| 摘要 |
PROBLEM TO BE SOLVED: To provide multi-core fiber in which crosstalk is less likely to occur even when the distance between adjacent cores is short, which can achieve higher density of a core as compared with conventional fiber, and can contribute to capacity increase and multiplexing of an optical transmission line.SOLUTION: Each of graded index multi-core fiber 10, 20 includes multiple cores 12a, 12b in a clad 11, and the multiple cores 12a, 12b are arranged in one or more folds of even-numbered angle shapes or rectangular grating shapes, in a cross-sectional view. Phase constant intervals of a first core 12a and a second core 12b being adjacent are made to be identical, and a phase constant of the second core 12b is positioned at the center of the phase constant interval of the first core 12a. |
