Photonic Chip Interferometer Phase Adjuster for Precision Optical Measurement
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Solution Overview
Problem
Current optical sensing technologies face challenges in accurately measuring small differences in refractive index, emission properties, thickness, and position due to limitations in sensitivity and precision.
Innovation Solution
An optical measuring device utilizing a photonic chip with an interferometer and phase adjusting unit to maximize interference between signals from two waveguides, allowing for sensitive detection of changes in optical properties by controlling the phase difference and minimizing output signal when the properties of the measurement regions match.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical sensing methods are used, then the device structure is simple, but the measurement precision of small optical differences is insufficient
Solution Approach 1:
The device is divided into distinct functional modules: a photonic chip containing an interferometer with multiple waveguides, a phase adjusting unit with independent control for each waveguide, and a detection unit. This segmentation allows precise control of optical paths while maintaining modular simplicity in the overall system architecture.
Solution Approach 2:
The interferometer acts as an intermediary device that converts small optical differences in the measurement region into measurable intensity variations through interference. The phase adjusting unit serves as another intermediary, enabling precise control of the interference condition to maximize sensitivity to small changes in refractive index, thickness, or position.
2Measurement precision
If phase adjusting unit is added to control interference, then the sensitivity to small optical differences is improved, but the device complexity increases
Solution Approach 1:
The phase adjusting unit enables dynamic control of the phase difference between waveguides, allowing the system to operate at optimal sensitivity points. By adjusting the phase parameter, the interferometer can be tuned to maximize the response to small changes in optical properties, thereby improving sensitivity without requiring complex mechanical structures.
Solution Approach 2:
The phase adjusting unit serves multiple functions: it controls the interference condition to maximize sensitivity, compensates for manufacturing variations in waveguide lengths, and enables the device to measure different types of optical differences (refractive index, thickness, position) using the same hardware platform.
3Measurement precision
If interferometer with multiple waveguides is used, then the detection precision of optical differences is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The phase adjusting unit provides a feedback mechanism that compensates for manufacturing variations. By measuring the actual interference pattern and adjusting the phase accordingly, the system can achieve optimal sensitivity even when waveguide lengths differ from design specifications, thereby reducing the stringency of manufacturing precision requirements.
Solution Approach 2:
The device transitions from a static interferometer with fixed path lengths to a dynamic system where the phase can be adjusted in real-time. This dynamic capability allows the system to adapt to manufacturing variations and maintain high detection precision 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
Enables precise measurement of small optical differences, achieving significant changes in output signal when the optical properties of the regions are matched, thereby enhancing sensitivity and accuracy in detecting refractive index, emission properties, and displacement.
Implementation Method 1
an interferometer defined on said chip, said interferometer comprising first and second waveguides on said photonic chip and an interference region, wherein the first and second waveguides carry signals from the interference region to the sample region and back to the interference region
Implementation Method 2
a phase adjusting unit configured to vary a phase difference between the signals in the first and second waveguides reflected by the measurement region
Data Source
AI summary
An optical measuring device for measuring a measurement region, the optical device comprising a photonic chip with an interferometer defined on said chip, said interferometer comprising first and second waveguides on said photonic chip and an interference region, wherein the first and second waveguides carry signals from the interference region to the sample region and back to the interference region, the device further comprising a phase adjusting unit configured to vary a phase difference between the signals in the first and second waveguides reflected by the measurement region.