Manufacture of low polarization mode dispersion single mode optical fibers and products thereby

Abstract

The invention relates to a manufacturing method of a low polarization mode dispersion single-mode optical fiber and an optical fiber prepared by the method. A rubbing system is installed at the downstream end of the conventional drawing tower. The rubbing method does not change the drawing path of the optical fiber. The axis of the rubbing wheel swings periodically in a plane parallel to the drawing direction. The surface rotates around its axis. When there is a certain angle between the plane of the rubbing wheel and the wire drawing direction, the angular velocity component along the radial direction of the fiber reacts on the fiber to make it twist, and propagates to the vitreous softening area upstream of the wire drawing in the form of mechanical waves. Produce plastic deformation and solidify into the newly drawn optical fiber, so that the fiber introduces a non-sinusoidal twisted distribution of frequency and amplitude disorder along the length direction, and increases the energy coupling between the two orthogonal modes that cause the birefringence phenomenon of polarization mode dispersion, The optical fiber polarization mode dispersion coefficient manufactured by this method is lower than 0.03ps / km 1 / 2 .

Description

technical field [0001] The invention relates to a manufacturing method of a single-mode optical fiber, in particular to a manufacturing method of a PMD single-mode optical fiber with low polarization mode dispersion. The invention also relates to optical fibers prepared by this method. Background technique [0002] In recent years, with the rapid growth of people's demand for communication bandwidth, the single-channel transmission rate of telecommunications backbone networks in many countries is developing from Gb / s level to Tb / s level, which should be attributed to the erbium-doped fiber amplifier EDFA and other optical devices Applications. However, they also bring about a serious problem, which is to accumulate the original small polarization effects, such as polarization mode dispersion PMD, polarization dependent loss PDL and other adverse effects, and finally have a non-negligible impact on the optical fiber communication system. Since PDL ...

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Problems solved by technology

However, the implementation method introduced in the above patent changes the path of the optical fiber in the original drawing process, causing the optical fiber to deviate from the alignment of the drawing system. This implementation method is not conducive to the process control of the normal drawing process and increases the difficulty of equipment maintenance. At the same time, the resistance to the forced rotation of the optical fiber is increased, which weakens the ability of the rubbing system introduced in the above patent to generate torque

In addition, the above-mentioned patent introduces that the prerequisite for a good rubbing effect by rubbing is that the optical fiber is in close contact with the surface of the rubbing wheel, but the force between them comes from the horizontal component force of the drawing traction force, and its magnitude depends on the optical fiber on the surface of the rubbing wheel. At the same time, considering the sliding of the optical fiber on the surface of the rubbing wheel, it is certain that the optical fiber will inevitably jump on the surface of the rubbing wheel, and it cannot ensure that the torque of the rubbing wheel is effectively transmitted to the optical fiber.

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