Optical Fiber Drawing Under Pressure for Lower Rayleigh Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical fiber manufacturing methods face challenges in reducing Rayleigh scattering loss and extending lead time due to the high-temperature drawing process, which affects the relaxation effect of the glass network structure, and the integration of High Isostatic Pressure (HIP) processes on optical fiber preforms increases manufacturing time.
Innovation Solution
A method and apparatus for manufacturing optical fibers by heating and drawing the preform while applying pressure to the melted-deformed portion, using a pressurization mechanism to relax the glass network structure and reduce Rayleigh scattering loss, while maintaining the relaxation effect and reducing manufacturing lead time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If High Isostatic Pressure (HIP) process is performed on optical fiber preform before drawing, then Rayleigh scattering loss is reduced, but manufacturing lead time is extremely increased
Solution Approach 1:
The patent combines the HIP process and drawing process into a single integrated operation. The preform is placed in a pressure vessel that can apply isostatic pressure while simultaneously heating and drawing the fiber. This merging eliminates the sequential execution of separate HIP and drawing processes, reducing manufacturing lead time while maintaining the stress relaxation benefits for reducing Rayleigh scattering loss
Solution Approach 2:
The patent applies isostatic pressure to the preform before the drawing process begins, during the heating phase when the glass is still relatively viscous. This preliminary application of stress during the heating phase allows the glass network to relax and reorganize before being drawn, achieving the same effect as post-drawing HIP but without the extended lead time of separate processing steps
2Productivity
If high temperature drawing process is performed on optical fiber preform, then optical fiber is produced, but relaxation effect of glass network structure is reduced
Solution Approach 1:
The patent dynamically controls the temperature and pressure parameters during the drawing process. By adjusting the heating rate, peak temperature, and pressure application timing, the process optimizes the balance between maintaining glass viscosity for drawable state and preserving stress relaxation effects. The dynamic parameter control allows the glass network to relax during controlled heating while preventing excessive thermal agitation that would destroy the relaxed structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces Rayleigh scattering loss and transmission loss in optical fibers by relaxing the glass network structure during the drawing process, maintaining the relaxation effect, and significantly shortening the manufacturing lead time compared to traditional methods.
Implementation Method 1
heating one end portion of an optical fiber preform to melt and deform the one end portion
Implementation Method 2
applying pressure to a melted-deformed portion that is melted and deformed
Implementation Method 3
a method of performing a high temperature pressurizing process called Hot Isostatic Pressing (Hot Isotropic Pressure (HIP)) on an optical fiber preform
Implementation Method 4
relaxation of the glass network structure in the optical fiber preform is promoted
Data Source
AI summary
An optical fiber manufacturing method includes: a drawing step of heating one end portion of an optical fiber preform to melt and deform the one end portion and drawing an optical fiber, wherein in the drawing step, drawing is performed while applying pressure to a melted-deformed portion that is melted and deformed.