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Quantum Electronics

Characteristics of self-switching of unidirectional distributively coupled waves with orthogonal polarisations

A. A. Maǐer, K. Yu. Sitarskii

Published Feb 28, 1996• 0 citations
Publisher

Abstract

A general solution of the problem of the interaction between unidirectional distributively coupled waves with orthogonal polarisations is found an analysed. Interesting features of optical self-switching of these waves are identified and key formulas describing such switching are derived. It is shown that signal amplification as a result of self-switching may be extremely high and this can happen even when the coupling coefficient is zero. This case of zero coefficient is paradoxically of the greatest practical interest. The results obtained should be useful in working with birefringent waveguides and crystals.

DOI
10.1070/qe1996v026n02abeh000615

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A general solution of the problem of the interaction between unidirectional distributively coupled waves with orthogonal polarisations is found an analysed. Interesting features of optical self-switching of these waves are identified and key formulas describing such switching are derived. It is shown that signal amplification as a result of self-switching may be extremely high and this can happen even when the coupling coefficient is zero. This case of zero coefficient is paradoxically of the greatest practical interest. The results obtained should be useful in working with birefringent waveguides and crystals.
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An analysis is made of nonlinear transmission (self-switching, self-modulation) of light in tunnel-coupled cubically nonlinear waveguides and other optical systems carrying unidirectional waves with a distributed coupling which become separated at the exit from a system if at least one of the waves travels in a medium with a cubic (Kerr) susceptibility. Optical transistors and bistable devices based on these systems are considered. The threshold energy of bistable devices based on coupled GaAs waveguides is ~10−10–10−9 J.
We present a model calculation of optical bistability and polarisation evolution in optically birefringent media based on the interaction of three waves.Second-order optical nonlinearity (described by the third rank susceptibility tensor) is assumed to be dominant.A bistable light transmission is analysed in terms of standard Fabry-Perot model of feedback, and is a direct consequence of the results obtained for a semi-infinite medium.A second effect considered in the paper is evolution of polarisation state of the waves involved in these processes.We derived a closed formula for intensity-dependent refractive index, which corresponds to that used in the case of third-order nonlinear media.As a result, we calculated both intensity • and Stokes parameters of transmitted light.
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