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All-optical phase-independent logic elements based on phase shift induced by coherent soliton collisions

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3 Author(s)
Kolokoltsev, Oleg V. ; Centro de Instrumentos, Univ. Nacional Autonoma de Mexico, Mexico City, Mexico ; Salas, R. ; Vountesmeri, V.

We demonstrate, for the first time to our knowledge, that a fast coherent collision between two Kerr spatial solitons can give rise to a significant phase shift for both interacting beams. The maximal collision-induced phase shift ≈π rad takes place when the amplitudes of the solitons are equal (η12) and the length of the interaction zone is comparable with a soliton phase period. Depending on the ratio η21, and the collision angle between the solitons, the magnitude of the phase shift can be varied within a reasonable range, for example from 180° to 40°. The analysis of the effect performed by the finite-difference beam-propagation method has shown that it is insensitive to the initial phase difference between the incident beams (δi), even in the case when η 1≠η2. It has been demonstrated that the phenomenon can be used for all-optical three-soliton logic elements, which are capable of providing more than 3-dB signal amplification and possess bi -independent output characteristics

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Lightwave Technology, Journal of  (Volume:20 ,  Issue: 6 )