Patent ID: 9599769
Date: 2017-03-21
CPC Classifications: C03B,C03C,G02B,Y02P

Claim:
1. A hydrogen-resistant, graded-index optical fiber comprising: a core having a central axis, the core consisting essentially of silica and fluorine, wherein a concentration of fluorine within the core increases as a radial distance from the central axis increases; and a cladding region surrounding the core, the cladding region comprising an inner cladding region (i) comprising silica, fluorine, and at least one of germanium, phosphorus, and titanium, and (ii) having a refractive index lower than a refractive index of the core, wherein a concentration of fluorine and at least one of germanium, phosphorus, and titanium in the inner cladding region varies substantially across the inner cladding region.