光纤光栅应变时特性的研究

Experimental study on strain effect of chirped FBG

研究光栅的中心波长、带宽、时延在外界应力作用发生的变化 ,实验中发现光栅的中心波长、带宽随应力改变而线性变化 ,时延的线性度在光栅拉伸时变得更好 ,时延波动 (Delay ripple)减小 ,补偿量也减小 。

Based on the experimental studies on the strain effect of fiber Bragg grating (FBG) wavelength, the 3 dB band, reflectivity and the characterization of delay, the change of wavelength and 3 dB band is linear with the strain, but the reflectivity decreases when the strain increases. The linearity of delay become better, the root mean square deviation of delay ripple reduces and the compensation lessens when the strain increases.