Recessed Ferrule Optical Connector for Thermal Misalignment
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Solution Overview
Problem
High-bandwidth optical communication systems face challenges in maintaining proper alignment between chip-based transceiver devices and optical connectors due to thermal expansion mismatch, leading to fiber-to-waveguide misalignment and increased mating forces.
Innovation Solution
The design incorporates a ferrule body with a recessed optical interface and protruding optical fibers, minimizing contact between the ferrule body and the photonics circuit component, and optionally using a compliant material to distribute forces evenly, thereby reducing misalignment and contact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-bandwidth optical communication is implemented using silicon photonics, then data transfer speed increases, but thermal expansion mismatch causes fiber-to-waveguide misalignment
Solution Approach 1:
The ferrule body is segmented into distinct functional zones: a contact surface area that interfaces with the photonics circuit component substrate, and a recessed optical interface area that houses the optical fibers. This segmentation allows the contact surface to accommodate thermal expansion while the recessed optical interface maintains precise fiber positioning, resolving the alignment issue caused by thermal expansion mismatch during high-speed data transfer
Solution Approach 2:
A compliant material is introduced as an intermediary between the ferrule body and the photonics circuit component substrate. This compliant material absorbs thermal expansion differences and mechanical stresses, preventing direct stress transmission that would cause misalignment. The intermediary layer maintains optical alignment while accommodating thermal effects during high-bandwidth operation
2Reliability
If mating force is increased to maintain physical connection at elevated temperatures, then connection stability improves, but fiber-to-waveguide misalignment increases
Solution Approach 1:
The ferrule body applies localized contact through a specific contact surface area rather than distributed contact. This concentrated local contact provides stable mechanical connection and positioning at elevated temperatures, while the recessed optical interface isolates the optical fibers from thermal stresses, maintaining alignment precision without requiring excessive mating force
Solution Approach 2:
The recessed optical interface structure provides beforehand cushioning by creating a stress-absorbing geometry that protects the optical fiber-waveguide interface from thermal expansion forces. The recessed design allows the contact surface to deform under thermal stress while the optical interface remains protected, maintaining connection stability and alignment without excessive mating force
3Manufacturing precision
If the optical interface is recessed and fibers protrude, then misalignment is minimized, but device complexity increases
Solution Approach 1:
The ferrule body integrates multiple functions into a single component: mechanical support, alignment guidance, stress distribution, and optical interface housing. By merging these functions into one monolithic ferrule structure with integrated recessed optical interface, the design achieves precise alignment without requiring additional separate alignment mechanisms, thus limiting the increase in device complexity
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 minimizes fiber-to-waveguide misalignment and reduces the force required to maintain a physical connection, while maintaining low system costs and high data transfer speeds, even at elevated temperatures.
Implementation Method 1
Optical connectors and optical couplings for fiber-to-chip optical connections
Implementation Method 2
Due to the differences of the coefficient of thermal expansion (CTE) of the different materials of the components involved in the fiber-to-chip connection, the interface at the photonics circuit component may become distorted
Data Source
AI summary
Optical connectors and optical couplings for fiber-to-chip optical connections are disclosed. In one embodiment, an optical connector includes a ferrule body having a surface, an optical interface disposed within the surface. The optical interface is recessed with respect to the surface by an offset distance, and at least one fiber bore through the ferrule body and terminating at the optical interface. The optical connector further includes at least one optical fiber disposed within the at least one fiber bore such that the optical fiber protrudes beyond a surface of the optical interface. In another embodiment, a compliant material is disposed on a ferrule surface of a ferrule body such that one or more optical fibers pass through the compliant material and protrude beyond a surface of the compliant material. A clamp may also be provided to clamp the optical connector to a substrate.