Few-mode fiber intra-modal nonlinear compensation method, device, equipment and medium

By obtaining the perturbation coefficient and performing perturbation calculations, the problem of high-dimensional nonlinear damage compensation in few-mode optical fibers was solved, and pre-compensation at the transmitting end was achieved, which improved transmission stability and communication performance and made the fiber suitable for high-dimensional application scenarios with multiple modes coexisting.

CN122372089APending Publication Date: 2026-07-10PENG CHENG LAB
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
PENG CHENG LAB
Filing Date
2026-04-13
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively address the problem of nonlinear impairment compensation in high-dimensional multi-space channels of few-mode fibers. Traditional compensation techniques are complex or reduce spectral utilization, making them unsuitable for high-dimensional multi-mode scenarios.

Method used

By obtaining the perturbation coefficients of the target mode group, calculating the nonlinear distortion, and performing perturbation operations and digital-to-analog conversion, the nonlinear effects in the mode group transmission process are offset by the pre-distortion at the transmitting end, thereby achieving nonlinear pre-compensation at the transmitting end.

Benefits of technology

Nonlinear compensation is performed in advance at the transmitting end to adapt to high-dimensional transmission scenarios, effectively offsetting the nonlinear damage of multiple spatial channels, improving transmission stability and communication performance, and reducing the processing complexity at the receiving end.

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Abstract

This invention discloses a method, apparatus, device, and medium for nonlinear compensation within a few-mode fiber mode group, relating to the field of coherent optical communication. The method includes: obtaining the perturbation coefficients corresponding to the target mode group; calculating the nonlinear distortion variables corresponding to the original transmitted data of each spatial mode within the target mode group using the perturbation coefficients; performing a perturbation operation on the original transmitted data and the nonlinear distortion variables; performing digital-to-analog conversion on the transmitted data obtained from the perturbation operation; and modulating the digital-to-analog converted information onto an optical signal and transmitting it through the corresponding mode group of the few-mode fiber, thereby using pre-distortion at the transmitting end to offset the nonlinear effects generated during mode group transmission. This allows for pre-compensation of the nonlinear effects of each spatial mode within the target mode group of the few-mode fiber at the transmitting end, adapting to high-dimensional transmission scenarios, effectively solving the nonlinear compensation problem of few-mode fibers, and ensuring transmission quality and system performance.
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