【摘 要】
：
At the mirrors of a laser diode self-mixing interferometer,the output beams carry anti-correlated[i.e.,in phase opposition]interferometric signals,whereas the superposed noise fluctuations are[partially]correlated.Therefore,by using an instru-mental outpu
【机 构】
：
Department of Industrial and Information Engineering,University of Pavia,27100 Pavia,Italy;Departmen
论文部分内容阅读
At the mirrors of a laser diode self-mixing interferometer,the output beams carry anti-correlated[i.e.,in phase opposition]interferometric signals,whereas the superposed noise fluctuations are[partially]correlated.Therefore,by using an instru-mental output of the interferometer as the difference of the two,we double the amplitude of the self-mixing useful signal,while the superposed noise is reduced.To validate the idea,we first calculate the noise reduction by means of a second-quantization model,finding that in a laser diode the signal-to-noise ratio[SNR]can be improved by 8.2 dB,typically.Then,we also carry out an experimental measurement of SNR and find very good agreement with the theoretical result.
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