Single-mode optical fiber and manufacturing method thereof

Abstract

The invention provides a single-mode optical fiber. The single-mode optical fiber includes a core layer and a cladding layer, the outer side of the core layer is provided with the cladding layer, thecladding layer includes a first cladding layer and a second cladding layer, the inner side of the first cladding layer is connected with the outside of the core layer, and the outer side of the firstcladding layer is connected with the inner side of the second cladding layer; and the invention further provides a manufacturing method of the single-mode optical fiber, the manufacturing method includes the following steps that step 1) powder-like loose bodies are prepared; step 2) the powder-like loose bodies are treated; step 3) fiber prefabrication rods are manufactured; step 4) the fiber prefabrication rods are treated; and step 5) wiredrawing is conducted. The single-mode optical fiber and the manufacturing method thereof have the beneficial effects that multiple variable scan be adjusted in the aspects of fiber design and manufacturing, the multiple variables are correspondingly a core layer diameter r1, the first cladding layer diameter r2 and refractive index difference valves [delta] 1, [delta] 2, [delta] 3 and [delta] 4, by changing the valves, the internal stress in fiber wiredrawing is reduced advantageously, Rayleigh scattering of the fiber is reduced, and loss valves ofthe fiber are further decreased as a whole.

Description

technical field

[0001] The invention belongs to the field of communication optical fiber manufacturing, and in particular relates to a single-mode optical fiber and a manufacturing method thereof. Background technique

[0002] With the development of optical communication technology, single-mode fiber has been widely used in the world, especially G.652 single-mode fiber, the laying volume of the world has reached more than 1 billion core kilometers. In order to solve a series of problems in the development of optical communication, single-mode optical fibers such as G.655 dispersion-shifted optical fiber, G.657 bend-insensitive optical fiber, and G.654 ultra-low loss optical fiber were invented successively. With the maturity of wavelength division multiplexing technology, dispersion is no longer the main problem of optical fiber transmission. At present, the development direction of optical fiber is mainly towards lower loss and better bending performance. At the same time,...

Examples

Embodiment Construction

[0031] In the cross-section design of the optical fiber of the present invention, the core layer is doped with Ge element to increase the refractive index. Compared with pure SiO2 quartz glass, the refractive index difference is Δ1, and the core layer diameter is 2r1. The first cladding layer is uniformly doped with F elements to reduce the refractive index. The refractive index difference relative to pure SiO2 quartz glass is Δ2, and the diameter of the second cladding layer is 2r2. The second cladding layer is gradiently doped with F elements, which is used to match the core-in-pack viscosity difference of the optical fiber preform during the drawing process, and suppress the yearning expansion of F elements in the second cladding layer. The inner refractive index of the second cladding layer is relative to the second cladding layer. The refractive index difference of the cladding is Δ4, the refractive index difference of the outer refractive index of the second cladding rela...

technical field

[0001] The invention belongs to the field of communication optical fiber manufacturing, and in particular relates to a single-mode optical fiber and a manufacturing method thereof. Background technique

[0002] With the development of optical communication technology, single-mode fiber has been widely used in the world, especially G.652 single-mode fiber, the laying volume of the world has reached more than 1 billion core kilometers. In order to solve a series of problems in the development of optical communication, single-mode optical fibers such as G.655 dispersion-shifted optical fiber, G.657 bend-insensitive optical fiber, and G.654 ultra-low loss optical fiber were invented successively. With the maturity of wavelength division multiplexing technology, dispersion is no longer the main problem of optical fiber transmission. At present, the development direction of optical fiber is mainly towards lower loss and better bending performance. At the same time,...

Examples

Embodiment Construction

[0031] In the cross-section design of the optical fiber of the present invention, the core layer is doped with Ge element to increase the refractive index. Compared with pure SiO2 quartz glass, the refractive index difference is Δ1, and the core layer diameter is 2r1. The first cladding layer is uniformly doped with F elements to reduce the refractive index. The refractive index difference relative to pure SiO2 quartz glass is Δ2, and the diameter of the second cladding layer is 2r2. The second cladding layer is gradiently doped with F elements, which is used to match the core-in-pack viscosity difference of the optical fiber preform during the drawing process, and suppress the yearning expansion of F elements in the second cladding layer. The inner refractive index of the second cladding layer is relative to the second cladding layer. The refractive index difference of the cladding is Δ4, the refractive index difference of the outer refractive index of the second cladding rela...

Images