Multi-core fiber connector

A multi-core fiber connector, comprising:

• a planar waveguide having M×N number of cores and to which M number of fibers on an input side having N number of cores are connected,
• wherein, in a connecting end surface on an output side of the planar waveguide, P number of fibers on the output side having Q number of cores are connected,
• M×N is equal to P×Q,
• the planar waveguide includes a plurality of the cores arranged in a horizontal direction at the same height position in the planar waveguide, and a laminated structure having the cores at different positions in a height direction, so as to be aligned with the cores of the fibers on the output side connected to the connecting end surface on the output side of the planar waveguide,
• the positions of the M×N number of cores are constant in the height direction, and change only in the horizontal direction,
• M is an integer equal to or greater than 1, and N is an integer equal to or greater than 2,
• Q is an integer equal to or greater than 1, and P is an integer equal to or greater than 1,
• there are k types of height positions of the cores in the planar waveguide, wherein k is 4,
• M number of fibers on the input side with 8 cores arranged in an annular shape are connected to the connecting end surface on the input side,
• 2×M number of fibers on the output side with 4 cores arranged in a square lattice shape are connected to the connecting end surface on the output side, and
• the interval between the cores of the fibers on the input side is the square root of 2 times the interval between the cores of the fibers on the output side.

A multi-core fiber connector, comprising:

• a planar waveguide having M×N number of cores and to which M number of fibers on an input side having N number of cores are connected,
• wherein, in a connecting end surface on an output side of the planar waveguide, P number of fibers on the output side having Q number of cores are connected,
• M×N is equal to P×Q,
• the planar waveguide includes a plurality of the cores arranged in a horizontal direction at the same height position in the planar waveguide, and a laminated structure having the cores at different positions in a height direction, so as to be aligned with the cores of the fibers on the output side connected to the connecting end surface on the output side of the planar waveguide,
• the positions of the M×N number of cores are constant in the height direction, and change only in the horizontal direction,
• M is an integer equal to or greater than 1, and N is an integer equal to or greater than 2,
• Q is an integer equal to or greater than 1, and P is an integer equal to or greater than 1,
• there are k types of height positions of the cores in the planar waveguide, wherein k is 4,
• M is 1 and P is 2,
• a first and a second planar waveguides are connected together so as to form an angle of 90 degrees,
• four cores connected to cores at height positions of a second layer and a third layer in the first planar waveguide is bent in the horizontal direction so as to be aligned with cores of one 4-core fiber connected to the connecting end surface on the output side,
• four cores of the first planar waveguide at height positions of a first layer and a fourth layer are joined with four waveguides of the second planar waveguide so as to be aligned with each other, and
• the four cores of the first layer and the fourth layer of the first planar waveguide are bent in the height direction in the second planar waveguide so as to be aligned with cores of a 4-core fiber on the output side connected to the connecting end surface on the output side.