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 1; a first inner cladding region extending radially outwardly from the central core to a radius r2 and having a negative relative refractive index 2; 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 3; an intermediate cladding region extending radially outwardly from the second inner cladding region to a radius r4 having a negative relative refractive index 4 larger in absolute value than the relative refractive index 2; and an outer cladding region extending radially outwardly from the intermediate cladding region and having a non-negative relative refractive index 5; wherein the relative refractive index 2 of the first inner cladding region is 0.1·103 to 1.0·103 and the relative refractive index 4 of the intermediate cladding is 3.0·103 to 5.0·103.