International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A group of numerical methods suitable for describing the propagation of light in a Photonic Crystal Fiber (PCF) are discussed. PCFs can be classified according to the mechanism of light propagation. The methodology of the analysis is briefly reviewed to understand how changing the different physical parameters of the fiber and the design affects its optical properties. By analyzing the systematic studies presented, a design with the desired optical fiber properties can be realized.
PCFs can be made from just one material with two-dimensional photonic crystals or periodic arrays of air holes parallel to the fiber axis to form a shell and core shape. Several types of PCFs have been considered. The mechanism for trapping light in the fiber core is explained. The use of the wave methods for electromagnetic field analysis is discussed. The application of variation principles and weighted residual methods is shown. The advantages of the finite element method (FEM) are indicated. The vector FEM for obtaining the modes in photonic crystal fibers is considered.

The Arm Microcontroller Learning Kit is built with the STMicroelectronics STM32H750VB microcontroller. The device is a small development system based on an Arm Cortex-M7 microcontroller. It has a modern modular design. The kit includes the most necessary peripherals to illustrate the capabilities of the microcontroller and it also supports a large amount of external peripherals. The cost of the kit is low due to the built-in periphery and the small number of additional external elements. The software uses a small fraction of the libraries provided by the microcontroller manufacturer and can be upgraded. This makes the device suitable for learning an ARM family of microcontrollers by beginners and advanced students.