Mechanism and characteristics of long period fiber gratings in simplified hollow-core photonic crystal fibers

作者：Wu Zhifang^*; Wang Zhi; Liu Yan Ge; Han Tingting; Li Shuo; Wei Huifeng

来源：Optics Express, 2011, 19(18): 17344-17349.

We demonstrate the fabrication of high-quality LPFGs in simplified hollow-core photonic crystal fibers, composed of a hollow hexagonal core and six crown-like air holes, using CO(2)-laser-irradiation method. Theoretical and experimental investigations indicate that the LPFGs are originated from the strong mode-coupling between the LP(01) and LP(11) core modes. And a dominant physical mechanism for the mode-coupling is experimentally confirmed to be the periodic microbends rather than the deformations of the cross-section or other common factors. In addition, the LPFGs are highly sensitive to strain and nearly insensitive to temperature, and are promising candidates for gas sensors and nonlinear optical devices.

• 出版日期2011-8-29
• 单位南开大学