Calculation of the Coupling Coefficient of Twin-Core Fiber Based on the Supermode Theory with Finite Element Method
Open Access
- 1 January 2021
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Optics and Photonics Journal
- Vol. 11 (08), 402-411
- https://doi.org/10.4236/opj.2021.118029
Abstract
Currently, coupled mode theory (CMT) is widely used for calculating the coupling coefficient of twin-core fibers (TCFs) that are used in a broad range of important applications. This approach is highly accurate for scenarios with weak coupling between the cores but shows significant errors in the strong coupling scenarios, necessitating the use of a more accurate method for coupling coefficient calculations. Therefore, in this work, we calculate the coupling coefficients of TCFs using the supermode theory with finite element method (FEM) that has higher accuracy than CMT, particularly for the strong coupling TCF. To investigate the origin of the differences between the results obtained by these two methods, the modal field distributions of the supermodes of TCF are simulated and analyzed in detail.Keywords
This publication has 21 references indexed in Scilit:
- A Compact Millimeter-Wave Patch Quadrature Coupler With a Wide Range of Coupling CoefficientsIEEE Microwave and Wireless Components Letters, 2016
- Design of Thermally Poled Twin-Core Fiber Coupler With Electrical TunabilityIEEE Photonics Technology Letters, 2015
- Analytical Formulation of Supermodes in Multicore Fibers With Hexagonally Distributed CoresIEEE Photonics Journal, 2015
- Miniaturized broadband three-section symmetrical directional coupler with reduced coupling coefficient requirementsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2013
- Mode coupling dynamics and communication strategies for multi-core fiber systemsOptics Express, 2012
- Influence of Cores’ Shape on Coupling Length of Dual-core FiberPublished by Optica Publishing Group ,2009
- Coupled mode theoryPublished by Elsevier BV ,2006
- Polarization-Dependent Coupling in Twin-Core Photonic Crystal FibersJournal of Lightwave Technology, 2004
- Study of polarization-dependent coupling in optical waveguide directional couplers by the effective-index method with built-in perturbation correctionJournal of Lightwave Technology, 2002
- Polarisation beam splitting using twin-elliptic-core optical fibresElectronics Letters, 1990