Twisting-angle-adjustable optical fiber twisting apparatus and optical fiber twisting method

Abstract

The invention discloses a twisting-angle-adjustable optical fiber twisting apparatus and optical fiber twisting method, relating to the field of optical fibers. The optical fiber twisting apparatus comprises a first twisting wheel, a second twisting wheel, a first transmission mechanism, a second transmission mechanism, a first rotary motor, a second rotary motor, wires and an intelligent controller, wherein the first twisting wheel is connected with the first rotary motor through the first transmission mechanism; the second twisting wheel is connected with the second rotary motor through the second transmission mechanism; first rotary motor and the second rotary motor are connected with the intelligent controller through the wires; the first transmission mechanism and the second transmission mechanism are distributed symmetrically; and the first rotary motor and the second rotary motor have opposite rotation directions. According to the invention, the twisting of any angle can be realized, optical fibers can be twisted by different numbers of turns, and the twisting direction can be switched quickly; and the PMD (polarization mode dispersion) of the drawn optical fibers can be stably controlled at 0.2ps / km<1 / 2> or below.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to an optical fiber twisting device and an optical fiber twisting method with an adjustable twisting angle. Background technique [0002] When the structural size of the optical fiber makes the normalized frequency of the optical fiber meet the condition V<2.405, only the fundamental mode HE will be transmitted in the optical fiber 11 , while the schema HE 11 Contains two mutually orthogonal eigenmodes HE 11x and HE 11y , two eigenmodes HE 11x and HE 11y Propagate along the z direction of the fiber axis in the fiber. At this time, the transmission characteristics of the fiber depend on whether there is birefringence in the fiber itself. When the single-mode fiber is ideal, that is, its cross-section has no distortion, it is a complete true circle, and there is no internal stress in the fiber core, the fiber itself is straight, and its refractive index is uniform along the fiber...

AI Technical Summary

Problems solved by technology

At present, the common optical fiber rubbing methods include constant speed rubbing fiber and sinusoidal fiber rubbing. The number of fiber twisting circles that can be obtained is less than 50 turns / m. These two twisting methods cannot realize the positive and negative directions of the fiber Uniform and symmetrical twisting, the PMD of the drawn fiber cannot be stably controlled at 0.2ps / km 1 / 2 the following

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