BENDING INSENSITIVE SINGLE-MODE OPTICAL FIBER

摘要

In one aspect of the invention, the bend insensitive single-mode optical fiber includes a core layer and cladding layers having an inner cladding layer, a trench cladding layer and an outer cladding layer sequentially formed surrounding the core layer from inside to outside. For the core layer, the diameter is 7-7.9 μm, and the relative refractive index difference Δ1 is between 4.6×10−3 and 6.0×10−3. For the inner cladding layer, the diameter is 15-17 μm, and a relative refractive index difference Δ2 is between −3×10−4 and 3×10−4. For the trench cladding layer, the diameter is 24-33 μm, and the relative refractive index difference Δ3 is between −2.9×10−3 and −7.3×10−3, changes in a gradient manner and increases gradually from outside to inside, where a relative refractive index difference Δ32 at an outermost interface is smaller than a relative refractive index difference Δ31 at an innermost interface.

主权项

1. A bend insensitive single-mode optical fiber, comprising:
a core layer; and cladding layers surrounding the core layer, wherein a diameter, a, of the core layer is between 7 μm and 7.9 μm, and a relative refractive index difference Δ1 of the core layer is between 4.6×10−3 and 6.0×10−3; and wherein the cladding layers surrounding the core layer comprises an inner cladding layer surrounding the core layer, a trench cladding layer surrounding the inner cladding layer and an outer cladding layer surrounding the trench cladding layer; wherein a diameter, b, of the inner cladding layer is between 15 μm and 17 μm, and a relative refractive index difference Δ2 of the inner cladding layer is between −3×10−4 and 3×10−4; and wherein a diameter, c, of the trench cladding layer is between 24 μm and 33 μm, and a relative refractive index difference Δ3 of the trench cladding layer is between −2.9×10−3 and −7.3×10−3, wherein the relative refractive index difference Δ3 changes in a gradient manner and increases gradually from outside to inside of the trench cladding layer, and wherein a relative refractive index difference Δ32 at an outermost interface between the trench cladding layer and the outer cladding layer is smaller than a relative refractive index difference Δ31 at an innermost interface between the trench cladding layer and the inner cladding layer.