Optical Fiber Line Surveillance System for Preventive Maintenance Based on Fiber Strain and Loss Monitoring

Izumi SANKAWA
Yahei KOYAMADA
Shin-ichi FURUKAWA
Tsuneo HORIGUCHI
Nobuo TOMITA
Yutaka WAKUI

Publication
IEICE TRANSACTIONS on Communications   Vol.E76-B    No.4    pp.402-409
Publication Date: 1993/04/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Cables and Related Technologies)
Category: 
Keyword: 
optical fiber,  connector,  surveillance system,  preventive maintenance,  optical time domain reflectometry,  

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Summary: 
This paper proposes a surveillance system concept, which includes the analysis of fiber fault factors and monitored items, the architecture for diagnosing fiber degradation and the system configuration. Fiber faults are classified into two types. One is fiber failure caused by fiber axial tensile strain and the other is fiber loss increase caused by fiber bending and the absorption of hydrogen molecules. It was found that there is an urgent need for fiber axial strain monitoring, sensitive loss monitoring operating at longer wavelengths and water sensing, in order to detect the origin and early indications of these faults before the service is affected. Moreover, an algorithm for predicting and diagnosing fiber faults based on the detected results was investigated and systematized.