Track zero calibration method of optical time domain reflectometer and related product

By embedding a reference fiber in the optical time domain reflectometer and using its reflected light power for zero-point calibration, the problem of inaccurate zero point on the longitudinal axis of the optical time domain reflectometer is solved, enabling accurate measurement of fiber absolute loss and improved readability of the trajectory curve.

CN121283497APending Publication Date: 2026-01-06BEIJING UBIQUITOUS CLOUD TECH CO LTD
2 Cites 0 Cited by

Patent Information

Application Number
CN202511627538.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-07
Publication Date
2026-01-06

AI Technical Summary

Technical Problem

Existing optical time domain reflectometers (OTDRs) have inaccurate zero-point calibration of the vertical axis when measuring fiber loss, resulting in poor readability of the trajectory curve and making it difficult to intuitively reflect the absolute loss changes at various positions of the fiber under test.

Method used

A reference fiber with a length greater than the spatial resolution of a short pulse signal scan is built into the optical time domain reflectometer. By determining the reflected light power of the reference fiber, the translation amount is calculated to shift the original trajectory curve, thereby completing the zero-point calibration and obtaining the absolute loss trajectory curve of the fiber under test.

Benefits of technology

This method enables the vertical axis values ​​at various positions of the fiber under test to accurately reflect the absolute loss, improves the readability of the trajectory curve, and facilitates the comparison of trajectory curves of the same fiber at different times.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a track zero calibration method of an optical time domain reflectometer and a related product, and the method comprises the steps that the optical time domain reflectometer emits a short pulse signal which sequentially passes through a reference optical fiber and an optical fiber to be measured, an original track curve corresponding to the short pulse signal is obtained, the reference optical fiber is arranged in the optical time domain reflectometer, and the reference optical fiber is arranged in the optical time domain reflectometer; the length of the reference optical fiber is greater than the spatial resolution of short pulse signal scanning; based on the original trajectory curve, determining reflected light power corresponding to the reference optical fiber; obtaining a first translation amount of the original trajectory curve based on the reflected light power corresponding to the reference optical fiber; and translating the original trajectory curve based on the first translation amount, completing calibration of a zero point, and obtaining an absolute loss trajectory curve corresponding to the to-be-measured optical fiber. Therefore, after zero calibration, the longitudinal axis value of the absolute loss trajectory curve can directly correspond to the absolute loss of each position of the optical fiber to be measured, and the trajectory curves of the same optical fiber at different moments can be conveniently compared, so that the readability of the trajectory curve is improved.
Need to check novelty before this filing date? Find Prior Art