Evaluating the position of a time-varying disturbance

G - Physics – 01 – M

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G01M 11/00 (2006.01)

Patent

CA 2560780

The present invention relates to a method of and apparatus for evaluating the position of a disturbance on an optical link, 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 (18) into an the optical link (16), and the backscattered return signal is monitored. The test pulses pass through an unbalanced Mach Zhender interferometer (20) with the result that for each test pulse, a pair of time-displaced pulse copies is launched onto the link (16). The backscattered return signal is passed through the same interferometer (20), which causes the pulse copes of each pair to become realigned and to interfere with one another. A time-varying disturbance (x) is likely to affect each pulse copy of a pair differently. As a result, an abnormality such as a step is likely occur in the backscattered signal. From the time position of an abnormality, the distance of the disturbance responsible is evaluated.

La présente invention a trait à un procédé et un appareil permettant l'évaluation de la position d'une perturbation sur une liaison optique, notamment lorsque la perturbation est une perturbation variable dans le temps. Une technique de réflectométrie de domaine temporel optique dans laquelle une série d'impulsions de test de cohérence faible est mise en oeuvre dans la liaison optique, et le signal retour rétrodiffusé est contrôlé. Les impulsions de test traversent un interféromètre Mach Zender déséquilibré entraînant le lancement d'une paire de copies d'impulsions décalées dans le temps sur la liaison pour chaque impulsion de test. Le signal retour rétrodiffusé est amené à traverser le même interféromètre, entraînant le réalignement des copies d'impulsions de chaque paire et leur interférence mutuelle. Un perturbation variable dans le temps va probablement affecter chaque copie d'impulsions d'une paire de manière différente. Par conséquent, une anomalie, telle qu'un bond est susceptible de se produire dans le signal rétrodiffusé. Sur la base de la position temporelle d'une anomalie, on évalue la distance de la perturbation qui en est la cause.

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