of the input field and inhibited B loch oscillations because of symmetry breaking and
power-induced beam spreading. In another experiment, optical Bloch oscillations were
observed by using an array of polymer waveguides in which the linear variation of the
refractive index was realized by applying a temperature gradient [ 100].
The experimentally observed effects induced by the nonlinearity are well repro-
duced in numerical simulations. They can be explained by the nonlinear phase shift that
changes the linear nature of the phase relations and makes the recovery incomplete. As
a result, the field distribution ...
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