基于色散效应的光纤光栅高速高精度解调方法研究

发布时间：2018-05-23 11:08

  本文选题：光纤传感 + 普通单模光纤　； 参考：《物理学报》2017年01期

【摘要】：利用普通单模光纤(SMF)与色散补偿光纤(DCF)分别具有正色散和负色散系数特性,实现光纤光栅阵列的高速高精度解调.系统采用全光纤结构,仅需发出单一高速光脉冲,即可根据反射光脉冲时延差同时获取各个光栅的波长与位置信息,大幅提高了光纤光栅解调速度;通过建立DCF-SMF双通道和色散差矫正模型,削弱了温度变化及色散值误差对系统解调精度的影响.实验表明,本方法解调速率可达1 MHz,解调过程受传感网络光纤及双通道温变影响较小,具有良好稳定性及高精度;5—75?C温度扰动实验中,传感网络传输光纤温变时系统解调均方差16.8 pm,DCF-SMF双通道受温度扰动时系统解调均方差为11.9 pm,恒温下系统长时间解调时均方差为6.4 pm;应力实验中,解调线性度可达0.9998,解调精度约为8.5 pm.
[Abstract]:The high speed and high precision demodulation of fiber Bragg grating arrays is realized by using common single-mode fiber (SMF) and dispersion-compensated fiber (DCF) with positive dispersion and negative dispersion coefficient respectively. The system adopts all-fiber structure, only needs to send out a single high-speed optical pulse, can simultaneously obtain the wavelength and position information of each grating according to the time delay difference of reflected light pulse, which greatly improves the demodulation speed of fiber grating. The influence of temperature variation and dispersion error on the demodulation accuracy of the system is weakened by establishing the DCF-SMF dual-channel and dispersion correction model. The experimental results show that the demodulation rate of this method can reach 1 MHz, and the demodulation process is less affected by the temperature variation of optical fiber and dual channels in the sensor network, and has good stability and high precision in the experiment of temperature disturbance of 5-75 鈩，

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