Tunable Light Source Optical Fiber Alignment Interferometry
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Solution Overview
Problem
Existing optical fiber alignment systems for photonic devices are imprecise and labor-intensive, often obstructed by camera fixtures and require pre-adjustment of fiber positions, which hampers accurate alignment and testing.
Innovation Solution
A system utilizing a tunable light source, interferometer, and optical analysis processing circuit to project measurement and reference beams through optical fibers, detecting interference and generating control signals for precise alignment and performing FFT on beat signals to determine device characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camera is used for optical fiber alignment, then alignment can be performed, but the alignment precision is insufficient and fixtures occlude line of sight
Solution Approach 1:
The patent replaces camera-based optical alignment with an interferometric measurement system that uses light interference patterns to determine fiber positions and alignment status, eliminating the need for camera line of sight and achieving higher precision through wavelength-scale measurements
Solution Approach 2:
The patent introduces an interferometer as an intermediary measurement device that uses reference beams and measurement beams to indirectly detect fiber alignment status through interference patterns, bypassing the direct line of sight requirement of cameras
2Measurement precision
If a contact or proximity sensor is used for optical fiber alignment, then alignment can be performed, but pre-adjustment of relative positions is required which is labor intensive
Solution Approach 1:
The interferometric system automatically measures fiber positions and calculates alignment status without requiring manual pre-adjustment, with the processing circuitry autonomously determining when optimal alignment is achieved based on interference pattern analysis
Solution Approach 2:
The system provides real-time feedback through interference patterns that indicate alignment status, allowing automated adjustment mechanisms to iteratively optimize fiber positioning without manual intervention
3Manufacturing precision
If traditional alignment systems are used, then alignment can be performed, but the systems are imprecise and labor intensive
Solution Approach 1:
The patent replaces mechanical alignment methods with optical interferometry that achieves micrometer and sub-micrometer precision through wavelength-based measurements, dramatically improving both accuracy and automation capability
Solution Approach 2:
The system measures alignment status by detecting changes in optical path length and interference pattern parameters rather than direct mechanical position measurement, enabling higher precision through optical phase detection
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 precise alignment of optical fibers and effective testing of photonic devices by improving alignment accuracy and reducing labor intensity through automated adjustment and characterization of device characteristics.
Implementation Method 1
detect, via the detector, an interference beam from the second optical fiber based on the measurement beam
Data Source
AI summary
Systems and methods for alignment and testing of a photonic device include a light source, an interferometer, a detector, and a processing circuit. The processing circuit may generate control signal(s) for the light source to project a beam through the interferometer to a device under testing (DUT). The interferometer may receive an interference beam from an optical fiber of the DUT. The processing circuit may align optical fiber(s) for the DUT, determine one or more characteristics for the DUT, and so forth based on the interference beam and a reference beam generated by the interferometer.