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Amplifier assisted CRDS (cavity ring-down spectroscopy) is proposed to realize ppm-order gas sensing using optical waveguide with telecom wavelength band. One issue of the amplifier assisted CRDS syst...em is that the self-lasing may happen when optical amplifier is at high pumping condition. Self-lasing light takes away the gain of amplifier from the signal light, limits the sensing sensitivity. To stop the self-lasing, we proposed the polarization direction control scheme in this work. The experimental results show the light intensity of self-lasing light is suppressed down below -50dBm, and the gain of signal light improved 24dB.続きを見る
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