Semiconductor Optical Amplifier Laser Diode System for High Peak Power Lidar
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Solution Overview
Problem
Current lidar systems face challenges in achieving high peak power pulses without the use of specialized optical amplifiers, which limits their effectiveness in distance measurement and ranging applications.
Innovation Solution
A semiconductor optical amplifier laser diode system is developed, comprising a laser diode to produce seed light, a capacitor for charging, a transistor to control current flow through the semiconductor optical amplifier, and a receiver to detect scattered light, enabling amplification of temporal portions of the seed light to produce high peak power pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If specialized optical amplifiers are used to achieve high peak power pulses, then the effectiveness in distance measurement is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces specialized optical amplifiers with a semiconductor optical amplifier (SOA) driven by a directly modulated laser diode. This substitution uses electrical control mechanisms instead of complex optical pumping systems, achieving high peak power pulses while reducing device complexity. The laser diode is modulated with drive current pulses to directly control the SOA gain and output pulse characteristics.
Solution Approach 2:
The patent achieves high peak power pulses by dynamically changing the drive current parameters applied to the laser diode. By adjusting the amplitude, width, and repetition frequency of the drive current pulses, the system optimizes the SOA output to generate high peak power light pulses without requiring specialized optical amplifier hardware.
2Speed
If the semiconductor optical amplifier is directly modulated with drive current, then the response speed is improved, but the peak power output may be limited
Solution Approach 1:
The patent employs periodic drive current pulses with optimized width and amplitude to modulate the laser diode and SOA. This periodic modulation allows the system to accumulate energy during the pulse duration and release it as high peak power output pulses, achieving both fast response and high peak power. The pulse repetition frequency is optimized to balance response speed and peak power generation.
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 allows for higher peak power pulses without the need for specialized optical amplifiers, enhancing the accuracy and range of lidar systems in distance measurement and ranging applications.
Implementation Method 1
a capacitor configured to charge from a voltage source
Implementation Method 2
a semiconductor optical amplifier configured to amplify at least a temporal portion of the seed light in response to the current flowing through the semiconductor optical amplifier
Implementation Method 3
a receiver configured to detect at least a portion of the output pulse of light scattered by a target object
Data Source
AI summary
A system includes a laser diode configured to produce seed light, a capacitor configured to charge from a voltage source, a transistor configured to control current flowing through a semiconductor optical amplifier via a controlled discharge of the capacitor, the semiconductor optical amplifier configured to amplify at least a temporal portion of the seed light in response to the current flowing through the semiconductor optical amplifier to emit an output pulse of light, and a receiver configured to detect at least a portion of the output pulse of light scattered by a target object located at a distance from the system.