Integrated Seed and Pump Source for Dual-Wavelength Fiber Amplifiers
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Solution Overview
Problem
Conventional high power laser systems require separate pump sources for each gain medium and discard reflected pump energy, leading to inefficiencies and increased complexity due to additional components and space requirements.
Innovation Solution
An integrated seed and high power pump source system utilizing a pump power oscillator with a leaky high reflector fiber Bragg grating and a partially reflective fiber Bragg grating, where pump wavelength radiation is propagated in both forward and reverse directions to efficiently pump a seed pre-amplifier and seed power amplifier within a single medium, allowing for dual wavelength amplification without explicit separate pump sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate pump sources are used for each gain medium, then each medium can be pumped effectively, but system complexity and space requirements increase
Solution Approach 1:
The patent combines multiple pump sources into a single integrated pump source that can pump multiple gain mediums simultaneously. The single pump source generates pump radiation that is distributed to both the first and second gain mediums through optical coupling, eliminating the need for separate pump sources and reducing system complexity while maintaining effective pumping of each medium
Solution Approach 2:
The single pump source is designed to perform multiple functions by pumping both the first and second gain mediums. The pump source generates pump radiation at wavelengths that can be absorbed by both gain mediums, and the system configuration allows the same pump source to serve multiple pumping purposes simultaneously
2Device complexity
If reflected pump energy is discarded, then the system is simpler to design, but energy efficiency decreases
Solution Approach 1:
The patent recovers reflected pump energy that would otherwise be discarded by redirecting it through optical components back into the gain mediums. The system captures backward-propagating pump radiation and reroutes it to continue pumping the gain mediums, thereby recovering energy that would have been lost and improving overall energy efficiency
Solution Approach 2:
The system implements feedback by capturing reflected pump energy and feeding it back into the gain mediums for additional pumping. The optical configuration creates a feedback loop where pump radiation that reflects backward is redirected and reused, ensuring that the energy is not wasted but rather循环利用 to enhance pumping efficiency
3Device complexity
If a single pump source is used for multiple gain mediums, then system complexity and space requirements are reduced, but achieving effective pumping of all mediums becomes more difficult
Solution Approach 1:
The patent applies local quality by optimizing the pump radiation distribution to each specific gain medium based on its unique absorption characteristics. The system uses wavelength-selective optical components and tailored coupling configurations to deliver appropriate pump wavelengths to each medium, ensuring that each gain medium receives pump radiation optimized for its specific pumping 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
This configuration enables compact, efficient amplification of dual wavelengths within a single gain aperture, reducing system complexity and size while maximizing energy utilization by leveraging the absorption and emission properties of rare earth doped fibers, such as thulium and holmium in silica fibers.
Implementation Method 1
a leaky high reflector fiber Bragg grating (FBG)... propagates a minor portion of pump wavelength (λp) radiation in the reverse direction through the leaky high reflector fiber Bragg grating (FBG)
Implementation Method 2
a partially reflective FBG... propagates a major portion of pump wavelength (λp) radiation in the forward direction through the partially reflective FBG
Implementation Method 3
a pump power oscillator comprising a first medium having a pump wavelength (λp)... the first medium is thulium-doped silica fiber
Implementation Method 4
the pump wavelength (λp) lies in a spectrally overlapped region of the first medium and the second medium, such that there is significant gain in the first medium and significant absorption in the second medium
Implementation Method 5
a seed pre-amplifier comprising a second medium having a seed wavelength (λs)... the second medium is holmium-doped silica fiber
Implementation Method 6
the pump wavelength (λp) lies in a spectrally overlapped region of the first medium and the second medium, such that there is significant gain in the first medium and significant absorption in the second medium
Data Source
AI summary
The system and method of integrated seed and high power pump source generates two wavelengths outside the effective gain bandwidth of a single gain medium without using two unique pump sources in a fiber amplifier train. The system and method uses a single pump power oscillator that passes a seed wavelength with no loss and minimal amplification to pump integrated amplifiers in both directions (forward and backward) resulting in amplification of the seed wavelength.