Self-Aligned Fiber Optical Devices via Micro-Fabricated Trenches
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Solution Overview
Problem
Current fiber optical devices require laborious active alignment methods, which are costly and prone to precision issues, limiting their application and efficiency in optoelectronic systems.
Innovation Solution
A passive optical alignment platform using micro-fabricated trenches with self-aligned springs on a silicon base, eliminating the need for lenses and coatings, allowing for robust and cost-effective fiber-to-fiber coupling without compromising optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active alignment methods with collimators are used, then optical coupling precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the complex collimator assembly (lens, coating, polishing components) from the fiber coupling system. By removing these unnecessary components and using direct fiber-to-fiber coupling through V-grooves, the system achieves simplified structure while maintaining coupling precision through passive mechanical alignment
Solution Approach 2:
The V-groove structure provides self-aligning capability where fibers automatically position themselves through the V-shaped geometry. The spring-loaded mechanism further enables self-adjustment to compensate for dimensional variations, eliminating the need for complex active alignment systems and skilled operator intervention
2Ease of manufacture
If V-groove passive alignment is used, then manufacturing cost is reduced, but alignment stability deteriorates
Solution Approach 1:
The patent incorporates spring-loaded mechanisms that preemptively compensate for potential alignment issues. The springs provide continuous contact force to maintain fiber positioning against the V-groove walls, cushioning against dimensional variations, thermal expansion, and mechanical perturbations before they can cause misalignment
Solution Approach 2:
The system uses adjustable spring pressure and V-groove geometry parameters to optimize the balance between mechanical stability and alignment precision. By tuning these parameters, the system maintains stable alignment across different operating conditions while keeping the structure simple and cost-effective
3Reliability
If deep trenches with springs are used, then alignment robustness is improved, but device complexity increases
Solution Approach 1:
The patent merges the alignment function and the mechanical support function into a single integrated V-groove structure. The V-groove simultaneously provides geometric alignment guidance and mechanical support, while the springs provide both positioning force and compensation for dimensional variations, reducing the need for separate alignment and support components
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
Enables low-cost, high-reproducibility fiber optical devices with reduced insertion loss and increased bandwidth, suitable for automated production and broadening the application of fiber-fiber optical devices.
Implementation Method 1
a flexible spring plate 12 and a straight wall 14 defining a trench 20 between them. As a fiber 16 is inserted into the trench 20, the spring plate 12 pushes the fiber 16 into contact with the wall 14
Data Source
AI summary
A passive self-alignment fiber-to-fiber optical device is provided. The device includes a silicon base, a fiber alignment region, and an actuation region. When the device is configured as a fiber optical attenuator, displacement of a plunger in the actuation region alters the alignment of two optical fibers in the fiber alignment region, thereby varying the optical intensity between the two fibers. A series of beams in the actuation region successively reduces an initial displacement of a first beam to a smaller displacement of the plunger. When the device is configured as an optical switch, displacement of the plunger in the actuation region displaces the first optical fiber from a first position in alignment with the second optical fiber into a second position in alignment with a third optical fiber.