An optical interconnection assembly for the mutual connection of a plurality of signal switching circuit boards that may be coupled to a common planar support, backplane, characterized in that it includes: - first connectors arranged to face corresponding signal transmission ports of said boards, and second connectors arranged to face corresponding signal reception ports of said boards; - a planar support frame, adapted to receive an ordered arrangement of connectors (50a, 50b), which includes a series of said first connectors, and a series of said second connectors, - an interconnection circuit housed by the support frame and deployed between corresponding pairs of first and second connectors (50a; 50b) according to a preset interconnection scheme, wherein said interconnection circuit comprises a plurality of arrangements of aggregated interconnection optical fibers (R1-R8) including planar arrangements of fibers in the form of ribbon cables extending along a longitudinal axis of the arrangement; and - controlled deformation guide means (40, 62, 86) of said plurality of optical fiber arrangements (R1-R8), arranged to establish a corresponding plurality of non-intersecting coplanar paths of said optical fiber arrangements (R1-R8) between corresponding pairs of first and second connectors (50a; 50b), characterised in that each connector (50a; 50b) comprises a connector case (52a, 52b) adapted to house an end portion of the corresponding optical fiber arrangement, which has, at an output section facing said signal switching circuit boards, a fiber termination element adapted to be arranged, in an assembling condition of the connector on the frame, with the longitudinal axis of the optical fiber arrangement orthogonal to the plane (Π) of the frame, and, at an input section facing said planar support frame, an opening for the passage and holding of said optical fiber arrangement, said opening extending orthogonal to the plane (Π) of the frame, and wherein said controlled deformation guide means comprise formations of said connector case adapted to determine a torsion of the relative planar optical fiber arrangement about its own longitudinal axis and a curvature of said planar optical fiber arrangement around an axis transverse to said longitudinal axis, so as to bring said optical fiber arrangement orthogonal to the plane (Π) of the frame. - first connectors arranged to face corresponding signal transmission ports of said boards, and second connectors arranged to face corresponding signal reception ports of said boards; - a planar support frame, adapted to receive an ordered arrangement of connectors (50a, 50b), which includes a series of said first connectors, and a series of said second connectors, - an interconnection circuit housed by the support frame and deployed between corresponding pairs of first and second connectors (50a; 50b) according to a preset interconnection scheme, wherein said interconnection circuit comprises a plurality of arrangements of aggregated interconnection optical fibers (R1-R8) including planar arrangements of fibers in the form of ribbon cables extending along a longitudinal axis of the arrangement; and - controlled deformation guide means (40, 62, 86) of said plurality of optical fiber arrangements (R1-R8), arranged to establish a corresponding plurality of non-intersecting coplanar paths of said optical fiber arrangements (R1-R8) between corresponding pairs of first and second connectors (50a; 50b), characterised in that each connector (50a; 50b) comprises a connector case (52a, 52b) adapted to house an end portion of the corresponding optical fiber arrangement, which has, at an output section facing said signal switching circuit boards, a fiber termination element adapted to be arranged, in an assembling condition of the connector on the frame, with the longitudinal axis of the optical fiber arrangement orthogonal to the plane (Π) of the frame, and, at an input section facing said planar support frame, an opening for the passage and holding of said optical fiber arrangement, said opening extending orthogonal to the plane (Π) of the frame, and wherein said controlled deformation guide means comprise formations of said connector case adapted to determine a torsion of the relative planar optical fiber arrangement about its own longitudinal axis and a curvature of said planar optical fiber arrangement around an axis transverse to said longitudinal axis, so as to bring said optical fiber arrangement orthogonal to the plane (Π) of the frame.