Hussain Joma Abbas; Adnan Taha; Salah Al
Abstract
Mathematical simulation and theoretical investigation for faults detection inoptical fibers were discussed by using computer simulation. The purpose of this work is todetect the faults ...
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Mathematical simulation and theoretical investigation for faults detection inoptical fibers were discussed by using computer simulation. The purpose of this work is todetect the faults that lead to decrease the level of the signal of the single mode fiber (SMF)for a length of (20km) for two wavelengths (1310nm & 1550nm) with attenuation of(0.34dB/km & 0.2dB/km) respectively by using Optical Frequency DomainReflectometer(OFDR).The fusion splice is assumed to be existent about (5km),theconnector about (10km) and the bend about (15km). The losses of these splices, bends,connectors and the levels of the reflected signals from the beginning of the fiber to its endhave been calculated for two wavelengths. The calculation of the reflected signals byOFDR system has shown high resolution. the attenuation of wavelength (1550) nm is lessthan (1310) nm especially in the long distances (Z ³15km), where the bending leads tobig attenuation for the wavelength (1550) nm than (1310) nm where the level of thereflected signals at the point of bending for wavelength (1550) nm was (-87.852dBm) and(-80.2dBm) for the wavelength (1310nm). A novel technique was used to detect the fault by(phase method) by using OFDR system, The degree of the phase is changing suddenly forthe reflected signals in the places where the faults are happening. The phase degreeincreases with the increase of the fiber length.
