The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2025
Filed:
Apr. 14, 2021
Ntt, Inc., Tokyo, JP;
Tatsuya Okamoto, Tokyo, JP;
Daisuke Iida, Tokyo, JP;
Yusuke Koshikiya, Tokyo, JP;
Nazuki Honda, Tokyo, JP;
NTT, Inc., Tokyo, JP;
Abstract
A cable test system, an analysis apparatus, a cable test method, and a program are capable of recognizing a sag section of an overhead cable without sending a worker to a site. In some implementations, the cable test system includes an optical fiber vibration distribution measurement apparatus that acquires a vibration distribution waveform of an overhead optical fiber cable to be tested. The vibration distribution waveform being represented in a time domain and a distance domain in a longitudinal direction. The analysis apparatus that calculates a propagation speed of vibrations propagating through the overhead optical fiber cable from the vibration distribution waveform and detects, as a cable sag section, a section of the overhead optical fiber cable in which the propagation speed is equal to or lower than a threshold value.