Abstract: A connection node (13) for an optical communication network (10) comprises a plurality of connection units (21). Each of the connection units (21) includes an associated add/drop filter unit (22) having an add filter and a drop filter for adding and dropping signals of specific wavelengths channels to and from light running in two opposite path directions (A, B). The add/drop filter units (22) are arranged along the light paths such that the light in each direction (A, B) first pass through all drop filters and then through al add filters. The connection node may be a multinode comprising a main node (13M) and at least one extension node (13E), each comprising a plurality of west and east connection units (21w, 21e) having associated add/drop filter units (21w, 21e). The add/drop filter units (22) of the main and extension nodes (13M, 13E) are then arranged in an intertwined manner along the light paths.