Ferrule Assemblies With Laser-Etched Alignment Features
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Solution Overview
Problem
Current optical connector technologies face challenges in precisely aligning and coupling a large number of optical fibers due to the need for sub-micron accuracy and high precision, which is beyond the capability of existing manufacturing processes, especially for connectors with 96 or more fibers, and requires unachievable precision and high axial forces for successful mating.
Innovation Solution
The development of a ferrule assembly with a lens array substrate and a fiber array ferrule that uses a laser damage and etch process to create precise alignment features, such as holes and lenses, and combines this with coarse singulation methods to reduce processing time and cost, allowing for accurate alignment and coupling of optical fibers with reduced complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precision injection molded hole arrays are used to hold a large number of fibers (96 or more), then fiber positioning capability is improved, but manufacturing precision deteriorates because position errors smaller than 1 μm are beyond the capability of current connector molding processes
Solution Approach 1:
The connector is divided into separate components: a ferrule body with molded holes and a fiber array ferrule with precision holes. The fiber array ferrule is further segmented into multiple substrates that can be separately fabricated and then assembled, allowing each component to be optimized independently for its specific function.
Solution Approach 2:
A fiber array ferrule acts as an intermediary component between the ferrule body and the optical fibers. This ferrule contains precision holes formed by laser processing rather than molding, serving as a mediator that achieves the required sub-micron positioning accuracy that cannot be obtained through injection molding alone.
2Productivity
If the number of fibers in a connector is increased to 96 or more, then bandwidth and transmission capacity are improved, but device complexity increases making precise alignment and positive contact unachievable with current designs
Solution Approach 1:
The large fiber array is segmented into multiple substrates (e.g., 4 substrates for 96 fibers), each containing a manageable number of fibers. This segmentation reduces the complexity of handling and aligning the entire array at once, as each substrate can be processed and aligned independently.
Solution Approach 2:
The alignment problem is solved by adding alignment features that extend beyond the simple hole array plane. Alignment features are formed on the surfaces of the substrates and ferrule body, creating additional dimensional references for precise positioning that simplify the alignment process for high fiber-count connectors.
3Manufacturing precision
If sub-micron accuracy fiber protrusion is maintained across a large fiber array, then optical coupling precision is improved, but manufacturing capability deteriorates as this precision is beyond the reach of present connector design and manufacturing
Solution Approach 1:
The traditional mechanical injection molding process for creating precision holes is replaced with laser processing. The laser forms precision holes and alignment features directly on the ferrule substrates, achieving sub-micron accuracy that is impossible with conventional molding, while simplifying the manufacturing process.
Solution Approach 2:
The manufacturing approach changes from mechanical molding to laser-based processing. By changing the fundamental parameter of how holes are formed (from mechanical injection to laser ablation/etching), the system achieves the required precision while improving ease of manufacture for high fiber-count connectors.
4Reliability
If unacceptably high axial forces are applied to accommodate fiber array errors, then positive contact between fiber pairs is achieved, but device complexity and risk of damage increase
Solution Approach 1:
Alignment features are pre-formed on the ferrule substrates and ferrule body during manufacturing, establishing precise alignment references before the fibers are inserted or mated. This preliminary alignment action prevents the need for high forces during the mating operation, as the alignment is already established.
Solution Approach 2:
The alignment features act as intermediaries that mediate the alignment between mating connectors. These features (formed by laser processing) provide precise mechanical references that guide the mating process, eliminating the need for high axial forces to accommodate alignment errors.
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
This solution enables the precise and cost-effective alignment of high fiber count optical connectors, reducing processing time by up to 50% and achieving accurate optical coupling with minimized laser-formed feature length and surface area, thus addressing the challenges of precision and cost associated with existing methods.
Implementation Method 1
fabricated by a laser process
Implementation Method 2
laser damage and etch process to create precise alignment features
Data Source
AI summary
Ferrule assemblies having a lens array are disclosed. In one embodiment, a ferrule assembly includes a ferrule body and a fiber array ferrule. The ferrule body includes a first end face and a second end face, at least one cavity for receiving one or more optical fibers disposed between the first end face and the second end face, and at least one body alignment feature at an outer surface of the body. The fiber array ferrule includes a first end face and a second end face, an array of alignment holes extending between the first end face and the second end face, and at least one ferrule alignment feature at an outer perimeter of the fiber array ferrule. The second end face of the fiber array ferrule is coupled to the first end face of the body.