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1 Opto-Electronics Review

1 2005

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Wide beam stabilities and instabilities in one dimensional arrays of Kerr-nonlinear channel waveguides

Meier J., Christodoulides D. N., Stegeman G. I., Yang H., Salamo G., Morandotti R., Aitchison J. S., Silberberg Y.

Opto-Electronics Review

2005

Vol. 13, No. 2

75-84

The propagation of wide (plane-wave like) and narrow high intensity beams at 1550 nm was investigated in 1D arrays of AlGaAs channel waveguides which are nearest-neighbour coupled via evanescent fields. Spatial diffraction (beam spreading) by evanescent field coupling leads to dispersion relations that are periodic with propagation direction and hence exhibit regions of both normal and anomalous diffraction. This results in propagation directions in which filamentation of high intensity beams with superimposed noise occurs, and other regions in which these beams are stable against noise. Both cases were observed experimentally, and the modulation instability gain was measured versus the spatial frequency of the noise. Good agreement with theory was found.