The hole assist type holly fiber and it bends low, the loss multiple mode holly fiber

摘要

It is low, the high performance which it bends and cutoff wave length _C can be compatible with loss L _B shortly the offer of HAHF. The core section whose refractive index is higher than the clad section (11) with, the clad section around that (12) with, surrounding the core section, having with the plural holes which are provided in the clad section, it can provide the hole in internal 2 layer in the hole assist type holly fiber which becomes, the number of holes of the inside hole layer and outer part hole layer is the same, the hole which the outer part hole (17) the inside hole (16) is arranged in the position where it is not arranged considered as the core section center, at the same time forms the respective hole layer to be the same diameter, from the core section center to the inside hole centerThe hole assist type holly fiber which features that distance distance to the outer part hole center₂, ₁ 2 is from_1, and the core section center at the same time the inside hole diameter d₁ and outer part hole diameter d₂, is d₁ d2.