A broad-bandwidth analog optical fiber transmission system was developed for ultra-fast pulse signal transmission under the circumstance with complicated electromagnetic field. The ultra-fast pulse electric signal was converted to optical signal by means of electro-optic conversion. After several kilometers distance transmission, the optical signal was recovered by means of photo-electric conversion. The experimental measurement results of the system indicate that its bandwidth is ( 0.0003 ~ 3 ) GHz, in-band flatness is ± ldB, linear dynamic range is 40dB( 100 multiples), output peak-to-peak noise is less than 5mV, input standing-wave-ratio is less than 2. It' s applied in high power microwave experiments. The results show that the 3GHz analog optical fiber transmission system which employs electro-optic and photo-electric conversion technology is suitable for ultra-fast pulse signals transmission in radiation field diagnosis.%为了在复杂电磁环境下远距离传输超快脉冲电信号,采用电光转换法将超快脉冲电信号转化为光信号,光信号经数公里光纤传输,在光纤末端采用光电转换法恢复超快脉冲电信号,成功研制了宽频带模拟光纤传输系统.系统的性能指标频带宽度为(0.0003～3)GHz,带内平坦度为±1dB,线性动态范围为40dB(100倍),输出噪声峰峰值小于5mV,驻波比优于2；该传输系统可应用于高功率微波实验.结果表明,采用电光转换和光电转换技术的模拟光纤传输系统可用于超快脉冲诊断中的信号传输.
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