Title :
Measurement of Rayleigh backscattering in single-mode fibers based on coherent OFDR employing a DFB laser diode
Author :
Shimizu, Kaoru ; Horiguchi, Tsuneo ; Koyamada, Yahei
Author_Institution :
NTT Telecommun. Field Syst., Ibaraki, Japan
Abstract :
Rayleigh backscattering in a single-mode optical fiber was measured by coherent optical frequency-domain reflectometry (C-OFDR) employing a frequency-variable distributed-feedback laser diode (DFB-LD). Backscattered power from the neighborhood of the far end of a 0.5-km-long fiber was measured with a spatial resolution of 50 cm. The insertion of a delay line fiber in the reference optical path and an acoustooptic frequency shifter in the signal optical path made it possible to measure backscattering in a long optical fiber in spite of the short coherence length of the DFB-LD.<>
Keywords :
Rayleigh scattering; backscatter; measurement by laser beam; optical fibres; optical testing; reflectometry; 0.5 km; DFB laser diode; Rayleigh backscattering; acoustooptic frequency shifter; backscattered power; coherent OFDR; delay line fiber; frequency variable DFB LD; optical fiber; optical frequency-domain reflectometry; reference optical path; signal optical path; single-mode fibers; spatial resolution; Backscatter; Diode lasers; Distributed feedback devices; Fiber lasers; Frequency measurement; Length measurement; Optical feedback; Optical fibers; Phase measurement; Spatial resolution;
Journal_Title :
Photonics Technology Letters, IEEE
