星地激光通信中光學數(shù)字相干接收機的研究
發(fā)布時間:2019-01-04 15:46
【摘要】:光學數(shù)字相干接收技術(shù)在星地激光通信中具有廣泛的應(yīng)用前景。本文以窄線寬DFB激光器作為光源,采用自動頻率控制環(huán)路,結(jié)合光學混頻和數(shù)字信號處理技術(shù),實現(xiàn)了最高速率為1.25 Gbps的相干光通信。實驗結(jié)果表明,自動頻率控制環(huán)路能夠?qū)⑿盘柟夂捅菊窆庵g的頻率差實時控制在10 Hz以內(nèi),光學混頻器輸出的I、Q兩路信號相位差能夠長時間穩(wěn)定保持90°,基于FPGA的載波相位補償技術(shù)能夠有效修正自動頻率控制環(huán)路的相位殘差,在誤碼率為10~(-6)條件下,該接收機的靈敏度優(yōu)于每比特54個光子。
[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 擄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).
【作者單位】: 中國電子科技集團公司第二十七研究所;
【分類號】: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 擄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).
【作者單位】: 中國電子科技集團公司第二十七研究所;
【分類號】:TN929.1
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