optical transistor. Moreover, while a gate pulse may experience serious reshaping effects in the normal dispersion regime, a suitably chosen soliton does not dispersively spread or break up into multiple pulses, such that the solitonic switching scheme is cascadable.
We study the interaction between an intense soliton and a weak control pulse in optical media with a zero-nonlinearity wavelength (ZNW). By means of numerical simulations, we show that the soliton’s wavelength and group delay can be modified by a proper choice of parameters of the control pulse, such as its power, frequency, and initial delay. Most remarkably, we demonstrate either the suppression of the soliton’s Raman-Induced Frequency Shift (RIFS) or the enhancement of this effect and explain it by temporal analogies of reflection and transmission. Finally, we propose an all-optical switching scheme based on time and frequency windows.