8路光纤水听器高速时分复用系统设计

System Design of An 8-element Fiber-optic Hydrophone Array Using High-speed Time Division Multiplexing

当前,光纤水听器阵列的多路复用技术已成为研究的重要课题之一,而时分复用(TDM)技术被认为是最简单有效的方案。本文详细介绍了8路光纤水听器高速时分复用系统的设计过程。分析比较了梯形式及平行式两种光路结构的优缺点,并得出最佳光路方案。选择TI公司生产的TMS320F206芯片作为系统控制核心,采用AD公司新出的采样频率达1 M的16位AD7677作为A/D转换器,设计出8路光纤水听器高速时分复用系统,测试结果表明系统通道间串扰在-30 dB左右。对水听器阵列时分复用技术的发展具有相当的参考价值和借鉴意义。

At present, the research of multiplexing technology of fiber-optic hydrophone array has become more important. Time division multiplexing (TDM) is considered as the simple and effective design for practical application. The design process of an 8-element hydrophone array using high-speed TDM was presented. The advantages and disadvantages of a parallel network and a ladder one were analyzed and compared, the best optic structure was described. An 8-element hydrophone array in a high-speed TDM reflectometric architecture was set up, a DSP TMS320F206 was chosen as the control kernel of the system and a 1 MSPS, 16-bit AD7677 was used as analog-to-digital converter. The result indicates that the level of TDM array sensor crosstalk is shown to be about-30 dB. It may be used as the basis and reference for the design and development of TDM fiber-optic hydrophone array.