In this article the mechanism of spreading of optical radiation in a Bragg fiber is considered. A mathematical model for analysis of a Bragg fiber viewed as a flat multilayered dielectric structure has been proposed. The method of geometrical optics of description of spreading the light is used. Formulas connecting the clad refractive index with fiber parameters are given. The light attenuation at its refraction in the multilayered clad and chromatic dispersion are calculated, as well as the dielectric loss of the clad material. The dispersion and the width of the waveband of Bragg fibers with different number of layers and low waveguide modes have been compared. Examples of fibers with different coefficient of dielectric material loss are included.
Author: Zhejnov Z.
DOMINANT TECHNOLOGIES IN “INDUSTRY 4.0”
A structure of a multifunctional hardware – software system for sensing and control of remote objects in the household and in the industry are considered. A version of data transferring between control center and controlled object using GPRS service is proposed. The monitoring and control are realized by a set of remote stations which control the objects and receive parameters from them. Every station has a microcontroller and GSM – GPRS modem with SIM card. The stations are linked to the switching server. Data received from remote stations are kept in the server. The server distributes information and sends control commands. Personal computers of the control center are connected in a local network. They receive data from WEB sites and send commands to the switching server. The design and the characteristics of two realized systems for remote monitoring and control are described.