A method, system and OTDR device for avoiding event dead zones in optical time domain reflectometry

By using photocurrent cancellation compensation technology in a dual-source system, the problem of event blind zone in the OTDR system is solved, enabling more efficient and accurate fiber optic measurement, avoiding noise interference, and improving the measurement accuracy and efficiency of the OTDR system.

CN120454844BActive Publication Date: 2026-07-24JIANGNAN UNIV +1
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
CN202510595078.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-09
Publication Date
2026-07-24
Estimated Expiration
2045-05-09

AI Technical Summary

Technical Problem

Existing OTDR systems suffer from event blind zones over a wide dynamic range, making it impossible to accurately measure reflection and attenuation events on fiber optic lines. Furthermore, existing solutions introduce additional noise, affecting measurement accuracy and efficiency.

Method used

A dual-light source system is adopted, and a second detector is used for photocurrent cancellation compensation to avoid saturation of the analog amplifier circuit. By estimating the saturation time interval and compensating the optical signal, an accurate OTDR curve is generated, avoiding event blind spots and reducing noise interference.

Benefits of technology

It effectively avoids event blind spots, improves the accuracy and noise performance of OTDR measurements, and reduces measurement time, thereby increasing measurement efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120454844B_ABST
    Figure CN120454844B_ABST
Patent Text Reader

Abstract

The application discloses an optical time domain reflectometry (OTDR) method, system and OTDR equipment for avoiding event blind area, and relates to the technical field of OTDR. The OTDR method adds a second detector to the ground end of a first detector, and detects the optical signal emitted by a second light source by using the second detector. Then, when measuring the OTDR curve of a to-be-measured optical fiber, the second driver is controlled to drive the second light source to emit a compensation optical signal within a pre-determined saturation time interval, so that the photocurrent detected by the second detector offsets and compensates the photocurrent detected by the first detector, and the current input to the amplification circuit is lower than the saturation threshold, thereby eliminating the event blind area caused by saturation, enabling the blind area event to be detected, and without adding a selection switch, thereby avoiding introducing additional noise, improving the optical fiber OTDR test accuracy and having better noise performance.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Compensation method, device and equipment for optical fiber measurement data and storage medium

    CN116054931A

  • Optical signal detection apparatus and method and related device

    US20230213408A1