合肥工业大学电子科学与应用物理学院光学工程系, 安徽 合肥 230601
设计了一种具有偏振滤波特性和保偏特性的空芯负曲率光纤 (HC-NCF), 并对其特性进行了分析。通过引入内包层管破坏常规 HC-NCF 的对称性, 使两个正交方向的基模和内包层玻璃管模式进行耦合, 从而增加两个偏振方向的折射率和损耗差异。进而对光纤双折射特性和损耗的影响因素进行分析, 包括内包层管的壁厚、内包层管的内直径和纤芯直径。结果表明, 当光纤纤芯直径和外包层管环内直径为 30 μm, 外包层和内包层管环壁厚分别为 1.116 μm 和 1.56 μm, 内包层管的内直径为 9 μm 时, 在 1.55 μm 波长处双折射达到 1.33×10-4，基模 x 偏振和 y 偏振方向的偏振消光比达到 4723 (36.7 dB)，并且偏振消光比大于 100 的带宽为 7 nm。 此外, 1.55 μm 波长处的最低损耗约为 0.03 dB/m。这种保偏 HC-NCF 可应用于对偏振敏感的光纤器件。
物理光学 负曲率光纤 双折射 限制损耗 偏振滤波 physical optics negative curvature fibers birefringence confinement loss polarization filter
Author Affiliations
Abstract
1 Department of Optical Engineering, School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230601, China
2 School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei 230009, China
3 R&D Center of High Power Laser Components, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4 Research Center for Advanced Photon Technology, Toyota Technological Institute, Nagoya 468-8511, Japan
Brillouin gain spectra (BGS) in an As2Se3 photonic crystal fiber (PCF) are investigated numerically. The profiles of the BGS are simulated by calculating the characteristics of different-order optical and acoustic waves in the PCFs with different core diameters. For the small-core PCF, there are two peaks in BGS, but there is only one peak for the large-core PCF. We also reveal that in the small-core PCF, the difference of Brillouin frequency shift between the LP01 and LP11 modes is obvious, while it is not obvious in the large-core PCF. The Brillouin threshold increases with the core diameter increasing.
stimulated Brillouin scattering optical mode acoustic mode chalcogenide fiber photonic crystal fiber Chinese Optics Letters
2020, 18(1): 010602
