Single mode optical fiber with low bending losses

The invention claims an optical transmission optical fibre, comprising: The central core, wherein with an optical a refractivity Δ n1; The cladding layer, wherein with an optical a refractivity Δ; n2And the second identifying the cladding layer, which is less than with an optical refractivity rod Δ n3 is 3×10-3. The second identifying the cladding layer further comprises a weight concentration is 0.5% to 7% is germanium. The optical fibre outlet display the speed reducer bent and micro-bending loss, for displaying the standard single-mode optical fibre (SSMF) optical performance.