掺铒大模式面积单模光子晶体光纤放大器的数值分析

Simulation of erbium-doped K9-glass photonic crystal fiber amplifier with large mode area

根据平面波展开法(PWEM)给出泵浦光和信号光本征模场分布,结合速率方程和功率传输方程设计一种大单模尺寸的实芯掺铒K9玻璃大模式面积单模光子晶体光纤,芯径为20μm;分析其椭圆度容差为94.7%,最内层小孔最大允许偏移量为0.1μm;分析了掺铒K9玻璃光子晶体光纤放大器的放大特性.进行数值计算后得到当铒离子浓度(N_4)为1×10^(26)时,掺铒K9玻璃光纤放大器阈值为180 mW,最佳长度为0.26 m.

A large mode area core erbium doped K9-glass single-mode photonic crystal fiber is designed by getting the pump and signal intensity profiles from plane wave expansion method （PWEM） and solving propagation-rate equations. Its diameter is 20 μm, limit ellipticity error is 94.7%, and limit offset of inner ventage is 0.1 μm. Then we analyze its amplifier characteristics. From numerical analysis when concentration of the erbium ions （Nt） is 1 ×10^26, we get the threshold of this fiber amplifier is 180 mW, and the optimal length is 0.26 m.