Deschênes Jean-Daniel, Genest Jérôme
Opt Express. 2015 Apr 6;23(7):9295-312. doi: 10.1364/OE.23.009295.
Chirped pulse heterodyne is proposed to maximize the signal-to-noise ratio (SNR) when measuring the beat note between an optical frequency comb and a continuous wave (CW) laser. The noise model reveals that all the comb power within the largest possible detection bandwidth can be used to increase the SNR. The chirped comb/CW interference experiment is shown to be equivalent to CW/CW interference, using the comb's spectrally available power. The approach can also greatly alleviate dynamic range issues when detected pulsed heterodyne signals. A beat note SNR of 68.3 dB in a 100 kHz bandwidth is achieved.
提出了啁啾脉冲外差技术，以便在测量光频梳与连续波（CW）激光器之间的拍频时最大化信噪比（SNR）。噪声模型表明，最大可能检测带宽内的所有梳状功率都可用于提高信噪比。啁啾梳状波/CW干涉实验表明，利用梳状波的频谱可用功率，该实验等同于CW/CW干涉。当检测脉冲外差信号时，该方法还可大大缓解动态范围问题。在100 kHz带宽内实现了68.3 dB的拍频信噪比。
