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高功率非对称泵浦耦合器是高功率连续光纤激光器的关键无源光器件,它可以将多路泵浦光高效率地耦合进主光纤中,从而为光纤激光器提供所需的泵浦光功率,但已有双波导耦合理论并不能直接应用于该型耦合器的研究。为解决这一问题,在双波导定向耦合器的不完全耦合理论基础上,针对高功率泵浦耦合器非对称的特点,将其耦合系数和光功率方程组做了进一步推导,并进行了数值仿真,研究结果表明:两光纤中的光功率按照一定周期变化,当泵浦光纤的锥角在1°~1.5°之间时,可以获得97%以上的最佳耦合效率,且与其对应耦合长度的局部变化对耦合效率的影响较小。该研究结果对高功率非对称泵浦耦合器的设计及制作均具有指导意义。
High Power Asymmetric Pump Coupler is a key passive optical device for high power continuous fiber lasers that efficiently couple multiple pump beams into the main fiber to provide the required pump power for fiber lasers However, the dual-waveguide coupling theory has not been directly applied to the research of the coupler. In order to solve this problem, based on the incomplete coupling theory of dual-waveguide directional coupler, the coupling coefficient and optical power equations of the high-power pump coupler are further deduced according to the asymmetry of the high-power pump coupler. The numerical simulation The results show that the optical power in the two fibers changes with a certain period. When the taper angle of the pump fiber is between 1 ° and 1.5 °, the optimal coupling efficiency of more than 97% can be obtained, and the corresponding coupling length The effect of local changes on the coupling efficiency is small. The results of this study are instructive for the design and fabrication of high power asymmetric pump couplers.