Laser Radar Coupling Device Optical Fiber Crosstalk Reduction
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Solution Overview
Problem
Conventional laser radars face issues with signal light crosstalk and efficiency due to close detector subunit spacing and stray light, leading to optical and electrical signal interference.
Innovation Solution
A coupling device comprising an optical fiber and a coaxially arranged lens group between the light receiving lens and detector, which filters stray light and maximizes signal light coupling efficiency by collimating and converging the signal light, while electrical isolation between detector subunits further reduces crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detector subunits are arranged closely to increase detection density, then detection capability is improved, but optical crosstalk and electrical crosstalk increase
Solution Approach 1:
The patent introduces optical fibers as intermediary components between the light receiving lens and detector subunits. These optical fibers guide the optical signals while providing physical isolation, thereby maintaining close detector spacing for high detection capability while preventing optical crosstalk through the fiber's light-guiding properties and electrical isolation characteristics.
Solution Approach 2:
The patent divides the detection system into independent channels, with each detector subunit processed through separate optical fiber pathways. This segmentation isolates the optical and electrical signals between adjacent detectors, preventing crosstalk while allowing dense arrangement of detector elements for improved detection capability.
2Loss of energy
If optical fiber numerical aperture is increased to improve light coupling, then coupling efficiency is improved, but stray light filtering capability deteriorates
Solution Approach 1:
The patent optimizes the numerical aperture parameter of the optical fiber to achieve a balance between coupling efficiency and stray light rejection. By carefully selecting the numerical aperture value, the system maximizes signal light coupling while maintaining sufficient angular selectivity to filter out stray light, resolving the contradiction between these two requirements.
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
The solution enhances signal light coupling efficiency, reduces signal loss, and minimizes both optical and electrical crosstalk, thereby improving the signal-to-noise ratio and output quality in laser radars.
Implementation Method 1
the optical fiber in the coupling device for photoelectric conversion has a certain optical acceptance angle, so that it can act as a spatial filter to filter out part of stray light inside the laser radar
Implementation Method 2
the light receiving lens is configured to converge the signal light reflected by a target reflector
Implementation Method 3
the detector is configured to receive the signal light that passes through the lens group and perform photoelectric conversion on the received signal light
Data Source
AI summary
The present disclosure discloses a coupling device for photoelectric conversion and a laser radar. The device comprise a light receiving lens, a detector, and a coupling device provided between the light receiving lens and the detector, wherein the coupling device comprises an optical fiber and a lens group arranged coaxially with each other, the optical fiber is arranged near an end with the receiving lens, and the lens group is arranged near the other end with the detector; and the light receiving lens is configured to converge the signal light reflected by a target reflector and couple the converged signal light into an optical fiber, the lens group is configured to receive the signal light output from the optical fiber, and the detector is configured to receive the signal light that passes through the lens group and perform photoelectric conversion on the received signal light.