光纤放大器侧向多点抽运耦合的研究

在微棱镜侧面抽运耦合的基础上提出利用缠绕光纤的方法，将光纤进行并排缠绕到一跑道型的物体上，利用微棱镜将抽运光进行侧面多处抽运耦合进入光纤，利用粒子数速率方程和信号光及抽运光的传输方程进行了相关的数值模拟，分别讨论了在端面抽运和侧面抽运两种方式下，各处抽运功率相同和总抽运功率相同时增益随光纤长度变化的情况，发现多点耦合的确能够有效地提高信号光的增益。讨论了弯曲损耗和过剩抽运光对信号光增益的影响，结果表明光纤的弯曲半径不要太小以致于产生太多的损耗从而导致增益降低，而剩余的抽运光可忽略不计。这种方法不仅为微棱镜的制造和实验操作带来了方便，而且有效地提高了光纤放大器信号光的输出增益。

Research on Fiber Amplifier of Many Position Side Pump Coupling

In this paper, based on the micro-prism coupling of side pump, the fiber is wound into a coil around a object of racetrack shape to make the micro-prism couple the pump light in many positions. Based on population rate equation, pump and signal propagation equation, a numerical simulation has been done. In the case of end pump and side pump, pump power of different position is same and the hole pump power is same, the fiber gain change with the fiber length has been discussed. It is found that the side pump coupling in many positions increases the fiber gain. The influence of the bending loss and the residual pump power on the fiber gain has been discussed too, the result showed that the fiber bending can′t be too small and the residual pump power can be neglected. In this way, it can not only offer a simple way to design the micro prism and operate conveniently, but increase the signal output gain effectively.