The spectral broadening of the pump pulse through self phase modulation in a time domain distributed Brillouin sensor is demonstrated to have a non-negligible detrimental effect, leading to a doubling of the effective gain linewidth after some 20 km in standard conditions. The theoretical modeling is fully confirmed by experimental results.
Third European Workshop on Optical Fibre Sensors ,Napoli, Italy, July 2007We present a multi-wavelength fiber source based on cascaded of four-wave mixing in two semiconductor optical amplifiers followed by further four-wave mixing in an optical fiber enhanced by Raman amplification. The multi-wavelength source is generated by two initial frequencies detuned 200 GHz and referenced in the absorption lines of the acetylene 12C2H 2, which sweep in frequency keeping the detuning of the lasers constant. With this configuration, we have achieved a high resolution source with a spectrum of 36 channels centered with adjustable peaks separation. The source can be employed to interrogate a fiber Bragg grating sensors network and in gas spectroscopy applications
Divi5ión de ln5talacione5 del l. E. T. c. c. introducciónSe admite que el movimiento o paso de vapor a través de un medio poroso viene regido por la ley de Fick: q,. = · k grad. C en la cual el signo menos indica que el vapor se mueve en el sentido de las concentraciones decrecientes.Y si admitimos, como simplificación, que únicamente hay movimiento en la dirección del eje X, entonces:Si se supone que se eumple la ecuación de los gases perfectos,R'i' P y sustituyendo, teniendo en cuenta que operamos a lempemtura constante, toma la forma:(/r = kM dp Id . d.r dp --tl _, - ... tt dp t P¡
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