CROSS REFERENCE TO RELATED APPLICATION

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2019-135482, filed on Jul. 23, 2019, the entire contents of which are incorporated herein by references.

TECHNICAL FIELD

The present disclosure relates to an optical connecting structure for connecting multi-core fibers.

BACKGROUND

JP2013-228548A discloses a multi-core fiber in which a plurality of cores are provided in one optical fiber. JP2013-020227A discloses an optical device in which one multi-core fiber is connected to a plurality of single core fibers. JP2017-187644A and US2014/0093211A disclose a wiring structure for cross-connecting a plurality of optical fibers.

SUMMARY

The present disclosure provides an optical connecting structure for connecting multi-core fibers. The optical connecting structure includes a plurality of first multi-core fibers of which each optical fiber includes a plurality of cores, a plurality of second multi-core fibers of which each optical fiber includes a plurality of cores, a first optical system which allows at least a part of light beams emitted from the cores of each first multi-core fiber to have different propagation directions, and a second optical system which allows each light beam emitted from each first multi-core fiber and propagated through the first optical system to be condensed on the plurality of second multi-core fibers. In the optical connecting structure, a first fiber array where the first multi-core fibers are arrayed corresponds to a first core array where the cores in the respective optical fibers of the first multi-core fibers are arrayed in a first surface intersecting an optical axis of the first optical system, and a second fiber array where the second multi-core fibers are arrayed corresponds to a second core array where the cores in the respective optical fibers of the second multi-core fibers are arrayed in a second surface intersecting an optical axis of the second optical system.

