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针对折叠结构萨尼亚克(Sagnac)光纤传感阵列存在噪声光与信号光混叠的问题,提出了一种主动相位偏置时分复用方案。在传统梯形结构传感阵列的基础上,通过调整总线光纤的长度关系和附加延迟光纤的方法,使噪声光和信号光依次交替返回而不会发生混叠。进一步分析表明,通过调整延迟光纤环的长度,可以使输入光脉冲的重复频率达到标准时分复用系统重复频率的二分之一。整个阵列的相位偏置由一个与输入光脉冲同步的相位调制信号驱动集成光学芯片实现。实验演示了一个两基元的传感阵列,最小时间间隔为331.25 ns,输入光脉冲重复频率可达754.727 kHz,在5 kHz处相位灵敏度为7.3μrad/Hz,探头间串扰约为-51.75 dB。
Aiming at the problem of the aliasing of noise light and signal light in the folded structure Sagnac fiber sensing array, an active phase offset time division multiplexing scheme is proposed. Based on the traditional trapezoidal sensor array, the noise and signal light are alternately returned without aliasing by adjusting the length relationship of the bus optical fiber and adding the method of delaying the optical fiber. Further analysis shows that by adjusting the length of the delay fiber loop, the repetition frequency of the input light pulse can reach one half of the repetition frequency of the standard time division multiplexing system. The phase offset of the entire array is achieved by driving an integrated optical chip with a phase-modulated signal that is synchronized with the input optical pulse. Experiments demonstrate a two-element sensing array with a minimum time interval of 331.25 ns, an input optical pulse repetition frequency of 754.727 kHz, a phase sensitivity of 7.3 μrad / Hz at 5 kHz and a crosstalk between probes of approximately -51.75 dB.