Várallyay Z, Jasapara J C
FETI Ltd., Vasgolyóu. 2-4, H-1158 Budapest, Hungary.
Opt Express. 2009 Sep 28;17(20):17242-52. doi: 10.1364/OE.17.017242.
We compare the amplification of various modes in large mode area fibers when the pump is coupled into the fundamental core mode versus the standard cladding-pump scheme. Our simulations show that pumping in the LP(01) core mode results in differential gain for the fundamental signal mode which suppresses the higher order modes and amplified spontaneous emission compared to the cladding pump scheme. This differential gain effect is predicted to increase with core size and may provide a path to scale fiber mode area to several thousand square micron.
我们比较了泵浦光耦合到基模纤芯模式时与标准包层泵浦方案相比，大模场面积光纤中各种模式的放大情况。我们的模拟结果表明，与包层泵浦方案相比，以LP(01)纤芯模式进行泵浦会导致基模信号模式的差分增益，从而抑制高阶模式和放大的自发辐射。预计这种差分增益效应会随着纤芯尺寸的增加而增强，并且可能为将光纤模场面积扩展到数千平方微米提供一条途径。
