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Title: Ring-core fiber with negative curvature structure supporting orbital angular momentum modes
Authors: Tu, JJ
Liu, ZY 
Gao, SC
Wang, Z 
Zhang, JB 
Zhang, B
Li, JP
Liu, WP
Tam, H 
Li, ZH
Yu, CY 
Lu, C 
Issue Date: 2019
Source: Optics express, 22 July 2019, v. 27, no. 15, p. 20358-20372
Abstract: Compared 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.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.27.020358
Rights: © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
© 2019 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Journal © 2019
The 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
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