LOW-LOSS AND LOW-BEND-LOSS OPTICAL FIBER

摘要

A single-mode fiber with low loss and low bend loss is disclosed. The fiber is single mode and has a central core (10), an inner cladding (20) and an outer cladding (30). The central core (10) has a radius r1 and relative refractive index with a maximum value of Δ1max and a core alpha greater than 1 and less than 10, and a Ge02 dopant concentration of greater than 1 wt.% and less than or equal to 5 wt.%. The inner cladding (20) has an outer radius r2 > 9 micrometers and a relative refractive index Δ2 where Δ2 is less then -0.15%. The outer cladding (30) has a refractive index Δ3, wherein Δ1 >Δ3 >Δ2. The difference Δ3 - Δ2 > 0.005%. The inner cladding includes fluorine having a concentration of greater than or equal to 0.5 wt.% and the outer cladding is updoped with respect to inner cladding.