Detrimental effect of self-phase modulation on the performance of Brillouin distributed fiber sensors
We show that the spectral broadening of the pump pulse through self-phase modulation in a time-domain distributed Brillouin sensor has a considerably detrimental effect in the measurement, especially in the case of long distances and high-resolution pulses. Using 30ns pump pulses with peak power of 276mW, self-phase modulation leads to a doubling of the effective gain linewidth after some 20km, which is equivalent to a contrast loss of 2dB in the measurement. The impact is higher for shorter pulses (higher resolution). The theoretical modeling is fully confirmed by experimental results.
Keywords: Fiber optics and optical communications : Fiber optics sensors ; Nonlinear optics : Stimulated scattering, modulation, etc. ; Nonlinear optics : Kerr effect ; Nonlinear optics : Nonlinear optics, fibers ; Scattering : Scattering, stimulated Brillouin
Record created on 2011-01-07, modified on 2016-12-05