【摘要】：在基于外差方案的干涉型光纖檢波器中,正交載波的獲取是其中的一個重要環(huán)節(jié)。諧波失真和相對幅度誤差是評價解調(diào)信號質(zhì)量的重要指標(biāo),正交載波之間存在的相位偏差會導(dǎo)致解調(diào)信號的諧波失真和相對幅度誤差增大。分析了正交載波的相位偏差與解調(diào)結(jié)果的諧波失真、相對幅度誤差之間的關(guān)系,運用級數(shù)分解和貝塞爾函數(shù)展開式進(jìn)行數(shù)學(xué)推導(dǎo),并進(jìn)行了仿真驗證。分析結(jié)果表明,正交載波的相位偏差與諧波失真/相對幅度誤差呈正相關(guān),當(dāng)要求諧波失真優(yōu)于-40dB、相對幅度誤差小于1%時,需要控制相位偏差在1.6×10-2 rad以下。最后搭建了實驗測試系統(tǒng),實驗結(jié)果驗證了理論的正確性。
[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.
【作者單位】： 清華大學(xué)電子工程系;中國船舶工業(yè)系統(tǒng)工程研究院;北京大學(xué)海洋研究院;
【基金】：國家自然科學(xué)基金(61327812)
【分類號】：TP212
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本文編號：2327514