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

G - Physics

01

B

33/45, 73/55

G01B 11/14 (2006.01) G01B 11/02 (2006.01) G01C 3/00 (2006.01) G01C 5/00 (2006.01)

Patent

CA 1145927

METHOD AND APPARATUS FOR OPTICAL FIBER FAULT LOCATION Abstract of the Disclosure A discontinuity within an optical fiber is located using a reflectometry technique. A swept frequency sinusoidal signal is launched into the fiber, is reflected from the remote discontinuity, and is returned to the fiber input end. The signal consists of the combined outputs of two optical sources identically frequency modulated and having output wavelengths .lambda.1, .lambda.2 separated by several nanometers. The light at .lambda.1 has a group velocity different from the light at .lambda.2 and consequenty, reflected light components at .lambda.1 and .lambda.2 interfere with each other at the fiber input end. The interference signal is frequency dependent and from the frequency dependence the distance from the fiber input end to the discontinuity can be calculated. The received signal is dependent also on the difference in group index at .lambda.1 and .lambda.2, this difference being relatively insensitive to temperature, stress and fiber composition. In contrast, the group index for a particular wavelength is sensitive to these parameters and so affects the results of known single wavelength and pulse techniques. In this respect the method proposed is more accurate than known optical time-domain and frequency-domain reflectometry techniques. - i -

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