研究目的
To fabricate ytterbium-doped graded refractive-index few-mode fiber (GRIN-FMF) using a vapor phase chelate delivery technique and evaluate its performance for optical amplification.
研究成果
The fabrication of graded-index active Yb-doped fibers through optimization of composition and associated fabrication parameters of the VPCD technique was successful, demonstrating excellent process repeatability and potential for optical amplification without distortion in temporal, spectral, and spatial profiles.
研究不足
The process complexity and repeatability challenges in achieving graded-index profile in active fiber with RE and Al ions distribution.
1：Experimental Design and Method Selection:
The MCVD-VPCD technique was adopted to fabricate large-core RE-doped performs with GRIN profile.
2：Sample Selection and Data Sources:
High purity silica tube (F-300 grade) and precursor salts for Yb and Al were used.
3：List of Experimental Equipment and Materials:
MCVD chelate delivery system, SiCl4, Yb(thd)3, AlCl3, helium as carrier gas.
4：Experimental Procedures and Operational Workflow:
Deposition of pure silica layers, core layers deposition with varying flow rates, collapsing of the tube to form the preform.
5：Data Analysis Methods:
Refractive index profiles (RIPs) measurement, SEM and EDAX analysis, EPMA for dopant ions distribution.
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