Analysis of Schemes for the Implementation of Long-Span Communication Lines Based on Fiber-Optic Amplifiers with Remote Pumping

Relevance. The organization of long-span fiber-optic communication lines (for example, DWDM) using traditional erbium amplifiers requires their placement in populated areas for the purpose of power supply and routine maintenance. This affects the increase in the length of sections, the number of amplification points and the accumulation of noise, which leads to an increase in the cost of the network and the need to install regenerators. An alternative is Remote Booster Pumping (ROPA) technology. However, its implementation requires addressing the issues of maximum pumping power, its effect on the information signal in different modulation formats, and the optimal length of the amplification section. Research in this area needs in-depth analysis and verification. Research in this area requires in-depth analysis and verification of previously obtained results by other scientists.

The purpose of the work is to analyze schemes for building long-span communication lines based on ROPA amplifiers in order to systematize and expand theoretical aspects in the field of research, determine the parameters of the pump signal and the optimal configuration of the line.

The methods of system analysis, analytical review of literature, generalization, as well as analytical calculation of pumping power and length of the amplification section are applied in the work.

Result. It is shown that a 350 km long line with two ROPA amplifiers requires a 2-Watt pumping source using a dedicated ITU-T G.652B fiber. For a 500 km section, it is recommended to use ITU-T G.652B and ITU-T G.654E fibers, as well as hybrid amplifiers (Raman and erbium) at the ends of the line, with the transmission of an information signal and a pump signal over a single fiber. It is noted that such a concept can cause nonlinear distortions that require additional research.

The scientific novelty lies in the comparative analysis of two remote pumping schemes and in the hypothesis of an increase in nonlinear effects and errors during the joint transmission of a powerful pumping signal and an information signal over a single fiber.

Practical significance. The results can be applied in the design of DWDM backbone networks with a length of up to 500 km for telecommunications and energy companies.

Theoretical significance. The work systematizes and summarizes knowledge in the field of remote EDF fiber pumping, allowing a more accurate assessment of the limits and prospects of the technology.

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