Pluggable Optical Connector Alignment Features
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Solution Overview
Problem
High-speed optical transceivers face challenges in assembly precision and throughput due to the manual and cumbersome process of attaching fiber arrays to photonic integrated circuits using adhesives, leading to low yield and increased costs from handling and transporting fragile optical fibers.
Innovation Solution
The integration of pluggable optical connectors with interfacial alignment features, utilizing laser machining to create precise mechanical alignment features in a glass interposer and ferrule, allowing for temporary and repeatable connections, and enabling sub-micron precision alignment without permanent fiber tails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adhesive attachment is used to attach fiber array to PIC, then permanent connection is achieved, but assembly precision and throughput deteriorate
Solution Approach 1:
The connection system is divided into separate components: a pluggable connector assembly that can be attached and detached from the PIC without permanent adhesive bonding. This allows the fiber array to be connected through a mechanical interface that maintains reliability while enabling high-speed assembly and disassembly operations.
Solution Approach 2:
The connector system transitions from a static permanent adhesive bond to a dynamic pluggable connection that can be rapidly assembled and disassembled. The mechanical interface enables repeatable connections with consistent alignment, providing both reliability and high productivity.
2Reliability
If manual adhesive attachment is used to attach fiber array to PIC, then permanent connection is achieved, but manufacturing precision deteriorates
Solution Approach 1:
Alignment features such as alignment pins, grooves, or keyed interfaces are pre-formed on the connector components before assembly. These features guide the fiber array into precise alignment with the PIC during the connection process, eliminating the need for manual alignment while maintaining permanent connection reliability.
Solution Approach 2:
The connector system incorporates self-aligning mechanical features that automatically position the fiber array relative to the PIC during insertion. The geometry of the alignment features ensures that proper alignment is achieved without requiring skilled manual intervention or complex external alignment equipment.
3Reliability
If permanent adhesive attachment is used, then fiber array is permanently attached, but handling and transportation costs increase
Solution Approach 1:
The system separates the permanent PIC component from the pluggable connector assembly containing the fiber array. This segmentation allows the fiber array to be protected within the connector housing during handling and transportation, while the connector can be easily attached to or removed from the PIC as needed, reducing damage risks and handling costs.
4Productivity
If pluggable connector with alignment features is used, then assembly throughput is enhanced, but device complexity increases
Solution Approach 1:
Multiple alignment and connection functions are merged into a single integrated pluggable connector assembly. The alignment features (pins, grooves, or keyed interfaces) and the fiber array attachment mechanism are combined in one component that performs both alignment and connection simultaneously, reducing the number of separate parts and assembly steps despite the increased functionality.
Data Source
AI summary
Optical connectors with alignment features, and methods of forming the same, are disclosed herein. In one example, an optical ferrule includes holes to couple a fiber array to the optical ferrule, a mating protrusion to mate with an optical receptacle, and alignment features to align the fiber array with optical waveguides in the optical receptacle. The optical receptacle includes the optical waveguides, a mating cavity to mate with the mating protrusion on the optical ferrule, and alignment features to mate with the alignment features on the optical ferrule.