Proceedings PaperDetection Of Discrete Faults With Very Low Reflectivity Along Optical Fibers
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Optical Frequency Domain Reflectometer (OFDR) has shown certain advantages over the Optical Time Domain Reflectometer (OTDR) for the detection of discrete faults along optical fibers (1-4). An OFDR usually employs a cw optical carrier modulated by a constant amplitude rf signal with a periodic linear frequency sweep (shown in Fig. 1). The detected optical echoes are delayed by propagation in the fiber to produce a delay in the sweep phase of the modulation. In this paper, OFDR has been employed for the detection of discrete faults with very low reflectivity along optical fibers by taking Fourier transform of the complex envelope of the echoes.