Large cross-section single-mode fiber

Abstract

The invention discloses a single-mode optical fiber with a large cross section, which includes a core layer structure and a cladding layer structure. The core layer structure includes two lightly doped SiO2 with unequal radii and semicircular cross sections 2 For the core layer, the planes where the diameters of the two core layers are located and the centers of the cross-sections coincide; the cladding structure is wrapped around the core layer structure, and the outer edge cross-section of the cladding structure is circular, and the center of the circle is the cross-section of the core layer. The centers of the circles coincide, and the cladding structure is heavily doped SiO 2 form. The optical fiber core layer of the invention has a larger cross-sectional area, which is favorable for transmitting high-power single-mode light.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and particularly relates to a large cross-sectional area optical fiber. Background technique [0002] With the rapid development of optical fiber technology, it has been widely used in the fields of optical fiber communication, laser processing and high-power weapons. With the continuous improvement of optical power requirements for transmission in optical fibers, ordinary single-mode optical fibers also face many problems. As the power transmitted in the fiber is getting higher and higher, nonlinear effects such as stimulated Raman scattering and stimulated Brillouin scattering will occur, and these nonlinear effects usually reduce the laser transmission efficiency. cause damage. At present, there are multi-mode commercial fibers with large cross-sections, but there is a lack of single-mode fibers with large cross-sections. [0003] In recent years, through the continuous exploratio...

AI Technical Summary

Problems solved by technology

But this kind of optical fiber has a fatal shortcoming. It is difficult to prepare in terms of technology, which greatly increases the manufacturing cost and cannot be widely used.

[0004] figure 1 and figure 2 There are two common fiber structures: figure 1 It is an ordinary single-mode fiber with small core radius, large mode loss and low nonlinear threshold; figure 2 It is a single-mode photonic crystal fiber, and its preparation is complicated

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