Polarization-maintaining base material with simple section structure and efficient preparation method of polarization-maintaining base material

A profile, simple technology, applied in the field of simple profile structure polarization maintaining base material and its high-efficiency preparation, can solve the problems such as difficult to make breakthrough improvement, achieve the effect of reducing equipment stability requirements, high internal stress, and price reduction

Pending Publication Date: 2022-04-15
HENGTONG OPTICAL MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Looking at the above preparation processes of polarization-maintaining preform rods, most of them can be classified as different types of sleeve melting and shrinking processes, which have certain limitations in terms of product efficiency improvement and cost improvement, and it is difficult to make breakthrough improvements

Method used

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  • Polarization-maintaining base material with simple section structure and efficient preparation method of polarization-maintaining base material
  • Polarization-maintaining base material with simple section structure and efficient preparation method of polarization-maintaining base material
  • Polarization-maintaining base material with simple section structure and efficient preparation method of polarization-maintaining base material

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preparation example Construction

[0030] The high-efficiency preparation method of the simple cross-section structure polarization-maintaining base material of the present invention comprises the following steps:

[0031] A germanium-doped VAD core layer 1 and a fluorine-doped VAD outer cladding layer 2 are prepared by VAD technology. Deposition of SiO by VAD process 2 In the case of loose body, the core layer is doped with germanium, and then fluorine is doped in the outer cladding 2 of the VAD through sintering and fluorine doping process, and then heat preservation treatment in a dynamic holding furnace. The holding temperature is 1100±30°C, and the holding time is not less than 20h. The moving speed is 2-10mm / min, the rotating speed is 1-3 revolutions / min, and after the end, it is cooled to 800±25°C with the furnace; then, it is stretched in equal proportions to obtain a transparent and defect-free glass rod, where the extended diameter is recorded as D1, D1 is 33±0.5mm, the curvature of the rod body is ≤...

Embodiment 1

[0034] Such as Figure 1-4 As shown, the simple cross-sectional structure of the polarization-maintaining base material includes VAD core layer 1, VAD outer cladding layer 2 and OVD cladding layer 7 from the inside to the outside, wherein the VAD core layer 1 is doped with GeO 2 , VAD outer cladding 2 is made of pure Si, VAD outer cladding 2 is doped with fluorine, OVD cladding 7 is made of SiO 2 .

[0035] The high-efficiency preparation method of the polarization-maintaining base material with a simple cross-section structure in this embodiment includes the following steps:

[0036] 1), using VAD equipment 3, through SiCl 4Preparation of SiO by Reaction with Hydrogen Oxygen Flame 2 Bulk body, during deposition, the VAD core layer 1 is doped with GeO 2 , and its relative refractive index n1 is 0.7%; at the same time, a VAD outer cladding layer 2 is deposited outside the VAD core layer 1;

[0037] 2) Place the semi-finished product obtained in step 1) in a sintering devic...

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Abstract

The invention discloses a polarization-maintaining base material with a simple section structure and an efficient preparation method thereof, the polarization-maintaining base material sequentially comprises a VAD core layer, a VAD outer side cladding layer and an OVD cladding layer from inside to outside, germanium is doped in the VAD core layer, the relative refractive index n1 of the VAD core layer is 0.5%-0.9%, fluorine is doped in the VAD outer side cladding layer, and the relative refractive index n2 of the VAD outer side cladding layer is-0.05%--0.1%. According to the method, the advantages of VAD and OVD processes are integrated, the sintering fluorine doping process is matched, sufficient heat preservation treatment is carried out in a dynamic heat preservation furnace or a dynamic heat preservation box, the risk of core layer stress concentration explosion in the extending process is reduced, existing equipment does not need to be transformed, the output efficiency of polarization maintaining base metal is effectively improved in the aspects of product quality and yield, and the production cost is reduced. A large number of polarization-maintaining preform rods with consistent optical parameters can be prepared at a time, the batch stability is high, meanwhile, the requirement for equipment stability is lowered, the price of the polarization-maintaining preform rod base material is lowered by 30% or above, and the price competitiveness of products is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber and optical rod manufacturing, and in particular relates to a simple cross-section structure polarization-maintaining base material and a high-efficiency preparation method thereof. Background technique [0002] In recent years, high birefringence polarization maintaining fiber, referred to as polarization maintaining fiber, has gradually increased its share in the special fiber market, and its consumption has been increasing year by year. In the preparation of polarization-maintaining master rods, due to the limitations of equipment of various manufacturers, 90% of them adopt the following scheme: [0003] Such as the Chinese invention patent, the publication number is CN106007358A, and the patent name is an ultra-fine polarization-maintaining optical fiber for optical fiber gyro and its manufacturing method. It discloses that the optical fiber preform is mainly realized by precisely contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/014
Inventor 李宝东张飞劳雪刚陶泉和联科翟国华凌明胡家华
Owner HENGTONG OPTICAL MATERIAL CO LTD
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