POLARIZATION MODE DISPERSION COMPENSATOR BASED ON ANISOTROPIC OPTICAL FIBER

Abstract

Abstract. In this paper, a new method of polarization mode dispersion (PMD), which can
significantly limit the speed and range of transmission of fiber optic transmission systems (FOTS),
compensation was developed and analyzed. In contrast to the existing types of PMD compensators, in
which the optical fiber is subjected to mechanical stresses to create a photoelastic anisotropy, in this work
the use of alternative method of creating photoelasticity in optical fiber (OF) by creating a helical ordered
rotation of the glass microstructure (ORMG) is proposed. The helical orientation of the microstructure of
the OF glass is achieved by acting on the fiber in the process of manufacture (drawing), when it is in a hot
state, electromagnetic field, the power lines of which are directed in a circle. I am not sure what this
sentence is trying to say. The result is an asymmetry of the dielectric constant of the fiber glass material
and therefore the anisotropy of the optical properties. When the optical signal propagates in such OF,
there is a double refraction, which is the cause of artificial PMD in the compensator fiber. Compensation
is achieved by performing the equality of the modulus and the sign-opposite between the linear path PMD
and the PMD of the anisotropic OF with the ORMG. The expression of the calculation of the PMD of the
compensator, which depends on the rotation step of the microstructure of the glass, the chemical
composition of the OF, the length of the line, the width of the radiation spectrum and the wavelength of
the optical signal, and the optical characteristics of the OF, is analyzed, as well as the spectral
dependence of polarization mode dispersion for different chemical compositions of the OF. The
expression of determining the length of the OF with the ORMG is presented to compensate for the set
value of the PMD in the line. The results of the studies made it possible to determine the lengths of the
segments of OF with ORMG, which will provide partial or complete compensation of PMD over a wide
range of wavelengths and create passive compensators for dispersion.