Numerical investigation of dual guided elliptical ring core few-mode fiber for space division multiplexing applications

Abstract

In this article, dual elliptical ring core few-mode fiber (DE-RCF-FMF) profile with assisting dual cladding is investigated. By this approach, it is possible to combine the performance behavior two separate ring core fiber (RCF). Of course, elliptically core region is constructed for polarization maintaining properties. In this way, the maximum number of linearly polarized (LP) modes up to 20 can be generated. As dual channel separation, inner elliptical core region generates maximum of 8 L P modes and identified as LP01, LP11a, LP11b, LP21 for both X - and Y- polarizations. Similarly, outer elliptical core is supposed to generate maximum of 12 L P modes and identified as LP01, LP11, LP11, LP21, LP31, LP41, and LP51 for both x- and y- polarizations. Using finite element method (FEM), each mode characteristics is numerically simulated and the performance studies are compared with other LP modes. It is obviously well known as mode converter property and the conversion is only possible due to the mutual energy sharing between the neighborhood modes. In this design, LP01 mode is converted to LP11 and LP11 converted as LP21. The conversion region may happen for either ellipticity or wavelength variation. Anyhow, the property of mode conversion in the transverse direction is also considered as essential property of Space division multiplexing techniques.