Patent ID: 9163958
Filing Date: 2015-10-20
Classification: G01D,G01N,H04B

Abstract:
1. A method for distributed sensing of one or more measurable parameters of an optical fiber, comprising: generating a first pump light wave having a frequency centered at ω modulating the first pump light wave to obtain a first modulated pump light wave; transmitting the first modulated pump light wave into the optical fiber through a first end thereof; receiving at an end of the optical fiber a scattered light wave signal with a frequency approximately equal to ω monitoring at least the frequency of the received light wave signal; and calculating from the monitored frequency of the received light wave signal a magnitude of a sensed measurable parameter of the optical fiber, wherein said modulating step comprises modulating at a rate higher than about 1 GHz and lower than about 100 GHz using an anharmonic modulation signal, and wherein the modulation is frequency modulation or phase modulation, thereby enhancing a spatial resolution of said sensing.