Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for making rare earth doped optical fibre

An optical fiber, rare earth technology, applied in cladding fiber, optical waveguide light guide, glass manufacturing equipment, etc., can solve the problems of pulse broadening and capacity damage.

Inactive Publication Date: 2006-09-13
信息技术部 +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] vi) It is believed that: Residual stress produces polarization mode dispersion (PMD), causing severe impairment of capacity, including pulse broadening

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for making rare earth doped optical fibre
  • Process for making rare earth doped optical fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] Accordingly, the present invention provides an improved method of preparing rare earth-doped optical fibers comprising (a) depositing doped P 2 o 5 and F synthetic cladding to obtain a matched or depressed (depressed) cladding-type structure, (b) forming the core by depositing a layer of unsintered particles at a tube surface temperature of 1200-1400 °C, (c) In the granular layer make P 2 o 5 and GeO 2 The concentration of F is kept at 0.5-5.0% (mole) and 3.0-25.0% (mole), respectively, to obtain a tube comprising a cladding and a porous soot layer doped with F, (d) soaking the tube comprising a porous soot layer in the solution For 1-2 hours, the solution contains RE salt with a concentration of 0.002-0.25M, and also contains or does not contain aluminum salt with a concentration of 0.05-1.25M, (e) at a speed of 10-50cc / min The solution is drained off, (f) the porous layer is dried by passing dry nitrogen or any other inert gas through the tube, (g) the tube is gra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides an improved process for making rare earth doped preforms and fibres by a combination of MCVD technique and solution doping method, said method comprising developing matched or depressed clad structure inside a silica glass substrate tube followed by deposition of unsintered particulate layer containing GeO2 and P2O5 for formation of the core and solution doping by soaking the porous soot layer into an alcoholic / aqueous solution of RE-salts containing co-dopants like AlCl3 / Al(NO3)3 in definite proportion, controlling the porosity of the soot, dipping period, strength of the solution and the proportion of the codopants to achieve the desired RE ion concentration in the core and minimise the core clad boundary defects and followed by drying, oxidation, dehydration and sintering of the RE containing porous deposit and collapsing at a high temperature to produce the preform and overladding with silica tubes of suitable dimension and fibre drawing to produce fibres.

Description

technical field [0001] The invention relates to a preparation method of rare earth-doped optical fiber. Background technique [0002] Optical fibers doped with rare earths (REs) have great potential for applications in many fields including amplifiers, fiber lasers, and sensors. Rare earth oxides are doped as active species into the core of such fibers. Doping with various rare earths has been shown to produce lasing and amplification in several wavelength ranges, however, for communications, erbium-doped fiber (EDF) remains the most important because it operates at the same wavelength as the third lowest The lossy optical window is matched. [0003] Erbium-doped fiber amplifiers (EDFAs), which operate in a low loss window of about 1.53 μm, play a key role in today's high-capacity communication systems. It is capable of amplifying optical signals directly, independent of the modulation format. The opto-repeaters used to date in such systems are 3R elements, but their amp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018H01S3/067G02B6/02
CPCC03B37/01807C03B2201/36C03B2201/34C03B2201/12C03B2201/28C03B37/01838C03B37/01853C03B2201/31Y02P40/57C03B37/018
Inventor T·班迪帕德哈亚R·森S·K·布哈德拉K·达斯古普塔M·C·保罗
Owner 信息技术部