Optical Point Source Detection Using Fiber Delay Lines
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Solution Overview
Problem
Existing optical sensors require complex setups with multiple photodetectors and matching components to achieve high accuracy, making them expensive and difficult to calibrate for precise detection and location of optical point sources.
Innovation Solution
A system using a single photodetector circuit with multiple optical fibers that delay and combine incoming optical signals, allowing for serial processing to determine the relative position of optical sources, reducing the number of components and simplifying calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple photodetectors and matching components are used to achieve high accuracy in optical source detection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple optical signal paths into a single photodetector by using optical fiber delay lines to sequentially deliver signals from different spatial directions. Instead of using multiple photodetectors simultaneously, the system merges their functions into one detector through time-division multiplexing, thereby reducing component count while maintaining detection capability
Solution Approach 2:
The patent segments the optical detection process into multiple time-separated signal paths. Each optical fiber delay line corresponds to a specific spatial direction, and signals from different directions are separated in time rather than space. This allows a single photodetector to effectively perform the function of multiple detectors by processing signals sequentially
2Measurement precision
If multiple photodetectors and matching components are used to achieve high accuracy, then measurement precision is improved, but manufacturing and calibration difficulty increase
Solution Approach 1:
By merging multiple detection functions into a single photodetector, the patent eliminates the need for complex matching and calibration between multiple detectors. The single detector approach removes the requirement for impedance matching and gain balancing between multiple components, significantly simplifying the manufacturing and calibration process
Solution Approach 2:
The patent creates temporal copies of optical signals from different spatial directions through the delay lines. Each signal path is replicated in time rather than requiring physical duplication of photodetectors, which avoids the calibration complexity associated with matching multiple identical detector assemblies
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
This approach enables accurate detection and location of optical sources with fewer components, lower costs, and simplified calibration, while maintaining high performance by using a single photodetector and optical fibers to introduce time delays for signal processing.
Implementation Method 1
a first optical fiber... a second optical fiber
Implementation Method 2
provide the optical signal at a first output to a photodetector
Data Source
AI summary
A system for processing optical signals comprising a reference optical signal transmission structure configured to receive an optical signal at a first input and to provide the optical signal at a first output to a photodetector. A delay optical signal transmission structure configured to receive the optical signal at a second input and to provide a delayed optical signal at a second output to the photodetector. A signal processor configured to receive a first electric signal corresponding to the optical signal and a second electric signal corresponding to the delayed optical signal and to generate an output as a function of the first electric signal and the second electric signal.