Single-mode optical fiber optimizing dispersion characteristic

Abstract

A single-mode optical fiber for optimizing dispersion characteristic belongs to the optical communication technology, and solves the problem of the nonlinearity and polarized mode dispersion influencing the high-speed communication in the prior art. The single-mode optical fiber comprises a first layer and a second layer which form the optical fiber core layer, and a third layer, a fourth layer and an outer cladding which form the fiber cladding, wherein the refractive index of the first layer is in step-shaped distribution; the refractive index of the second layer is in ladder-shaped distribution; the refractive indexes of the third and the fourth layers are in sep-shaped distribution; the outer cladding is the pure silicon dioxide glass cladding; the refractive index distribution of the optical fiber core layer is that n1 is larger than n2, and n2 is larger than nc; the refractive index distribution of the optical fiber cladding is that n4 is larger than nc, and nc is larger than n3, wherein ni is the refractive index of the optical fiber of the (i)th layer; and nc is the refractive index of the outer cladding. The single-mode optical fiber has a lower dispersion slope, a proper dispersion area and a proper effective area; and the single-mode optical fiber has the advantages of low polarization mode dispersion, low loss, excellent anti-bending property and low fusion loss when fusing with the optical fiber so that the single-mode optical fiber is applicable to the high-capacity, high-speed and long-distance DWDM system transmission.

Description

technical field [0001] The invention belongs to the optical communication technology, and in particular relates to a non-zero dispersion displacement single-mode optical fiber designed for a large-capacity, high-speed, long-distance transmission system. The single-mode fiber has optimized dispersion characteristics, that is, appropriate dispersion and low dispersion slope, moderate effective area, low polarization mode dispersion, low loss and excellent bending resistance, and has low splice loss when splicing with optical fiber, etc. Advantages, suitable for large-capacity, high-speed, long-distance DWDM system transmission, its low dispersion slope is conducive to comprehensive and accurate management of dispersion, and the moderate effective surface is conducive to obtaining high Raman amplification efficiency, meeting C, C + L-band long-distance transmission. Background technique [0002] With the development of optical fiber communication technology, especially the mat...

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Problems solved by technology

[0007] In the actual long-distance optical fiber transmission system, it is usually necessary to connect different optical fibers to form a communication link. The refractive index distribution of the non-zero dispersion-shifted fiber is more complicated than that of the standard single-mode fiber. When they are together, due to the mismatch between the mode length and diameter of each other and the geometric parameters of the fiber, it often leads to increased reflection and increased additional loss. The longer the link, the more contacts, the greater the cumulative effect, and serious may cause unacceptable bit errors. Rate

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