Multiplex communications – Phase modulation
Reexamination Certificate
2011-07-05
2011-07-05
Vu, Huy D (Department: 2461)
Multiplex communications
Phase modulation
C370S241000
Reexamination Certificate
active
07974182
ABSTRACT:
The position of a disturbance on an optical link is evaluated, in particular where the disturbance is a time-varying disturbance. An optical time domain reflectometry technique is used in which a series of low coherence test pulses is launched by means of an optical pulse source into an the optical link, and the backscattered return signal is monitored. The test pulses pass through an unbalanced Mach Zhender interferometer with the result that for each test pulse, a pair of time-displaced pulse copies is launched onto the link. The backscattered return signal is passed through the same interferometer, which causes the pulse copies of each pair to become realigned and to interfere with one another. A time-varying disturbance is likely to affect each pulse copy of a pair differently. As a result, an abnormality such as a step is likely to occur in the backscattered signal. From the time position of an abnormality, the distance of the disturbance responsible is evaluated.
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Li
Healey Peter
Sikora Edmund S R
British Telecommunications public limited company
Mian Omer
Patterson Thuente Christensen Pedersen , P.A.
Vu Huy D
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