Multi-Clad Optical Fiber Structure for Lower Silica Waste
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Solution Overview
Problem
Existing optical fiber manufacturing processes suffer from low deposition efficiency, leading to material wastage and increased raw material costs, while existing solutions do not adequately address these issues without compromising the function and quality of the optical fibers.
Innovation Solution
A multi-clad optical fiber design comprising two clad layers made of different purity levels of silica, with specific impurity and OH content, and optionally a buffer clad layer, to reduce material wastage and production costs while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical vapor deposition processes (OVD, VAD) are used to manufacture optical fiber preforms, then optical fibers can be produced, but deposition efficiency is low leading to significant material wastage and increased raw material cost
Solution Approach 1:
The cladding layer is segmented into multiple sub-layers with different purity levels (first cladding layer with <0.1% metallic impurity, second cladding layer with >0.1% metallic impurity). This segmentation allows efficient use of raw materials by matching material purity to functional requirements, reducing overall silica soot wastage while maintaining optical fiber performance.
Solution Approach 2:
Different regions of the cladding layer are assigned different material properties (purity levels). The first cladding layer uses high-purity silica where it is most needed for optical transmission, while the second cladding layer uses lower-purity silica for structural support, optimizing material efficiency throughout the fiber structure.
2Loss of substance
If low-purity silica is used in the cladding layer, then raw material cost decreases and material wastage reduces, but optical fiber performance and quality may be compromised
Solution Approach 1:
The cladding is divided into two functional zones with different purity requirements. The first cladding layer (high purity, <0.1% metallic impurity) ensures optimal optical transmission, while the second cladding layer (lower purity, >0.1% metallic impurity) provides mechanical support and stress protection. This segmentation allows cost reduction through selective material usage without compromising overall fiber performance.
Solution Approach 2:
The cladding layer is constructed as a composite structure combining two different silica materials with distinct purity levels. This composite approach optimizes both cost and performance by assigning materials to their most appropriate functional zones, achieving a balance between raw material efficiency and optical fiber quality.
Data Source
AI summary
The present invention relates to an optical fiber (100, 200, 300, 400) comprising one or more cores (102), a clad enveloping the one or more cores and a buffer clad layer (202, 302, 402) between the first clad layer and the second clad layer. Particularly, the clad includes a first clad layer (104) is made of silica with less than 0.1% metallic impurity and a second clad layer (106) is made of silica with greater than 0.1% of metallic impurity. Further, the first clad layer has less than 800 ppm OH content, less than 10 ppm aluminium and less than 2 ppm sodium and the second clad layer has less than 50 ppm OH content, more than 10 ppm aluminium and more than 2 ppm sodium.