Polarization Maintaining Fiber Array Dummy Groove PER
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Solution Overview
Problem
Maintaining alignment of polarization maintaining fibers during the manufacturing process is challenging, leading to decreased polarization extinction ratio (PER) and rendering fiber arrays unsuitable for applications requiring high PER, typically 30 dB or greater in telecommunications and data centers.
Innovation Solution
Incorporating a substrate with main grooves and additional grooves for dummy fibers, which alleviates forces on the polarization maintaining fibers, ensuring proper alignment and increasing the PER by sharing applied forces with dummy fibers positioned in additional grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polarization maintaining fibers are assembled in a fiber array, then multiple fiber optic signals can be transmitted, but alignment difficulties cause decreased polarization extinction ratio
Solution Approach 1:
The patent introduces dummy fibers as intermediary elements that act as force distributors during the assembly process. These dummy fibers are positioned in additional grooves and serve as mediators to evenly distribute clamping forces from the cover, preventing direct stress concentration on the polarization-maintaining fibers that would cause misalignment and PER degradation.
Solution Approach 2:
The patent implements beforehand cushioning by pre-positioning dummy fibers in additional grooves before the final assembly step. These dummy fibers provide a cushioning effect that absorbs and distributes mechanical stresses during the clamping process, protecting the polarization-maintaining fibers from alignment-disrupting forces before they can cause damage.
2Stability of the object's composition
If clamping forces are applied to secure fibers in grooves, then fiber positioning is stabilized, but forces on polarization maintaining fibers cause misalignment and reduced PER
Solution Approach 1:
The dummy fibers function as counterweight elements that balance the clamping forces applied by the cover. By distributing these forces through multiple contact points including the dummy fibers, the system counteracts the harmful concentration of stress on any single polarization-maintaining fiber, maintaining both positioning stability and PER integrity.
3Reliability
If additional grooves with dummy fibers are added, then PER is increased, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the fiber array structure into distinct functional zones: main grooves for polarization-maintaining fibers and additional grooves for dummy fibers. This segmentation allows each zone to serve its specific purpose while maintaining overall system simplicity through modular, standardized groove designs that can be manufactured using conventional techniques.
Data Source
AI summary
A polarization maintaining fiber array includes a substrate, a cover, and at least two polarization maintaining optical fibers. The substrate includes at least two main grooves, a first additional groove, and a second additional groove, wherein the main grooves are positioned between the first additional groove and the second additional groove. The fiber array includes at least two polarization maintaining optical fibers positioned in the at least two main grooves, a first dummy fiber positioned in the first additional groove, and a second dummy fiber positioned in the second additional groove. The cover is positioned such that it contacts the polarization maintaining optical fibers, the first dummy fiber, and the second dummy fiber.