Method for manufacturing panda type polarization-preserving fiber

Abstract

The invention relates to a manufacture method of a polarization maintaining optical fibre, which comprises the following steps: a mandrel and stress application performs are depositionally made with a deposition method, the mandrel and a quartz sleeve are melted to be draught into an optical fibre perform with a fibre core and a covering, and the two stress application performs are respectively inserted into two holes of the perforated optical fibre perform to form a combined optical fibre perform. The combined optical fibre perform is put into a fibre drawing tower for drawing to be made into a panda type polarization maintaining optical fibre. During drawing, the temperature in the drawing tower is controlled within 1700 DEG C to 2000 DEG C, the optical fibre drawing tension is controlled at over 30g, and the optical fibre drawing speed is controlled at over 300m / min. The invention has simple process and high reliability. The high-tension and high-speed drawing reduces the fluctuation of the optical fibre drawing speed so as to improve the geometrical consistency of the optical fibre, optimize the service performances of the polarization maintaining optical fibre, and improve the drawing production efficiency, and thus the capacities of tension screening, dynamic fatigue and tensile resistance of the polarization maintaining optical fibre meet or are even superior to relative index requirements.

Description

technical field [0001] The invention relates to a method for manufacturing a polarization-maintaining optical fiber, in particular to a method for manufacturing a panda-type polarization-maintaining optical fiber at high speed and high tension. The invention can be used to manufacture polarization-maintaining optical fibers and single-mode single-polarization optical fibers working at various wavelengths. Background technique [0002] Polarization maintaining fiber, that is, polarization maintaining fiber, is a type of fiber that maintains the linear polarization direction of the transmitted light. Polarization-maintaining optical fiber can be applied in many fields, such as multiplexing coherent communication, fiber optic gyroscope, fiber optic hydrophone, polarization sensing, etc. Polarization maintaining fiber is a special fiber type with wide application value. [0003] In ordinary communication optical fiber, due to its circular symmetry structure, after a certain di...

AI Technical Summary

Problems solved by technology

[0007] First: It complicates the production process of polarization-maintaining optical fiber and reduces the stability of the production process of polarization-maintaining optical fiber;

[0008] Second: Low tension drawing conditions make the fiber more likely to vibrate during the drawing process, which intensifies the wire diameter fluctuation of the polarization-maintaining fiber;

[0009] Third: Low-speed drawing conditions will deteriorate the mechanical properties of polarization-maintaining optical fibers, making it difficult for optical fibers to meet the screening conditions of 1% and above required for applications;

[0010] Fourth: The complex process and low drawing speed reduce the production efficiency of polarization maintaining optical fiber

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