Mechanical FAU Couplers for Detachable Sub-Micron Fiber Alignment
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Solution Overview
Problem
Current methods for manufacturing optical connectors in silicon photonics (SiP) devices face challenges in accurately aligning light signals between SiP devices and optical fibers, leading to inefficiencies and increased complexity due to the use of active alignment and adhesive bonding, which are costly and limit interchangeability.
Innovation Solution
The development of mechanical couplers for fiber array units (FAUs) that utilize v-grooves or u-grooves for fiber and substrate couplers, allowing for detachable and precise alignment of optical fibers with optical elements, enabling interchangeable connections using a detachable mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active alignment and adhesive bonding methods are used for manufacturing optical connectors, then alignment accuracy between SiP devices and optical fibers can be achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The optical connector is divided into separate modular components: a fiber array unit (FAU) with fiber couplers and a receptacle with optical element couplers. These modules can be manufactured independently using standard silicon photonics processes, then assembled through mechanical coupling. This segmentation eliminates the need for complex active alignment during final assembly, as each module is pre-aligned and bonded internally using conventional adhesive bonding techniques.
Solution Approach 2:
Mechanical couplers serve as intermediary structures that facilitate precise alignment between the FAU and receptacle. The couplers include alignment features such as V-grooves or U-grooves that mechanically guide and position the optical fibers and optical elements relative to each other, achieving sub-micron alignment accuracy without requiring active alignment equipment during assembly.
2Manufacturing precision
If adhesive bonding is used to permanently bond optical fibers, then alignment accuracy is maintained, but interchangeability and servicing capability are limited
Solution Approach 1:
The connector design transitions from a static permanent bond to a dynamic reconfigurable system. The mechanical couplers enable the FAU and receptacle to be repeatedly connected and disconnected while maintaining alignment accuracy. The coupling mechanism includes features that guide precise positioning during each connection, allowing the system to adapt to multiple assembly cycles without degradation of alignment performance.
Solution Approach 2:
By segmenting the connector into separable modules (FAU and receptacle) with standardized mechanical interfaces, the design enables easy replacement and servicing. Each module can be independently manufactured, tested, and replaced without affecting the other components, significantly improving maintenance capability while preserving alignment accuracy through the standardized mechanical coupling interface.
3Ease of manufacture
If traditional manufacturing methods are used for optical connectors, then production processes are established, but production time and costs are increased
Solution Approach 1:
The FAU and receptacle modules are pre-manufactured using standard silicon photonics fabrication processes, including pre-alignment and pre-bonding of optical fibers to the FAU substrate and optical elements to the receptacle substrate. This preliminary preparation allows the final assembly to be a simple mechanical coupling operation, dramatically reducing production time while utilizing established manufacturing processes for the individual modules.
Solution Approach 2:
The invention combines multiple functions into integrated modules: the FAU integrates multiple optical fibers with their coupling structures, and the receptacle integrates the optical element array with its mounting features. This modular integration allows parallel manufacturing of multiple components that can be quickly assembled together, improving overall productivity compared to traditional sequential assembly methods.
Data Source
AI summary
Some embodiments of the present disclosure are directed to mechanical couplers for fiber array units (FAUs) and methods of manufacturing the same. For example, an optical connector for an optical device may include an FAU and a receptacle positioned on the optical device. The FAU may include a plurality of fiber couplers (e.g., v-grooves, u-grooves, and/or the like) into which optical fibers (e.g., single mode fibers) may be positioned and held in place (e.g., using an adhesive). The FAU may be formed from a substrate, and the fiber couplers may be formed in a surface of the substrate. The FAU may also include substrate mechanical couplers (e.g., additional v-grooves, u-grooves, and/or the like) formed in the surface of the substrate adjacent the fiber couplers and extending substantially parallel to the fiber couplers on the surface of the substrate.