Heck Maximilian, Schwartz Georg, Krämer Ria G, Richter Daniel, Goebel Thorsten A, Matzdorf Christian, Tünnermann Andreas, Nolte Stefan
Opt Express. 2019 Feb 18;27(4):4292-4303. doi: 10.1364/OE.27.004292.
We report on the detailed investigation of the core to cladding mode coupling in femtosecond-written long period fiber gratings (LPFG). It is shown that the excitation of higher-order cladding modes with strong selectivity and high precision is possible. The coupling behavior of several gratings, as well as its dependence on the modified core cross-section, is determined theoretically and confirmed experimentally by its spectral response. The presented tool paves the way for a completely new class of tailored LPFGs for different fiber integrated devices.
我们报告了对飞秒写入长周期光纤光栅（LPFG）中纤芯到包层模式耦合的详细研究。结果表明，以高选择性和高精度激发高阶包层模式是可行的。通过理论确定了几种光栅的耦合行为及其对修改后的纤芯横截面的依赖性，并通过其光谱响应进行了实验验证。所提出的工具为用于不同光纤集成器件的全新一类定制LPFG开辟了道路。
