Polarization-Maintaining Fiber Alignment Using Self-Illuminating Imaging
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Solution Overview
Problem
Existing fiber alignment systems for polarization maintaining fibers lack efficient methods to align the polarization axis, particularly for splicing and bonding with optical elements, requiring costly and complex illumination setups.
Innovation Solution
An optical fiber alignment system utilizing a rotation stage, image sensor, and oblique light source to identify and align the stress rods and core of polarization maintaining fibers, allowing for precise alignment without complex illumination setups, with methods to iteratively adjust rotational and translational offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex illumination setups are used to align polarization maintaining fibers, then alignment precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and utilizes the fiber's own emitted light (fluorescence or scattered light) as the illumination source, eliminating the need for external complex illumination setups. The fiber itself provides the light needed for alignment imaging, simplifying the overall system while maintaining alignment precision.
Solution Approach 2:
The fiber performs self-illumination by emitting light that can be detected by the image sensor. This self-service approach allows the fiber to provide its own illumination for alignment purposes, removing the need for separate illumination components and reducing system complexity.
2Manufacturing precision
If traditional alignment methods are used, then alignment can be achieved, but the process is time-consuming and less efficient
Solution Approach 1:
The system captures images of the fiber using the emitted light and processes these images to determine the orientation of stress rods or core features. This feedback loop allows for rapid iterative adjustment and refinement of alignment, significantly reducing alignment time while maintaining high accuracy.
Solution Approach 2:
The fiber emits light that can be immediately captured and processed to determine alignment parameters before the actual splicing or bonding operation. This preliminary alignment determination enables faster setup and reduces the time required for the overall alignment process.
3Reliability
If precise alignment of polarization axis is performed, then polarization state is maintained, but the alignment process becomes more complex
Solution Approach 1:
The patent utilizes optical properties such as fluorescence emission or light scattering characteristics that are inherent to the fiber's polarization-maintaining structure. By detecting these optical responses, the system can identify the polarization axis orientation without requiring complex mechanical or optical alignment systems.
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 accurate alignment of polarization maintaining fibers with external bodies, maintaining polarization state through wide tolerance ranges and compatibility with various fiber types, reducing the need for costly setups and enhancing alignment precision.
Implementation Method 1
a light source positioned to emit light onto the optical fiber channel at an oblique angle from the central axis of the rotation stage
Implementation Method 2
an image sensor positioned adjacent to the second end of the rotation stage. The image sensor may be positioned to generate an image of an emission face of an optical fiber disposed within the optical fiber channel
Data Source
AI summary
A method of aligning an optical fiber includes placing an optical fiber onto a rotation stage, securing the optical fiber on the rotation stage, illuminating the optical fiber on the rotation stage, and collecting an initial image of an emission face of the optical fiber. The method also includes calculating a rotational offset of the optical fiber based on the initial image, and rotating the optical fiber on the rotation stage if the rotational offset of the optical fiber is not within a tolerance. The method further includes iteratively collecting at least one more additional image of the emission face of the optical fiber and releasing the optical fiber if the rotational offset of the optical fiber is within the tolerance.