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dc.contributor.authorTu, JJen_US
dc.contributor.authorLiu, ZYen_US
dc.contributor.authorGao, SCen_US
dc.contributor.authorWang, Zen_US
dc.contributor.authorZhang, JBen_US
dc.contributor.authorZhang, Ben_US
dc.contributor.authorLi, JPen_US
dc.contributor.authorLiu, WPen_US
dc.contributor.authorTam, Hen_US
dc.contributor.authorLi, ZHen_US
dc.contributor.authorYu, CYen_US
dc.contributor.authorLu, Cen_US
dc.identifier.citationOptics express, 22 July 2019, v. 27, no. 15, p. 20358-20372en_US
dc.description.abstractCompared to glass walls with a positive curvature, those with a negative curvature have been proven to have stronger confinement of light. Therefore, we change the multi-layered air holes in a photonic crystal fiber into several negative curvature tubes. As a result, the confinement medium is shifted from a low-index cladding material into a special structure. The theoretical analysis shows that each vector eigenmode has a corresponding threshold value for the outer tube thickness. It means that we can confine the target modes and filter the unnecessary modes by shifting the outer tube thickness. After substantial investigation on this fiber, we obtain the appropriate values for each structural parameter and then fabricate this negative curvature ring-core fiber under the guidance of the simulation results. Firstly, we draw the central cane under vacuum condition, then stack the cane and six capillaries to form the preform, and finally draw the ring-core fiber by using vacuumization method. The fiber test experiment indicates that the fiber length should be at least 15 m similar to 20 m to form the donut facula, and the tested losses of OAM(+1,1), OAM (+2,1), OAM(+3,1), and OAM(+4,1) are 0.30 dB/m, 0.36 dB/m, 0.37 dB/m, and 0.42 dB/m, respectively.en_US
dc.description.sponsorshipDepartment of Electrical Engineeringen_US
dc.description.sponsorshipDepartment of Electronic and Information Engineeringen_US
dc.description.sponsorshipChinese Mainland Affairs Officeen_US
dc.publisherOptical Society of Americaen_US
dc.relation.ispartofOptics expressen_US
dc.rights© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
dc.rightsJournal © 2019en_US
dc.rightsThe following publication J. Tu, Z. Liu, S. Gao, Z. Wang, J. Zhang, B. Zhang, J. Li, W. Liu, H. Tam, Z. Li, C. Yu, and C. Lu, "Ring-core fiber with negative curvature structure supporting orbital angular momentum modes," Opt. Express 27, 20358-20372 (2019) is available at
dc.titleRing-core fiber with negative curvature structure supporting orbital angular momentum modesen_US
dc.typeJournal/Magazine Articleen_US
dc.description.validate201909 bcrc-
Appears in Collections:Journal/Magazine Article
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