研究目的
To investigate the performance of Er3t/Yb3t-codoped double-clad fiber amplifiers with respect to the constraints associated with space applications, focusing on thermal effects, fiber length, coating thickness, and core radius changes.
研究成果
Thermal effects can significantly degrade amplifier performance, especially in shorter fibers and higher radiation doses. Thicker coatings mitigate temperature variations and improve uniformity, while larger core radii enhance gain but require careful management to avoid temperature-induced guiding issues. The model aids in optimizing amplifier design for space applications by considering thermal constraints.
研究不足
The study is theoretical and numerical, relying on models and assumptions; it does not include experimental validation. The model may not capture all real-world complexities, such as exact material behaviors under extreme conditions or interactions not accounted for in the equations.
1：Experimental Design and Method Selection:
A multiphysics numerical model based on spatial-dependent rate equations and 3-D non-homogeneous heat conduction equations is used. The model includes an iterative algorithm to account for thermo-optic effects on electromagnetic and thermal fields.
2：Sample Selection and Data Sources:
The study uses a silica-based Er3t/Yb3t-codoped double-clad fiber with phosphorus-doped core (15 mol% P2O5), silica inner cladding, and acrylate coating. Material parameters are taken from references, and radiation-induced attenuation data is based on measurements at room temperature.
3：List of Experimental Equipment and Materials:
No specific experimental equipment is mentioned as the study is theoretical and numerical; it relies on computational simulations.
4：Experimental Procedures and Operational Workflow:
The numerical code inputs system data (fiber properties, RIA, signal and pump powers), solves eigenvalue equations for guided modes, calculates heat load from pump and signal powers, solves thermal conduction equations using Hankel and Fourier transforms, updates refractive index and cross sections based on temperature, and iterates until gain difference is below a threshold.
5：Data Analysis Methods:
Analytical solutions for temperature distribution are derived using separation of variables and integral transform techniques. Gain and temperature profiles are analyzed parametrically with variations in fiber length, coating thickness, core radius, and radiation dose.
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