  Waveguide arrays offer enormous potential to design circuit elements
essential to fabricate optical devices capable to processing information
codified by light. In this work we study the existence and stability of
localized beams in one dimensional photonic lattices composed by a Kerr type
waveguide array. We analyzed the case where discrete translation symmetry is
broken in as much as one of the waveguides lacks a nonlinear response.
Specifically, we determined the space of parameters where a coherent and robust
mobility across the lattice is achieved. Moreover, we calculate the reflection
and transmission coefficients when localized beams interact directly with the
impurity, finding that it behaves as a variable filter depending of system
parameters. Our results would shed light on develop solutions to keep unaltered
information during its transmission within future optical devices.
