Next Article in Journal
Optical Imaging in Brainsmatics
Previous Article in Journal
Progress in Photonic-Crystal Surface-Emitting Lasers
Open AccessArticle

Analysis of Bending-Induced Degradation of Orbital Angular Momentum Modes in Optical Fibers

Department of Electrical and Computer Engineering, Ajou University, Suwon 16499, Korea
*
Author to whom correspondence should be addressed.
Photonics 2019, 6(3), 97; https://doi.org/10.3390/photonics6030097
Received: 26 July 2019 / Revised: 22 August 2019 / Accepted: 30 August 2019 / Published: 1 September 2019
In this work, bending-induced deterioration of orbital angular momentum (OAM) modes in ring core fiber (RCF), photonic crystal fiber (PCF), and vortex fiber (VF) was theoretically investigated: Bending losses, coupling losses, and intermodal crosstalk at the interface between straight and bent optical fibers were investigated from the modal analysis of those three types of OAM mode fibers. In addition, the degradation of a topological charge number of an OAM mode due to the bending-induced birefringence and horizontal mode asymmetry was also investigated. Our investigation revealed that, in all aspects, the PCF is most robust to bending among the three types of optical fibers, and the most serious bending-induced problem in the VF and the RCF is the degradation of the topological charge number. The allowed minimum bending radii of VF and RCF appeared to be ~15 and ~45 mm, respectively, for the specific structures considered in this work. We expect that the methodology and results of our quantitative analysis on bending-induced degradation of OAM modes will be of great use in the design of OAM mode fibers for practical use. View Full-Text
Keywords: orbital angular momentum (OAM), vortex fiber; ring core fiber; photonic crystal fiber; fiber bending effect; topological charge number orbital angular momentum (OAM), vortex fiber; ring core fiber; photonic crystal fiber; fiber bending effect; topological charge number
Show Figures

Figure 1

MDPI and ACS Style

Lee, I.J.; Song, J.; Kim, S. Analysis of Bending-Induced Degradation of Orbital Angular Momentum Modes in Optical Fibers. Photonics 2019, 6, 97.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop