Low macrobending loss single-mode optical fibre

摘要

A single-mode transmission optical fiber includes a central core region radially outwardly from a centerline to a radius r1 and having a positive relative refractive index Δ1; a first inner cladding region extending radially outwardly from the central core to a radius r2 and having a negative relative refractive index Δ2; a second inner cladding region extending radially outwardly from the first inner cladding region to a radius r3 and having a non-negative relative refractive index Δ3; an intermediate cladding region extending radially outwardly from the second inner cladding region to a radius r4 having a negative relative refractive index Δ4 larger in absolute value than the relative refractive index Δ2; and an outer cladding region extending radially outwardly from the intermediate cladding region and having a non-negative relative refractive index Δ5; wherein the relative refractive index Δ2 of the first inner cladding region is −0.1·10−3 to −1.0·10−3 and the relative refractive index Δ4 of the intermediate cladding is −3.0·10−3 to −5.0·10−3.

主权项

1. A single-mode transmission optical fibre comprising:
a central core region radially outwardly from a centerline to a radius r1 and having a positive relative refractive index Δ1; a first inner cladding region extending radially outwardly from the central core to a radius r2 and having a negative relative refractive index Δ2; a second inner cladding region extending radially outwardly from the first inner cladding region to a radius r3 and having a non-negative relative refractive index Δ3; an intermediate cladding region extending radially outwardly from the second inner cladding region to a radius r4 having a negative relative refractive index Δ4 larger in absolute value than the relative refractive index Δ2; and an outer cladding region extending radially outwardly from the intermediate cladding region and having a non-negative relative refractive index Δ5,wherein the relative refractive index Δ2 of the first inner cladding region is −0.1·10−3 to −1.0·10−3, the relative refractive index Δ3 of the second inner cladding region is 0 to 0.5·10−3, and the relative refractive index Δ4 of the intermediate cladding is −3.0·10−3 to −5.0·10−3, andwherein the radial width of the intermediate cladding region, defined as a difference (r4−r3), is from 8 μm to 22 μm.