Fiber core-cladding ratio adjustable optical fiber preform extrusion method and device

Abstract

The invention relates to a fiber core-cladding ratio adjustable optical fiber preform extrusion method and device. The method includes: drying a alcohol washed fiber core chalcogenide glass ingot and cladded chalcogenide glass ingot, and putting the fiber core chalcogenide glass ingot and the cladded chalcogenide glass ingot into a vacuum container; selecting an extrusion head center push rod meeting the demand, and selecting a protective casing pipe corresponding to the center push rod; putting the fiber core chalcogenide glass ingot into the protective casing pipe, putting the protective casing pipe and the cladded chalcogenide glass ingot into an extrusion die in order, and putting the extrusion die into an extrusion cylinder; performing vacuum pumping on the vacuum chamber to a vacuum degree lower than 10<-2>Pa, supplementing inert gas to the vacuum chamber until the air pressure inside the chamber is equal to the external atmospheric pressure; setting the temperature of a heating furnace group, an annealing furnace and the extrusion die, after softening the chalcogenide glass, carrying out pushing and traction by a pushing mechanism and a traction device to obtain an extrusion rod, and subjecting the extrusion rod to annealing treatment to obtain the optical fiber perform meeting the requirement, thus realizing preparation of optical fiber preforms of arbitrary fiber core-cladding ratio.

Description

technical field [0001] The invention relates to the field of preparation of optical fiber preforms, in particular to an extrusion method and device for optical fiber preforms with an adjustable fiber core-cladding ratio. Background technique [0002] Chalcogenide glass optical fiber has excellent mid-to-far infrared transmission characteristics, its transmission range can be from 0.5 μm to 1 μm to 12 μm to 25 μm, the refractive index is between 1.8 and 3.5, and it has a very high nonlinear refractive index n 2 (n 2 =2~20×10 -18 m 2 / W). Due to its excellent infrared transmission properties, chalcogenide glass optical fibers have shown great application value in the fields of mid-infrared laser energy transmission, spatial nulling interferometer, mid-infrared biological and chemical sensors, and mid-infrared fiber lasers. At present, the methods for preparing single-mode chalcogenide glass optical fibers mainly include sleeve method, double crucible method and extrusion m...

AI Technical Summary

Problems solved by technology

[0008] Therefore, the preparation of single-mode optical fiber preform by traditional extrusion method is complicated and the core-cladding ratio cannot be adjusted flexibly.

In addition, in the traditional extrusion method, when preparing optical fiber preforms with different core-cladding ratios, the entire extrusion mold needs to be changed, and glass materials of new sizes need to be prepared. The workload is heavy and the work is extremely cumbersome, and the efficiency is very low.

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