Ying HAN, Zheng-Ran LI, Wei-Zhen ZHU, Peng SONG, Fan-Di ZHOU, Qi-Hao YANG, Yan WANG, Lin GONG, Man YANG, Wei WANG, Lan-Tian HOU. Polarization-maintaining hollow core negative curvature fiber with an operating wavelength of 2.94 μm [J]. Journal of Infrared and Millimeter Waves, 2020, 39(6): 696
- Journal of Infrared and Millimeter Waves
- Vol. 39, Issue 6, 696 (2020)
Fig. 1. Polarization maintain hollow core negative curvature fiber end view
Fig. 2. （a）y -directional clad tube thickness t 1y and nested tube to the inner diameter of the tube maximum distance Z on the influence of HC-NCF PER ，（b）when t 1y /t 1x is 2.15 （t 1y is 1.60 μm）, Z is 11.76 μm, x and y direction polarization mode
Fig. 3. The effect of core diameter D core on polarization maintain HC-PCF （a） The confinement loss of the modes changes with D core, （b） PER and HOMER changes with D core, （c） Re（n eff） change with D core,（d） the mode-field coupling process
Fig. 4. The effect of the cladding tube diameter D tube on polarization maintain HC-NCF （a） the confinement loss of the mode changes with D tube, （b） Re（n eff） changes with D tube
Fig. 5. Coupling process of mode changing with D tube: When D tube=79.57 μm, （a） x-pol core mode， （b） Clad surface mode1; When D tube=91.14μm, （c） y-pol core mode， （d） Clad surface mode2
Fig. 6. Polarization maintain HC-NCF mode coupling process with wavelength change （a） effective refractive index, （b）coupling process of mode
Fig. 7. Polarization maintain HC-NCF transmission characteristics with wavelength change （a） Mode-limited loss changes with wavelength, （b） PER and HOMER change with wavelength, （c） Birefringence change with wavelength, （d） x-pol core mode（top） and high order mode（bottom）
Fig. 8. Bend loss of polarization-maintaining HC-NCF （a） the loss obtained by bend in the y direction, （b） the loss obtained by bend in the x direction
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