Shaowen Lu, Yu Zhou, Funan Zhu, Jianfeng Sun, Yan Yang, Ren Zhu, Shengnan Hu, Xiaoxi Zhang, Xiaolei Zhu, Xia Hou, Weibiao Chen. Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying[J]. Chinese Optics Letters, 2020, 18(9): 090602
- Chinese Optics Letters
- Vol. 18, Issue 9, 090602 (2020)
Fig. 1. Schematic of the QPSK fourth-power phase-lock loop.
Fig. 2. Principle of electro-optic modulation frequency shift as OVCO.
Fig. 3. Linear model of the analog fourth-power OPLL.
Fig. 4. Phase-error standard deviation versus loop natural frequency.
Fig. 5. Optimized natural frequency versus loop delay time.
Fig. 6. (a) Frequency fluctuation PSD of the transmitter (TX)/receiver (RX) laser and (b) the constellation of the QPSK modulation signal.
Fig. 7. QPSK fourth-power phase-lock loop simulation: (a) the Lissajous of the original signal sampled by 125 MSa/s; (b) the fourth power of the original signal; (c) phase error of the phase-locked state; (d) the constellation of the recovered IQ signal.
Fig. 8. BER versus received signal power for 2.5 Gbaud/5 Gbaud.
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Table 1. Experimental Parameters
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Table 2. Specification List about FPGA
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