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http://dx.doi.org/10.3807/COPP.2018.2.3.233

Two-mode Fiber with a Reduced Mode Overlap for Uncoupled Mode-division Multiplexing in C+L Band  

Hong, Seongjin (Physics and Applied Physics, Yonsei University)
Choi, Kyoungyeon (Department of Mechanical Engineering, Seoul National University)
Lee, Yong Soo (Physics and Applied Physics, Yonsei University)
Oh, Kyunghwan (Physics and Applied Physics, Yonsei University)
Publication Information
Current Optics and Photonics / v.2, no.3, 2018 , pp. 233-240 More about this Journal
Abstract
We proposed a two-mode fiber (TMF) design that can effectively reduce the mode overlap between $LP_{01}$ and $LP_{11}$ modes by using a W-shaped index profile core structure, which is a primary concern in uncoupled mode division multiplexing (MDM). TMF has a three-layered core structure; central circular core, inner cladding, and outer ring core. We confirmed that in an optimal structure the $LP_{01}$ mode was highly confined to the central core while the $LP_{11}$ mode was guided along the outer ring core to result in a minimum overlap integral. We used a full-vectorial finite element method to estimate effective index, differential group delay (DGD), confinement loss, chromatic dispersion, and mode overlap controlling the parameters of the W-shaped structure. The optimized W-profile fiber provided optical characteristics within the ITU-T recommended standards over the entire C+L band.
Keywords
Optical fiber communication; Mode-division multiplexing; Two-mode fiber;
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