  Stable discrete compactons in arrays of inter-connected three-line waveguide
arrays are found in linear and nonlinear limits in conservative and in
parity-time PT symmetric models. The compactons result from the interference of
the fields in the two lines of waveguides ensuring that the third (middle) line
caries no energy. PT-symmetric compactons require not only the presence of gain
and losses in the two lines of the waveguides but also complex coupling, i.e.
gain and losses in the coupling between the lines carrying the energy and the
third line with zero field. The obtained compactons can be stable and their
branches can cross the branches of the dissipative solitons. Unusual
bifurcations of branches of solitons from linear compactons are described.
