Patent ID: 9128234
Filing Date: 2015-09-08
Classification: G02B,H04B,H04J

Abstract:
1. A multi-core optical fiber comprising: a plurality of core portions; and a cladding portion positioned at outer peripheries of the plurality of core portions, the cladding portion having a refractive index lower than a maximum refractive index of each of the core portions, wherein each of the core portions propagates light only with predetermined number, which is equal to or greater than 2, of propagation modes, an effective core area at wavelength of 1550 nm of each of the propagation modes is equal to or greater than 120 μm the core portion comprises of a center core portion having the maximum refractive index, and an outer periphery core portion formed at an outer periphery of the center core portion and having refractive index which is lower than the refractive index of the cladding portion, and a relative refractive index difference Δ