Method and apparatus for optical fiber fault location

Details Method and apparatus for optical fiber fault location Method and apparatus for optical fiber fault location

H - Electricity

04

B

73/58

H04B 3/46 (2006.01) G01R 31/08 (2006.01) H04B 10/08 (2006.01)

Patent

CA 1137787

METHOD AND APPARATUS FOR OPTICAL FIBER FAULT LOCATION Abstract of the Disclosure A discontinuity within a fiber is located using a reflectometry technique. A swept frequency sinusoidal signal is launched into the fiber from one end and propagates along the fiber. If the discontinuity is reflecting the signal is reflected, while if non-reflecting, backscatter is markedly reduced. Both conditions can be monitored when a signal returned to the fiber input end interferes constructively or destructively with the input signal depending on the phase difference between them. Both the amplitude and phase of the resulting interference signal vary periodically with frequency. From the periodicity, the distance from the input end of the fiber to the discontinuity can be derived.

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