基于光偏振调制器产生亚毫米波的研究

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亚毫米波源是亚毫米波应用的最重要的器件之一,电域中产生亚毫米波信号的成本十分昂贵.光生亚毫米波信号可极大地降低成本,是目前国内外研究的热点课题.提出了一种采用两组并行光偏振调制器级联产生32倍频亚毫米波的方案,首先用两个由4个偏振调制器并联构成的子系统级联产生主要保留载波和±16阶边带的光信号,同时利用光移相器和光分束器抑制载波,最后通过合成光信号在光电探测器上的拍频,获得32倍频亚毫米波信号.理论分析了产生32倍频亚毫米波信号的原理,推导出±16阶边带信号的光边带抑制比为55.7 dB,32倍频亚毫米波信号的射频杂散抑制比为43.7 dB.采用光子模拟软件,设计了一个基于上述原理产生32倍频亚毫米波的系统,获得了光边带抑制比为54 dB,射频杂散抑制比为43 dB,与理论分析吻合.同时分析了相移量、调制指数和分光比偏离对抑制比的影响.
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