Title :
Detection of faults in short fiber by the phase compensated reflectometer
Author :
Hangai, Seiichiro ; Taki, Yasuo
Author_Institution :
Fac. of Eng. Sci., Tokyo Univ., Japan
Abstract :
A phase-compensated reflectometer designed for removing step error in frequency-domain reflectometry is applied to detect Fresnel reflection points in a short fiber (from 0.5 m to 2 km). This reflectometer makes it possible to distinguish multiple close reflections from one another. In addition, the signal/noise ratio is easily improved by narrowing the effective bandwidth of the receiver. By widening the swept bandwidth of the reflectometer, it is found that a break point in the graded-index fiber (125/150) and a joint close to it are distinguished clearly with ±0.025 m accuracy and 0.25-m spatial resolution
Keywords :
fault location; gradient index optics; optical fibres; optical testing; reflectometers; 0.5 m to 2 km; Fresnel reflection points; break point; fault detection; frequency-domain reflectometry; graded-index fiber; multiple close reflections; optical testing; phase compensated reflectometer; short fiber; signal/noise ratio; step error; Band pass filters; Bandwidth; Fault detection; Frequency; Optical fiber communication; Optical fibers; Optical receivers; Phase detection; Reflectometry; Spatial resolution;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1989. IMTC-89. Conference Record., 6th IEEE
Conference_Location :
Washington, DC
DOI :
10.1109/IMTC.1989.36875
