Patent ID: 8428411
Filing Date: 2013-04-23
Classification: G02B

Abstract:
1. A single-mode optical fiber, comprising: a central core surrounded by an outer cladding, said central core having (i) a radius r an intermediate cladding positioned between said central core and said outer cladding, said intermediate cladding having a radius r a buried trench positioned between said intermediate cladding and said outer cladding, said buried trench having a radius r wherein the optical fiber has (i), at a wavelength of 1310 nanometers, a mode field diameter with a nominal value of between 8.6 microns and 9.5 microns and a tolerance of ±0.4 micron, (ii) a cable cut-off wavelength of 1260 nanometers or less, and (iii), for a bending radius of 15 millimeters at a wavelength of 1550 nanometers, bending losses of 0.003 dB/turn or less.