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Erbium-doped polarization-maintaining active optical fiber and preparation method thereof

A technology of optical fiber and fiber core, applied in the field of erbium-doped polarization-maintaining active optical fiber and its preparation

Active Publication Date: 2021-04-02
JIANGSU FASTEN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the development of optical fiber communication technology and optical fiber sensing technology, especially in some coherent communication and coherent sensing systems, it is necessary to have a light source with stable polarization and high power output or to amplify weak signals at the coherent receiving end. Erbium-doped fiber amplifiers cannot meet the requirements because they will change the polarization state of the laser during the amplification process. This requires a fiber amplifier that can maintain the polarization characteristics of the laser and achieve high gain, so that the polarization extinction ratio can reach more than 20dB , which requires a polarization-maintaining erbium-doped fiber to amplify polarized light

Method used

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  • Erbium-doped polarization-maintaining active optical fiber and preparation method thereof
  • Erbium-doped polarization-maintaining active optical fiber and preparation method thereof
  • Erbium-doped polarization-maintaining active optical fiber and preparation method thereof

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Embodiment 1

[0042] A method for preparing an erbium-doped polarization-maintaining optical fiber, comprising the steps of:

[0043] (1) Pretreatment of the substrate tube to preheat the substrate tube and effectively eliminate impurities and air bubbles on the inner wall of the substrate tube. The preheating temperature: 800°C, and the preheating time: 5 minutes;

[0044](2) Carry out in-tube deposition. The deposition process is followed by pure silicon cladding deposition, stress layer deposition, and pure silicon cladding deposition. The deposition temperature of the pure silicon cladding 1 is 1900 ° C. 4 The deposition flow rate is 20-300sccm, the deposition rate is 10mm / min, and the number of deposition layers is 2 layers; the stress layer deposition 2 temperature is 1700°C, SiO 2 Flow: 200sccm, GeCl 4 Flow: 50sccm, BCl 3 Flow rate: 800sccm, deposition rate is 20mm / min; the deposition temperature of the pure silicon cladding 1 is 1900°C, SiCl 4 The deposition flow rate is 20sccm, ...

Embodiment 2

[0051] A method for preparing an erbium-doped polarization-maintaining optical fiber, comprising the steps of:

[0052] (1) Pretreatment of the substrate tube to preheat the substrate tube and effectively eliminate impurities and air bubbles on the inner wall of the substrate tube. The preheating temperature: 900°C, and the preheating time: 7 minutes;

[0053] (2) In-tube deposition is carried out, and the deposition process is followed by pure silicon cladding deposition, stress layer deposition, and pure silicon cladding deposition; wherein the deposition temperature of the pure silicon cladding 1 is 2000 ° C, SiCl 4 The deposition flow rate is 50 sccm, the deposition rate is 50 mm / min, and the number of deposition layers is 3 layers; the stress layer deposition 2 temperature is 1800 ° C, SiO 2 Flow: 250sccm, GeCl 4 Flow: 60sccm, BCl 3 Flow rate: 900sccm, deposition rate is 40mm / min; the deposition temperature of the pure silicon cladding 1 is 2100°C, SiCl 4 The depositio...

Embodiment 3

[0060] A method for preparing an erbium-doped polarization-maintaining optical fiber, comprising the steps of:

[0061] (1) Pretreatment of the substrate tube to preheat the substrate tube and effectively eliminate impurities and air bubbles on the inner wall of the substrate tube. The preheating temperature: 1000°C, and the preheating time: 10 minutes;

[0062] (2) Carry out in-tube deposition. The deposition process is followed by pure silicon cladding deposition, stress layer deposition, and pure silicon cladding deposition, wherein the deposition temperature of the pure silicon cladding 1 is 2200°C, SiCl 4 The deposition flow rate is 300sccm, the deposition rate is 100mm / min, and the number of deposition layers is 5 layers; the stress layer deposition 2 temperature is 1900°C, SiO 2 Flow: 300sccm, GeCl 4 Flow: 100sccm, BCl 3 Flow rate: 1000sccm, deposition rate is 60mm / min; the deposition temperature of the pure silicon cladding layer 1 is 2200°C, SiCl 4 The deposition f...

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Abstract

The invention relates to an erbium-doped polarization maintaining active optical fiber, the cross section structure of which sequentially comprises a fiber core (1), a cladding (2), an inner coating (4) and an outer coating (5) from inside to outside. The cladding (2) is internally provided with two stress regions (3), the two stress regions (3) are symmetrically arranged on the two sides of the fiber core (1), the modulus of the inner coating (4) is smaller than the modulus of the outer coating (5), the refractive index difference delta 1 of the fiber core (1) relative to the cladding (2) is0.005 to 0.01, and the refractive index difference delta 2 of the stress regions (3) relative to the cladding (2) is -0.0080 to -0.0120. The absorption of the optical fiber is higher than that of a panda type polarization maintaining optical fiber, so that the use length of the optical fiber in a laser is shorter, and the same light beam quality and polarization characteristic as those in a low-power environment are obtained under higher power.

Description

technical field [0001] The invention relates to an erbium-doped polarization maintaining active optical fiber and a preparation method thereof. Background technique [0002] With the rapid application of 5G communication, communication capacity has shown explosive growth, and long-distance and large-capacity optical fiber communication systems have increasingly become a necessary development trend. At present, the optical fiber amplifier in the market is an indispensable key device in the optical fiber communication system. It not only can directly amplify the optical signal, but also has the functions of real-time, high gain, broadband, online, low noise and low loss. Optical fiber amplifiers mainly include erbium-doped optical fiber amplifiers, which are widely used in long-distance, large-capacity, high-speed optical fiber communication systems, access networks, optical fiber CATV networks, military systems and other fields due to their superior performance. [0003] Wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/024G02B6/02C03C13/04C03B37/018C03B37/027
CPCG02B6/024G02B6/02C03C13/045C03B37/018C03B37/01853C03B37/02709
Inventor 冯术娟赵霞宋海瑞缪振华卞新海侯树虎徐律韩婷婷周震华
Owner JIANGSU FASTEN OPTOELECTRONICS TECH