Patent ID: 8965165
Filing Date: 2015-02-24
Classification: G02B

Abstract:
1. A multicore fiber comprising: a cladding; and a plurality of core elements provided in the cladding, each of the plurality of core elements including a core, an inner cladding layer that surrounds the core, and a low-refractive index layer that surrounds the inner cladding layer and has a lower average refractive index than the cladding and the inner cladding layer, wherein the plurality of core elements is arranged so as to surround a specific core element by three or more core elements, and the plurality of core elements includes a first core element having a first low-refractive index layer and a second core element having a second low-refractive index layer, and the first low-refractive index layer of the first core element has larger light confinement loss in the core than the second low-refractive index layer of the second core element.