A method and system for coherent optical time domain reflectometry based on parallel correlation coding

By using a coherent optical time-domain reflectometry method based on parallel correlation coding and decoding, the problem of insufficient fault location accuracy in optical fiber communication networks in new energy power plants has been solved. This method enables real-time monitoring of optical fiber status and precise fault location, thereby improving the intelligence and automation level of operation and maintenance.

CN122247501APending Publication Date: 2026-06-19NAT ENERGY CHONGQING WIND POWER DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAT ENERGY CHONGQING WIND POWER DEV CO LTD
Filing Date
2026-04-10
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing fiber optic communication networks lack sufficient fault location accuracy in new energy power plants, especially over long distances where the accuracy drops to the kilometer level. Furthermore, they lack real-time online diagnostics and intelligent operation and maintenance capabilities for fiber optic status, thus failing to meet the needs of smart wind power.

Method used

A coherent optical time-domain reflectometry method based on parallel correlation coding and decoding is adopted. A continuous and uninterrupted modulated probe light signal is generated by a low-power digitally coded laser. Parallel correlation operations are performed by a field-programmable gate array (FPGA) to achieve real-time and continuous monitoring of the fiber optic status and accurate fault location. Combined with a data server, pattern feature recognition and trend analysis are performed to establish a predictive model for fault early warning.

Benefits of technology

It enables 24/7 uninterrupted monitoring of fiber optic status, accurately measures fiber length, attenuation, and breakpoint location, shortens fault location time to the millisecond level, improves the automation and intelligence level of operation and maintenance, and realizes the transformation from fault location to early warning.

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Abstract

This invention discloses a coherent optical time-domain reflectometry method based on parallel correlation coding and decoding. A continuous, uninterrupted modulated probe light signal is generated using a low-power digitally coded laser. This modulated probe light signal is coherent light with a specific pseudo-random coding sequence. The modulated probe light signal is coupled into the single-mode fiber under test, and coherent reflected light signals generated by backscattering Rayleigh and Fresnel reflection in the fiber are simultaneously acquired. The acquired coherent reflected light signals are coherently demodulated, and the baseband electrical signal is input into a field-programmable gate array (FPGA). Based on the distribution curve, the precise location information of the fiber link length, total attenuation, breakpoints, and connectors is quantitatively analyzed. This invention enables low-power continuous wave operation, fundamentally eliminating the detector saturation region. Combined with the parallel continuous correlation processing of the FPGA, it achieves accurate measurement of near-end events in the optical fiber.
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