基于光电振荡器的弱信号的频率探测的研究

发布时间：2018-01-06 07:35

本文关键词：基于光电振荡器的弱信号的频率探测的研究　出处：《北京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：现代电子战(EW)中,在复杂的环境中探测出弱信号的频率具有重要作用。基于电的微波测量方法测量带宽窄,不能满足现代电子战争的需求。微波光子技术和传统的电上的方法相比,具有大带宽、低损耗以及抗电磁干扰等优点。在噪声环境中探测射频信号频率的方法主要有：利用色散、窄带光滤波器,但是这些方法并没有对低功率的射频信号进行放大。 Preetpaul S. Devgan等提出了利用多模光电振荡器(OEO)进行探测和放大低功率的射频功率信号。多模光电振荡器和单模光电振荡器的区别主要是多模光电振荡器反馈回路没有电带通滤波器。由于单模光电振荡器回路中使用滤波器,其恢复的射频信号频率被限制在一定带宽范围内。另一方面,多模光电振荡器可以注入锁定任何和腔模振荡频率相匹配的注入信号频率。光电振荡器环路增益保持在临界值以下,当引入外部注入信号,满足振荡条件的频率会起振。这种多模光电振荡器会对外部注入信号选择性放大,即当注入信号频率接近振荡信号频率时,注入信号会被放大；当注入信号频率远离振荡信号频率时,注入信号会有损耗。为了探测更多频率的弱信号,该研究组还提出了基于双激光器多模光电探测器的弱信号探测方法,该方法通过切换两个激光器的开关切换两套振荡模式,然而这两套模式的切换复杂且昂贵。为了解决上述基于光电振荡器探测弱信号的问题,我们提出了基于调节调制器偏置点的弱信号探测方法,也是本文的主要创新点。通过调节MZ调制器的偏置点实现两套互补模式的切换,该频率切换方法可以实现快速切换而且花费低。通过实验验证,基于调节调制器偏置点的弱信号频率探测可以对注入的弱信号进行放大,探测精度高,灵敏度达到-78dBm,可探测信号的带宽为4-9GHz。
[Abstract]:In modern electronic warfare (EW), in a complex environment to detect the weak signal frequency plays an important role. Microwave measurement method of electricity measurement based on narrow band, can not meet the demand of modern electronic war. Compared with the microwave photonic technology and method of traditional electricity, with large bandwidth, low loss and anti electromagnetic interference etc. a method for detecting the frequency of the radio frequency signal in the noise environment are: using the dispersion, narrowband optical filter, but none of these methods on low power RF signal amplification.
Preetpaul S. Devgan is proposed by using multimode optoelectronic oscillator (OEO) RF power signal detection and amplification of low power. The difference between multimode and single mode optical optoelectronic oscillator oscillator is mainly multimode optoelectronic oscillator feedback loop power band-pass filter. Due to the use of filter single-mode optical electric oscillator circuit, the recovery of the RF signal frequency is limited in a certain range of bandwidth. On the other hand, multimode optoelectronic oscillator can be any injection locked and cavity oscillation frequency to match the injected signal frequency. Optoelectronic oscillator loop gain remains below the critical value, when the introduction of external signal injection, meet the condition of oscillation frequency will be exciting. This kind of multimode optoelectronic oscillator for external signal injection selective amplification, namely when the injected signal frequency is close to the frequency when the injected signal will be amplified when the injected signal frequency is far; From the frequency, the injected signal will be loss. In order to detect more weak signal frequency, the research group also proposed a detection method for weak signal pair of multimode laser photoelectric detector based on this method, through the switch switch two two sets of laser oscillation mode, while switching the two sets of model is complicated and expensive.
In order to solve the optoelectronic oscillator weak signal detection based on the problems, we put forward the adjustment of the modulator bias point of weak signal detection method based on the main innovation of this paper. The realization of the two switch is set by adjusting the bias point complementary mode MZ modulator, frequency switching method can realize fast switching and low cost. Through the experiment, the adjustment of the modulator bias point frequency of weak signal detection can amplify the weak signal injection based on high detection precision and sensitivity can reach -78dBm, the detection signal bandwidth of 4-9GHz.

【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN753.2;TN911.23

【共引文献】