Patent ID: 8989526
Filing Date: 2015-03-24
Classification: G01D,G01M,G01N,H01S,H04B

Abstract:
1. A method of providing Raman amplification in an optical fiber sensing system, comprising: generating a probe pulse of light at a probe wavelength; launching the probe pulse into a sensing optical fiber; generating pump light at a pump wavelength shorter than the probe wavelength; modulating the pump light to produce a time-varying intensity profile; launching the modulated pump light into the sensing fiber such that the intensity of the launched modulated pump light during launch of the probe pulse is different from the intensity of the launched modulated pump light at one or more other times; and propagating the launched modulated pump light and the probe pulse along the sensing fiber to control Raman amplification of backscattered light produced by the probe pulse separately from Raman amplification of the probe pulse.