Abstract
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 pump pulses with peak power of , self-phase modulation leads to a doubling of the effective gain linewidth after some , which is equivalent to a contrast loss of in the measurement. The impact is higher for shorter pulses (higher resolution). The theoretical modeling is fully confirmed by experimental results.
© 2011 Optical Society of America
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