This paper is presented the simple analytical formula for calculating the nonlinear coupling coefficient between modes with arbitrary radial and azimuthal orders for multimode optical fiber. The solution is obtained by a well-known method of Gauss approximation. For example, the present work shows the spectral dependencies of nonlinear coupling coefficients for some low-order modes of optical fibers with step and parabolic refractive index profile.
In the presented article, the possibilities of calculating the parameters of the modes of optical fibers with depressed claddings by the Gauss approximation method are considered. Calculations are performed for samples of single-mode and few-mode optical fibers with depressed cladding. The calculation results are compared with the technical data of the samples under consideration.
The work presents an approximate solution for the mode coupling of a curved optical fiber. Formulas for calculating the mode coupling coefficients are obtained from the Gauss approximation method. As an example, the results of the calculation of the mode coupling coefficients of a curved optical fiber with a limited parabolic refractive index profile for the proposed formulas are given. Calculations have shown that even relatively small bends of an optical fiber result in a mode coupling between modes of different azimuthal order. At the same time, mode coupling of different azimuthal order increases with reduction of bend radius and mode coupling of the same azimuthal order practically does not depend on it.
The paper presents the simulation results for the long-haul two-mode fiber-optic link with managing of differential mode delay. Two compensation schemes were considered (by using mode crossing and by using delay lines). The options for using the inclusion of units for differential mode delay compensation in linear optical amplifiers in the case of compensation of chromatic dispersion only at the reception at the far end of the link and in the case of compensation of chromatic dispersion on linear optical amplifiers were considered. Also, the option of differential mode delay compensation on dense maps was considered when compensation units are set in closures of cable line on the amplifier section.
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