Dispersion compensation optical fibre with low polarization mode dispersion
A dispersion compensation fiber, modal dispersion technology, applied in the directions of light guides, optics, optical components, etc., can solve the problems of material stress inhomogeneity, large gradient of refractive index change, and difficulty in meeting the requirements
Inactive Publication Date: 2004-04-28
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Problems solved by technology
However, since the dispersion compensating fiber has a higher core refractive index, a deeper sinking layer, that is, a large gradient of refractive index change, will inevitably result in a larger geometric out-of-roundness and material stress inhomogeneity, resulting in a higher polarization Mode dispersion, and higher polarization mode dispersion is difficult to meet the requirements of high-speed communication transmission system
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[0014] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0015] In the first embodiment, the core glass region has five stratifications 1, 2, 3, 4, 5 and the fourth stratification has a negative delta %, cladding 7 outside the core glass region. The radii of the individual layers range from the first layer to about 0.5 to 0.7 microns, 1.0 to 1.2 microns, 1.4 to 2.0 microns, 3.5 to 4.5 microns, and 5 to 6.5 microns outward; The first delamination starts outward at approximately 1.7 to 2.2%, 1.1 to 1.5%, 0.6 to 1%, -0.4 to -0.7%, and 0.1 to 0.4%, respectively, as figure 1 As shown, a negative total dispersion and a negative dispersion slope not greater than -150 ps / nm-km are obtained at 1550 nanometers, which is used to offset the positive slope of the communication link fiber operating in the 1550 nanometer window. Typically, the negative slope of the total dispersion is in the range of -0.1 to -5.0 ps / nm2-km....
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This ivnention relates to a dispersion compensation optical fiber to a controlled sum negative dispersino and a rathor large of dispersion gradient containing a central fiber chips glass area which is separated by four layers in which delta % is positive for the first layer and delta % is negative for at least another one, in between, existing 1-3 layers of transitional layers with degression of the delta % to get larger than -150 ps / nm km at 1550 nanometer place with the polarized mask dispersion of about 0.1 ps / nm km. The invention enables the optical communicaltion system to a high level operating at 1550 nano-wavelength window with the optical fiber easy to insert into the communication chain and to tolerate high speed and large volume transmission of its sum dispersion performance, attenuation polarization mask dispersion at the working window close to 1550 nanometer to satisfy the demand of high speed transmission system of 40 G bit / s or even higher.
Description
technical field [0001] The present invention relates to a single-mode optical fiber with controlled negative total dispersion and a relatively large negative dispersion slope. In particular, the dispersion slope of the single-mode fiber is negative and has extremely low polarization mode dispersion. Background technique [0002] The dispersion of the optical fiber will cause the signal waveform to be distorted, which is a restrictive factor for long-distance transmission. Theoretical analysis shows that the higher the rate of the transmission system, the smaller the allowable dispersion. In order to reduce the impact of dispersion, the current effective way to solve the impact of fiber dispersion on system performance is to use dispersion compensation technology, that is, to use dispersion compensation fiber for dispersion compensation. [0003] The dispersion characteristic of the dispersion compensating fiber is mainly determined by the waveguide dispersion. Therefore, ...
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Inventor 王铁军曹宇青罗杰
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD