MOPA Optical Bench Architecture for Laser Power and Complexity
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Solution Overview
Problem
Current laser systems, particularly Master Oscillator Power Amplifiers (MOPAs), face complexity and high costs due to numerous optical components and nonlinear effects from fiber-guided amplification, limiting their scalability and affordability for applications like LIDAR and CATV amplifiers.
Innovation Solution
The implementation of a laser system with shared optical components and light sources across multiple fiber gain sections, utilizing doped fiber or crystal gain media, and incorporating free-space optical modules to reduce unnecessary fiber propagation and nonlinear effects, allowing for multi-stage amplification with reduced component count and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple optical amplifiers are used to achieve desired laser power levels, then the laser power is improved, but the number of optical components and system complexity increases
Solution Approach 1:
The patent combines multiple optical amplifiers into a single integrated optical amplifier unit with a shared pump light source. The pump light source is optically coupled to multiple gain sections through a wavelength division multiplexer, allowing one pump source to serve multiple amplification stages simultaneously. This merging approach achieves the desired laser power output while reducing the total number of discrete optical components and simplifying the overall system architecture.
Solution Approach 2:
The pump light source performs multiple functions by simultaneously pumping multiple gain sections through different wavelengths. The wavelength division multiplexer enables a single pump source to distribute light at different wavelengths to different gain sections, making the pump source universal for multiple amplification functions rather than requiring separate dedicated pump sources for each amplifier.
2Power
If fiber-guided amplification is used to amplify laser light, then the laser power is improved, but nonlinear effects and signal degradation increase
Solution Approach 1:
The patent segments the optical amplification process into multiple distinct gain sections, each with its own characteristics. By dividing the amplification into separate stages with different gain media and configurations, the system can manage and control nonlinear effects in each segment individually rather than having them accumulate in a single long fiber, thereby reducing overall signal degradation.
3Power
If multiple optical amplifiers with separate pump sources are used, then the amplification gain is improved, but the cost and component count increase
Solution Approach 1:
The patent merges multiple pump sources into a single shared pump light source that optically pumps multiple gain sections. The wavelength division multiplexer enables this shared pump source to deliver appropriate wavelengths to each gain section, achieving the amplification gain of multiple separate amplifiers while using only one physical pump source, thereby reducing the component count and system cost.
Solution Approach 2:
The single pump light source is designed to be universal, capable of providing pump light at multiple wavelengths simultaneously to different gain sections. This multi-functional pump source replaces what would traditionally require multiple dedicated pump sources, reducing both the quantity of components and the overall system cost while maintaining the required amplification gain.
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 efficient, cost-effective, and high-gain optical amplification, suitable for large-scale production, with reduced nonlinear signal degradation and component complexity, making it suitable for applications like LIDAR and CATV amplifiers.
Implementation Method 1
a doped gain fiber section between the first and second fiber terminals to convert energy of the pump laser light into energy of the seed laser light to produce amplified seed laser light
Implementation Method 2
an optical reflector located to reflect light at the seed laser wavelength back to the doped gain fiber section to be amplified for a second time as a reflected amplified seed laser light beam while transmitting light at the pump laser light wavelength
Implementation Method 3
a first free-space optical module on the support base and located to receive both the seed laser light from the seed laser and the pump laser light from the pump light source to produce a combined laser beam that combines the received pump laser light and the seed laser light
Data Source
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AI summary
An optical system allows sharing of optical components and seed and pump light to achieve desired optical amplification in laser light while reducing the number of optical components and complexity of the overall optical system and achieving improved performance in lasers and reduced cost in fabrication and final lasers for large scale production of such lasers. Different optical gain sections can be used to allow for sharing of seed and pump light and sharing of optical components while providing multi-stage optical amplification.