Time division multiplexing array of fiber laser hydrophone using optical switch
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摘要: 为了降低传感器系统的成本及体积,利用光纤激光传感单元的特性,采用光开关选通的光纤激光水听器时分复用技术,构建了实用的基于光开关的4元光纤激光水听器时分阵列。进行了理论分析和实验验证,分析了使用光开关选通的光纤激光水听器时分复用阵列方案的选通脉宽和损耗,指出了各通道光脉冲对干涉信号的采样率的限制因素。结果表明,光开关选通的光纤激光水听器时分阵列可以很好地完成复用信号的采集和复用,实验中4元时分复用水听器相邻通道的串扰为-17dB。Abstract: In order to reduce the cost and the size of a sensing system, a 4-element fiber laser hydrophone time division multiplexing array was established by using high-speed optical switches based on the characteristics of fiber laser sensing elements. The selective pulse width and the loss of the time division multiplexing array were analyzed after theoretical analysis and experimental verification. Because of time delay of the interferometer and switch speed of the optical switches, sampling frequency was limited. The acoustic detecting experiments show that the multiplexing signal can be acquired and demutiplexed correctly. The crosstalk between adjacent channels of the 4-element fiber laser hydrophone array is -17dB.
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Keywords:
- sensor technique /
- hydrophone array /
- time division multiplexing /
- optical switch /
- fiber laser
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