Ao Xianyu, Her Tsing-Hua, Casperson Lee W
Department of Physics and Optical Science, Center for Optoelectronics and Optical Communications, The University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223, USA.
Opt Express. 2009 Dec 7;17(25):22666-72. doi: 10.1364/OE.17.022666.
We theoretically analyze gain guiding in large-core Bragg fibers, to be used for large-mode-area laser amplifiers with single-transverse-mode operation. The signal is gain-guided in a low-index core, whereas the pump is guided by the photonic bandgap of the Bragg cladding to achieve good confinement. The high-index layers in the Bragg cladding are half-wave thick at the signal wavelength in order to eliminate Bragg reflection, reducing the Bragg fiber effectively to a step-index fiber for gain guiding.
我们从理论上分析了大芯径布拉格光纤中的增益导引，这种光纤将用于单横模运行的大模面积激光放大器。信号在低折射率纤芯中实现增益导引，而泵浦光则由布拉格包层的光子带隙导引，以实现良好的限制。布拉格包层中的高折射率层在信号波长处为半波厚，以便消除布拉格反射，从而有效地将布拉格光纤简化为用于增益导引的阶跃折射率光纤。
