A method and system for on-board optical network fiber end face self-checking

By using an optical modulator and an adjustable beam splitter to modulate a continuous light source into pulsed light in an onboard optical network, and combining it with optical time-domain reflectometry, low-cost multi-channel fiber end-face self-testing is achieved. This solves the problems of high cost and inability to perform multi-channel testing in traditional OTDRs, and improves the reliability and maintainability of the system.

CN122247500APending Publication Date: 2026-06-19SUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU UNIV
Filing Date
2026-03-11
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Traditional optical time domain reflectometers require additional pulsed light sources in vehicle-mounted optical networks, resulting in high costs. Furthermore, they cannot perform end-face status detection on multiple optical fibers after the splitter, making it difficult to meet the self-testing requirements of multiple parallel optical fibers.

⚗Method used

A continuous light source is modulated into pulsed light using an optical modulator, and combined with an adjustable beam splitter to achieve polling detection of multiple fiber end faces. Through the optical time-domain reflectometry detection function, the adjustable beam splitter sequentially selects each fiber branch and collects backscattered signals to determine the end face status.

🎯Benefits of technology

It enables low-cost, multi-path fiber end-face inspection, which can promptly detect losses introduced by connector misalignment or contamination, improving the reliability and maintainability of the system. Furthermore, it dynamically allocates optical power and optimizes the link budget in communication modes.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a self-testing method and system for fiber optic endfaces in vehicular optical networks, relating to the field of optical network communication technology. The method is applied to an optical network architecture comprising a continuous-wave laser, an optical modulator, an adjustable beam splitter / divider, and multiple fiber optic branches. The method includes: entering a detection mode, controlling the optical modulator to activate and modulating continuous light into pulsed light as the detection source for optical time-domain reflectometry (OTDR); a polling selection step, controlling the adjustable beam splitter / divider to sequentially adjust the splitting ratio, allowing the pulsed light to selectively select one fiber optic branch to be tested; signal acquisition and judgment, acquiring the backscattered signal of the currently selected fiber optic branch and determining whether the endface of the fiber optic branch is abnormal based on the reflection peak characteristics; repeating the process until the endface testing of all fiber optic branches is completed. This invention solves the problems of high cost and inability to perform multi-path testing in existing technologies, improving the reliability and maintainability of vehicular optical networks.
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