Microfabricated Ferrule Mold for Sub-Micron Fiber Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing multi-fiber optical connectors, particularly for single-mode fibers, face challenges in achieving precise alignment and high-density fiber arrays due to limitations in traditional polymer molding techniques, leading to poor optical performance and sensitivity to dust and contaminants.
Innovation Solution
A microfabrication method involving the creation of a ferrule mold with sub-micron precision for forming a non-polymeric multi-fiber connector ferrule, using microfabrication techniques such as photolithography and electroplating to achieve precise alignment and recessed fiber endfaces, and applying an antireflection coating for improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional polymer molding techniques are used to manufacture multi-fiber optical connectors, then the manufacturing process is simple and cost-effective, but the alignment precision of fiber holes and guide holes deteriorates significantly
Solution Approach 1:
The patent replaces traditional mechanical polymer molding with a microfabrication process using silicon wafers, photolithography, and electroplating. This substitution enables sub-micron alignment precision (better than 1 micron) for fiber holes and guide holes, resolving the contradiction between manufacturing precision and ease of manufacture by achieving high precision through semiconductor fabrication techniques rather than conventional molding.
Solution Approach 2:
The patent changes the material parameter from polymer to silicon, and the fabrication parameter from molding to photolithography/electroplating. This parameter change enables the formation of high-precision 2D fiber hole arrays with sub-micron accuracy, directly addressing the alignment precision problem while maintaining manufacturability through established semiconductor processing techniques.
2Reliability
If high fiber count SM MPO connectors are manufactured using conventional molding, then the fiber count increases to meet data transfer demand, but the optical performance deteriorates seriously
Solution Approach 1:
The patent replaces polymer molding with microfabrication techniques to manufacture high fiber count SM MPO connectors. This substitution maintains excellent optical performance even at 24-fiber count by achieving sub-micron alignment precision through photolithography and electroplating, resolving the contradiction between fiber count and optical performance.
3Object-affected harmful factors
If physical contact connection method is used in MPO connectors, then the connection mechanism is simple, but the connectors become sensitive to dust and contaminants
Solution Approach 1:
The patent inverts the traditional physical contact connection mechanism by creating recessed fiber endfaces instead of protruding ones. This inversion allows the fiber endfaces to be protected within recesses, reducing sensitivity to dust and contaminants while maintaining connection functionality, thus resolving the contradiction between sensitivity to harmful factors and device complexity.
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 enables sub-micron fiber alignment precision, reduced insertion loss, and enhanced tolerance to dust and contaminants, achieving optical performance comparable to standard single-mode connectors with improved scalability and reproducibility for high-density fiber arrays.
Implementation Method 1
microfabricating a ferrule mold having a reverse-image of a through-hole array for optical fibers and guide holes
Implementation Method 2
material deposition, material removal, etching, and coating to create an optical component
Implementation Method 3
material deposition, material removal, etching, and coating to create an optical component
Implementation Method 4
applying an antireflection coating for improved optical performance
Data Source
AI summary
A ferrule mold having a reverse-image of a through-hole array for optical fibers is formed. A non-polymeric ferrule material is deposited in the reverse-image mold, followed by removing the mold to create a multi-fiber connector ferrule having at least two fiber through-holes. An optical fiber is inserted in each through-hole until each fiber endface is positioned approximately even with a connection surface of the ferrule. A fiber recess for each of the optical fibers is formed such that each fiber is recessed from the multi-fiber ferrule connection surface by a distance of at least 0.1 micron. The recess may be formed by differential polishing of the non-polymeric ferrule and endfaces of the optical fibers. Alternatively, a layer of spacer material may be deposited over the multi-fiber ferrule connection surface. An antireflection coating is deposited over the ends of the recessed fibers.