SINGLE-MODE OPTICAL FIBER HAVING LARGE FIBER CORE DIAMETER

摘要

A single-mode optical fiber having a large fiber core diameter comprises a fiber core (001), an inner cladding, and an outer cladding (010). The fiber core (001) is used for absorbing pump light and converting to signal light; the fiber core (001) is doped with a rare earth element and other co-doping elements; the refractive index of the fiber core (001) is lower than the refractive index of the inner cladding material. The inner cladding clads the fiber core (001), and the main material of the inner cladding is pure quartz glass or other doped quartz glass, wherein two types of air holes (004, 005) are distributed; the outer cladding (010) clads the inner cladding, and the outer cladding is formed by a circle of air holes which are tightly arranged surrounding the inner cladding.