Patent ID: 7346258
Filing Date: 2008-03-18
Classification: C03B,C03C,G02B,H01S

Abstract:
1. An optical fiber, comprising: a core comprising silica glass containing a first concentration of germanium; an inner cladding arranged on the core, the inner cladding comprising silica glass containing a second concentration of germanium and having a first diffusion coefficient of germanium; and an outer cladding arranged on the inner cladding, the outer cladding comprising silica glass having a second diffusion coefficient of germanium, wherein the first diffusion coefficient of germanium is larger than the second diffusion coefficient of germanium, wherein the first concentration of germanium is about 200% or more of the second concentration of germanium, and wherein a concentration of the germanium is between 3.0 and 21.0% by weight and a concentration of the fluorine is between 0.1 and 1.0% by weight in the core.