Ruitao Yang, Hao Sun, Pengcheng Hu, Hongxing Yang, Haijin Fu, Liang Yu, Xu Xing, Xuemei Ding, Jiubin Tan, "Real-time suppression of random phase drift for laser ranging with high-frequency intermode beats," Chin. Opt. Lett. 21, 041202 (2023)

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- Chinese Optics Letters
- Vol. 21, Issue 4, 041202 (2023)

Fig. 1. Typical example of downconversion signal processing in ranging with comb IMBs. Mea, measurement signal; Ref, reference signal; PD, photodetector; BM, balanced mixer; LO, local oscillator; DAQ, data acquisition.

Fig. 2. System diagram of the real-time RPD suppression. BS, beam splitter.

Fig. 3. Experimental setup of ranging with the comb IMBs suppressing the RPD in real time. PBS, polarization beam splitter; H, half-wave plate; Q, quarter-wave plate; PS, power splitter; BPF, bandpass filter.

Fig. 4. RF response of the measurement PD. (a) Beat fIMB with the signal comb detected individually; (b) beat fIMBL with the local comb detected individually; (c) beat fIMB and (d) beat fIMBL with the two combs (of the same optical power) detected simultaneously. P1 dB, RF power at the 1-dB compression point.

Fig. 5. Experimental results of real-time RPD suppression. (a) Comparison of the distance variation measurement results without and with the real-time suppression; (b) zoom-in details of the suppressed results in the Y-scale; (c) Allan deviation of the measurement results with and without the RPD suppression.

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