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Physical Review A

Evanescently induced optical switching between bistable soliton states of the second kind

Sandra Eix, Richard H. Enns, S. S. Rangnekar

Published Apr 1, 1994• 2 citations
Publisher

Abstract

Optical switching between bistable soliton states of the second kind is demonstrated numerically when two parallel, straight optical fibers are evanescently coupled. The numerical switching study is supplemented by a variational analysis which provides a preliminary guide to what ranges of input parameters should be chosen for the switching simulations.

DOI
10.1103/physreva.49.3037

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Optical switching between bistable soliton states of the second kind is demonstrated numerically when two parallel, straight optical fibers are evanescently coupled. The numerical switching study is supplemented by a variational analysis which provides a preliminary guide to what ranges of input parameters should be chosen for the switching simulations.
Light propagation in a 2-D array of coupled optical cavities with Kerr nonlinearity driven by a plane holding beam is numerically studied. Optical bistability together with its modulational instability (MI) are investigated, and 2-D discrete cavity solitons are simulated. These simulations revealed the switching on/off of the solitons along with the ability of a proper Gaussian beam (GB) to control their positions. Soliton-soliton and soliton-GB interactions are considered, and finally, all-optical NOR , XNOR, and NAND gates are proposed as realized by this device.
Applied Physics![Figure][1] CREDIT: [ISTOCKPHOTO.COM][2] The backbone of high-speed communications consists of optic fibers that carry information as pulses of light. Light-sensitive bistable optical resonators coupled to the fibers are capable of controlling the transmitted light, allowing access to the higher information transfer rates offered by all-optical switching. However, the relatively high amount of energy (or light intensity) required to switch an optical resonator between its two states (transmission ON, transmission OFF) can be a limiting factor with regard to power requirements. Sandhu et al. use numerical simulations to show that coherent control, or pulse shaping, of the switching light pulses can reduce the input energy requirements for switching the optical resonator. Moreover, because the peak energy input to the resonator is dependent on the phase of the input pulse, switching by phase modulation should be possible, thus offering the potential for even higher bit rates than attainable with intensity modulation–based protocols. Appl. Phys. Lett. 96 , 231108 (2010). [1]: pending:yes [2]: http://ISTOCKPHOTO.COM
Recently, we predicted1) that partial sample switching can occur in a system showing resonatorless optical bistability due to induced absorption. For an increasing intensity of the incident light, a stepwise propagation of the kink in the excitation profile takes place. In the meantime, the corresponding modulation of the transmitted light has been observed in sharp-cut color filters2). Here, we present an in-depth study of the structure, formation and motion of the kinks. We supplement and expand our original numerical investigations1) by detailed analytical studies. We show that the kink profile may be approximated by a soliton structure if the diffusion of the excitation density is taken into account. Furthermore, we present some simple estimates for the kink propagation.