星地激光通信中光学数字相干接收机的研究
发布时间：2019-01-04 15:46
【摘要】：光学数字相干接收技术在星地激光通信中具有广泛的应用前景。本文以窄线宽DFB激光器作为光源,采用自动频率控制环路,结合光学混频和数字信号处理技术,实现了最高速率为1.25 Gbps的相干光通信。实验结果表明,自动频率控制环路能够将信号光和本振光之间的频率差实时控制在10 Hz以内,光学混频器输出的I、Q两路信号相位差能够长时间稳定保持90°,基于FPGA的载波相位补偿技术能够有效修正自动频率控制环路的相位残差,在误码率为10~(-6)条件下,该接收机的灵敏度优于每比特54个光子。
[Abstract]:Optical digital coherent reception technology has a wide application prospect in satellite-to-ground laser communication. In this paper, the narrow linewidth DFB laser is used as the light source, the automatic frequency control loop is adopted, and the optical mixing and digital signal processing techniques are combined to realize the coherent optical communication with the highest rate of 1.25 Gbps. The experimental results show that the frequency difference between the signal light and the local oscillator can be controlled within 10 Hz by the automatic frequency control loop, and the phase difference between the two signals of the optical mixer can be kept at 90 掳for a long time. The carrier phase compensation technique based on FPGA can effectively correct the phase residuals of the automatic frequency control loop. The sensitivity of the receiver is better than 54 photons per bit when the BER is 10 ~ (-6).
【作者单位】： 中国电子科技集团公司第二十七研究所;
【分类号】：TN929.1
[Abstract]:Optical digital coherent reception technology has a wide application prospect in satellite-to-ground laser communication. In this paper, the narrow linewidth DFB laser is used as the light source, the automatic frequency control loop is adopted, and the optical mixing and digital signal processing techniques are combined to realize the coherent optical communication with the highest rate of 1.25 Gbps. The experimental results show that the frequency difference between the signal light and the local oscillator can be controlled within 10 Hz by the automatic frequency control loop, and the phase difference between the two signals of the optical mixer can be kept at 90 掳for a long time. The carrier phase compensation technique based on FPGA can effectively correct the phase residuals of the automatic frequency control loop. The sensitivity of the receiver is better than 54 photons per bit when the BER is 10 ~ (-6).
【作者单位】： 中国电子科技集团公司第二十七研究所;
【分类号】：TN929.1
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