Dispersion compensating transmission optical fiber matched with orthochromatic dispersion and ortho chromatic dispersion slope unimodel optical fiber and use

Abstract

The waveguide structure of single-mode optical fibre comprises layered fibre core and layered clad. The fibre core is set with two core layers in different refractive indexed and layered clad consists of five layered clads. The codeposition of fluorine and germanium is applied by utilizing PCVD process to replace independent deposition of fluorine or germanium in deposition process for fibre core and clad so optical, mechanical and environmental performance of optical fibre is very much improved. The single-mode optical fibre produced in the present invention can be used in transmission of DWDM system.

Description

technical field [0001] The present invention relates to a class of negative dispersion single-mode optical waveguide fiber designed for large-capacity and high-speed transmission systems and the use of the fiber. Specifically, the involved single-mode fiber has certain negative dispersion and negative dispersion slope at 1450-1675nm , with low attenuation, low polarization mode dispersion (PMD), large effective area, low splice loss, excellent bending resistance and environmental characteristics. Background technique [0002] Since the mid-1990s, with the development of erbium-doped fiber amplifiers and wavelength division multiplexing technology, optical fiber communication has entered an unprecedented high-speed development stage. With the development of wavelength division multiplexing, it is found that nonlinear effects between wavelengths, such as four-wave mixing, self-phase modulation, cross-phase modulation, etc., limit the expansion of system...

AI Technical Summary

Problems solved by technology

At present, the most widely used method is to add a module composed of dispersion compensating fiber (DCF) to the fiber link. For DCF, in order to obtain a large negative dispersion, the refractive index of the fiber core is high and the geometry The size should be small, so that in the core of the DCF, the amount of germanium doped is relatively large, so that the attenuation, PMD and nonlinear effects of the DCF will be relatively poor

In addition, another disadvantage of using the DCF method is that DCF increases the system attenuation, system cost, PMD and nonlinear effects, but does not increase the length of the system

[0003] Patent CN1351267A / US 2002 / 0076186A1 discloses a fiber with positive dispersion for in-line compensation of dispersion, but its negative dispersion at 1550nm is only -12ps / (nm.km) to -4ps / (nm .km), it is impossible to fully compensate the commonly used G652 optical fiber (the dispersion at 1550nm is greater than 16ps / (nm.km)). In addition, the dispersion with a small absolute value makes it account for a large proportion in the link. Its small effective area and large PMD are bound to have adverse effects on transmission

[0004] In the patent US 2002 / 0176678A1, an anti-dispersion optical fiber with better optical performance and related links are introduced, but as a dispersion compensation optical fiber used in the line, it needs to be cabled and used in conjunction with a conventional positive dispersion single-mode optical fiber, so In addition to having good optical properties, especially good environmental properties and good splicing properties are also required, which are closely related to the material structure design of optical fibers, but are not mentioned in the above patents

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