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.


Published in:
Optics Letters, 36, 2, 97
Year:
2011
Publisher:
Optical Society of America
ISSN:
1539-4794
Keywords:
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 Record created 2011-01-07, last modified 2018-03-18

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