Demountable Optical Connector Preload for Stable PIC Alignment
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Solution Overview
Problem
Existing demountable optical connectors for photonic integrated circuits (PICs) face challenges in achieving consistent and reliable alignment due to inadequate preload mechanisms, leading to instability and increased insertion loss under external forces and environmental factors.
Innovation Solution
The invention introduces a demountable optical connector with improved preload features, utilizing kinematic coupling and passive mechanical alignment through geometric features such as coupling balls and V-grooves, along with a spring-based external bias to maintain precise alignment and stability, minimizing thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If demountable optical connectors are used for PICs, then ease of operation and reconfigurability are improved, but alignment stability and reliability deteriorate due to inadequate preload mechanisms
Solution Approach 1:
The preload mechanism applies preliminary force to maintain constant contact pressure between the optical connector and foundation before external forces are applied. This pre-compression ensures that alignment features remain engaged and stable during subsequent operation, connection, or disconnection cycles.
Solution Approach 2:
The spring-based preload mechanism dynamically adjusts the contact force parameter to maintain optimal alignment pressure. By changing the mechanical parameter of contact force, the system ensures reliable alignment while allowing easy demountable operation.
2Reliability
If preload mechanisms are added to maintain alignment stability, then reliability is improved, but device complexity increases
Solution Approach 1:
The spring-based preload mechanism is self-regulating and automatically maintains appropriate contact force without external control systems. The spring inherently provides the necessary preload and compensates for thermal expansion or contraction, eliminating the need for complex active control mechanisms.
Solution Approach 2:
The patent replaces complex active alignment systems with a simple passive mechanical preload mechanism. Instead of using motors, sensors, or electronic control systems, the invention uses a spring-based mechanical system to achieve reliable alignment stability.
3Manufacturing precision
If stringent alignment tolerances are enforced for single-mode optical connections, then optical coupling efficiency is improved, but manufacturing precision requirements and cost increase
Solution Approach 1:
The preload mechanism provides beforehand cushioning by maintaining constant contact force that compensates for manufacturing tolerances and thermal variations. This allows the system to operate within relaxed manufacturing tolerances while achieving the same optical coupling efficiency as tighter tolerances would provide.
Solution Approach 2:
The invention changes the operational parameter from rigid fixed-position alignment to dynamic force-maintained alignment. By using the spring-based preload to maintain optimal contact force, the system achieves high optical coupling efficiency without requiring extremely tight manufacturing tolerances.
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
The solution ensures consistent and reliable optical alignment with reduced insertion loss, improved manufacturability, and enhanced stability under thermal and mechanical stress, while maintaining low manufacturing costs.
Implementation Method 1
a spring-based external bias to maintain precise alignment and stability
Data Source
AI summary
Attaching an optical connector to an optoelectronic device via a foundation thereon is achieved by kinematic coupling, quasi-kinematic coupling, or elastic-averaging coupling. The foundation is attached to the optoelectronic device with reference to optical ports in the optoelectronic device. For kinematic coupling, coupling balls and grooves are provided on facing surfaces of the optical connector and the foundation. An optical bench of the optical connector is positioned in a central space on the foundation. A preload is applied along a line through the thermal center of the coupled foundation and optical connector without introducing lateral bias, ensuring the contact between the foundation and optical connector.