Polarization-maintaining hollow core negative curvature fiber with an operating wavelength of 2.94 μm
Received:May 12, 2020  Revised:November 23, 2020  download
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Author NameAffiliationE-mail
HAN Ying The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China hanyingysu@163.com 
LI Zheng-Ran The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China 18716020067@163.com 
ZHU Wei-Zhen The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
SONG Peng School of Physics and Technology University of Jinan Jinan 250022 China  
ZHOU Fan-Di The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
YANG Qi-Hao The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
WANG Yan The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
GONG Lin The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
YANG Man The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
WANG Wei The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
HOU Lan-Tian The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province Institute of Information Science and Technology Yanshan University Qinhuangdao 066004 China  
Abstract:A polarization-maintaining hollow-core negative curvature fiber is proposed, which can be used to transmit mid-infrared laser with an operating wavelength of 2.94 μm. By adjusting the thickness of the cladding tube in the y-direction and the maximum distance from the nested tube to the inner diameter of the cladding tube, the polarization mode in the y-direction is weakly coupled with the surface mode of the cladding tube. By optimizing the core diameter and the outer diameter of the cladding tube, the y-direction polarization mode is strongly coupled with the cladding tube surface mode, causing the y-direction polarization mode to leak out of the core. The gap between the cladding tubes guides the high-order mode to leak out of the core, while the x-direction polarization mode keeps the low confinement loss due to the coupling suppression effect of the thickness of the cladding tube and the nested tube. Finally, a polarization-maintaining hollow core negative curvature fiber with an operating wavelength of 2.94 μm is obtained. The confinement loss of the x-direction polarization mode is 2.8×10-2 dB/m, the polarization extinction ratio is greater than 2×103, the high-order mode rejection ratio is greater than 100, and the birefringence is1.4×10-5. When bending in the y direction with a radius of 25 cm, the bend loss is 0.62 dB/m.
keywords:mid-infrared laser  hollow core  polarization maintaining  negative curvature fiber
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Copyright:《Journal of Infrared And Millimeter Waves》