高超噪比宽带毫米波噪声信号光子学产生研究

受电子器件工作频率及功率的限制,传统电子学方法产生的噪声源的超噪比通常小于20 dB,针对这一问题,本文提出了一种基于非相干光拍频产生高超噪比宽带毫米波噪声技术.首先,用两个光滤波器对宽带放大自发辐射光源进行滤波整形.将获得的两束频率不同的放大自发辐射光耦合进入光电探测器进行拍频,从而产生电噪声信号.理论分析发现,通过...

Photonics generation of broadband millimeter wave noise signals with high excess noise ratios

The Excess Noise Ratio(ENR)of traditional noise sources is usually less than 20 dB due to the limitation of the working frequency and the power of electronic devices.To solve the problem,we propose a technology to generate a millimeter-wave noise source with a high ENR by two incoherent light beams beat-ing.First,two optical filters are used to filter and shape the broadband amplified spontaneous emission light source.Then,the two obtained beams of amplified spontaneous radiation light with different frequencies are coupled to the photodetector for the beat frequency,which can generate electrical noise signals.A theoretical analysis predicts that a noise source with an ENR larger than 50 dB can be obtained by adjusting the optical spectral,linewidth and optical power of the two incoherent light beams filtered from an amplified spontan-eous emission source under the current level of photodetector responsivity.A proof-of-concept experiment achieved a millimeter-wave noise source with an ENR higher than 50 dB.This method could also generate millimeter-wave and even terahertz-wave noise with a high ENR if a higher-speed photodetector was used.