High-bandwidth, radiation-resistant multimode optical fiber

摘要

A multimode optical fiber includes a central core and an outer cladding (e.g., an outer optical cladding). Typically, the optical fiber's central core is a depressed, central core having an alpha-index profile (i.e., a graded-index profile), an outer radius r1, and a maximum refractive index difference Δn1 with respect to the outer cladding. The central core's alpha-index profile has a minimum refractive index at the central core's outer radius r1 that corresponds to a refractive index difference Δnend with respect to the outer cladding. Exemplary optical-fiber embodiments may include an inner cladding having an outer radius r2 and a width w2. Exemplary optical-fiber embodiments may include a buried trench having a width w3 and an outer radius r3. Furthermore, exemplary optical-fiber embodiments may include an intermediate cladding having an outer radius r4 and a width w4.

主权项

1. A multimode optical fiber, comprising:
a central core surrounded by an outer cladding, said central core having (i) an outer radius r1, (ii) an alpha-index profile, (iii) a maximum refractive index difference Δn1 with respect to said outer cladding that is less than or equal to zero, and (iv) at said outer radius r1, a minimum refractive index difference Δnend with respect to said outer cladding; and an inner cladding positioned between said central core and said outer cladding, said inner cladding having (i) an outer radius r2, (ii) a width w2, and (iii) a negative refractive index difference Δn2 with respect to said outer cladding; wherein said central core has a maximum germanium concentration of 0.1 weight percent or less; wherein said central core has an average chlorine concentration of 0.1 weight percent or less; and wherein, at said outer radius r1, said central core has a minimum fluorine concentration of 3 weight percent or more.