| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-core optical fiber that can realize suppression of crosstalk on an easy and inexpensive basis.SOLUTION: A multi-core optical fiber 1 is provided with a plurality of core portions 11 extending along a fiber axis, a cladding portion 12 surrounding the core portions 11, a coating layer 20 surrounding the cladding portion 12, and a microbend applying portion 31 provided on the outer periphery of the coating layer 20. The microbend applying portion 31 is continuously provided on a partial region of the outer periphery of the coating layer 20 along the fiber longitudinal direction, has a radial thickness d of not less than a predetermined value, and applies a microbend to a glass region 10. |
