Chinese Optics Letters, Volume. 18, Issue 9, 090602(2020)
Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying
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Fig. 2. Principle of electro-optic modulation frequency shift as OVCO.
Fig. 4. Phase-error standard deviation versus loop natural frequency.
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.
Table 1. Experimental Parameters
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Parameter Symbol Value Laser wavelength 1549.72 nm Received signal power −45 to Communication rate 10 Gbps Linewidth (TX/RX) 300 Hz Responsivity 0.85 A/W Power-splitting ratio 0.5
Table 2. Specification List about FPGA
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Name Parameter Fourth-power look-up table Input bitwidth: 7 bit Output bitwidth: 10 bit First-order active loop filter Input bitwidth: 10 bit Output bitwidth: 32 bit Direct digital synthesizer Phase accumulator word: 32Output bitwidth: 16 bit Working clock 125 MHz
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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," Chin. Opt. Lett. 18, 090602 (2020)
Paper Information
Category: Fiber Optics and Optical Communications
Received: Mar. 18, 2020
Accepted: May. 25, 2020
Published Online: Jul. 31, 2020
The Author Email: Shaowen Lu (lushaowen@siom.ac.cn), Xia Hou (hou_xia@siom.ac.cn)
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