纳秒至毫秒级脉宽瞬态脉冲模拟光纤传输系统

Analog Fiber-optic Transmission System for Nanosecond-millisecond Width Pulse

纳秒至毫秒级脉宽瞬态脉冲模拟光纤传输系统采用半导体激光器直接调制原理,主要由高速分布反馈型(DFB)激光器和基于InGaAs的PIN型光电探测器及耦合电路、驱动电路、前置放大电路、直流滤除电路等组成。介绍了系统的工作原理,分析了被测信号与激光器的耦合、容性负载的驱动、直流成分的滤除等技术问题,并提出了相应的解决方法。系统-3 dB带宽为0.1 Hz^250 MHz,动态范围大于40 dB,噪声峰峰值小于10 mV。该系统可用于脉冲射线测量中。

An analog Fiber-optic Transmission System for nanosecond-millisecond width pulse is reported which is based on direct modulation of the semiconductor laser.The system is composed of a high speed DFB laser,an InGaAs PD,coupling circuits,driving circuits,pre-amplifier and DC filting circuits.The principle of the system is described.The problems in the process of developing system are discussed.The measured results indicate that-3dB bandwidth of the system is 0.1 Hz～250 MHz,the dynamic range is more than 40 dB within the nonlinearity of ±5 % and the peak-to-peak amplitude of output noise is less than 10 mV.The system can be used to transmit transient signals in measurement of pulse ray.