Jiangsu University

State Grid Corporation of China

State Grid Jiangxi Electric Power Company Information & Telecommunication Branch

Jihai Yang

Mingyang Chen

Luming Li

Hua Wang

Zhimin Cai

Pingping Fu

Guodong Cao

Jun Li

Hongliang Chu

Hui Tian

Fang Yin

Xiaosheng Wu

Renhua Li

Yuanfeng Zhu

Ping Yin

Jin Wei

Shenyi Li

Meilan Zheng

Hui Xiao

The refractive index of a fiber core of a few mode optical fiber is n1. A cladding layer surrounding the fiber core includes: a downward-concave cladding layer surrounding the fiber core, the refractive index thereof is n2; a first upward-convex cladding layer surrounding the downward-concave cladding layer, the refractive index thereof is n3; a second upward-convex cladding layer surrounding the first upward-convex cladding layer, the refractive index thereof is n4; an outer layer surrounding the second upward-convex cladding layer, the refractive index thereof is n5. The refractive indexes of the fiber core, the downward-concave cladding layer, the first upward-convex cladding layer, the second upward-convex cladding layer, the outer layer satisfy: n&#x3e;n3&#x3e;n&#x3e;n&#x3e;n. The fiber is a non-single mode in a direct waveguide state, and equivalent single-mode transmission can be achieved when the optical fiber is bent at a specific bending radius.

Few-mode optical fiber

Provided is a few-mode optical fiber. The optical fiber includes: a core and a cladding enclosing the core. The cladding includes: a first inner cladding surrounding the core; a first high-refractive-index mode filter layer surrounding the first inner cladding; a second inner cladding surrounding the first high-refractive-index mode filter layer; a second high-refractive-index mode filter layer surrounding the second inner cladding; and an outer cladding surrounding the second high-refractive-index mode filter layer.

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Nanchang, China

Jihai Yang