Optical Component Stepped Surface Stress Isolation
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Solution Overview
Problem
Optical components in fiber optic communication networks face stress due to press fitting and thermal expansion, leading to changes in reflective index and birefringence, which affect signal quality and focus, and existing solutions are either impractical or costly.
Innovation Solution
The design of optical components with a raised optical surface and a stepped peripheral portion, along with a boundary portion, helps isolate the optical surface from stress, reducing mechanical and thermal stress through a configuration that provides axial and radial protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If press fitting is used to secure optical components to the holder, then the optical component is firmly mounted, but stress is applied to the optical surface altering its profile and affecting optical performance
Solution Approach 1:
The optical component is segmented into distinct functional zones: a stress-free optical surface region and a peripheral mounting region. The stepped configuration separates the optical active area from the mechanical mounting area, allowing independent optimization of each zone without mutual interference.
Solution Approach 2:
Different regions of the optical component have different structural properties. The central optical surface maintains a specific profile for optimal optical performance, while the peripheral portion has a different structure designed for stress distribution and mounting. This local differentiation allows the component to simultaneously achieve mounting firmness and surface precision.
2Manufacturing precision
If compliant adhesive materials are used to bond the optical component to the holder, then stress on the optical surface is reduced, but manufacturing cost and process complexity increase
Solution Approach 1:
The optical component's own structure serves the stress-reduction function that would otherwise require external adhesive materials. The stepped configuration and peripheral portion geometry inherently provide stress distribution and compliance, eliminating the need for separate compliant bonding agents and simplifying the manufacturing process.
Solution Approach 2:
The stress-management function is extracted from the bonding interface and integrated into the optical component's structure itself. By incorporating the stress-distribution geometry directly into the component, the solution removes the need for additional adhesive materials and complex bonding processes.
3Ease of manufacture
If the optical component material is made soft or deformable for press fitting, then mounting is easier, but the optical surface is more susceptible to stress-induced profile changes
Solution Approach 1:
The optical component is divided into a rigid central optical surface region that maintains profile stability and a more compliant peripheral mounting region that facilitates press fitting. This segmentation allows the component to be easier to mount while protecting the critical optical surface from deformation.
Solution Approach 2:
Different regions of the component have different mechanical properties optimized for their specific functions. The optical surface area maintains rigidity and shape stability for precise optical performance, while the peripheral portions have increased compliance for easier mounting. This local property differentiation resolves the contradiction between ease of manufacture and surface stability.
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 configuration effectively reduces stress on optical surfaces, maintaining signal quality and focus while being practical and cost-effective by distributing stress to other parts of the component, thus enhancing the performance and durability of optical components in fiber optic sub-assemblies.
Implementation Method 1
The stepped portion may be formed to raise the central optical surface above the peripheral portion... effectively reduces stress on optical surfaces... by distributing stress to other parts of the component
Implementation Method 2
The thermal energy causes the optical component to expand relative to the holder, resulting in compressive forces on the optical component due to differences in the coefficients of thermal expansion (CTE)
Data Source
AI summary
In at least one example, an optical component includes a central optical surface proximate an optical axis, a peripheral portion extending radially from the central optical surface, and a stepped portion between the central optical surface and the peripheral portion. The stepped portion may be formed to raise the central optical surface above the peripheral portion.