Optimization of pulse width for electric time domain reflectometry for fault point localization of power feeding lines of optical submarine cables

As techniques for locating the fault point in the power feeding line of an optical submarine cable, the electric time domain reflector(TDR) is discussed. The location of the failure point of the power feeding line of the optical submarine cable can be measured using an electric time domain reflectometry (TDR). In TDR, round-trip time of an electric pulse is measured. However as the frequency dispersion and attenuation of the electric signals propagating in the power feeding lines are large, it is not easy to accurately calculate the fault point from the round trip time. In this paper, we will discuss the section of the optimum pulse width from the viewpoint of the attenuation of the pulse. In this paper, frequency and time domain analysis of LW cable[1] is used to obtain the optimum pulse width depending on the distance to the fault point.