Raman amplification in distributed optical fiber sensing...

H - Electricity – 04 – B

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H04B 10/17 (2006.01) G01M 11/00 (2006.01)

Patent

CA 2659457

A method of providing Raman amplification in an optical fiber sensing system, comprises generating a probe pulse of light and launching the pulse into a sensing optical fiber, generating pump light at a shorter wavelength and modulating it to produce a time-varying intensity profile, and launching the pump light into the sensing fiber such that the intensity of the launched pump light during launch of the probe pulse is different from the intensity at other times. Raman amplification of backscattered light produced by the probe pulse as it propagates along the fiber is achieved, as is amplification of the probe pulse if the pump power is non-zero during launch of the probe pulse.

Procédé destiné à fournir une amplification Raman dans un système de détection à fibre optique, le procédé consistant à générer une impulsion de lumière de sonde et lancer l'impulsion dans une fibre optique de détection, à générer une lumière d'aspiration à une longueur d'onde plus courte et la moduler afin de produire un profil d'intensité à variation temporelle, et à lancer la lumière d'aspiration dans la fibre de détection de sorte que l'intensité de la lumière d'aspiration lancée pendant le lancement de l'impulsion de sonde soit différente de l'intensité à d'autres moments. L'amplification Raman d'une lumière rétrodiffusée produite par l'impulsion de sonde quand elle se propage le long de la fibre est réalisée, ainsi que l'amplification de l'impulsion de sonde si la puissance d'aspiration n'est pas égale à zéro pendant le lancement de l'impulsion de sonde.

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