载波相位偏差对光纤检波器解调的影响
发布时间：2018-11-12 15:31
【摘要】：在基于外差方案的干涉型光纤检波器中,正交载波的获取是其中的一个重要环节。谐波失真和相对幅度误差是评价解调信号质量的重要指标,正交载波之间存在的相位偏差会导致解调信号的谐波失真和相对幅度误差增大。分析了正交载波的相位偏差与解调结果的谐波失真、相对幅度误差之间的关系,运用级数分解和贝塞尔函数展开式进行数学推导,并进行了仿真验证。分析结果表明,正交载波的相位偏差与谐波失真/相对幅度误差呈正相关,当要求谐波失真优于-40dB、相对幅度误差小于1%时,需要控制相位偏差在1.6×10-2 rad以下。最后搭建了实验测试系统,实验结果验证了理论的正确性。
[Abstract]:In the interferometric optical fiber detector based on heterodyne scheme, the acquisition of orthogonal carrier is an important part. Harmonic distortion and relative amplitude error are important indexes to evaluate the quality of demodulated signal. The phase deviation between orthogonal carriers will lead to the increase of harmonic distortion and relative amplitude error of demodulated signal. The relationship between the phase deviation of the orthogonal carrier and the harmonic distortion and the relative amplitude error of the demodulation result is analyzed. The mathematical derivation is carried out by using the series decomposition and the Bessel function expansion, and the simulation results are verified. The results show that the phase deviation of the orthogonal carrier is positively correlated with the harmonic distortion / relative amplitude error. When the harmonic distortion is better than -40 dB and the relative amplitude error is less than 1, the phase deviation should be controlled below 1.6 脳 10 ~ (-2) rad. Finally, the experimental test system is built, and the experimental results verify the correctness of the theory.
【作者单位】： 清华大学电子工程系;中国船舶工业系统工程研究院;北京大学海洋研究院;
【基金】：国家自然科学基金(61327812)
【分类号】：TP212
，
本文编号：2327514
[Abstract]:In the interferometric optical fiber detector based on heterodyne scheme, the acquisition of orthogonal carrier is an important part. Harmonic distortion and relative amplitude error are important indexes to evaluate the quality of demodulated signal. The phase deviation between orthogonal carriers will lead to the increase of harmonic distortion and relative amplitude error of demodulated signal. The relationship between the phase deviation of the orthogonal carrier and the harmonic distortion and the relative amplitude error of the demodulation result is analyzed. The mathematical derivation is carried out by using the series decomposition and the Bessel function expansion, and the simulation results are verified. The results show that the phase deviation of the orthogonal carrier is positively correlated with the harmonic distortion / relative amplitude error. When the harmonic distortion is better than -40 dB and the relative amplitude error is less than 1, the phase deviation should be controlled below 1.6 脳 10 ~ (-2) rad. Finally, the experimental test system is built, and the experimental results verify the correctness of the theory.
【作者单位】： 清华大学电子工程系;中国船舶工业系统工程研究院;北京大学海洋研究院;
【基金】：国家自然科学基金(61327812)
【分类号】：TP212
，
本文编号：2327514
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