Fiber-Free Photodiode Detection With Split Laser Beam Alignment
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Solution Overview
Problem
Conventional photodiode testing systems using optical fibers suffer from instability in laser light transmission due to fiber bending, leading to reduced measurement accuracy and limited detection efficiency, as they can only detect a single photodiode at a time and are restricted to specific wavelength ranges.
Innovation Solution
An optical detection system employing a laser light providing module without optical fibers, which uses a laser chip package structure, an optical lens, and a beam quantity adjuster to generate a larger light spot that can be split into multiple beams for simultaneous detection of multiple photodiodes across various wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical fiber is used to transmit laser light to the photodiode, then the laser light can be delivered to the photodiode, but the stability of the laser light source is affected by the bending curvature of the optical fiber, resulting in poor energy stability and reduced measurement accuracy
Solution Approach 1:
The patent removes the optical fiber from the system entirely. The laser light source is positioned directly above the photodiode array without optical fiber transmission, eliminating the bending curvature issues that cause instability. The laser chip package structure includes a laser light source that directly emits light onto the photodiodes through a simple optical path without requiring optical fibers for light transmission.
2Productivity
If a laser generator with optical fiber is used, then the laser light source can be transmitted, but the spot size of the laser beam becomes concentrated and cannot be split, allowing detection of only a single photodiode at a time
Solution Approach 1:
The patent uses a beam splitting device to divide the single laser beam into multiple projection beams, each directed at a different photodiode. This allows simultaneous detection of multiple photodiodes (e.g., 9 photodiodes arranged in a 3x3 array) using a single laser light source, dramatically improving detection efficiency and productivity.
Solution Approach 2:
The laser chip package structure is designed to work with multiple photodiodes simultaneously through the beam splitting mechanism. A single laser light source serves multiple functions by providing light to multiple photodiodes at once, making the system versatile for detecting different wavelengths and multiple devices concurrently.
3Adaptability or versatility
If optical fiber is used for laser transmission, then the system is compact, but the system is restricted to specific wavelength ranges and cannot detect photodiodes in different wavelength ranges
Solution Approach 1:
The patent employs multiple laser chip package structures, each with different laser light sources that emit at different wavelengths. This allows the system to detect photodiodes across various wavelength ranges (e.g., different infrared wavelengths) using the same direct-coupling architecture, providing wavelength versatility without requiring complex optical fiber arrangements.
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 solution enhances measurement accuracy and detection efficiency by stabilizing the laser light source and enabling the simultaneous detection of multiple photodiodes, improving alignment accuracy and expanding the system's applicability across different wavelength ranges.
Implementation Method 1
The laser chip package structure is configured for generating a laser light source
Implementation Method 2
the first optical lens is configured for converting the laser light source into a laser beam
Implementation Method 3
the beam quantity adjuster is configured for splitting the laser beam into a plurality of projection beams
Implementation Method 4
a photodiode (PD) is an electronic component that can be used to receive a light source and then convert the received light source into an output electrical signal
Data Source
AI summary
An optical detection system and a laser providing module without using an optical fiber thereof are provided. The optical detection system includes a carrier module, a laser light providing module, and an electrical detection module. The carrier module is configured to carry a plurality of photodiodes. The laser light providing module is disposed above the carrier module. The electrical detection module is adjacent to the carrier module. The laser light providing module is configured to convert a laser light source into a plurality of laser light beams, thereby simultaneously and respectively exciting two corresponding ones of the photodiodes. The electrical detection module is configured to simultaneously and electrically contact the corresponding photodiodes so as to obtain an electrical signal generated by each of the photodiodes.