RESEARCH OF THE EFFECT OF THE CHEMICAL COMPOSITION OF THE OPTICAL FIBER GLASS ON THE SIGNAL SPECIFIC CHROMATIC DISPERSION

Abstract

The dependences of the specific chromatic dispersion of the signal on the working wavelength of the optical signal were analyzed for stepped optical fibers of cores and shells of various chemical compositions. For the study, the selected wavelength range of the optical signal is 1,300 ... 1.595 μm, which are widely used at the present stage in fiber optic transmission systems. The influence of dopants (germanium oxide, boron oxide, phosphorus oxide) in the composition of the core and cladding of the optical fiber on the value of the specific chromatic signal dispersion has been established. The spectral dependences of the chromatic dispersion of the optical signal at different dopants concentrations were also obtained. Based on the obtained spectral dependences, the chemical composition of optical fibers was determined, which, by their value of the specific chromatic dispersion of the signal, satisfy the recommendations of ITU G.652, which corresponds to a standard single - mode optical fiber (SF). Based on the obtained research results, a method is presented for optimizing the dispersion characteristics of a stepped optical fiber by introducing dopants of a prescribed type and concentration into the composition of its core and shell. The results of the research are presented in tabular and graphical form.