Investigation of Total Energy Density and Power Flow for Propagating Modes of Square-Core Optical Fiber

Square-core optical fiber is one of the modern optical fibers used in many fields such as astronomical spectroscopy, laser cutting and thermal applications of lasers and beam shaping optics. In this paper, an optical fiber that has a square core with a side of 55 micro;m is designed for propagating laser light at a wavelength of 1060 nm. Then, using numerical analysis by finite element method (FEM), the distribution of electric and magnetic fields with different polarizations and magnetizations is analyzed for the first three propagating modes of the optical fiber. In the following, the changes of total energy density and power flow are investigated. Finally, the results of the figures and plots are discussed completely.