Marin Yisbel, Velha Philippe, Oton Claudio J
Opt Express. 2020 Nov 23;28(24):36849-36861. doi: 10.1364/OE.405598.
We present a novel phase generated carrier (PGC) demodulation technique for homodyne interferometers which is robust to modulation depth variations and source intensity fluctuations. By digitally mixing the waveform with a multitone synthetic function (a linear combination of harmonics of the modulating signal), distortion can become negligible even in presence of large variations of the modulation depth. The technique only requires two mixers and can also provide the DC component of the phase in real time, without needing any previously recorded data or ellipse-fitting algorithms. We validate the technique with simulated waveforms and with experimental data from a wavelength metering experiment using an integrated unbalanced interferometer on-chip, showing that the technique corrects distortion without increasing the noise with respect to the standard PGC technique.
我们提出了一种用于零差干涉仪的新型相位生成载波（PGC）解调技术，该技术对调制深度变化和光源强度波动具有鲁棒性。通过将波形与多音合成函数（调制信号谐波的线性组合）进行数字混频，即使在调制深度有很大变化的情况下，失真也可变得微不足道。该技术仅需要两个混频器，并且还能实时提供相位的直流分量，无需任何预先记录的数据或椭圆拟合算法。我们使用模拟波形以及来自一个使用集成片上非平衡干涉仪的波长计量实验的实验数据对该技术进行了验证，结果表明该技术在不增加相对于标准PGC技术的噪声的情况下校正了失真。
