Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-12-21
1998-04-21
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
385 48, 356 731, 25022715, 25022716, G02B 626, G01N 2100, G01J 104
Patent
active
057427151
ABSTRACT:
The apparatus of this invention includes a macrobend/microbend unit which imposes first and second macrobends, and microbends between the first and second macrobends, on an optical fiber under analysis. If light is travelling in one direction on the optical fiber, the bending of the optical fiber is such that some light will escape from the core of the optical fiber at the first macrobend. A first photodetector is arranged to receive light emitted from the first macrobend, and generates a signal indicative of whether light is present at the first macrobend. If light is travelling in the optical fiber in the other direction, the second macrobend causes some light to be emitted. A second photodetector arranged to receive light from the second macrobend, generates a signal indicative of whether light is present at the second macrobend. The apparatus includes a display, generated based on the signals from the photodetectors, indicating the optical fiber status including information such as whether light is travelling in the optical fiber in one direction or the other, whether the optical fiber is live or dead, and/or whether the light emitted from the optical fiber includes a tone signal of fixed frequency. For example, the apparatus can be used to aid a repair technician in quickly determining the optical fibers in need of repair in a damaged optical fiber cable containing many optical fibers. The invention also includes a related method.
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Boehlke Bruce B.
Darden Bruce Vaiden
Mettler Stephen Clement
Mock George Edwin
Lucent Technologies - Inc.
Sanghavi Hemang
Ullah Akm E.
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