OPTICAL ROTARY JOINT

摘要

Disclosed is an optical rotary joint with which transmission loss does not change significantly during rotation of fibers. Specifically disclosed is an optical rotary joint that holds a first optical fiber (11) and a second optical fiber (21) such that the optical fibers can rotate about the axes (19, 29), respectively, relative to each other. The first optical fiber (11) and the second optical fiber (21) are partially or entirely formed of multicore optical fibers including a plurality of cores, and the plurality of cores are disposed in a cicular or annular area sectioned by concentric circles having centers at the axes (19, 29) of the multicore optical fibers.