Patent ID: 9658395
Date: 2017-05-23
CPC Classifications: C03B,C03C,G02B,Y02P

Claim:
1. An optical fiber comprising a chlorine-doped silica core region; a fluorine-doped cladding region; and a fluorine-doped annular stress-accommodation region disposed between the core region and the cladding region, the fluorine-doped annular stress-accommodation region including a concentration of a fluorine dopant of an amount such that the stress-accommodation region has a viscosity substantially the same as the core region, the cladding region having a fluorine dopant concentration greater than the fluorine dopant concentration of the annular stress accommodation region for providing confinement of the propagating optical signal to the combination of the core region and the annular stress-accommodation region wherein the fluorine dopant concentration in the annular stress-accommodation region is between 0.3 mol % and 3.0 mol %.