Optical coupler for a multicore fiber
An optical coupler is used to optically couple a multicore fiber with multiple optical cores to multiple individual fibers and contains a support in which the multicore fiber is embedded, the cores exiting at a polished end surface. The cores are assembled into groups along lines, and each group is oriented along a line. Waveguides of multiple planar support elements, the waveguides being introduced into the surface of the support elements, are connected to the end surface, each group of cores being coupled into a support element. In this manner, the multicore fiber can be coupled to individual fibers using planar waveguide technology.
1. An optical coupler for optically coupling a multicore fiber having a plurality of optical cores to a plurality of individual fibers, the optical coupler comprising:
a support in which the multicore fiber is embedded in a defined alignment and a first group of the optical cores is oriented along a first line and a second group of the optical cores is oriented along a second line, said support having an end face;
support elements including a planar first support element to which a first group of the individual fibers can be connected and a second planar support element to which a second group of the individual fibers can be connected, each of said support elements having surfaces; and
waveguides inserted into said surfaces of said support elements, a respective one of said support elements is directly attached, by a connection side, to said end face of said support, such that the optical cores of the first group of the multicore fiber are in alignment with said waveguides of said planar first support element, and the optical cores of the second group are in alignment with said waveguides of said planar second support element, and the first and second lines of the first and second groups of the optical cores and, corresponding thereto, said surfaces of said support elements, are disposed at an angle in relation to each other.
2. The optical coupler according to claim 1 , wherein said surfaces of said support elements are disposed at a right angle in relationship to each other.
3. The optical coupler according to claim 1 , wherein said support is of a planar design, having a rectangular cross-sectional face, and the first and second lines are parallel to a side of said support.
4. The optical coupler according to claim 1 , wherein said support elements further include a planar third support element, wherein the multicore fiber has at least one third group of optical cores, which are oriented along at least one third line, and which can be connected to a third group of the individual fibers via said planar third support element.
5. The optical coupler according to claim 4 , wherein the first, second and third lines are oriented perpendicularly in relation to each other.
6. The optical coupler according to claim 1 , wherein in said planar second support element, at least one of said waveguides is disposed in a corner region, and an edge distance of said one waveguide from a lateral face of said planar second support element is less than or equal to a core distance of the first line from a nearest optical core of the second line.
7. The optical coupler according to claim 1 , wherein said connection side and said end face are beveled so as to correspond to each other.
8. The optical coupler according to claim 1 , wherein said end face is polished.
9. The optical coupler according to claim 1 , wherein said waveguides of said support elements diverge from said connection side to an opposite coupling side, such that a distance dimension of the optical cores in the multicore fiber is increased to a grid dimension.
10. The optical coupler according to claim 1 , further comprising connection supports, the first and second groups of the individual fibers are embedded in a respective one of said connection supports that is connected to a respective one of said support elements.
11. The optical coupler according to claim 1 , further comprising an optical connector disposed at an end of the individual fibers.