Doppler frequency shift measurement and direction discrimination based on a bidirectional phase modulator and a Sagnac loop
Doppler frequency shift measurement and direction discrimination based on a bidirectional phase modulator and a Sagnac loop
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基于双向相位调制器和萨尼亚克环的多普勒频移测量和方向判别
DOI：
10.1016/j.ijleo.2020.165850
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发表时间：
2021-01
期刊：
影响因子：
3.1
通讯作者：
Zhang Yinling
中科院分区：
文献类型：
--
作者：
Chen Dan;Shang Tao;Li Gufeng;Liu Xiongchao;Zhang Yinling
提出并论证了一种实现多普勒频移（DFS）测量和方向鉴别的光子方法。在该方法中，双向PM和Sagnac环被用来获得正交偏振的光信号。与波分复用器（WDM）相结合，正交偏振信号的上下边带被分离。经过两个平衡的光电探测器（BPD），实现了I/Q平衡检测。随后，在低频90°电混合耦合器（90° HC）的输出端口处同时估计DFS的值和方向。在该方法中，使用BPD可以抑制一些杂散信号，提高分辨率。双边带的使用提高了频谱利用率。同时，偏振控制器（PC）的偏振漂移和90° HC的相位偏移对DFS方向的判别影响很小。也就是说，所提出的DFS测量系统是稳定的。
A photonic approach to implement Doppler frequency shift (DFS) measurement and direction discrimination is proposed and demonstrated. In the proposed approach, a bidirectional PM and a Sagnac loop are used to obtain the orthogonally polarized optical signals. Combined with a wavelength division multiplexer (WDM), the upper and lower sidebands of the orthogonally polarized signals are separated. After two balanced photodetectors (BPDs), I/Q balanced detection is realized. Subsequently, the value and direction of DFS are estimated at the output ports of the electrical low-frequency 90° hybrid coupler (90° HC) simultaneously. In the proposed approach, using BPD can suppress some spurious signals and improve resolution. The use of double-sideband improves spectrum utilization. Meanwhile, the polarization drift of polarization controller (PC) and the phase offset of 90° HC have little influence on the discrimination of the DFS direction. That is to say, the proposed system for DFS measurement is stable.
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