Title :
Characteristics and reduction of coherent fading noise in Rayleigh backscattering measurement for optical fibers and components
Author :
Shimizu, Kaoru ; Horiguchi, Tsuneo ; Koyamada, Yahei
Author_Institution :
NTT, Ibaraki, Japan
fDate :
7/1/1992 12:00:00 AM
Abstract :
The characteristics of fading noise in Rayleigh backscattering measurements made with coherent lightwaves such as in coherent-OTDR (optical time-domain reflectometry) and coherent-OFDR (optical frequency-domain reflectometry) are studied. The effects of frequency shift averaging on fading noise reduction are clarified theoretically, and the relationships between measurement accuracy and other parameters, such as spatial resolution and frequency variation range are derived. The calculated results of loss measurement accuracy are in good agreement with experimental data. The formula can also be applied to low-coherence interferometric OTDR
Keywords :
Rayleigh scattering; backscatter; noise; optical fibres; optical testing; time-domain reflectometry; Rayleigh backscattering measurement; coherent fading noise; coherent lightwaves; coherent-OFDR; coherent-OTDR; fading noise reduction; frequency shift averaging; frequency variation range; loss measurement accuracy; low-coherence interferometric OTDR; measurement accuracy; optical fibers; optical fibres; optical frequency-domain reflectometry; optical loss measurement; optical time-domain reflectometry; spatial resolution; Backscatter; Frequency measurement; Noise measurement; Noise reduction; Optical interferometry; Optical noise; Rayleigh channels; Reflectometry; Spatial resolution; Time domain analysis;
Journal_Title :
Lightwave Technology, Journal of
