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The point of failure must be located quickly and accurately.But if the cable system fails;Fresnel optical lens in the vast sea.Good concealment, anti - destruction, anti - interference ability and other characteristics.Fresnel optical lenses from hundreds of meters deep.Or war, as a means of sea communication, all have the advantage of cannot be replaced by any other means of communication, Fresnel optical lens with the wide use of submarine cable across the globe and millions of kilometers of the laying of submarine cable lines, or even thousands of meters on the seabed to salvage the submarine cable of less than 10 cm in diameter, about the social consequences of submarine cable fault is a large Fresnel optical lens, like the ask search for a needle in a haystack, to do this, undersea communication optical cable (hereinafter referred to as the submarine cable) communication is stable and reliable quality of the Fresnel optical lens, and the particularity of submarine cable fault location and repair has a strong.At ordinary times, the large-capacity cable system plays a very important role in the information superhighway of modern society.Fault point must be fixed as quickly as possible, therefore, the secrecy good, the fault point measurement and submarine cable fault point precise positioning is the key technology of the Fresnel optical lens, the second is in the sea to accurate location of fault point, many originally applied to land cable maintenance test method is no longer applicable, fault location, there are two contents: one is from the shore test cable fault point distance, in the process of submarine cable maintenance, maintenance, the Fresnel optical lens.