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根据π相移光纤光栅的温度可调谐原理,使用半导体制冷器(TEC)和制冷片控制π相移光纤光栅的温度,从而改变其中心波长。随着温度升高,π相移光纤光栅的中心波长向长波方向线性漂移,温度从0℃变化到95℃时,中心波长从1548.921nm变化到1550.664nm,波长改变量为1.743nm,灵敏度约为18.35pm/℃。为了验证π相移光纤光栅温度调谐的特性,采用与其匹配的高反光纤光栅构成了C波段环形腔光纤激光振荡器,利用π相移光栅的窄带滤波特性实现了窄线宽激光输出,并通过控制π相移光栅的温度实现了输出激光波长的连续调谐。
According to the temperature tunable principle of π-phase shifted fiber gratings, the temperature of the π-phase shifted fiber gratings is controlled using a semiconductor cooler (TEC) and a cooling plate to change the center wavelength. With the increase of temperature, the center wavelength of π-phase shift FBG drifts linearly to the longwave direction. When the temperature changes from 0 ℃ to 95 ℃, the center wavelength changes from 1548.921nm to 1550.664nm, the wavelength change is 1.743nm, the sensitivity is about 18.35pm / ° C. In order to verify the temperature-tuning characteristics of π phase-shift fiber gratings, a C-band cavity fiber laser oscillator is constructed by using its matching high-anti-fiber grating. Narrow-band laser output is achieved by the narrow- Controlling the temperature of the π-phase shift grating enables continuous tuning of the output laser wavelength.