Manufacture method for polarization maintaining fiber and polarization maintaining fiber

Abstract

The invention provides a manufacture method for polarization maintaining fiber and a polarization maintaining fiber, and relates to optical waveguide fibers in the field of fiber-optical communication and fiber optical sensors. The method comprises the following steps that: (1) two oppositely arranged open slots with a same shape are inwardly provided at a side surface of a glass mother rod, stress rods are machined to obtain a shape matching the open slots, and the centers of the cross sections of the two open slots and the center of circle in the cross section of the glass mother rod are in a same line; (2) the stress rods are respectively inserted into each open slot on the glass mother rod, and the assembled glass mother rod and stress rods are put in a cannula to form a preformed rod of the polarization maintaining fiber; (3) the preformed rod of the polarization maintaining fiber is drew to form the polarization maintaining fiber. According to the invention, the glass mother rod is provided with the open slots, and the stress rods are embedded in the open slots, thereby obtaining high process repeatability; inner surfaces of the open slots have high fineness, and the open slots have good symmetry, thereby improving processing efficiency; therefore, the optical performance and reliability of the polarization maintaining fiber are substantially improved.

Description

technical field [0001] The invention relates to an optical waveguide fiber in the fields of optical fiber communication and optical fiber sensing, in particular to a method for manufacturing a polarization-maintaining optical fiber and the polarization-maintaining optical fiber. Background technique [0002] Transverse Spatial Mode HE for Standard Single-Mode Optical Fiber Transmission 11 , are actually two orthogonal modes HE 11 x and HE 11 y The degenerate mode of , in this mode the modal transmission constant βx≈βy. However, due to the fact that the actual single-mode fiber is not ideally circular in geometric size, as well as the influence of external stress, bending and torsion and other factors, the mode degeneracy is destroyed. The two modal transmission constants βx and βy are different, resulting in the mode State birefringence (geometric birefringence and stress birefringence), resulting in a phase difference between the orthogonal mode components and a delay ...

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Problems solved by technology

However, drilling requires high-precision mechanical finishing. Due to the relationship between precision, a slight deviation will result in high roughness of the inner surface of the processed hole and poor symmetry between the two processed holes; in addition, the requirements for the drill bit are high. Small force is not easy to satisfy. As the processing depth increases, the tip of the drill bit will swing outward by centrifugal force, the exit of the processing hole will be larger than the entrance of the processing hole, and the processing efficiency is low; in summary, it will affect all The strength and optical properties of the processed PM fiber are adversely affected

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