MULTI-CORE FIBER

摘要

A multi-core fiber includes an even number of six or more of cores and a clad that surrounds the outer circumferential surfaces of the cores. The cores are formed of two types of cores and in which an effective refractive index difference in a fundamental mode is 0.002 or less in a predetermined range or more that the effective refractive index difference in the fundamental mode is varied according to a core pitch. Two types of the cores are alternately and annularly disposed at regular spacings. A difference in the mode field diameter of light propagating through the cores is 1 μm or less.

主权项

1. A multi-core fiber comprising:
an even number of six or more of cores; and a clad surrounding outer circumferential surfaces of the cores, wherein: the even number of cores are formed of two types of cores between which an effective refractive index difference in a fundamental mode is different; in the cores, the two types of cores are alternately disposed at regular spacings, and the cores are annularly disposed at an interior angle formed of lines connecting centers of the cores adjacent to each other, the interior angle being greater than an angle of 90°; a difference in a mode field diameter of light propagating through the cores is 1 μm or less; and an expression is satisfied:
1.450×10−5×D≦neff≦0.002wherein an inter-center pitch between the cores adjacent to each other is D μm and an effective refractive index difference between the cores adjacent to each other is Δneff.