Pluggable Optical Connector Multi-Stage Alignment Ferrule
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Solution Overview
Problem
Efficiently and cost-effectively aligning optics to couple light into and out of photonic integrated circuits (PICs) is challenging due to existing methods being slow and incompatible with conventional semiconductor packaging processes, leading to yield and throughput issues.
Innovation Solution
A connectorized optical cable with an optical plug featuring a ferrule and multi-stage alignment features, including coarse, intermediate, and fine alignment mechanisms, allows precise alignment with optical sockets, eliminating the need for low-yield coupling processes and providing robust connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional optical fiber attachment methods are used to couple light into and out of PICs, then optical coupling can be achieved, but the process is slow and results in substantial yield and throughput issues
Solution Approach 1:
The alignment process is divided into multiple stages: coarse alignment using the housing and alignment features, intermediate alignment using the ferrule holder, and fine alignment using the ferrule. This segmentation allows each stage to address specific alignment requirements, enabling rapid automated assembly while achieving sub-micron precision that ensures high yield.
Solution Approach 2:
The ferrule holder acts as an intermediary component between the housing and the ferrule, providing intermediate alignment features that guide the ferrule into proper position. This intermediary structure enables automated pick-and-place assembly by providing robust coarse alignment while allowing for subsequent fine alignment, thereby improving both speed and yield.
2Ease of manufacture
If conventional optical fiber attachment methods are used, then optical coupling can be achieved, but the process is incompatible with conventional semiconductor packaging processes
Solution Approach 1:
The optical assembly is segmented into discrete components (housing, ferrule holder, ferrule) with defined interfaces, allowing the optical plug to be manufactured separately and attached to the PIC using standard semiconductor packaging processes such as pick-and-place assembly, thereby achieving compatibility with conventional manufacturing lines.
Solution Approach 2:
The alignment features are designed to provide self-alignment during the packaging process, where the housing and ferrule holder automatically guide the optical components into correct positions without requiring complex external alignment equipment, enabling integration with high-volume semiconductor manufacturing.
3Manufacturing precision
If multi-stage alignment features are implemented for precise alignment, then sub-micron precision can be achieved, but device complexity increases
Solution Approach 1:
The alignment system is segmented into three hierarchical levels: coarse alignment (housing level), intermediate alignment (ferrule holder level), and fine alignment (ferrule level). Each level addresses a specific precision requirement, allowing sub-micron accuracy to be achieved through cumulative alignment rather than requiring a single complex alignment mechanism.
Solution Approach 2:
The ferrule is nested within the ferrule holder, which is in turn nested within the housing. This nested structure allows each component to provide alignment at its own level, with the inner components building upon the alignment established by outer components, achieving high precision while maintaining a compact overall structure.
Data Source
AI summary
Technologies for pluggable optical connectors are disclosed. In the illustrative embodiment, an optical plug includes a ferrule with one or more optical fibers. The optical plug also includes a ferrule holder that holds the ferrule and a housing that encloses the ferrule and ferrule holder. The ferrule holder can move relative to the house, and the ferrule can move relative to the ferrule holder and the housing. As the optical plug is plugged into a socket, alignment features in the housing coarsely align the ferrule. Intermediate alignment features in the ferrule holder then engage, aligning the ferrule more precisely. As the optical plug is fully plugged in, fine alignment features in the ferrule engage, precisely aligning the ferrule and the optical fibers with the optical socket.