Reflow-Compatible Optical Fiber Alignment Using V-Grooves and Retainer Lid
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Solution Overview
Problem
Conventional optical fiber attachment methods face challenges in maintaining precise alignment due to temperature-induced misalignment during the solder reflow process, leading to signal loss and increased manufacturing costs.
Innovation Solution
The use of V-shaped grooves etched into a substrate to guide and secure optical fibers, combined with a lid to center and hold them in place, and a reflow process with specific solder compositions to accommodate high-volume manufacturing without disturbing the fiber alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If epoxy-based attachment methods are used to hold optical fibers, then fiber alignment can be achieved, but the epoxy may cause misalignment when exposed to temperatures near or above its glass transition temperature during solder reflow
Solution Approach 1:
The patent introduces a intermediary structure consisting of a through-hole and a retainer ring that physically holds the optical fiber in place during the solder reflow process. This intermediary mechanism prevents direct thermal exposure of the fiber to the epoxy material, allowing the epoxy to cure without causing misalignment. The retainer ring acts as a mediator between the fiber and the substrate, maintaining fiber position stability throughout the thermal process.
Solution Approach 2:
The attachment system is segmented into distinct functional components: a through-hole for fiber passage, a retainer ring for fiber securing, and epoxy material for substrate bonding. This segmentation allows each component to perform its specific function independently - the retainer ring maintains fiber alignment while the epoxy provides structural attachment, eliminating the conflict between fiber holding and thermal exposure.
2Reliability
If lenses and other optics are used to expand the beam during coupling, then signal loss can be compensated for, but manufacturing cost increases and uniform signal loss occurs
Solution Approach 1:
The patent extracts and eliminates the need for additional optical components (lenses) by implementing a direct fiber-to-substrate attachment method. The through-hole and retainer ring structure enables the optical fiber to be directly coupled with the substrate without requiring beam expansion optics, thereby reducing manufacturing complexity and cost while maintaining signal transmission reliability through precise mechanical alignment.
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 method ensures precise alignment and secure attachment of optical fibers, reducing signal loss and manufacturing costs by maintaining fiber alignment through high-precision placement and suitable thermal management.
Implementation Method 1
V-shaped grooves etched into a substrate to guide and secure optical fibers
Implementation Method 2
a lid to center and hold them in place
Implementation Method 3
reflow process with specific solder compositions to accommodate high-volume manufacturing
Data Source
AI summary
In various embodiments, optical fibers may be placed into V-shaped grooves in a substrate. A lid may then be placed on top of the optical fibers to hold them accurately in place, and the lid may be attached to the substrate using a reflow solder technique. Epoxy may then be applied as a strain relief. Because the V-shaped grooves and optical waveguides are manufactured with precision on the same substrate, precise alignment between these two may be achieved. Because the epoxy is applied after reflow, the epoxy may not be exposed to reflow temperatures, which might otherwise cause the epoxy to distort during the cure process.