  We demonstrate the existence of stable collective excitation in the form of
"supersolitons" propagating through chains of solitons with alternating signs
(i.e., Newton's cradles built of solitons) in nonlinear optical couplers,
including the PT-symmetric version thereof. In the regular coupler, stable
supersolitons are created in the cradles composed of both symmetric solitons
and asymmetric ones with alternating polarities. Collisions between moving
supersolitons are investigated too, by the means of direct simulations in both
the regular and PT-symmetric couplers.
