CAJ | 학술논문

马赫-曾德尔电光调制器的偏置点控制是光载射频传输链路中一项十分关键的技术。为了分析马赫-曾德尔电光调制器偏置点抖动控制对射频信号的影响，用贝塞尔级数展开再进行频谱分析的方法对系统输出信号成分进行了理论分析，设计了马赫-曾德尔调制器任意点控制系统并进行了实验验证。用MATLAB进行仿真后可知，在输入射频功率为18dBm时，抖动信号幅度需小于45mV，2次射频信号对抖动信号引起的频率分量抑制比才能大于20dB；而在输入射频功率为10dBm时，这个幅度要小于19mV。改变抖动信号幅度进行实验，得到2次射频信号对抖动信号引起的频率分量抑制比与仿真结果误差始终保持在3 dB～3.2 dB左右。结果表明，马赫-曾德尔电光调制器工作在线性偏置点时，抖动信号引起的频率分量是可以忽略的；但将调制器偏置控制在最低偏置点时，对射频信号的影响不可忽略。
마혁-증덕이전광조제기적편치점공제시광재사빈전수련로중일항십분관건적기술。위료분석마혁-증덕이전광조제기편치점두동공제대사빈신호적영향，용패새이급수전개재진행빈보분석적방법대계통수출신호성분진행료이론분석，설계료마혁-증덕이조제기임의점공제계통병진행료실험험증。용MATLAB진행방진후가지，재수입사빈공솔위18dBm시，두동신호폭도수소우45mV，2차사빈신호대두동신호인기적빈솔분량억제비재능대우20dB；이재수입사빈공솔위10dBm시，저개폭도요소우19mV。개변두동신호폭도진행실험，득도2차사빈신호대두동신호인기적빈솔분량억제비여방진결과오차시종보지재3 dB～3.2 dB좌우。결과표명，마혁-증덕이전광조제기공작재선성편치점시，두동신호인기적빈솔분량시가이홀략적；단장조제기편치공제재최저편치점시，대사빈신호적영향불가홀략。
Bias control of Mach-Zehnder electro-optic modulators ( EOM) is of great importance in radio over fiber links.In order to study the impact of dither tone-based modulator bias control on radio frequency ( RF) signal, the output signal component of the system was theoretically analyzed by means of spectrum analysis after it was turned into the Bessel series, a system for arbitrary bias point was designed to confirm the analysis experimentally .The results of MATLAB simulation show that when the input RF power is 18dBm, only when the amplitude of dither tone is smaller than 45mV, the suppression ratio of the second harmonic of RF signal to signal caused by dither tone can be greater than 20dB.When the input RF power is 10dBm, the amplitude should be smaller than 19mV accordingly.When the amplitude of dither tone changes, the error between the experimental data of the suppression ratio of the second harmonic of RF signal to signal caused by dither tone and the simulation results is maintained at about from 3dB to 3.2dB.The results demonstrate that when Mach-Zehnder EOM works at linear bias-point, frequency components caused by dither tone can be ignored , however, when Mach-Zehnder EOM works at smallest bias-point, the impact of dither tone cannot be ignored .