基于光电振荡器结合电选频腔产生线性调频信号  

Linear Frequency-Modulated Signal Generation Based on Optoelectronic Oscillator Combined with Electrical Frequency-Selected Cavity

作　　者：刘莉 于晋龙 王菊 马闯 谢田元 于洋 方杰 彭海涛 Liu Li;Yu Jinlong;Wang Ju;Ma Chuang;Xie Tianyuan;Yu Yang;Fang jie;Peng Haitao(School of Electrical and Information Enghieering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072

出　　处：《激光与光电子学进展》2020年第3期227-233,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61427817,61775162)。

摘　　要：提出了一种基于光电振荡器结合电选频腔产生线性调频信号的方案,其中电选频腔由电放大器、电衰减器和移相器组成。通过调节电选频腔中移相器的偏置电压,利用光电振荡器输出信号与电选频腔输出信号间的频率牵引效应,能够产生中心频率为8.3GHz的线性调频信号,频率变化范围约为550MHz,调谐率约为5.5 MHz/μs,时间带宽积为5.5×10^4(带宽550MHz,持续时间100μs),其相位噪声由光电振荡器的相位噪声决定,其频率变化范围由移相器的偏置电压范围决定。与已有方法相比,该方案的系统结构较为简单,产生的线性调频信号具有较高的频谱纯度,相位噪声低至-116dBc/Hz@10kHz。A scheme of linear frequency-modulated signal generation based on optoelectronic oscillator combined with electrical frequency-selected cavity is proposed.The electrical frequency-selected cavity is composed of the electrical amplifier,attenuator,and phase shifter.By adjusting the bias voltage of the phase shifter in the electrical frequency-selected cavity and utilizing the frequency pulling effect between the output signal of optoelectronic oscillator and the output signal of electrical frequency-selected cavity,the linear frequency-modulated signal with a central frequency of 8.3 GHz can be produced,for which the frequency range is as large as 550 MHz,the tuning rate reaches about 5.5 MHz/μs,and the time-bandwidth product is up to 5.5×10^4(bandwidth 550 MHz,duration 100μs).Its phase noise depends on phase noise performance of the optoelectronic oscillator,and the frequency range depends on the bias voltage range of the phase shifter.Compared with current methods,the system structure is relatively simple.Linear frequency-modulated signal generated by this scheme has high spectral purity,and its low phase noise is-116 dBc/Hz@10 kHz.

关 键 词：光学器件 线性调频信号 光电振荡器 电注入锁定 频率牵引效应 

分 类 号：TN29[电子电信—物理电子学]