Dehydrating device and dehydrating method for optical fiber powdery loose rod body

Abstract

The invention relates to a dehydrating device and a dehydrating method for an optical fiber powdery loose rod body manufactured by a tube-outside method. The device comprises a sintered cylinder, wherein a lower air inlet is formed at the bottom of the sintered cylinder, an air outlet is formed on the upper part of the sintered cylinder, a heating furnace is arranged at the periphery of the sintered cylinder, a rotary chuck is arranged in the sintered cylinder and is connected with a rotary shaft which extends into the cylinder from the top, the upper end of the rotary shaft extends out of the sintered cylinder and is connected with a rotary driving device, and the rotary driving device is connected with a lifting mechanism. The device is characterized in that an upper air inlet is formed in the middle part of the sintered cylinder and the upper and lower air inlets are communicated with a mixed gas source. According to the device and method provided by the invention, the uniformity of refractive index distribution of a prefabricated rod in the axial direction can be effectively improved, the problem that attenuation of the corresponding optical fiber near 1383nm is relatively high on the upper part of the prefabricated rod is effectively solved, and the utilization efficiency of the quartz optical fiber prefabricated rod is improved. The device provided by the invention is simple in structure and convenient to use.

Description

technical field [0001] The invention relates to a dehydration device and method for loose rods of optical fiber powder prepared by an external method, and belongs to the technical field of optical fiber manufacturing. Background technique [0002] At present, there are usually two ways to prepare optical fiber preforms: 1. In-tube method represented by MCVD, PCVD, etc.; 2. Out-of-tube method represented by VAD and OVD. Among them, the external method has gradually become the mainstream technology for preparing single-mode optical fiber preforms due to its advantages such as easy control of the water peak and relatively low production costs. [0003] When the optical fiber preform is prepared by the external method, there are usually the following steps, 1. The deposition process of the powder loose rod body; 2. The dehydration process of the powder loose rod body; 3. The sintering process of the powder loose rod body, finally forming a transparent Glass optical fiber prefor...

AI Technical Summary

Problems solved by technology

The results of this: 1. At the beginning of the dust preform, moisture and OH - The group removal effect is worse than other parts, resulting in a large attenuation near 1383nm in the optical fiber made from this part of the preform

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